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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
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]                    
30-89 Days Past Due $ 836,574 $ 662,439                
Accruing Loans Past Due 90 Days or More 1,026,080 859,208                
Nonaccrual 2,242,263 1,893,299                
Loans and leases, net of unearned discount 93,582,894 98,535,867                
Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 14,856,175 16,963,561                
Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 1,233,297 1,387,378                
Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 13,314,202 13,764,836                
30-89 Days Past Due 255,187 200,406                
Accruing Loans Past Due 90 Days or More 945,148 792,888                
Nonaccrual 353,426 365,729                
Loans and leases, net of unearned discount 14,867,963 15,123,859                
Residential [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 62,635 71,894                
Nonaccrual 273 200                
Loans and leases, net of unearned discount 62,908 72,094                
Residential Limited Documentation [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,199,172 1,462,277                
30-89 Days Past Due 15,690 19,687                
Nonaccrual 126,529 147,170                
Loans and leases, net of unearned discount 1,341,391 1,629,134                
Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 3,548,820 3,881,885                
30-89 Days Past Due 14,712 24,329                
Nonaccrual 71,474 79,392                
Loans and leases, net of unearned discount 3,635,006 3,985,606                
Home Equity Lines and Loans [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 2,384,309 2,569,621                
30-89 Days Past Due   939                
Nonaccrual 768 5,752                
Loans and leases, net of unearned discount 2,385,077 2,576,312                
Home Equity Lines and Loans [Member] | Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,114,426 1,252,185                
30-89 Days Past Due 14,015 22,242                
Nonaccrual 64,580 67,492                
Loans and leases, net of unearned discount 1,193,021 1,341,919                
Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 7,972,125 7,002,643                
30-89 Days Past Due 29,656 47,161                
Nonaccrual 23,907 25,519                
Loans and leases, net of unearned discount 8,025,688 7,075,323                
Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 4,553,306 4,007,349                
30-89 Days Past Due 34,349 55,498                
Nonaccrual 31,002 39,404                
Loans and leases, net of unearned discount 4,618,657 4,102,251                
Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,499,219 1,346,868                
30-89 Days Past Due 9,399 17,561                
Accruing Loans Past Due 90 Days or More 3,106 4,581                
Nonaccrual 43,573 38,231                
Loans and leases, net of unearned discount 1,555,297 1,407,241                
Other [Member] | Revolving Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,038,160 927,217                
30-89 Days Past Due 5,028 10,594                
Accruing Loans Past Due 90 Days or More 2,878 4,207                
Nonaccrual 40,811 35,044                
Loans and leases, net of unearned discount 1,086,877 977,062                
Other [Member] | Revolving Loans Converted to Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,536 1,856                
30-89 Days Past Due 389 481                
Nonaccrual 114 148                
Loans and leases, net of unearned discount 2,039 2,485                
Term Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 14,325,317 20,949,019 $ 13,515,748 $ 15,628,942 $ 13,584,252 $ 10,466,749 $ 8,778,600 $ 7,893,838 $ 6,419,053 $ 6,013,013
Term Loans [Member] | Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 2,027,514 2,722,862 1,742,731 1,416,259 1,158,831 618,736 520,113 1,318,094 1,258,200 718,235
30-89 Days Past Due 16,352 13,496 10,434 7,781 7,322 7,258 5,529 13,477 30,337 7,947
Accruing Loans Past Due 90 Days or More 3,204 579 104,612 15,234 28,394 38,145 35,993 212,818 211,521 45,804
Nonaccrual 1,831 3,133 21,837 14,439 5,988 5,183 4,488 6,408 4,184 2,900
Loans and leases, net of unearned discount 2,048,901 2,740,070 1,879,614 1,453,713 1,200,535 669,322 566,123 1,550,797 1,504,242 774,886
Term Loans [Member] | Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 354 773 863 3,983 3,087 1,591 1,935 2,016 2,055 162
30-89 Days Past Due 16                  
Loans and leases, net of unearned discount 370 773 863 3,983 3,087 1,591 1,935 2,016 2,055 162
Term Loans [Member] | Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 2,468,197 2,796,359 2,248,066 1,751,766 1,369,098 907,595 699,577 630,151 486,354 352,414
30-89 Days Past Due 3,062 9,548 7,028 11,255 6,669 8,519 4,090 6,638 3,657 2,938
Nonaccrual 549 1,854 3,125 3,883 4,371 4,072 4,771 4,194 3,679 2,733
Loans and leases, net of unearned discount 2,471,808 2,807,761 2,258,219 1,766,904 1,380,138 920,186 708,438 640,983 493,690 358,085
Term Loans [Member] | Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,803,922 1,595,636 1,224,901 1,106,782 762,820 629,338 402,919 440,604 258,317 171,017
30-89 Days Past Due 4,356 6,461 5,700 14,140 7,755 12,542 6,921 12,899 5,954 6,373
Nonaccrual 1,182 1,615 2,673 7,144 6,036 10,788 8,289 10,061 7,046 5,991
Loans and leases, net of unearned discount 1,809,460 1,603,712 1,233,274 1,128,066 776,611 652,668 418,129 463,564 271,317 183,381
Term Loans [Member] | Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 185,095 160,424 113,060 137,617 86,349 53,702 30,414 32,556 19,825 4,526
30-89 Days Past Due 2,201 1,879 393 1,130 640 577 204 2,301 85 42
Nonaccrual 1,625 1,493 241 492 236 339 206 183 111 31
Loans and leases, net of unearned discount 188,921 163,796 $ 113,694 $ 139,239 $ 87,225 $ 54,618 $ 30,824 $ 35,040 $ 20,021 $ 4,599
Term Loans Prior Period [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Loans and leases, net of unearned discount 20,870,452 19,233,367                
Term Loans Prior Period [Member] | Residential [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 6,544,178 6,898,756                
30-89 Days Past Due 185,213 150,447                
Accruing Loans Past Due 90 Days or More 561,424 480,308                
Nonaccrual 314,825 333,466                
Loans and leases, net of unearned discount 7,605,640 7,862,977                
Term Loans Prior Period [Member] | Residential Limited Documentation [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 1,199,172 1,462,277                
30-89 Days Past Due 15,690 19,687                
Nonaccrual 126,529 147,170                
Loans and leases, net of unearned discount 1,341,391 1,629,134                
Term Loans Prior Period [Member] | Home Equity Lines and Loans [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 41,791 51,554                
30-89 Days Past Due 681 1,148                
Nonaccrual 6,126 6,148                
Loans and leases, net of unearned discount 48,598 58,850                
Term Loans Prior Period [Member] | Recreational Finance [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 700,833 564,358                
30-89 Days Past Due 5,150 8,263                
Nonaccrual 7,412 8,783                
Loans and leases, net of unearned discount 713,395 581,404                
Term Loans Prior Period [Member] | Automobile [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 100,427 63,972                
30-89 Days Past Due 3,663 3,083                
Nonaccrual 5,776 3,805                
Loans and leases, net of unearned discount 109,866 70,860                
Term Loans Prior Period [Member] | Other [Member]                    
Financing Receivable Recorded Investment [Line Items]                    
Current 24,780 28,970                
30-89 Days Past Due 459 557                
Accruing Loans Past Due 90 Days or More 228 374                
Nonaccrual 229 501                
Loans and leases, net of unearned discount $ 25,696 $ 30,402