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Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items]    
Total Loans $ 124,377,234 $ 89,043,040
30-89 Days Past Due 952,219 845,930
Accruing Loans Past Due 90 Days or More 523,662 963,399
Nonaccrual 2,633,005 2,060,083
Loans and leases, net of unearned discount 128,486,120 92,912,452
Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 20,476,197 13,294,872
30-89 Days Past Due 345,622 239,561
Accruing Loans Past Due 90 Days or More 473,541 920,080
Nonaccrual 331,376 355,858
Loans and leases, net of unearned discount 21,626,736 14,810,371
Residential Limited Documentation [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,014,151 1,124,520
30-89 Days Past Due 13,612 16,666
Nonaccrual 112,608 122,888
Loans and leases, net of unearned discount 1,140,371 1,264,074
Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,959,003 3,476,617
30-89 Days Past Due 21,243 15,486
Nonaccrual 79,445 70,488
Loans and leases, net of unearned discount 5,059,691 3,562,591
Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 8,403,078 7,985,173
30-89 Days Past Due 32,654 40,544
Nonaccrual 33,414 27,811
Loans and leases, net of unearned discount 8,469,146 8,053,528
Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,369,475 4,604,772
30-89 Days Past Due 32,220 40,064
Nonaccrual 36,266 34,037
Loans and leases, net of unearned discount 4,437,961 4,678,873
Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,786,347 1,620,147
30-89 Days Past Due 11,734 12,223
Accruing Loans Past Due 90 Days or More 3,141 3,302
Nonaccrual 47,178 44,289
Loans and leases, net of unearned discount 1,848,400 1,679,961
Revolving Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 24,950,573 16,234,904
Revolving Loans [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Accruing Loans Past Due 90 Days or More 1,840  
Nonaccrual 767 263
Loans and leases, net of unearned discount 46,689 72,572
Revolving Loans [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 708 346
Nonaccrual 4,681 4,951
Loans and leases, net of unearned discount 3,324,964 2,353,576
Revolving Loans [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 6,539 1,908
Accruing Loans Past Due 90 Days or More 2,994  
Nonaccrual 44,200 40,807
Loans and leases, net of unearned discount 1,298,370 1,190,811
Revolving Loans Converted to Term Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 1,657,586 1,199,887
Revolving Loans Converted to Term Loans [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 579  
Revolving Loans Converted to Term Loans [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 18,192 14,421
Nonaccrual 67,803 59,787
Loans and leases, net of unearned discount 1,466,707 1,156,983
Revolving Loans Converted to Term Loans [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 491 434
Nonaccrual 110 129
Loans and leases, net of unearned discount 1,903 2,068
Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 20,476,197 13,294,872
30-89 Days Past Due 345,622  
Current [Member] | Residential Limited Documentation [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,014,151 1,124,520
Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,959,003 3,476,617
Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 8,403,078 7,985,173
Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,369,475 4,604,772
Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,786,347 1,620,147
Current [Member] | Revolving Loans [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 44,082 72,309
Current [Member] | Revolving Loans [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 3,319,575 2,348,279
Current [Member] | Revolving Loans [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,244,637 1,148,096
Current [Member] | Revolving Loans Converted to Term Loans [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 579  
Current [Member] | Revolving Loans Converted to Term Loans [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,380,712 1,082,775
Current [Member] | Revolving Loans Converted to Term Loans [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,302 1,505
Term Loans 2022 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 11,936,167  
Term Loans 2022 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Accruing Loans Past Due 90 Days or More 1,573  
Nonaccrual 267  
Loans and leases, net of unearned discount 2,796,207  
Term Loans 2022 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 12,764  
Term Loans 2022 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,792  
Nonaccrual 101  
Loans and leases, net of unearned discount 1,488,582  
Term Loans 2022 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,686  
Nonaccrual 193  
Loans and leases, net of unearned discount 714,594  
Term Loans 2022 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,537  
Nonaccrual 1,368  
Loans and leases, net of unearned discount 133,778  
Term Loans 2022 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 2,774,781  
30-89 Days Past Due 19,586  
Term Loans 2022 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 12,764  
Term Loans 2022 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,486,689  
Term Loans 2022 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 712,715  
Term Loans 2022 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 130,873  
Term Loans 2021 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 20,900,416 18,817,411
Term Loans 2021 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   15,245
Accruing Loans Past Due 90 Days or More 35,314 10,924
Nonaccrual 5,913 3,359
Loans and leases, net of unearned discount 4,205,339 3,086,646
Term Loans 2021 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Nonaccrual 15  
Loans and leases, net of unearned discount 3,582 304
Term Loans 2021 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 6,019 5,929
Nonaccrual 3,646 1,341
Loans and leases, net of unearned discount 2,555,129 2,897,381
Term Loans 2021 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 7,833 8,508
Nonaccrual 5,425 1,588
Loans and leases, net of unearned discount 1,880,969 2,230,157
Term Loans 2021 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,326 2,937
Nonaccrual 522 2,051
Loans and leases, net of unearned discount 206,092 249,334
Term Loans 2021 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,133,015 3,057,118
30-89 Days Past Due 31,097  
Term Loans 2021 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 3,567 304
Term Loans 2021 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 2,545,464 2,890,111
Term Loans 2021 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,867,711 2,220,061
Term Loans 2021 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 204,244 244,346
Term Loans Prior Period [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 30,831,020 18,542,940
Term Loans Prior Period [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   162,666
Accruing Loans Past Due 90 Days or More 368,243 542,749
Nonaccrual 297,888 314,792
Loans and leases, net of unearned discount 9,327,554 6,933,668
Term Loans Prior Period [Member] | Residential Limited Documentation [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 13,612 16,666
Nonaccrual 112,608 122,888
Loans and leases, net of unearned discount 1,140,371 1,264,074
Term Loans Prior Period [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,779 698
Nonaccrual 6,531 5,750
Loans and leases, net of unearned discount 184,109 44,463
Term Loans Prior Period [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 7,467 7,123
Nonaccrual 10,900 7,996
Loans and leases, net of unearned discount 953,042 661,159
Term Loans Prior Period [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 5,764 3,129
Nonaccrual 8,644 5,463
Loans and leases, net of unearned discount 184,428 80,190
Term Loans Prior Period [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 1,027 5,712
Accruing Loans Past Due 90 Days or More 147 3,302
Nonaccrual 278 353
Loans and leases, net of unearned discount 63,116 23,688
Term Loans Prior Period [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 8,410,042 5,913,461
30-89 Days Past Due 251,381  
Term Loans Prior Period [Member] | Current [Member] | Residential Limited Documentation [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,014,151 1,124,520
Term Loans Prior Period [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 175,799 38,015
Term Loans Prior Period [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 934,675 646,040
Term Loans Prior Period [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 170,020 71,598
Term Loans Prior Period [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 61,664 14,321
Term Loans 2020 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 14,675,446 12,376,366
Term Loans 2020 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   12,535
Accruing Loans Past Due 90 Days or More 35,571 100,581
Nonaccrual 7,586 19,858
Loans and leases, net of unearned discount 2,886,573 1,805,064
Term Loans 2020 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Nonaccrual 58  
Loans and leases, net of unearned discount 4,144 777
Term Loans 2020 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 6,605 8,912
Nonaccrual 7,195 4,646
Loans and leases, net of unearned discount 1,804,223 2,101,900
Term Loans 2020 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 5,534 6,615
Nonaccrual 6,912 4,390
Loans and leases, net of unearned discount 886,028 1,108,689
Term Loans 2020 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 409 404
Nonaccrual 310 326
Loans and leases, net of unearned discount 75,844 97,675
Term Loans 2020 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 2,824,197 1,672,090
30-89 Days Past Due 19,219  
Term Loans 2020 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 4,086 777
Term Loans 2020 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,790,423 2,088,342
Term Loans 2020 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 873,582 1,097,684
Term Loans 2020 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 75,125 96,945
Term Loans 2019 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 14,434,776 12,286,933
Term Loans 2019 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   9,886
Accruing Loans Past Due 90 Days or More 12,747 28,512
Nonaccrual 13,513 7,119
Loans and leases, net of unearned discount 1,506,950 1,121,413
Term Loans 2019 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 488  
Loans and leases, net of unearned discount 22,301 2,793
Term Loans 2019 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 6,373 8,317
Nonaccrual 6,395 4,871
Loans and leases, net of unearned discount 1,102,973 1,281,117
Term Loans 2019 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 6,587 8,936
Nonaccrual 8,213 7,847
Loans and leases, net of unearned discount 516,158 678,783
Term Loans 2019 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 268 472
Nonaccrual 278 326
Loans and leases, net of unearned discount 53,925 74,384
Term Loans 2019 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,469,655 1,075,896
30-89 Days Past Due 11,035  
Term Loans 2019 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 21,813 2,793
Term Loans 2019 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 1,090,205 1,267,929
Term Loans 2019 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 501,358 662,000
Term Loans 2019 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 53,379 73,586
Term Loans 2018 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount 9,100,136 7,895,140
Term Loans 2018 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   6,132
Accruing Loans Past Due 90 Days or More 18,253 31,996
Nonaccrual 5,442 4,577
Loans and leases, net of unearned discount 856,845 508,745
Term Loans 2018 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 76 21
Nonaccrual 357  
Loans and leases, net of unearned discount 41,120 1,751
Term Loans 2018 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 4,398 5,074
Nonaccrual 5,177 4,918
Loans and leases, net of unearned discount 565,197 656,875
Term Loans 2018 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 4,816 7,161
Nonaccrual 6,879 7,867
Loans and leases, net of unearned discount 255,784 356,683
Term Loans 2018 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due 137 255
Nonaccrual 112 193
Loans and leases, net of unearned discount 15,372 24,872
Term Loans 2018 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 819,846 466,040
30-89 Days Past Due 13,304  
Term Loans 2018 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 40,687 1,730
Term Loans 2018 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 555,622 646,883
Term Loans 2018 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans 244,089 341,655
Term Loans 2018 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans $ 15,123 24,424
Term Loans 2017 [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount   5,558,871
Term Loans 2017 [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   33,097
Accruing Loans Past Due 90 Days or More   205,318
Nonaccrual   5,890
Loans and leases, net of unearned discount   1,282,263
Term Loans 2017 [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and leases, net of unearned discount   1,944
Term Loans 2017 [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   5,189
Nonaccrual   4,039
Loans and leases, net of unearned discount   455,096
Term Loans 2017 [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   5,715
Nonaccrual   6,882
Loans and leases, net of unearned discount   224,371
Term Loans 2017 [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
30-89 Days Past Due   101
Nonaccrual   104
Loans and leases, net of unearned discount   17,129
Term Loans 2017 [Member] | Current [Member] | Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans   1,037,958
Term Loans 2017 [Member] | Current [Member] | Home Equity Lines and Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans   1,944
Term Loans 2017 [Member] | Current [Member] | Recreational Finance [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans   445,868
Term Loans 2017 [Member] | Current [Member] | Automobile [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans   211,774
Term Loans 2017 [Member] | Current [Member] | Other [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total Loans   $ 16,924