v3.26.1
Loans - Schedule of Amortized Costs by Segment of Loans by Risk Category and Origination Date (Details) - USD ($)
$ in Thousands
3 Months Ended 12 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]      
Current fiscal year $ 320,154   $ 1,253,253
Year before current fiscal year 1,225,527   708,484
Two years before current fiscal year 659,509   540,469
Three years before current year 515,336   1,099,017
Four years before current fiscal year 1,052,593   556,535
Prior 1,642,780   1,167,618
Revolving Loans Converted to Term 136,420   174,929
Revolving 1,387,653   1,172,875
Total 6,939,972   6,673,180
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   991
Two years before current fiscal year, writeoffs 0   1,782
Three years before current year, writeoffs 7,072   16,734
Four years before current fiscal year, writeoffs 0   125
Prior 198   4,782
Revolving Loans Converted to Term 3,372   2,974
Revolving 6   1,598
Total 10,648 $ 812 28,986
Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 319,716   1,242,545
Year before current fiscal year 1,211,341   649,368
Two years before current fiscal year 600,651   460,472
Three years before current year 438,017   955,480
Four years before current fiscal year 914,772   493,700
Prior 1,518,028   1,096,090
Revolving Loans Converted to Term 115,334   131,169
Revolving 1,315,312   1,122,056
Total 6,433,171   6,150,880
Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 438   7,542
Year before current fiscal year 11,186   29,968
Two years before current fiscal year 26,489   14,733
Three years before current year 18,997   53,401
Four years before current fiscal year 55,100   41,863
Prior 57,071   35,901
Revolving Loans Converted to Term 4,385   4,069
Revolving 36,851   23,092
Total 210,517   210,569
Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,644
Year before current fiscal year 943   28,580
Two years before current fiscal year 29,409   30,343
Three years before current year 20,854   55,318
Four years before current fiscal year 37,349   5,141
Prior 21,044   6,141
Revolving Loans Converted to Term 15,068   17,330
Revolving 18,963   14,443
Total 143,630   158,940
Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,522
Year before current fiscal year 1,628   0
Two years before current fiscal year 46   34,416
Three years before current year 21,275   10,397
Four years before current fiscal year 30,102   13,964
Prior 23,470   14,227
Revolving Loans Converted to Term 1,027   5,571
Revolving 15,745   12,613
Total 93,293   92,710
Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 429   568
Two years before current fiscal year 2,914   505
Three years before current year 581   23,462
Four years before current fiscal year 14,311   1,867
Prior 23,167   15,259
Revolving Loans Converted to Term 256   16,790
Revolving 149   262
Total 41,807   58,713
Doubtful      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 15,612   959
Four years before current fiscal year 959   0
Prior 0   0
Revolving Loans Converted to Term 350   0
Revolving 633   409
Total 17,554   1,368
Commercial and industrial      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 183,690   743,751
Year before current fiscal year 703,087   339,595
Two years before current fiscal year 305,128   226,283
Three years before current year 212,601   220,408
Four years before current fiscal year 192,763   141,239
Prior 221,746   90,923
Revolving Loans Converted to Term 57,772   98,816
Revolving 1,283,990   1,076,852
Total 3,160,777   2,937,867
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   983
Two years before current fiscal year, writeoffs 0   1,765
Three years before current year, writeoffs 7,072   16,676
Four years before current fiscal year, writeoffs 0   83
Prior 140   1,846
Revolving Loans Converted to Term 3,372   2,973
Revolving 0   1,474
Total 10,584   25,800
Commercial and industrial | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 183,400   740,012
Year before current fiscal year 695,020   298,940
Two years before current fiscal year 265,228   169,246
Three years before current year 160,073   149,909
Four years before current fiscal year 140,150   121,886
Prior 184,667   80,362
Revolving Loans Converted to Term 38,590   57,063
Revolving 1,224,930   1,039,368
Total 2,892,058   2,656,786
Commercial and industrial | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 290   2,217
Year before current fiscal year 6,439   26,707
Two years before current fiscal year 24,990   11,607
Three years before current year 15,253   26,316
Four years before current fiscal year 17,573   1,005
Prior 9,972   2,868
Revolving Loans Converted to Term 2,590   2,195
Revolving 23,595   9,782
Total 100,702   82,697
Commercial and industrial | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   13,948
Two years before current fiscal year 14,864   20,570
Three years before current year 11,143   23,243
Four years before current fiscal year 3,979   3,338
Prior 5,628   295
Revolving Loans Converted to Term 15,068   17,330
Revolving 18,962   14,443
Total 69,644   93,167
Commercial and industrial | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,522
Year before current fiscal year 1,628   0
Two years before current fiscal year 46   24,860
Three years before current year 10,520   9,031
Four years before current fiscal year 30,102   13,523
Prior 11,061   4,387
Revolving Loans Converted to Term 1,027   5,571
Revolving 15,745   12,613
Total 70,129   71,507
Commercial and industrial | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   10,950
Four years before current fiscal year 0   1,487
Prior 10,418   3,011
Revolving Loans Converted to Term 147   16,657
Revolving 125   237
Total 10,690   32,342
Commercial and industrial | Doubtful      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 15,612   959
Four years before current fiscal year 959   0
Prior 0   0
Revolving Loans Converted to Term 350   0
Revolving 633   409
Total 17,554   1,368
Commercial Real Estate      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 98,939   331,052
Year before current fiscal year 344,538   192,766
Two years before current fiscal year 193,795   208,676
Three years before current year 201,664   348,134
Four years before current fiscal year 338,363   253,075
Prior 671,632   469,006
Revolving Loans Converted to Term 75,322   73,555
Revolving 57,476   45,532
Total 1,981,729   1,921,796
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   0
Commercial Real Estate | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 98,939   330,002
Year before current fiscal year 342,319   177,567
Two years before current fiscal year 178,473   189,177
Three years before current year 181,033   294,706
Four years before current fiscal year 275,118   216,633
Prior 604,160   423,278
Revolving Loans Converted to Term 73,565   71,796
Revolving 47,367   35,370
Total 1,800,974   1,738,529
Commercial Real Estate | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,050
Year before current fiscal year 1,790   998
Two years before current fiscal year 998   558
Three years before current year 553   20,613
Four years before current fiscal year 31,944   34,198
Prior 36,067   25,075
Revolving Loans Converted to Term 1,757   1,759
Revolving 10,109   10,162
Total 83,218   94,413
Commercial Real Estate | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   14,201
Two years before current fiscal year 14,113   9,385
Three years before current year 9,323   31,449
Four years before current fiscal year 31,301   1,803
Prior 13,409   5,663
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 68,146   62,501
Commercial Real Estate | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   9,556
Three years before current year 10,755   1,366
Four years before current fiscal year 0   441
Prior 12,366   9,791
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 23,121   21,154
Commercial Real Estate | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 429   0
Two years before current fiscal year 211   0
Three years before current year 0   0
Four years before current fiscal year 0   0
Prior 5,630   5,199
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 6,270   5,199
Commercial Real Estate | Non-owner occupied      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 50,871   161,082
Year before current fiscal year 162,362   38,766
Two years before current fiscal year 38,554   58,184
Three years before current year 62,889   110,562
Four years before current fiscal year 108,894   132,114
Prior 306,695   202,110
Revolving Loans Converted to Term 9,653   9,375
Revolving 38,860   29,809
Total 778,778   742,002
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   0
Commercial Real Estate | Non-owner occupied | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 50,871   161,082
Year before current fiscal year 161,625   38,766
Two years before current fiscal year 38,554   58,184
Three years before current year 62,889   100,232
Four years before current fiscal year 87,343   103,191
Prior 273,693   190,446
Revolving Loans Converted to Term 7,896   7,616
Revolving 28,751   19,647
Total 711,622   679,164
Commercial Real Estate | Non-owner occupied | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 737   0
Two years before current fiscal year 0   0
Three years before current year 0   8,964
Four years before current fiscal year 21,551   28,923
Prior 20,510   7,023
Revolving Loans Converted to Term 1,757   1,759
Revolving 10,109   10,162
Total 54,664   56,831
Commercial Real Estate | Non-owner occupied | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   0
Prior 7,891   246
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 7,891   246
Commercial Real Estate | Non-owner occupied | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   1,366
Four years before current fiscal year 0   0
Prior 456   214
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 456   1,580
Commercial Real Estate | Non-owner occupied | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   0
Prior 4,145   4,181
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 4,145   4,181
Commercial Real Estate | Owner occupied      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 16,450   101,496
Year before current fiscal year 100,218   100,877
Two years before current fiscal year 100,074   82,134
Three years before current year 81,523   52,387
Four years before current fiscal year 53,445   83,368
Prior 302,920   240,522
Revolving Loans Converted to Term 34,368   34,639
Revolving 5,192   5,351
Total 694,190   700,774
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   0
Commercial Real Estate | Owner occupied | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 16,450   101,496
Year before current fiscal year 100,218   88,319
Two years before current fiscal year 87,564   70,010
Three years before current year 68,230   37,308
Four years before current fiscal year 44,031   77,652
Prior 271,113   207,336
Revolving Loans Converted to Term 34,368   34,639
Revolving 5,192   5,351
Total 627,166   622,111
Commercial Real Estate | Owner occupied | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   93
Two years before current fiscal year 93   558
Three years before current year 553   8,403
Four years before current fiscal year 2,761   5,275
Prior 15,557   17,174
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 18,964   31,503
Commercial Real Estate | Owner occupied | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   12,465
Two years before current fiscal year 12,417   2,010
Three years before current year 1,985   6,676
Four years before current fiscal year 6,653   0
Prior 3,731   5,417
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 24,786   26,568
Commercial Real Estate | Owner occupied | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   9,556
Three years before current year 10,755   0
Four years before current fiscal year 0   441
Prior 11,034   9,577
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 21,789   19,574
Commercial Real Estate | Owner occupied | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   0
Prior 1,485   1,018
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 1,485   1,018
Commercial Real Estate | Construction and land      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 16,254   33,241
Year before current fiscal year 47,226   48,666
Two years before current fiscal year 50,852   67,049
Three years before current year 55,951   76,145
Four years before current fiscal year 61,425   6,319
Prior 14,784   7,779
Revolving Loans Converted to Term 20,865   19,081
Revolving 13,424   10,372
Total 280,781   268,652
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   0
Commercial Real Estate | Construction and land | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 16,254   32,191
Year before current fiscal year 45,744   46,025
Two years before current fiscal year 48,040   59,674
Three years before current year 48,613   48,126
Four years before current fiscal year 29,145   6,319
Prior 14,784   7,779
Revolving Loans Converted to Term 20,865   19,081
Revolving 13,424   10,372
Total 236,869   229,567
Commercial Real Estate | Construction and land | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,050
Year before current fiscal year 1,053   905
Two years before current fiscal year 905   0
Three years before current year 0   3,246
Four years before current fiscal year 7,632   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 9,590   5,201
Commercial Real Estate | Construction and land | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   1,736
Two years before current fiscal year 1,696   7,375
Three years before current year 7,338   24,773
Four years before current fiscal year 24,648   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 33,682   33,884
Commercial Real Estate | Construction and land | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0    
Year before current fiscal year 429    
Two years before current fiscal year 211    
Three years before current year 0    
Four years before current fiscal year 0    
Prior 0    
Revolving Loans Converted to Term 0    
Revolving 0    
Total 640    
Commercial Real Estate | Multifamily      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 15,364   35,233
Year before current fiscal year 34,732   4,457
Two years before current fiscal year 4,315   1,309
Three years before current year 1,301   109,040
Four years before current fiscal year 114,599   31,274
Prior 47,233   18,595
Revolving Loans Converted to Term 10,436   10,460
Revolving 0   0
Total 227,980   210,368
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   0
Commercial Real Estate | Multifamily | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 15,364   35,233
Year before current fiscal year 34,732   4,457
Two years before current fiscal year 4,315   1,309
Three years before current year 1,301   109,040
Four years before current fiscal year 114,599   29,471
Prior 44,570   17,717
Revolving Loans Converted to Term 10,436   10,460
Revolving 0   0
Total 225,317   207,687
Commercial Real Estate | Multifamily | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year     0
Year before current fiscal year     0
Two years before current fiscal year     0
Three years before current year     0
Four years before current fiscal year     0
Prior     878
Revolving Loans Converted to Term     0
Revolving     0
Total     878
Commercial Real Estate | Multifamily | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   1,803
Prior 1,787   0
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 1,787   1,803
Commercial Real Estate | Multifamily | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0    
Year before current fiscal year 0    
Two years before current fiscal year 0    
Three years before current year 0    
Four years before current fiscal year 0    
Prior 876    
Revolving Loans Converted to Term 0    
Revolving 0    
Total 876    
Residential real estate      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 36,779   157,570
Year before current fiscal year 158,021   138,588
Two years before current fiscal year 123,215   103,674
Three years before current year 99,431   522,390
Four years before current fiscal year 513,490   107,939
Prior 269,157   172,299
Revolving Loans Converted to Term 2,339   2,347
Revolving 14,378   16,279
Total 1,216,810   1,221,086
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   74
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   74
Residential real estate | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 36,779   151,678
Year before current fiscal year 154,147   135,326
Two years before current fiscal year 119,579   100,216
Three years before current year 95,273   502,785
Four years before current fiscal year 491,532   101,673
Prior 249,614   157,612
Revolving Loans Converted to Term 2,195   2,160
Revolving 14,354   16,254
Total 1,163,473   1,167,704
Residential real estate | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   4,248
Year before current fiscal year 2,931   2,263
Two years before current fiscal year 501   2,565
Three years before current year 3,189   6,467
Four years before current fiscal year 5,578   5,888
Prior 10,417   7,450
Revolving Loans Converted to Term 35   54
Revolving 0   0
Total 22,651   28,935
Residential real estate | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   1,644
Year before current fiscal year 943   431
Two years before current fiscal year 432   388
Three years before current year 388   626
Four years before current fiscal year 2,069   0
Prior 2,007   183
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 5,839   3,272
Residential real estate | Substandard - Accruing      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   0
Prior 43   49
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 43   49
Residential real estate | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   568
Two years before current fiscal year 2,703   505
Three years before current year 581   12,512
Four years before current fiscal year 14,311   378
Prior 7,076   7,005
Revolving Loans Converted to Term 109   133
Revolving 24   25
Total 24,804   21,126
Public Finance      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   6,725
Year before current fiscal year 6,723   30,469
Two years before current fiscal year 30,460   1,066
Three years before current year 1,067   0
Four years before current fiscal year 0   41,450
Prior 454,102   418,758
Revolving Loans Converted to Term 0   0
Revolving 2,187   3,114
Total 494,539   501,582
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   1,922
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   1,922
Public Finance | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   6,725
Year before current fiscal year 6,723   30,469
Two years before current fiscal year 30,460   1,066
Three years before current year 1,067   0
Four years before current fiscal year 0   41,450
Prior 454,102   418,758
Revolving Loans Converted to Term 0   0
Revolving 2,187   3,114
Total 494,539   501,582
Consumer      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 746   2,496
Year before current fiscal year 2,156   2,121
Two years before current fiscal year 1,773   770
Three years before current year 573   764
Four years before current fiscal year 663   3,032
Prior 12,059   10,087
Revolving Loans Converted to Term 987   211
Revolving 12,918   13,170
Total 31,875   32,651
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   8
Two years before current fiscal year, writeoffs 0   17
Three years before current year, writeoffs 0   58
Four years before current fiscal year, writeoffs 0   42
Prior 58   197
Revolving Loans Converted to Term 0   1
Revolving 6   124
Total 64   447
Consumer | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 598   2,469
Year before current fiscal year 2,130   2,121
Two years before current fiscal year 1,773   767
Three years before current year 571   759
Four years before current fiscal year 658   2,930
Prior 11,401   9,535
Revolving Loans Converted to Term 984   150
Revolving 12,773   13,026
Total 30,888   31,757
Consumer | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 148   27
Year before current fiscal year 26   0
Two years before current fiscal year 0   3
Three years before current year 2   5
Four years before current fiscal year 5   100
Prior 615   508
Revolving Loans Converted to Term 3   61
Revolving 144   144
Total 943   848
Consumer | Special Mention      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0    
Year before current fiscal year 0    
Two years before current fiscal year 0    
Three years before current year 0    
Four years before current fiscal year 0    
Prior 0    
Revolving Loans Converted to Term 0    
Revolving 1    
Total 1    
Consumer | Substandard - Nonaccrual      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   2
Prior 43   44
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 43   46
Other      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   11,659
Year before current fiscal year 11,002   4,945
Two years before current fiscal year 5,138   0
Three years before current year 0   7,321
Four years before current fiscal year 7,314   9,800
Prior 14,084   6,545
Revolving Loans Converted to Term 0   0
Revolving 16,704   17,928
Total 54,242   58,198
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Current fiscal year, writeoffs 0   0
Year before current fiscal year, writeoffs 0   0
Two years before current fiscal year, writeoffs 0   0
Three years before current year, writeoffs 0   0
Four years before current fiscal year, writeoffs 0   0
Prior 0   743
Revolving Loans Converted to Term 0   0
Revolving 0   0
Total 0   743
Other | Pass      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   11,659
Year before current fiscal year 11,002   4,945
Two years before current fiscal year 5,138   0
Three years before current year 0   7,321
Four years before current fiscal year 7,314   9,128
Prior 14,084   6,545
Revolving Loans Converted to Term 0   0
Revolving 13,701   14,924
Total 51,239   54,522
Other | Pass/Watch      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Current fiscal year 0   0
Year before current fiscal year 0   0
Two years before current fiscal year 0   0
Three years before current year 0   0
Four years before current fiscal year 0   672
Prior 0   0
Revolving Loans Converted to Term 0   0
Revolving 3,003   3,004
Total $ 3,003   $ 3,676