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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]          
Current $ 95,806,020 $ 87,999,720      
30-89 Days Past Due 873,798 1,174,132      
Accruing Loans Past Due 90 Days or More 527,258 518,728      
Nonaccrual 1,239,972 963,112      
Loans and leases, net of unearned discount 98,447,048 90,922,869      
Revolving Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Loans and leases, net of unearned discount 16,208,710        
Revolving Loans Converted to Term Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Loans and leases, net of unearned discount 1,443,245        
Residential [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 13,934,309 12,760,040      
30-89 Days Past Due 185,420 451,274      
Accruing Loans Past Due 90 Days or More 503,450 486,515      
Nonaccrual 297,636 235,663      
Loans and leases, net of unearned discount 14,920,815 14,082,425      
Residential [Member] | Revolving Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 68,834        
Nonaccrual 206        
Loans and leases, net of unearned discount 69,040        
Residential Limited Documentation [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,606,130 1,858,037      
30-89 Days Past Due 20,980 65,215      
Accruing Loans Past Due 90 Days or More   181      
Nonaccrual 115,783 83,427      
Loans and leases, net of unearned discount 1,742,893 2,073,669      
Home Equity Lines and Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 4,000,829 4,386,511      
30-89 Days Past Due 22,209 30,229      
Nonaccrual 78,820 63,215      
Loans and leases, net of unearned discount 4,101,858 4,481,617      
Home Equity Lines and Loans [Member] | Revolving Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 2,622,825        
30-89 Days Past Due 1,374        
Nonaccrual 6,988        
Loans and leases, net of unearned discount 2,631,187        
Home Equity Lines and Loans [Member] | Revolving Loans Converted to Term Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,310,702        
30-89 Days Past Due 18,954        
Nonaccrual 66,742        
Loans and leases, net of unearned discount 1,396,398        
Recreational Finance [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 6,838,126 5,484,997      
30-89 Days Past Due 36,003 36,827      
Nonaccrual 24,191 14,219      
Loans and leases, net of unearned discount 6,898,320 5,536,142      
Automobile [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 3,829,968 3,787,221      
30-89 Days Past Due 42,906 78,478      
Nonaccrual 42,374 21,293      
Loans and leases, net of unearned discount 3,915,248 3,886,992      
Other [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,337,042 1,395,240      
30-89 Days Past Due 11,601 45,978      
Accruing Loans Past Due 90 Days or More 6,974 5,156      
Nonaccrual 38,565 3,512      
Loans and leases, net of unearned discount 1,394,182 1,481,942      
Other [Member] | Revolving Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 908,567        
30-89 Days Past Due 6,954        
Accruing Loans Past Due 90 Days or More 6,687        
Nonaccrual 35,186        
Loans and leases, net of unearned discount 957,394        
Other [Member] | Revolving Loans Converted to Term Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,807        
30-89 Days Past Due 504        
Nonaccrual 299        
Loans and leases, net of unearned discount 2,610        
Term Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Loans and leases, net of unearned discount 18,549,250 15,936,862 $ 11,120,334 $ 8,351,948 $ 6,393,180
Term Loans [Member] | Residential [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 2,089,095 1,489,244 664,588 1,282,631 756,137
30-89 Days Past Due 4,319 8,534 5,234 17,517 6,758
Accruing Loans Past Due 90 Days or More 387 9,213 26,596 124,510 30,048
Nonaccrual 761 4,590 1,653 5,257 1,002
Loans and leases, net of unearned discount 2,094,562 1,511,581 698,071 1,429,915 793,945
Term Loans [Member] | Home Equity Lines and Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 668 4,357 1,961 2,155 163
30-89 Days Past Due     72    
Nonaccrual   20   52  
Loans and leases, net of unearned discount 668 4,377 2,033 2,207 163
Term Loans [Member] | Recreational Finance [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 2,323,314 1,881,732 969,243 674,896 379,441
30-89 Days Past Due 5,130 9,073 6,755 5,091 3,168
Nonaccrual 1,314 3,961 3,790 4,175 2,379
Loans and leases, net of unearned discount 2,329,758 1,894,766 979,788 684,162 384,988
Term Loans [Member] | Automobile [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,084,223 1,223,790 711,515 513,607 208,741
30-89 Days Past Due 2,884 10,573 11,193 10,126 5,170
Nonaccrual 1,244 7,754 11,224 11,010 6,461
Loans and leases, net of unearned discount 1,088,351 1,242,117 733,932 534,743 220,372
Term Loans [Member] | Other [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 132,769 154,094 62,966 39,231 6,252
30-89 Days Past Due 1,874 890 537 243 29
Nonaccrual 1,540 446 442 226 43
Loans and leases, net of unearned discount 136,183 $ 155,430 $ 63,945 $ 39,700 $ 6,324
Term Loans Prior Period [Member]          
Financing Receivable Recorded Investment [Line Items]          
Loans and leases, net of unearned discount 20,443,519        
Term Loans Prior Period [Member] | Residential [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 7,583,780        
30-89 Days Past Due 143,058        
Accruing Loans Past Due 90 Days or More 312,696        
Nonaccrual 284,167        
Loans and leases, net of unearned discount 8,323,701        
Term Loans Prior Period [Member] | Residential Limited Documentation [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 1,606,130        
30-89 Days Past Due 20,980        
Nonaccrual 115,783        
Loans and leases, net of unearned discount 1,742,893        
Term Loans Prior Period [Member] | Home Equity Lines and Loans [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 57,998        
30-89 Days Past Due 1,809        
Nonaccrual 5,018        
Loans and leases, net of unearned discount 64,825        
Term Loans Prior Period [Member] | Recreational Finance [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 609,500        
30-89 Days Past Due 6,786        
Nonaccrual 8,572        
Loans and leases, net of unearned discount 624,858        
Term Loans Prior Period [Member] | Automobile [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 88,092        
30-89 Days Past Due 2,960        
Nonaccrual 4,681        
Loans and leases, net of unearned discount 95,733        
Term Loans Prior Period [Member] | Other [Member]          
Financing Receivable Recorded Investment [Line Items]          
Current 31,356        
30-89 Days Past Due 570        
Accruing Loans Past Due 90 Days or More 287        
Nonaccrual 383        
Loans and leases, net of unearned discount $ 32,596