v3.26.1
Loans and Allowance for Credit Losses for Loans - Amortized Cost In Those Loan Classes Based on Payment Activity by Origination Year (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 52,467,251   $ 52,467,251   $ 50,136,728
Gross loan charge-offs          
Total 27,626 $ 42,071 47,427 $ 86,090  
90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 16,066   16,066   4,582
Residential mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 406,564   406,564   604,433
Year two, fiscal year before current fiscal year 598,727   598,727   377,485
Year three, two years before current fiscal year 358,754   358,754   385,962
Year four, three years before current fiscal year 362,679   362,679   1,224,180
Year five, four years before current fiscal year 1,179,682   1,179,682   1,343,813
More than five years before current fiscal year 2,998,818   2,998,818   1,806,076
Revolving Loans Amortized Cost Basis 77,029   77,029   83,562
Revolving Loans Converted to Term Loans 688   688   681
Total 5,982,941   5,982,941   5,826,192
Gross loan charge-offs          
Total 0 46 0 46  
Residential mortgage | 90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 5,223   5,223   3,300
Residential mortgage | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 406,564   406,564   604,433
Year two, fiscal year before current fiscal year 598,212   598,212   373,656
Year three, two years before current fiscal year 353,938   353,938   384,909
Year four, three years before current fiscal year 360,693   360,693   1,222,224
Year five, four years before current fiscal year 1,178,351   1,178,351   1,339,378
More than five years before current fiscal year 2,986,001   2,986,001   1,792,530
Revolving Loans Amortized Cost Basis 77,029   77,029   83,562
Revolving Loans Converted to Term Loans 7   7   0
Total 5,960,795   5,960,795   5,800,692
Residential mortgage | Non-performing loan held for sale | 90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 515   515   3,829
Year three, two years before current fiscal year 4,816   4,816   1,053
Year four, three years before current fiscal year 1,986   1,986   1,956
Year five, four years before current fiscal year 1,331   1,331   4,435
More than five years before current fiscal year 12,817   12,817   13,546
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 681   681   681
Total 22,146   22,146   25,500
Consumer loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 441,224   441,224   1,066,088
Year two, fiscal year before current fiscal year 889,488   889,488   623,287
Year three, two years before current fiscal year 499,052   499,052   261,168
Year four, three years before current fiscal year 205,317   205,317   256,681
Year five, four years before current fiscal year 192,265   192,265   112,589
More than five years before current fiscal year 197,999   197,999   138,341
Revolving Loans Amortized Cost Basis 1,730,545   1,730,545   1,618,681
Revolving Loans Converted to Term Loans 18,343   18,343   28,200
Total 4,174,233   4,174,233   4,105,035
Gross loan charge-offs          
Total 3,354 2,213 6,617 4,353  
Consumer loans | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 11,863   11,863   23,659
Year two, fiscal year before current fiscal year 22,202   22,202   18,139
Year three, two years before current fiscal year 16,046   16,046   24,468
Year four, three years before current fiscal year 21,338   21,338   34,372
Year five, four years before current fiscal year 32,004   32,004   9,142
More than five years before current fiscal year 57,879   57,879   51,563
Revolving Loans Amortized Cost Basis 560,795   560,795   518,208
Revolving Loans Converted to Term Loans 6,496   6,496   8,129
Total 728,623   728,623   687,680
Consumer loans | Automobile          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 427,012   427,012   1,037,102
Year two, fiscal year before current fiscal year 863,720   863,720   595,050
Year three, two years before current fiscal year 474,027   474,027   219,453
Year four, three years before current fiscal year 168,594   168,594   209,866
Year five, four years before current fiscal year 149,156   149,156   98,884
More than five years before current fiscal year 67,580   67,580   24,245
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 0   0   0
Total 2,150,089   2,150,089   2,184,600
Consumer loans | Other consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 2,349   2,349   5,327
Year two, fiscal year before current fiscal year 3,566   3,566   10,098
Year three, two years before current fiscal year 8,979   8,979   17,247
Year four, three years before current fiscal year 15,385   15,385   12,443
Year five, four years before current fiscal year 11,105   11,105   4,563
More than five years before current fiscal year 72,540   72,540   62,533
Revolving Loans Amortized Cost Basis 1,169,750   1,169,750   1,100,473
Revolving Loans Converted to Term Loans 11,847   11,847   20,071
Total 1,295,521   1,295,521   1,232,755
Consumer loans | 90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 1,862   1,862   1,070
Consumer loans | 90 Days or More Past Due Loans | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 0   0   0
Consumer loans | 90 Days or More Past Due Loans | Automobile          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 1,007   1,007   611
Consumer loans | 90 Days or More Past Due Loans | Other consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 855   855   459
Consumer loans | Performing | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 11,863   11,863   23,659
Year two, fiscal year before current fiscal year 22,202   22,202   18,041
Year three, two years before current fiscal year 15,802   15,802   23,970
Year four, three years before current fiscal year 21,014   21,014   33,368
Year five, four years before current fiscal year 30,915   30,915   9,142
More than five years before current fiscal year 57,169   57,169   51,005
Revolving Loans Amortized Cost Basis 560,780   560,780   518,208
Revolving Loans Converted to Term Loans 6,259   6,259   7,566
Total 726,004   726,004   684,959
Consumer loans | Performing | Automobile          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 426,951   426,951   1,036,932
Year two, fiscal year before current fiscal year 863,060   863,060   594,866
Year three, two years before current fiscal year 473,798   473,798   219,316
Year four, three years before current fiscal year 168,441   168,441   209,781
Year five, four years before current fiscal year 149,041   149,041   98,805
More than five years before current fiscal year 67,450   67,450   24,078
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 0   0   0
Total 2,148,741   2,148,741   2,183,778
Consumer loans | Performing | Other consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 2,344   2,344   5,327
Year two, fiscal year before current fiscal year 3,551   3,551   10,098
Year three, two years before current fiscal year 8,973   8,973   17,242
Year four, three years before current fiscal year 15,385   15,385   12,441
Year five, four years before current fiscal year 11,063   11,063   4,563
More than five years before current fiscal year 72,522   72,522   62,516
Revolving Loans Amortized Cost Basis 1,169,259   1,169,259   1,100,473
Revolving Loans Converted to Term Loans 11,783   11,783   19,962
Total 1,294,880   1,294,880   1,232,622
Consumer loans | Non-performing loan held for sale | 90 Days or More Past Due Loans | Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   98
Year three, two years before current fiscal year 244   244   498
Year four, three years before current fiscal year 324   324   1,004
Year five, four years before current fiscal year 1,089   1,089   0
More than five years before current fiscal year 710   710   558
Revolving Loans Amortized Cost Basis 15   15   0
Revolving Loans Converted to Term Loans 237   237   563
Total 2,619   2,619   2,721
Consumer loans | Non-performing loan held for sale | 90 Days or More Past Due Loans | Automobile          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 61   61   170
Year two, fiscal year before current fiscal year 660   660   184
Year three, two years before current fiscal year 229   229   137
Year four, three years before current fiscal year 153   153   85
Year five, four years before current fiscal year 115   115   79
More than five years before current fiscal year 130   130   167
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 0   0   0
Total 1,348   1,348   822
Consumer loans | Non-performing loan held for sale | 90 Days or More Past Due Loans | Other consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 5   5   0
Year two, fiscal year before current fiscal year 15   15   0
Year three, two years before current fiscal year 6   6   5
Year four, three years before current fiscal year 0   0   2
Year five, four years before current fiscal year 42   42   0
More than five years before current fiscal year 18   18   17
Revolving Loans Amortized Cost Basis 491   491   0
Revolving Loans Converted to Term Loans 64   64   109
Total 641   641   133
Gross loan charge-offs          
Gross loan charge-offs          
Year one, gross loan charge-offs     26   760
Year two, gross loan charge-offs     1,300   2,181
Year three, gross loan charge-offs     997   1,163
Year four, gross loan charge-offs     575   1,041
Year five, gross loan charge-offs     346   466
More than five years gross loan charge-offs     3,336   2,727
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term Loans     37   625
Total     6,617   8,963
Commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 987,205   987,205   1,506,116
Year two, fiscal year before current fiscal year 1,335,766   1,335,766   1,351,742
Year three, two years before current fiscal year 1,124,104   1,124,104   712,288
Year four, three years before current fiscal year 598,118   598,118   591,475
Year five, four years before current fiscal year 556,892   556,892   356,942
More than five years before current fiscal year 960,500   960,500   639,274
Revolving Loans Amortized Cost Basis 6,357,982   6,357,982   5,764,130
Revolving Loans Converted to Term Loans 40,675   40,675   39,552
Total 11,961,242   11,961,242   10,961,519
Gross loan charge-offs          
Total 9,838 25,189 12,620 53,645  
Commercial and industrial | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 983,702   983,702   1,501,570
Year two, fiscal year before current fiscal year 1,324,496   1,324,496   1,333,581
Year three, two years before current fiscal year 1,066,910   1,066,910   676,608
Year four, three years before current fiscal year 536,920   536,920   511,649
Year five, four years before current fiscal year 486,773   486,773   343,565
More than five years before current fiscal year 820,951   820,951   500,972
Revolving Loans Amortized Cost Basis 6,051,460   6,051,460   5,438,418
Revolving Loans Converted to Term Loans 6,532   6,532   8,600
Total 11,277,744   11,277,744   10,314,963
Commercial and industrial | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   1,475
Year two, fiscal year before current fiscal year 2,202   2,202   13,426
Year three, two years before current fiscal year 15,738   15,738   4,767
Year four, three years before current fiscal year 25,977   25,977   18,941
Year five, four years before current fiscal year 12,704   12,704   10,050
More than five years before current fiscal year 17,989   17,989   13,064
Revolving Loans Amortized Cost Basis 115,345   115,345   151,511
Revolving Loans Converted to Term Loans 7,156   7,156   6,964
Total 197,111   197,111   220,198
Commercial and industrial | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 3,503   3,503   3,071
Year two, fiscal year before current fiscal year 9,068   9,068   4,735
Year three, two years before current fiscal year 41,456   41,456   26,196
Year four, three years before current fiscal year 31,125   31,125   60,885
Year five, four years before current fiscal year 57,415   57,415   3,327
More than five years before current fiscal year 79,516   79,516   78,607
Revolving Loans Amortized Cost Basis 190,335   190,335   172,627
Revolving Loans Converted to Term Loans 26,987   26,987   23,988
Total 439,405   439,405   373,436
Commercial and industrial | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   0
Year three, two years before current fiscal year 0   0   4,717
Year four, three years before current fiscal year 4,096   4,096   0
Year five, four years before current fiscal year 0   0   0
More than five years before current fiscal year 42,044   42,044   46,631
Revolving Loans Amortized Cost Basis 842   842   1,574
Revolving Loans Converted to Term Loans 0   0   0
Total 46,982   46,982   52,922
Commercial and industrial | 90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 3,527   3,527   0
Commercial Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 30,348,835   30,348,835   29,243,982
Gross loan charge-offs          
Total 14,434 $ 14,623 28,190 $ 28,046  
Commercial Real Estate | Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 2,673,192   2,673,192   3,184,086
Year two, fiscal year before current fiscal year 3,213,865   3,213,865   1,992,021
Year three, two years before current fiscal year 1,703,455   1,703,455   2,898,380
Year four, three years before current fiscal year 2,646,443   2,646,443   5,392,757
Year five, four years before current fiscal year 5,311,555   5,311,555   3,913,173
More than five years before current fiscal year 11,612,840   11,612,840   8,522,187
Revolving Loans Amortized Cost Basis 672,237   672,237   818,250
Revolving Loans Converted to Term Loans 40,139   40,139   51,895
Total 27,873,726   27,873,726   26,772,749
Commercial Real Estate | Commercial real estate | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 2,671,281   2,671,281   3,179,469
Year two, fiscal year before current fiscal year 3,202,290   3,202,290   1,802,585
Year three, two years before current fiscal year 1,529,892   1,529,892   2,501,008
Year four, three years before current fiscal year 2,313,592   2,313,592   4,926,062
Year five, four years before current fiscal year 4,706,311   4,706,311   3,406,631
More than five years before current fiscal year 10,069,598   10,069,598   7,387,804
Revolving Loans Amortized Cost Basis 482,388   482,388   576,394
Revolving Loans Converted to Term Loans 9,526   9,526   20,952
Total 24,984,878   24,984,878   23,800,905
Commercial Real Estate | Commercial real estate | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 1,911   1,911   4,617
Year two, fiscal year before current fiscal year 7,637   7,637   90,876
Year three, two years before current fiscal year 139,063   139,063   218,532
Year four, three years before current fiscal year 181,535   181,535   154,578
Year five, four years before current fiscal year 254,143   254,143   112,038
More than five years before current fiscal year 374,659   374,659   305,609
Revolving Loans Amortized Cost Basis 92,553   92,553   116,595
Revolving Loans Converted to Term Loans 30,613   30,613   30,943
Total 1,082,114   1,082,114   1,033,788
Commercial Real Estate | Commercial real estate | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 3,938   3,938   98,560
Year three, two years before current fiscal year 34,500   34,500   175,780
Year four, three years before current fiscal year 151,316   151,316   312,117
Year five, four years before current fiscal year 351,101   351,101   365,371
More than five years before current fiscal year 1,122,826   1,122,826   818,034
Revolving Loans Amortized Cost Basis 97,296   97,296   125,261
Revolving Loans Converted to Term Loans 0   0   0
Total 1,760,977   1,760,977   1,895,123
Commercial Real Estate | Commercial real estate | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   0
Year three, two years before current fiscal year 0   0   3,060
Year four, three years before current fiscal year 0   0   0
Year five, four years before current fiscal year 0   0   29,133
More than five years before current fiscal year 45,757   45,757   10,740
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term Loans 0   0   0
Total 45,757   45,757   42,933
Commercial Real Estate | Construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 339,346   339,346   717,058
Year two, fiscal year before current fiscal year 741,344   741,344   526,130
Year three, two years before current fiscal year 367,391   367,391   225,289
Year four, three years before current fiscal year 215,951   215,951   308,008
Year five, four years before current fiscal year 249,234   249,234   80,240
More than five years before current fiscal year 125,402   125,402   58,977
Revolving Loans Amortized Cost Basis 396,555   396,555   498,119
Revolving Loans Converted to Term Loans 39,886   39,886   57,412
Total 2,475,109   2,475,109   2,471,233
Commercial Real Estate | Construction | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 339,346   339,346   712,797
Year two, fiscal year before current fiscal year 736,849   736,849   494,598
Year three, two years before current fiscal year 350,644   350,644   215,960
Year four, three years before current fiscal year 215,951   215,951   266,072
Year five, four years before current fiscal year 208,217   208,217   50,397
More than five years before current fiscal year 102,005   102,005   50,442
Revolving Loans Amortized Cost Basis 331,133   331,133   368,005
Revolving Loans Converted to Term Loans 0   0   17,474
Total 2,284,145   2,284,145   2,175,745
Commercial Real Estate | Construction | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   4,261
Year two, fiscal year before current fiscal year 4,495   4,495   31,142
Year three, two years before current fiscal year 16,358   16,358   9,329
Year four, three years before current fiscal year 0   0   2,859
Year five, four years before current fiscal year 1,160   1,160   28,205
More than five years before current fiscal year 13,219   13,219   0
Revolving Loans Amortized Cost Basis 57,639   57,639   78,494
Revolving Loans Converted to Term Loans 6,895   6,895   6,973
Total 99,766   99,766   161,263
Commercial Real Estate | Construction | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one, current fiscal year 0   0   0
Year two, fiscal year before current fiscal year 0   0   390
Year three, two years before current fiscal year 389   389   0
Year four, three years before current fiscal year 0   0   39,077
Year five, four years before current fiscal year 39,857   39,857   1,638
More than five years before current fiscal year 10,178   10,178   8,535
Revolving Loans Amortized Cost Basis 7,783   7,783   51,620
Revolving Loans Converted to Term Loans 32,991   32,991   32,965
Total 91,198   91,198   134,225
Commercial Real Estate | 90 Days or More Past Due Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 5,454   5,454   212
Commercial Real Estate | 90 Days or More Past Due Loans | Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 5,454   5,454   212
Commercial Real Estate | 90 Days or More Past Due Loans | Construction          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 0   0   0
Commercial and Industrial and Commercial Real Estate          
Gross loan charge-offs          
Year one, gross loan charge-offs     0   1,979
Year two, gross loan charge-offs     232   7,048
Year three, gross loan charge-offs     1,820   4,031
Year four, gross loan charge-offs     733   21,122
Year five, gross loan charge-offs     567   15,471
More than five years gross loan charge-offs     32,601   29,715
Revolving Loans Amortized Cost Basis     4,857   23,458
Revolving Loans Converted to Term Loans     0   15,921
Total     $ 40,810   $ 118,745