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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | $ 11,662,000 | $ 6,953,000
Loans Past Due 90 days or more and Still Accruing | 57,515,000 | 59,452,000
Nonaccrual | 92,965,000 | 83,707,000
Loans held for investment | 12,311,448,000 | 12,185,483,000
PCD loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 8,600,000 | 8,300,000
Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 0 |
Nonaccrual | 19,000,000.0 | 8,000,000.0
Loans held for investment | 2,103,118,000 | 2,022,261,000
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 80,710,000 | 89,185,000
Residential Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,801,587,000 | 2,821,726,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,768,902,000 | 2,789,487,000
Residential Portfolio Segment [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 474,347,000 | 465,720,000
Residential Portfolio Segment [Member] | Florida region [Member} | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 465,876,000 | 458,493,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 1,700,000 | 1,742,000
Loans Past Due 90 days or more and Still Accruing | 10,304,000 | 11,029,000
Nonaccrual | 32,685,000 | 32,239,000
Loans held for investment | 2,701,932,000 | 2,721,490,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,669,247,000 | 2,689,251,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | PCD loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 7,700,000 | 7,400,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 473,646,000 | 464,777,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 465,175,000 | 457,550,000
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] | 30-59 Days Past Due [Member] | Less Than Two Payments In Arrears [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 72,700,000 | 69,900,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 0 | 0
Loans Past Due 90 days or more and Still Accruing | 28,265,000 | 29,312,000
Nonaccrual | 0 | 0
Loans held for investment | 99,655,000 | 100,236,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 99,655,000 | 100,236,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 701,000 | 943,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 701,000 | 943,000
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] | 30-59 Days Past Due [Member] | Less Than Two Payments In Arrears [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 7,400,000 | 8,200,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 8,800,000 | 7,900,000
Residential Portfolio Segment [Member] | Federal Housing Administration Loan [Member] | Past Due, 15 Months Delinquent [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 13,700,000 | 15,400,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 1,644,000 | 1,687,000
Loans Past Due 90 days or more and Still Accruing | 7,829,000 | 8,455,000
Nonaccrual | 25,067,000 | 15,250,000
Loans held for investment | 3,230,995,000 | 3,174,232,000
Commercial Portfolio Segment [Member] | Florida region [Member} | Commercial And Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL |  | 0
Loans held for investment | 940,996,000 | 924,824,000
Commercial Portfolio Segment [Member] | 30-59 Days Past Due [Member] | Commercial And Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 3,134,000 | 1,130,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 6,865,000 | 2,536,000
Loans Past Due 90 days or more and Still Accruing | 939,000 | 1,108,000
Nonaccrual | 11,976,000 | 12,205,000
Loans held for investment | 2,361,731,000 | 2,317,083,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCD loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 900,000 | 900,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 592,484,000 | 526,446,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 708,000 | 17,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Less Than Two Payments In Arrears [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 1,900,000 | 1,100,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 971,000 | 972,000
Loans Past Due 90 days or more and Still Accruing | 2,284,000 | 2,297,000
Nonaccrual | 1,498,000 | 1,569,000
Loans held for investment | 237,288,000 | 214,777,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 89,664,000 | 99,376,000
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

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