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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | $ 9,967,000 | $ 25,026,000
Loans Past Due 90 days or more and Still Accruing | 62,892,000 | 80,283,000
Nonaccrual | 93,164,000 | 89,935,000
Loans held for investment | 11,950,932,000 | 11,552,825,000
PCD loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 8,900,000 | 12,000,000.0
Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 0 |
Nonaccrual | 8,700,000 | 8,300,000
Loans held for investment | 2,044,643,000 | 2,088,351,000
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 79,051,000 | 58,718,000
Residential Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,812,631,000 | 2,847,290,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,780,685,000 | 2,804,518,000
Residential Portfolio Segment [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 458,952,000 | 429,390,000
Residential Portfolio Segment [Member] | Florida region [Member} | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 452,255,000 | 422,089,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 1,910,000 | 2,292,000
Loans Past Due 90 days or more and Still Accruing | 11,958,000 | 16,821,000
Nonaccrual | 31,946,000 | 42,772,000
Loans held for investment | 2,708,535,000 | 2,729,132,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,676,589,000 | 2,686,360,000
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 | 8,000,000.0 | 11,000,000.0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 457,988,000 | 428,648,000
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 | 451,291,000 | 421,347,000
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 | 65,500,000 | 65,200,000
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 | 32,167,000 | 48,456,000
Nonaccrual | 0 | 0
Loans held for investment | 104,096,000 | 118,158,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 104,096,000 | 118,158,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 964,000 | 742,000
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 | 964,000 | 742,000
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 | 6,900,000 | 6,100,000
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 | 8,500,000 | 10,300,000
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 | 17,400,000 | 28,200,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 1,523,000 | 3,300,000
Loans Past Due 90 days or more and Still Accruing | 10,749,000 | 6,332,000
Nonaccrual | 18,809,000 | 7,830,000
Loans held for investment | 3,030,954,000 | 2,886,263,000
Commercial Portfolio Segment [Member] | Florida region [Member} | Commercial And Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL |  | 300,000
Loans held for investment | 942,680,000 | 1,026,154,000
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 | 441,000 | 1,984,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 5,458,000 | 15,991,000
Loans Past Due 90 days or more and Still Accruing | 2,373,000 | 3,771,000
Nonaccrual | 21,632,000 | 22,319,000
Loans held for investment | 2,316,113,000 | 2,358,851,000
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 | 1,000,000.0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 536,105,000 | 524,647,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 930,000 | 300,000
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 | 1,000,000.0 | 1,600,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 973,000 | 977,000
Loans Past Due 90 days or more and Still Accruing | 7,000 | 128,000
Nonaccrual | 1,640,000 | 2,208,000
Loans held for investment | 202,774,000 | 132,953,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member} |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 100,447,000 | 98,181,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 1,834,000 | $ 0
Commercial Portfolio Segment [Member] | Construction 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 | $ 100,000 |

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