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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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]                    
Current $ 95,564,931 $ 95,120,921                
30-89 Days Past Due 692,490 662,439                
Accruing Loans Past Due 90 Days or More 1,084,553 859,208                
Nonaccrual 1,957,106 1,893,299                
Loans and leases, net of unearned discount 99,299,080 98,535,867                
Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 16,236,649 16,963,561                
Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 1,327,284 1,387,378                
Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 14,198,898 13,764,836                
30-89 Days Past Due 191,860 200,406                
Accruing Loans Past Due 90 Days or More 1,041,873 792,888                
Nonaccrual 385,508 365,729                
Loans and leases, net of unearned discount 15,818,139 15,123,859                
Residential [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 55,576 71,894                
30-89 Days Past Due 244                  
Nonaccrual 194 200                
Loans and leases, net of unearned discount 56,014 72,094                
Residential Limited Documentation [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,372,339 1,462,277                
30-89 Days Past Due 16,136 19,687                
Nonaccrual 143,069 147,170                
Loans and leases, net of unearned discount 1,531,544 1,629,134                
Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 3,720,689 3,881,885                
30-89 Days Past Due 15,926 24,329                
Nonaccrual 79,188 79,392                
Loans and leases, net of unearned discount 3,815,803 3,985,606                
Home Equity Lines and Loans [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 2,458,179 2,569,621                
30-89 Days Past Due 258 939                
Nonaccrual 5,714 5,752                
Loans and leases, net of unearned discount 2,464,151 2,576,312                
Home Equity Lines and Loans [Member] | Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,202,223 1,252,185                
30-89 Days Past Due 14,710 22,242                
Nonaccrual 67,211 67,492                
Loans and leases, net of unearned discount 1,284,144 1,341,919                
Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 7,228,228 7,002,643                
30-89 Days Past Due 26,821 47,161                
Nonaccrual 27,218 25,519                
Loans and leases, net of unearned discount 7,282,267 7,075,323                
Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 4,178,258 4,007,349                
30-89 Days Past Due 28,970 55,498                
Nonaccrual 38,219 39,404                
Loans and leases, net of unearned discount 4,245,447 4,102,251                
Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,319,323 1,346,868                
30-89 Days Past Due 8,292 17,561                
Accruing Loans Past Due 90 Days or More 3,794 4,581                
Nonaccrual 37,307 38,231                
Loans and leases, net of unearned discount 1,368,716 1,407,241                
Other [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 905,388 927,217                
30-89 Days Past Due 4,823 10,594                
Accruing Loans Past Due 90 Days or More 3,458 4,207                
Nonaccrual 34,832 35,044                
Loans and leases, net of unearned discount 948,501 977,062                
Other [Member] | Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,708 1,856                
30-89 Days Past Due 257 481                
Nonaccrual 173 148                
Loans and leases, net of unearned discount 2,138 2,485                
Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 6,690,394 20,949,019 $ 18,077,950 $ 15,628,942 $ 15,326,970 $ 10,466,749 $ 9,890,946 $ 7,893,838 $ 7,438,037 $ 6,013,013
Term Loans [Member] | Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,125,233 2,722,862 1,889,481 1,416,259 1,331,314 618,736 599,352 1,318,094 1,496,417 718,235
30-89 Days Past Due 2,270 13,496 10,190 7,781 5,363 7,258 5,116 13,477 20,138 7,947
Accruing Loans Past Due 90 Days or More   579 97,784 15,234 28,810 38,145 40,613 212,818 248,186 45,804
Nonaccrual 508 3,133 19,705 14,439 12,889 5,183 3,571 6,408 5,003 2,900
Loans and leases, net of unearned discount 1,128,011 2,740,070 2,017,160 1,453,713 1,378,376 669,322 648,652 1,550,797 1,769,744 774,886
Term Loans [Member] | Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 74 773 953 3,983 3,777 1,591 2,316 2,016 2,281 162
30-89 Days Past Due         23       18  
Loans and leases, net of unearned discount 74 773 953 3,983 3,800 1,591 2,316 2,016 2,299 162
Term Loans [Member] | Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 678,012 2,796,359 2,637,664 1,751,766 1,631,536 907,595 841,575 630,151 588,596 352,414
30-89 Days Past Due 459 9,548 5,467 11,255 5,584 8,519 4,372 6,638 4,709 2,938
Nonaccrual 147 1,854 2,217 3,883 4,494 4,072 4,741 4,194 4,697 2,733
Loans and leases, net of unearned discount 678,618 2,807,761 2,645,348 1,766,904 1,641,614 920,186 850,688 640,983 598,002 358,085
Term Loans [Member] | Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 569,198 1,595,636 1,499,937 1,106,782 996,107 629,338 553,269 440,604 377,492 171,017
30-89 Days Past Due 632 6,461 4,010 14,140 7,384 12,542 6,231 12,899 5,963 6,373
Nonaccrual 491 1,615 2,248 7,144 7,925 10,788 9,686 10,061 9,595 5,991
Loans and leases, net of unearned discount 570,321 1,603,712 1,506,195 1,128,066 1,011,416 652,668 569,186 463,564 393,050 183,381
Term Loans [Member] | Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 42,958 160,424 145,146 137,617 121,021 53,702 45,113 32,556 27,818 4,526
30-89 Days Past Due 1,224 1,879 455 1,130 630 577 256 2,301 114 42
Nonaccrual 838 1,493 210 492 562 339 294 183 183 31
Loans and leases, net of unearned discount 45,020 163,796 $ 145,811 $ 139,239 $ 122,213 $ 54,618 $ 45,663 $ 35,040 $ 28,115 $ 4,599
Term Loans Prior Period [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 24,310,850 19,233,367                
Term Loans Prior Period [Member] | Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 7,701,525 6,898,756                
30-89 Days Past Due 148,539 150,447                
Accruing Loans Past Due 90 Days or More 626,480 480,308                
Nonaccrual 343,638 333,466                
Loans and leases, net of unearned discount 8,820,182 7,862,977                
Term Loans Prior Period [Member] | Residential Limited Documentation [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,372,339 1,462,277                
30-89 Days Past Due 16,136 19,687                
Nonaccrual 143,069 147,170                
Loans and leases, net of unearned discount 1,531,544 1,629,134                
Term Loans Prior Period [Member] | Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 50,886 51,554                
30-89 Days Past Due 917 1,148                
Nonaccrual 6,263 6,148                
Loans and leases, net of unearned discount 58,066 58,850                
Term Loans Prior Period [Member] | Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 850,845 564,358                
30-89 Days Past Due 6,230 8,263                
Nonaccrual 10,922 8,783                
Loans and leases, net of unearned discount 867,997 581,404                
Term Loans Prior Period [Member] | Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 182,255 63,972                
30-89 Days Past Due 4,750 3,083                
Nonaccrual 8,274 3,805                
Loans and leases, net of unearned discount 195,279 70,860                
Term Loans Prior Period [Member] | Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 30,171 28,970                
30-89 Days Past Due 533 557                
Accruing Loans Past Due 90 Days or More 336 374                
Nonaccrual 215 501                
Loans and leases, net of unearned discount $ 31,255 $ 30,402