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Loans and Leases - Credit Quality Indicators (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable      
Total $ 56,597,110 $ 52,505,168  
Current period gross write-offs      
Total 189,290 176,470 $ 117,212
Consumer portfolio      
Financing Receivable      
Total financing receivable, Current fiscal year 1,683,622 1,298,754  
Total financing receivable, Fiscal year before current fiscal year 1,264,220 763,519  
Total financing receivable, Two years before current fiscal year 651,351 1,924,258  
Total financing receivable, Three years before current fiscal year 1,822,158 2,156,856  
Total financing receivable, Four years before current fiscal year 2,018,069 811,965  
Total financing receivable, More than five years before current fiscal year 2,908,007 2,420,593  
Revolving Loans Amortized Cost Basis 1,019,487 1,061,222  
Total 11,366,914 10,437,167  
Current period gross write-offs      
Current fiscal year 3,325 3,467  
Fiscal year before current fiscal year 3,641 17  
Two years before current fiscal year 19 34  
Three years before current fiscal year 11 20  
Four years before current fiscal year 7 115  
More than five years before current fiscal year 180 784  
Revolving Loans Amortized Cost Basis 343 573  
Total 7,526 5,010 $ 12,703
Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 1,407,722 1,151,655  
Total financing receivable, Fiscal year before current fiscal year 1,110,459 697,121  
Total financing receivable, Two years before current fiscal year 596,381 1,862,151  
Total financing receivable, Three years before current fiscal year 1,767,892 2,082,332  
Total financing receivable, Four years before current fiscal year 1,952,691 770,546  
Total financing receivable, More than five years before current fiscal year 2,764,432 2,289,864  
Revolving Loans Amortized Cost Basis 0 0  
Total 9,599,577 8,853,669  
Current period gross write-offs      
Current fiscal year 0 0  
Fiscal year before current fiscal year 0 0  
Two years before current fiscal year 0 0  
Three years before current fiscal year 0 0  
Four years before current fiscal year 0 0  
More than five years before current fiscal year 135 147  
Revolving Loans Amortized Cost Basis 0 0  
Total 135 147  
Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 40,349 37,780  
Total financing receivable, Fiscal year before current fiscal year 32,361 64,724  
Total financing receivable, Two years before current fiscal year 53,927 61,048  
Total financing receivable, Three years before current fiscal year 53,703 72,184  
Total financing receivable, Four years before current fiscal year 63,495 40,991  
Total financing receivable, More than five years before current fiscal year 143,074 129,910  
Revolving Loans Amortized Cost Basis 983,604 1,021,055  
Total 1,370,513 1,427,692  
Current period gross write-offs      
Current fiscal year 0 0  
Fiscal year before current fiscal year 50 0  
Two years before current fiscal year 0 0  
Three years before current fiscal year 1 0  
Four years before current fiscal year 0 2  
More than five years before current fiscal year 38 444  
Revolving Loans Amortized Cost Basis 175 351  
Total 264 797  
Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 235,551 109,319  
Total financing receivable, Fiscal year before current fiscal year 121,400 1,674  
Total financing receivable, Two years before current fiscal year 1,043 1,059  
Total financing receivable, Three years before current fiscal year 563 2,340  
Total financing receivable, Four years before current fiscal year 1,883 428  
Total financing receivable, More than five years before current fiscal year 501 819  
Revolving Loans Amortized Cost Basis 35,883 40,167  
Total 396,824 155,806  
Current period gross write-offs      
Current fiscal year 3,325 3,467  
Fiscal year before current fiscal year 3,591 17  
Two years before current fiscal year 19 34  
Three years before current fiscal year 10 20  
Four years before current fiscal year 7 113  
More than five years before current fiscal year 7 193  
Revolving Loans Amortized Cost Basis 168 222  
Total 7,127 4,066  
800+ | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 517,482 312,771  
Total financing receivable, Fiscal year before current fiscal year 551,613 299,006  
Total financing receivable, Two years before current fiscal year 272,249 909,109  
Total financing receivable, Three years before current fiscal year 918,256 1,097,807  
Total financing receivable, Four years before current fiscal year 1,045,573 433,950  
Total financing receivable, More than five years before current fiscal year 1,258,654 956,478  
Revolving Loans Amortized Cost Basis 0 0  
Total 4,563,827 4,009,121  
800+ | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 11,847 12,313  
Total financing receivable, Fiscal year before current fiscal year 8,896 25,226  
Total financing receivable, Two years before current fiscal year 23,146 23,512  
Total financing receivable, Three years before current fiscal year 22,811 32,695  
Total financing receivable, Four years before current fiscal year 29,498 22,705  
Total financing receivable, More than five years before current fiscal year 65,401 53,844  
Revolving Loans Amortized Cost Basis 348,961 365,741  
Total 510,560 536,036  
800+ | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 11,131 4,920  
Total financing receivable, Fiscal year before current fiscal year 4,799 312  
Total financing receivable, Two years before current fiscal year 254 218  
Total financing receivable, Three years before current fiscal year 74 1,765  
Total financing receivable, Four years before current fiscal year 1,677 50  
Total financing receivable, More than five years before current fiscal year 171 284  
Revolving Loans Amortized Cost Basis 16,597 31,549  
Total 34,703 39,098  
740-799 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 687,120 649,118  
Total financing receivable, Fiscal year before current fiscal year 419,019 258,699  
Total financing receivable, Two years before current fiscal year 212,246 567,545  
Total financing receivable, Three years before current fiscal year 480,885 656,599  
Total financing receivable, Four years before current fiscal year 598,172 235,749  
Total financing receivable, More than five years before current fiscal year 748,825 623,989  
Revolving Loans Amortized Cost Basis 0 0  
Total 3,146,267 2,991,699  
740-799 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 15,932 12,238  
Total financing receivable, Fiscal year before current fiscal year 11,658 21,831  
Total financing receivable, Two years before current fiscal year 16,149 20,718  
Total financing receivable, Three years before current fiscal year 16,523 23,517  
Total financing receivable, Four years before current fiscal year 19,123 10,861  
Total financing receivable, More than five years before current fiscal year 35,861 33,703  
Revolving Loans Amortized Cost Basis 317,846 330,691  
Total 433,092 453,559  
740-799 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 88,171 45,001  
Total financing receivable, Fiscal year before current fiscal year 46,222 721  
Total financing receivable, Two years before current fiscal year 368 301  
Total financing receivable, Three years before current fiscal year 145 165  
Total financing receivable, Four years before current fiscal year 30 124  
Total financing receivable, More than five years before current fiscal year 136 266  
Revolving Loans Amortized Cost Basis 3,273 3,550  
Total 138,345 50,128  
670-739 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 185,620 172,886  
Total financing receivable, Fiscal year before current fiscal year 118,104 123,354  
Total financing receivable, Two years before current fiscal year 84,332 317,373  
Total financing receivable, Three years before current fiscal year 294,954 271,247  
Total financing receivable, Four years before current fiscal year 241,266 80,318  
Total financing receivable, More than five years before current fiscal year 604,881 550,252  
Revolving Loans Amortized Cost Basis 0 0  
Total 1,529,157 1,515,430  
670-739 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 10,811 11,416  
Total financing receivable, Fiscal year before current fiscal year 9,786 14,298  
Total financing receivable, Two years before current fiscal year 10,120 12,732  
Total financing receivable, Three years before current fiscal year 9,351 13,074  
Total financing receivable, Four years before current fiscal year 11,025 6,242  
Total financing receivable, More than five years before current fiscal year 27,662 28,638  
Revolving Loans Amortized Cost Basis 217,924 224,449  
Total 296,679 310,849  
670-739 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 133,564 57,952  
Total financing receivable, Fiscal year before current fiscal year 68,381 432  
Total financing receivable, Two years before current fiscal year 282 372  
Total financing receivable, Three years before current fiscal year 231 313  
Total financing receivable, Four years before current fiscal year 130 220  
Total financing receivable, More than five years before current fiscal year 133 188  
Revolving Loans Amortized Cost Basis 14,439 3,349  
Total 217,160 62,826  
580-669 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 16,852 16,643  
Total financing receivable, Fiscal year before current fiscal year 19,346 13,382  
Total financing receivable, Two years before current fiscal year 23,602 55,507  
Total financing receivable, Three years before current fiscal year 51,886 35,292  
Total financing receivable, Four years before current fiscal year 45,714 16,738  
Total financing receivable, More than five years before current fiscal year 100,593 109,240  
Revolving Loans Amortized Cost Basis 0 0  
Total 257,993 246,802  
580-669 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 1,682 1,755  
Total financing receivable, Fiscal year before current fiscal year 1,522 2,570  
Total financing receivable, Two years before current fiscal year 2,850 1,685  
Total financing receivable, Three years before current fiscal year 2,731 2,172  
Total financing receivable, Four years before current fiscal year 2,941 754  
Total financing receivable, More than five years before current fiscal year 9,607 9,471  
Revolving Loans Amortized Cost Basis 68,953 67,745  
Total 90,286 86,152  
580-669 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 2,651 1,417  
Total financing receivable, Fiscal year before current fiscal year 1,962 116  
Total financing receivable, Two years before current fiscal year 74 105  
Total financing receivable, Three years before current fiscal year 60 69  
Total financing receivable, Four years before current fiscal year 27 25  
Total financing receivable, More than five years before current fiscal year 59 81  
Revolving Loans Amortized Cost Basis 1,136 1,150  
Total 5,969 2,963  
579 and below | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 648 237  
Total financing receivable, Fiscal year before current fiscal year 2,377 2,680  
Total financing receivable, Two years before current fiscal year 3,952 12,617  
Total financing receivable, Three years before current fiscal year 21,911 21,387  
Total financing receivable, Four years before current fiscal year 21,966 3,791  
Total financing receivable, More than five years before current fiscal year 51,479 49,905  
Revolving Loans Amortized Cost Basis 0 0  
Total 102,333 90,617  
579 and below | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 77 58  
Total financing receivable, Fiscal year before current fiscal year 499 799  
Total financing receivable, Two years before current fiscal year 1,662 2,401  
Total financing receivable, Three years before current fiscal year 2,287 726  
Total financing receivable, Four years before current fiscal year 908 429  
Total financing receivable, More than five years before current fiscal year 4,543 4,254  
Revolving Loans Amortized Cost Basis 29,920 32,429  
Total 39,896 41,096  
579 and below | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 34 29  
Total financing receivable, Fiscal year before current fiscal year 36 93  
Total financing receivable, Two years before current fiscal year 65 63  
Total financing receivable, Three years before current fiscal year 53 28  
Total financing receivable, Four years before current fiscal year 19 9  
Total financing receivable, More than five years before current fiscal year 2 0  
Revolving Loans Amortized Cost Basis 438 569  
Total $ 647 $ 791