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Loans and Leases - Credit Quality Indicators (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable      
Total $ 52,505,168 $ 50,726,052  
Current period gross write-offs      
Total 176,470 117,212 $ 87,522
Consumer portfolio      
Financing Receivable      
Total financing receivable, Current fiscal year 1,298,754 816,641  
Total financing receivable, Fiscal year before current fiscal year 763,519 2,019,764  
Total financing receivable, Two years before current fiscal year 1,924,258 2,286,113  
Total financing receivable, Three years before current fiscal year 2,156,856 893,040  
Total financing receivable, Four years before current fiscal year 811,965 462,450  
Total financing receivable, More than five years before current fiscal year 2,420,593 2,185,134  
Revolving Loans Amortized Cost Basis 1,061,222 1,133,076  
Total 10,437,167 9,796,218  
Current period gross write-offs      
Current fiscal year 3,467 3,263  
Fiscal year before current fiscal year 17 11  
Two years before current fiscal year 34 470  
Three years before current fiscal year 20 218  
Four years before current fiscal year 115 634  
More than five years before current fiscal year 784 8,107  
Revolving Loans Amortized Cost Basis 573 0  
Total 5,010 12,703 $ 4,662
Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 1,151,655 742,719  
Total financing receivable, Fiscal year before current fiscal year 697,121 1,949,928  
Total financing receivable, Two years before current fiscal year 1,862,151 2,201,633  
Total financing receivable, Three years before current fiscal year 2,082,332 843,276  
Total financing receivable, Four years before current fiscal year 770,546 441,840  
Total financing receivable, More than five years before current fiscal year 2,289,864 2,048,527  
Revolving Loans Amortized Cost Basis 0 0  
Total 8,853,669 8,227,923  
Current period gross write-offs      
Current fiscal year 0 0  
Fiscal year before current fiscal year 0 0  
Two years before current fiscal year 0 387  
Three years before current fiscal year 0 0  
Four years before current fiscal year 0 153  
More than five years before current fiscal year 147 4,630  
Revolving Loans Amortized Cost Basis 0 0  
Total 147 5,170  
Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 37,780 71,452  
Total financing receivable, Fiscal year before current fiscal year 64,724 68,058  
Total financing receivable, Two years before current fiscal year 61,048 81,533  
Total financing receivable, Three years before current fiscal year 72,184 47,700  
Total financing receivable, Four years before current fiscal year 40,991 18,124  
Total financing receivable, More than five years before current fiscal year 129,910 136,013  
Revolving Loans Amortized Cost Basis 1,021,055 1,094,075  
Total 1,427,692 1,516,955  
Current period gross write-offs      
Current fiscal year 0 0  
Fiscal year before current fiscal year 0 4  
Two years before current fiscal year 0 81  
Three years before current fiscal year 0 0  
Four years before current fiscal year 2 104  
More than five years before current fiscal year 444 3,114  
Revolving Loans Amortized Cost Basis 351 0  
Total 797 3,303  
Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 109,319 2,470  
Total financing receivable, Fiscal year before current fiscal year 1,674 1,778  
Total financing receivable, Two years before current fiscal year 1,059 2,947  
Total financing receivable, Three years before current fiscal year 2,340 2,064  
Total financing receivable, Four years before current fiscal year 428 2,486  
Total financing receivable, More than five years before current fiscal year 819 594  
Revolving Loans Amortized Cost Basis 40,167 39,001  
Total 155,806 51,340  
Current period gross write-offs      
Current fiscal year 3,467 3,263  
Fiscal year before current fiscal year 17 7  
Two years before current fiscal year 34 2  
Three years before current fiscal year 20 218  
Four years before current fiscal year 113 377  
More than five years before current fiscal year 193 363  
Revolving Loans Amortized Cost Basis 222 0  
Total 4,066 4,230  
800+ | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 312,771 214,446  
Total financing receivable, Fiscal year before current fiscal year 299,006 847,009  
Total financing receivable, Two years before current fiscal year 909,109 1,096,109  
Total financing receivable, Three years before current fiscal year 1,097,807 451,307  
Total financing receivable, Four years before current fiscal year 433,950 141,919  
Total financing receivable, More than five years before current fiscal year 956,478 910,117  
Revolving Loans Amortized Cost Basis 0 0  
Total 4,009,121 3,660,907  
800+ | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 12,313 27,047  
Total financing receivable, Fiscal year before current fiscal year 25,226 27,439  
Total financing receivable, Two years before current fiscal year 23,512 35,927  
Total financing receivable, Three years before current fiscal year 32,695 25,586  
Total financing receivable, Four years before current fiscal year 22,705 8,110  
Total financing receivable, More than five years before current fiscal year 53,844 56,062  
Revolving Loans Amortized Cost Basis 365,741 391,616  
Total 536,036 571,787  
800+ | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 4,920 432  
Total financing receivable, Fiscal year before current fiscal year 312 356  
Total financing receivable, Two years before current fiscal year 218 1,913  
Total financing receivable, Three years before current fiscal year 1,765 189  
Total financing receivable, Four years before current fiscal year 50 255  
Total financing receivable, More than five years before current fiscal year 284 77  
Revolving Loans Amortized Cost Basis 31,549 25,699  
Total 39,098 28,921  
740-799 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 649,118 363,696  
Total financing receivable, Fiscal year before current fiscal year 258,699 703,568  
Total financing receivable, Two years before current fiscal year 567,545 755,750  
Total financing receivable, Three years before current fiscal year 656,599 279,946  
Total financing receivable, Four years before current fiscal year 235,749 112,303  
Total financing receivable, More than five years before current fiscal year 623,989 633,578  
Revolving Loans Amortized Cost Basis 0 0  
Total 2,991,699 2,848,841  
740-799 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 12,238 24,772  
Total financing receivable, Fiscal year before current fiscal year 21,831 20,069  
Total financing receivable, Two years before current fiscal year 20,718 27,147  
Total financing receivable, Three years before current fiscal year 23,517 13,888  
Total financing receivable, Four years before current fiscal year 10,861 5,158  
Total financing receivable, More than five years before current fiscal year 33,703 34,190  
Revolving Loans Amortized Cost Basis 330,691 355,926  
Total 453,559 481,150  
740-799 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 45,001 1,318  
Total financing receivable, Fiscal year before current fiscal year 721 586  
Total financing receivable, Two years before current fiscal year 301 486  
Total financing receivable, Three years before current fiscal year 165 730  
Total financing receivable, Four years before current fiscal year 124 690  
Total financing receivable, More than five years before current fiscal year 266 381  
Revolving Loans Amortized Cost Basis 3,550 7,180  
Total 50,128 11,371  
670-739 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 172,886 137,460  
Total financing receivable, Fiscal year before current fiscal year 123,354 293,699  
Total financing receivable, Two years before current fiscal year 317,373 292,255  
Total financing receivable, Three years before current fiscal year 271,247 95,838  
Total financing receivable, Four years before current fiscal year 80,318 48,412  
Total financing receivable, More than five years before current fiscal year 550,252 346,663  
Revolving Loans Amortized Cost Basis 0 0  
Total 1,515,430 1,214,327  
670-739 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 11,416 15,857  
Total financing receivable, Fiscal year before current fiscal year 14,298 15,655  
Total financing receivable, Two years before current fiscal year 12,732 15,389  
Total financing receivable, Three years before current fiscal year 13,074 5,992  
Total financing receivable, Four years before current fiscal year 6,242 3,189  
Total financing receivable, More than five years before current fiscal year 28,638 29,454  
Revolving Loans Amortized Cost Basis 224,449 242,189  
Total 310,849 327,725  
670-739 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 57,952 526  
Total financing receivable, Fiscal year before current fiscal year 432 570  
Total financing receivable, Two years before current fiscal year 372 358  
Total financing receivable, Three years before current fiscal year 313 981  
Total financing receivable, Four years before current fiscal year 220 1,210  
Total financing receivable, More than five years before current fiscal year 188 79  
Revolving Loans Amortized Cost Basis 3,349 3,549  
Total 62,826 7,273  
580-669 | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 16,643 20,208  
Total financing receivable, Fiscal year before current fiscal year 13,382 52,962  
Total financing receivable, Two years before current fiscal year 55,507 45,770  
Total financing receivable, Three years before current fiscal year 35,292 14,840  
Total financing receivable, Four years before current fiscal year 16,738 10,492  
Total financing receivable, More than five years before current fiscal year 109,240 106,497  
Revolving Loans Amortized Cost Basis 0 0  
Total 246,802 250,769  
580-669 | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 1,755 3,080  
Total financing receivable, Fiscal year before current fiscal year 2,570 3,786  
Total financing receivable, Two years before current fiscal year 1,685 1,991  
Total financing receivable, Three years before current fiscal year 2,172 1,658  
Total financing receivable, Four years before current fiscal year 754 1,115  
Total financing receivable, More than five years before current fiscal year 9,471 9,988  
Revolving Loans Amortized Cost Basis 67,745 70,102  
Total 86,152 91,720  
580-669 | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 1,417 69  
Total financing receivable, Fiscal year before current fiscal year 116 169  
Total financing receivable, Two years before current fiscal year 105 129  
Total financing receivable, Three years before current fiscal year 69 153  
Total financing receivable, Four years before current fiscal year 25 303  
Total financing receivable, More than five years before current fiscal year 81 56  
Revolving Loans Amortized Cost Basis 1,150 1,983  
Total 2,963 2,862  
579 and below | Consumer portfolio | Residential      
Financing Receivable      
Total financing receivable, Current fiscal year 237 6,909  
Total financing receivable, Fiscal year before current fiscal year 2,680 52,690  
Total financing receivable, Two years before current fiscal year 12,617 11,749  
Total financing receivable, Three years before current fiscal year 21,387 1,345  
Total financing receivable, Four years before current fiscal year 3,791 128,714  
Total financing receivable, More than five years before current fiscal year 49,905 51,672  
Revolving Loans Amortized Cost Basis 0 0  
Total 90,617 253,079  
579 and below | Consumer portfolio | Home equity      
Financing Receivable      
Total financing receivable, Current fiscal year 58 696  
Total financing receivable, Fiscal year before current fiscal year 799 1,109  
Total financing receivable, Two years before current fiscal year 2,401 1,079  
Total financing receivable, Three years before current fiscal year 726 576  
Total financing receivable, Four years before current fiscal year 429 552  
Total financing receivable, More than five years before current fiscal year 4,254 6,319  
Revolving Loans Amortized Cost Basis 32,429 34,242  
Total 41,096 44,573  
579 and below | Consumer portfolio | Other consumer      
Financing Receivable      
Total financing receivable, Current fiscal year 29 125  
Total financing receivable, Fiscal year before current fiscal year 93 97  
Total financing receivable, Two years before current fiscal year 63 61  
Total financing receivable, Three years before current fiscal year 28 11  
Total financing receivable, Four years before current fiscal year 9 28  
Total financing receivable, More than five years before current fiscal year 0 1  
Revolving Loans Amortized Cost Basis 569 590  
Total $ 791 $ 913