v3.26.1
Loans and Allowance for Credit Losses - Schedule of Internal Risk-rating Categories (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year $ 485,347   $ 2,588,601
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 2,493,759   1,666,535
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,591,764   1,950,391
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 1,801,721   4,567,362
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 4,371,033   3,380,031
Prior 9,494,890   6,426,417
Revolving Loans 2,671,367   2,474,558
Revolving Loans Converted to Term Loans 14,163   31,170
Total 22,924,044   23,085,065
Current period gross charge-offs      
Total 12,918 $ 12,487  
Commercial and industrial | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 191,100   840,472
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 749,555   323,942
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 297,575   343,999
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 317,540   445,802
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 438,894   382,742
Prior 1,472,954   1,098,889
Revolving Loans 878,994   859,691
Revolving Loans Converted to Term Loans 0   165
Total 4,346,612   4,295,702
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 6,500    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 0    
Prior 0    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 6,500 0  
Commercial and industrial | Pass | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 191,100   835,431
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 744,921   310,569
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 295,320   296,116
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 268,393   422,850
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 415,726   378,622
Prior 1,450,258   1,090,152
Revolving Loans 781,734   792,359
Revolving Loans Converted to Term Loans 0   165
Total 4,147,452   4,126,264
Commercial and industrial | Special Mention | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   948
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 602   2,399
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 2,237   6,716
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 6,425   133
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,331   1,314
Prior 3,492   2,795
Revolving Loans 26,925   12,990
Revolving Loans Converted to Term Loans 0   0
Total 41,012   27,295
Commercial and industrial | Substandard | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   4,093
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 4,032   10,974
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 18   31,539
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 39,594   22,819
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 21,019   2,806
Prior 19,196   4,893
Revolving Loans 70,335   53,495
Revolving Loans Converted to Term Loans 0   0
Total 154,194   130,619
Commercial and industrial | Doubtful | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   9,628
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 3,128   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 818   0
Prior 8   1,049
Revolving Loans 0   847
Revolving Loans Converted to Term Loans 0   0
Total 3,954   11,524
Commercial and industrial | Loss | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Commercial real estate | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 186,085   917,338
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 933,386   616,938
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 611,068   856,717
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 809,228   2,466,870
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 2,427,721   1,391,737
Prior 4,317,044   3,059,004
Revolving Loans 87,152   103,010
Revolving Loans Converted to Term Loans 1,792   2,747
Total 9,373,476   9,414,361
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 2,088    
Prior 1,500    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 3,588 11,587  
Commercial real estate | Pass | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 186,085   903,311
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 919,258   616,073
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 610,246   750,447
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 720,709   2,297,477
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 2,245,884   1,285,420
Prior 4,056,208   2,892,767
Revolving Loans 87,152   102,016
Revolving Loans Converted to Term Loans 804   2,747
Total 8,826,346   8,850,258
Commercial real estate | Special Mention | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   865
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 822   30,585
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 30,574   28,104
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 38,493   90,528
Prior 158,299   73,987
Revolving Loans 0   994
Revolving Loans Converted to Term Loans 988   0
Total 229,176   225,063
Commercial real estate | Substandard | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   14,027
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 14,128   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   54,833
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 54,775   85,591
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 77,282   13,408
Prior 79,633   65,778
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 225,818   233,637
Commercial real estate | Doubtful | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   20,852
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 3,170   55,698
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 66,062   2,381
Prior 22,904   26,472
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 92,136   105,403
Commercial real estate | Loss | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Commercial construction | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 6,947   134,110
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 163,468   209,616
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 219,723   103,355
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 85,518   90,800
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 22,237   14,263
Prior 0   2,191
Revolving Loans 4,144   9,150
Revolving Loans Converted to Term Loans 0   0
Total 502,037   563,485
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 0    
Prior 0    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 0 0  
Commercial construction | Pass | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 6,947   134,110
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 163,468   209,193
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 212,789   103,355
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 85,518   65,595
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 14,072   14,263
Prior 0   712
Revolving Loans 4,144   8,117
Revolving Loans Converted to Term Loans 0   0
Total 486,938   535,345
Commercial construction | Special Mention | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   423
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   4,671
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   1,033
Revolving Loans Converted to Term Loans 0   0
Total 0   6,127
Commercial construction | Substandard | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 6,934   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   5,646
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 8,165   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 15,099   5,646
Commercial construction | Doubtful | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   14,888
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   1,479
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   16,367
Commercial construction | Loss | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Business banking | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 29,222   184,492
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 178,731   184,702
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 177,600   145,014
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 137,584   184,108
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 165,978   217,139
Prior 728,677   556,909
Revolving Loans 116,759   114,793
Revolving Loans Converted to Term Loans 2,287   6,537
Total 1,536,838   1,593,694
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 148    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 246    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 225    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 94    
Prior 1,460    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 41    
Total 2,214 342  
Business banking | Pass | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 29,222   182,967
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 177,798   175,785
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 167,396   139,676
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 131,694   180,091
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 162,443   210,893
Prior 711,161   549,839
Revolving Loans 115,578   114,235
Revolving Loans Converted to Term Loans 2,287   5,762
Total 1,497,579   1,559,248
Business banking | Special Mention | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   5,505
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 4,635   1,444
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 675   820
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 497   4,453
Prior 9,066   3,298
Revolving Loans 1,164   165
Revolving Loans Converted to Term Loans 0   264
Total 16,037   15,949
Business banking | Substandard | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   1,525
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 933   3,412
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 5,466   3,482
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 5,197   2,845
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 3,038   1,765
Prior 7,014   3,769
Revolving Loans 17   197
Revolving Loans Converted to Term Loans 0   493
Total 21,665   17,488
Business banking | Doubtful | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 103   412
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 18   352
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   28
Prior 1,436   3
Revolving Loans 0   196
Revolving Loans Converted to Term Loans 0   18
Total 1,557   1,009
Business banking | Loss | Commercial Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Residential real estate | Residential Real Estate      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 62,320   434,642
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 425,497   241,893
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 231,141   397,604
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 381,590   1,254,357
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,237,068   1,331,022
Prior 2,850,428   1,572,662
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 5,188,044   5,232,180
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 0    
Prior 0    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 0 0  
Residential real estate | Residential Real Estate | Current and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 62,320   433,413
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 424,951   239,268
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 229,518   394,753
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 373,382   1,242,550
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,218,883   1,323,273
Prior 2,809,981   1,544,328
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 5,119,035   5,177,585
Residential real estate | Residential Real Estate | 30-89 days past due and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   1,045
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 363   2,625
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,379   2,130
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 7,389   6,121
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 13,266   5,801
Prior 24,673   17,654
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 47,070   35,376
Residential real estate | Residential Real Estate | Loans 90 days or more past due and still accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Residential real estate | Residential Real Estate | Non-accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   184
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 183   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 244   721
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 819   5,686
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 4,919   1,948
Prior 15,774   10,680
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 21,939   19,219
Consumer home equity | Consumer Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   33,188
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 7,204   43,233
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 11,370   53,754
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 24,001   104,668
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 60,461   31,698
Prior 102,700   120,738
Revolving Loans 1,545,755   1,345,018
Revolving Loans Converted to Term Loans 10,082   21,313
Total 1,761,573   1,753,610
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 0    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 0    
Prior 4    
Revolving Loans 0    
Revolving Loans Converted to Term Loans 0    
Total 4 0  
Consumer home equity | Consumer Portfolio Segment | Current and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   32,940
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 7,204   43,175
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 11,265   53,426
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 23,845   104,417
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 60,293   31,698
Prior 99,974   117,896
Revolving Loans 1,532,713   1,332,194
Revolving Loans Converted to Term Loans 9,949   20,341
Total 1,745,243   1,736,087
Consumer home equity | Consumer Portfolio Segment | 30-89 days past due and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   248
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   58
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 105   233
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 156   251
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 168   0
Prior 987   1,716
Revolving Loans 9,018   8,269
Revolving Loans Converted to Term Loans 60   655
Total 10,494   11,430
Consumer home equity | Consumer Portfolio Segment | Loans 90 days or more past due and still accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Consumer home equity | Consumer Portfolio Segment | Non-accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   95
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 1,739   1,126
Revolving Loans 4,024   4,555
Revolving Loans Converted to Term Loans 73   317
Total 5,836   6,093
Other Consumer | Consumer Portfolio Segment      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 9,673   44,359
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 35,918   46,211
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 43,287   49,948
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 46,260   20,757
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 18,674   11,430
Prior 23,087   16,024
Revolving Loans 38,563   42,896
Revolving Loans Converted to Term Loans 2   408
Total 215,464   232,033
Current period gross charge-offs      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 268    
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 45    
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 77    
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 20    
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 40    
Prior 76    
Revolving Loans 86    
Revolving Loans Converted to Term Loans 0    
Total 612 $ 558  
Other Consumer | Consumer Portfolio Segment | Current and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 9,673   44,301
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 35,816   46,109
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 43,146   49,860
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 46,150   20,675
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 18,582   11,399
Prior 23,059   15,976
Revolving Loans 38,240   42,750
Revolving Loans Converted to Term Loans 2   117
Total 214,668   231,187
Other Consumer | Consumer Portfolio Segment | 30-89 days past due and accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   10
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 82   98
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 106   75
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 103   52
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 82   31
Prior 28   36
Revolving Loans 280   62
Revolving Loans Converted to Term Loans 0   30
Total 681   394
Other Consumer | Consumer Portfolio Segment | Loans 90 days or more past due and still accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Prior 0   0
Revolving Loans 0   0
Revolving Loans Converted to Term Loans 0   0
Total 0   0
Other Consumer | Consumer Portfolio Segment | Non-accrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   48
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 20   4
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 35   13
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 7   30
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 10   0
Prior 0   12
Revolving Loans 43   84
Revolving Loans Converted to Term Loans 0   261
Total $ 115   $ 452