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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Loans held for investment $ 11,577,985 $ 11,552,825
Nonaccrual Loans with No ACL 24,574 25,026
Loans Past Due 90 days or more and Still Accruing 74,380 80,283
Financing Receivable, Nonaccrual 89,142 89,935
Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 11,319,958 11,277,708
30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 54,822 58,718
60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 39,683 46,181
Residential Portfolio Segment [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,811,528 2,847,290
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,699,959 2,729,132
Nonaccrual Loans with No ACL 2,250 2,292
Loans Past Due 90 days or more and Still Accruing 13,640 16,821
Financing Receivable, Nonaccrual 36,410 42,772
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,626,542 2,643,909
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 0 0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 23,367 25,630
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 111,569 118,158
Nonaccrual Loans with No ACL 0 0
Loans Past Due 90 days or more and Still Accruing 41,723 48,456
Financing Receivable, Nonaccrual 0 0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 67,977 67,116
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 0 0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,869 2,586
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,862,189 2,886,263
Nonaccrual Loans with No ACL 1,858 3,300
Loans Past Due 90 days or more and Still Accruing 6,355 6,332
Financing Receivable, Nonaccrual 13,404 7,830
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,840,568 2,868,989
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,438 1,984
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 424 1,128
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,353,659 2,358,851
Nonaccrual Loans with No ACL 15,787 15,991
Loans Past Due 90 days or more and Still Accruing 7,929 3,771
Financing Receivable, Nonaccrual 21,598 22,319
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,323,116 2,330,094
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 509 300
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 507 2,367
Commercial Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 143,664 132,953
Nonaccrual Loans with No ACL 972 977
Loans Past Due 90 days or more and Still Accruing 0 128
Financing Receivable, Nonaccrual 1,794 2,208
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 141,870 130,617
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 0 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 0 0
Consumer Portfolio Segment [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 3,406,945 3,327,468
Consumer Portfolio Segment [Member] | Auto loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,832,865 1,798,071
Nonaccrual Loans with No ACL 3,342 2,136
Loans Past Due 90 days or more and Still Accruing 0 0
Financing Receivable, Nonaccrual 11,138 10,672
Consumer Portfolio Segment [Member] | Auto loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,780,593 1,740,271
Consumer Portfolio Segment [Member] | Auto loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 34,754 40,039
Consumer Portfolio Segment [Member] | Auto loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 6,380 7,089
Consumer Portfolio Segment [Member] | Finance Leases [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 755,482 718,230
Nonaccrual Loans with No ACL 344 330
Loans Past Due 90 days or more and Still Accruing 0 0
Financing Receivable, Nonaccrual 2,208 1,645
Consumer Portfolio Segment [Member] | Finance Leases [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 743,656 707,646
Consumer Portfolio Segment [Member] | Finance Leases [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 8,056 7,148
Consumer Portfolio Segment [Member] | Finance Leases [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,562 1,791
Consumer Portfolio Segment [Member] | Personal Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 360,735 353,246
Nonaccrual Loans with No ACL 0 0
Loans Past Due 90 days or more and Still Accruing 0 0
Financing Receivable, Nonaccrual 1,263 1,248
Consumer Portfolio Segment [Member] | Personal Loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 353,214 346,366
Consumer Portfolio Segment [Member] | Personal Loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 4,160 3,738
Consumer Portfolio Segment [Member] | Personal Loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,098 1,894
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 310,627 311,731
Nonaccrual Loans with No ACL 0 0
Loans Past Due 90 days or more and Still Accruing 4,733 4,775
Financing Receivable, Nonaccrual 0 0
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 299,387 301,013
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 3,989 3,705
Consumer Portfolio Segment [Member] | Credit Card Receivables [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,518 2,238
Consumer Portfolio Segment [Member] | Other Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 147,236 146,190
Nonaccrual Loans with No ACL 21 0
Loans Past Due 90 days or more and Still Accruing 0 0
Financing Receivable, Nonaccrual 1,327 1,241
Consumer Portfolio Segment [Member] | Other Loans [Member] | Current [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 143,035 141,687
Consumer Portfolio Segment [Member] | Other Loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,916 1,804
Consumer Portfolio Segment [Member] | Other Loans [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment $ 958 $ 1,458