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Loans and Allowance for Credit Losses for Loans - Amortized Cost per Loan Class Based on Payment Activity by Origination Year (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 50,136,728 $ 48,799,711
Gross loan charge-offs    
Total 127,708 215,112
90 Days or More Past Due Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 4,582 5,889
Residential mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 604,433 428,668
Year two, fiscal year before current fiscal year 377,485 414,299
Year three, two years before current fiscal year 385,962 1,283,554
Year four, three years before current fiscal year 1,224,180 1,422,368
Year five, four years before current fiscal year 1,343,813 499,716
More than five years before current fiscal year 1,806,076 1,506,797
Revolving Loans Amortized Cost Basis 83,562 75,479
Revolving Loans Converted to Term Loans 681 1,635
Total 5,826,192 5,632,516
Gross loan charge-offs    
Total 72 29
Residential mortgage | 90 Days or More Past Due Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 3,300 3,533
Residential mortgage | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 604,433 428,138
Year two, fiscal year before current fiscal year 373,656 413,528
Year three, two years before current fiscal year 384,909 1,282,524
Year four, three years before current fiscal year 1,222,224 1,420,835
Year five, four years before current fiscal year 1,339,378 494,430
More than five years before current fiscal year 1,792,530 1,490,512
Revolving Loans Amortized Cost Basis 83,562 75,479
Revolving Loans Converted to Term Loans 0 954
Total 5,800,692 5,606,400
Residential mortgage | Nonperforming financial loans | 90 Days or More Past Due Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 0 530
Year two, fiscal year before current fiscal year 3,829 771
Year three, two years before current fiscal year 1,053 1,030
Year four, three years before current fiscal year 1,956 1,533
Year five, four years before current fiscal year 4,435 5,286
More than five years before current fiscal year 13,546 16,285
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 681 681
Total 25,500 26,116
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 1,066,088 901,463
Year two, fiscal year before current fiscal year 623,287 398,761
Year three, two years before current fiscal year 261,168 418,714
Year four, three years before current fiscal year 256,681 223,255
Year five, four years before current fiscal year 112,589 62,967
More than five years before current fiscal year 138,341 165,116
Revolving Loans Amortized Cost Basis 1,618,681 1,395,156
Revolving Loans Converted to Term Loans 28,200 25,405
Total 4,105,035 3,590,837
Gross loan charge-offs    
Total 8,891 8,289
Consumer | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 23,659 22,947
Year two, fiscal year before current fiscal year 18,139 29,493
Year three, two years before current fiscal year 24,468 38,825
Year four, three years before current fiscal year 34,372 10,303
Year five, four years before current fiscal year 9,142 3,340
More than five years before current fiscal year 51,563 51,468
Revolving Loans Amortized Cost Basis 518,208 438,817
Revolving Loans Converted to Term Loans 8,129 9,240
Total 687,680 604,433
Consumer | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 1,037,102 863,352
Year two, fiscal year before current fiscal year 595,050 343,325
Year three, two years before current fiscal year 219,453 364,041
Year four, three years before current fiscal year 209,866 211,364
Year five, four years before current fiscal year 98,884 59,290
More than five years before current fiscal year 24,245 59,693
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 0 0
Total 2,184,600 1,901,065
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 5,327 15,164
Year two, fiscal year before current fiscal year 10,098 25,943
Year three, two years before current fiscal year 17,247 15,848
Year four, three years before current fiscal year 12,443 1,588
Year five, four years before current fiscal year 4,563 337
More than five years before current fiscal year 62,533 53,955
Revolving Loans Amortized Cost Basis 1,100,473 956,339
Revolving Loans Converted to Term Loans 20,071 16,165
Total 1,232,755 1,085,339
Consumer | 90 Days or More Past Due Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,070 1,049
Consumer | 90 Days or More Past Due Loans | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Consumer | 90 Days or More Past Due Loans | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 611 407
Consumer | 90 Days or More Past Due Loans | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 459 642
Consumer | Performing | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 23,659 22,947
Year two, fiscal year before current fiscal year 18,041 29,445
Year three, two years before current fiscal year 23,970 38,774
Year four, three years before current fiscal year 33,368 10,302
Year five, four years before current fiscal year 9,142 3,340
More than five years before current fiscal year 51,005 50,613
Revolving Loans Amortized Cost Basis 518,208 438,817
Revolving Loans Converted to Term Loans 7,566 9,061
Total 684,959 603,299
Consumer | Performing | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 1,036,932 863,281
Year two, fiscal year before current fiscal year 594,866 343,203
Year three, two years before current fiscal year 219,316 363,901
Year four, three years before current fiscal year 209,781 211,294
Year five, four years before current fiscal year 98,805 59,288
More than five years before current fiscal year 24,078 59,512
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 0 0
Total 2,183,778 1,900,479
Consumer | Performing | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 5,327 15,164
Year two, fiscal year before current fiscal year 10,098 25,884
Year three, two years before current fiscal year 17,242 15,787
Year four, three years before current fiscal year 12,441 1,588
Year five, four years before current fiscal year 4,563 337
More than five years before current fiscal year 62,516 53,917
Revolving Loans Amortized Cost Basis 1,100,473 956,339
Revolving Loans Converted to Term Loans 19,962 15,917
Total 1,232,622 1,084,933
Consumer | Nonperforming financial loans | 90 Days or More Past Due Loans | Home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 0 0
Year two, fiscal year before current fiscal year 98 48
Year three, two years before current fiscal year 498 51
Year four, three years before current fiscal year 1,004 1
Year five, four years before current fiscal year 0 0
More than five years before current fiscal year 558 855
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 563 179
Total 2,721 1,134
Consumer | Nonperforming financial loans | 90 Days or More Past Due Loans | Automobile    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 170 71
Year two, fiscal year before current fiscal year 184 122
Year three, two years before current fiscal year 137 140
Year four, three years before current fiscal year 85 70
Year five, four years before current fiscal year 79 2
More than five years before current fiscal year 167 181
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 0 0
Total 822 586
Consumer | Nonperforming financial loans | 90 Days or More Past Due Loans | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year one, current fiscal year 0 0
Year two, fiscal year before current fiscal year 0 59
Year three, two years before current fiscal year 5 61
Year four, three years before current fiscal year 2 0
Year five, four years before current fiscal year 0 0
More than five years before current fiscal year 17 38
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 109 248
Total 133 406
Residential Mortgage and Consumer    
Gross loan charge-offs    
Year one, gross loan charge-offs 760 1,014
Year two, gross loan charge-offs 2,181 1,883
Year three, gross loan charge-offs 1,163 1,511
Year four, gross loan charge-offs 1,041 1,015
Year five, gross loan charge-offs 466 519
More than five years gross loan charge-offs 2,727 2,245
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans 625 131
Total $ 8,963 $ 8,318