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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | $ 30,885,000 | $ 10,199,000
Loans Past Due 90 days or more and Still Accruing | 28,891,000 | 42,390,000
Nonaccrual | 96,261,000 | 87,467,000
Loans held for investment | 13,048,684,000 | 12,746,556,000
PCD Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Past Due 90 days or more and Still Accruing | 5,000,000.0 | 6,200,000
Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL |  | 0
Nonaccrual | 22,700,000 | 8,600,000
Loans held for investment | 2,499,469,000 | 2,294,950,000
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 94,395,000 | 93,171,000
Residential Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,889,081,000 | 2,828,431,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,860,215,000 | 2,796,482,000
Residential Portfolio Segment [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 10,300,000 | 8,500,000
Loans held for investment | 522,063,000 | 505,226,000
Residential Portfolio Segment [Member] | Florida region [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 511,814,000 | 496,686,000
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 121,000 | 0
Loans Past Due 90 days or more and Still Accruing | 6,096,000 | 7,404,000
Nonaccrual | 28,866,000 | 31,949,000
Loans held for investment | 2,800,832,000 | 2,736,179,000
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 2,771,966,000 | 2,704,230,000
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 | 4,100,000 | 5,300,000
Residential Portfolio Segment [Member] | Conventional Residential Mortgage Loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 520,969,000 | 504,098,000
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 | 510,720,000 | 495,558,000
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 | 63,000,000.0 | 65,600,000
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 | 13,186,000 | 18,816,000
Nonaccrual | 0 | 0
Loans held for investment | 88,249,000 | 92,252,000
Residential Portfolio Segment [Member] | FHA/VA Government-Guaranteed Loans [Member] | Performing Financial Instruments [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 88,249,000 | 92,252,000
Residential Portfolio Segment [Member] | FHA/VA Government-Guaranteed Loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 1,094,000 | 1,128,000
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 | 1,094,000 | 1,128,000
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 | 8,600,000 | 8,800,000
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 | 3,800,000 | 5,700,000
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 | 5,000,000.0 | 8,000,000.0
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 956,000 | 968,000
Loans Past Due 90 days or more and Still Accruing | 0 | 0
Nonaccrual | 5,591,000 | 1,365,000
Loans held for investment | 259,863,000 | 228,396,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 24,550,000 | 43,969,000
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
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 |
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 15,513,000 | 1,189,000
Loans Past Due 90 days or more and Still Accruing | 2,970,000 | 6,895,000
Nonaccrual | 19,650,000 | 20,514,000
Loans held for investment | 3,614,241,000 | 3,366,038,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 200,000 |
Loans held for investment | 1,162,825,000 | 1,040,163,000
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 | 9,019,000 | 1,589,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 13,288,000 | 6,732,000
Loans Past Due 90 days or more and Still Accruing | 875,000 | 907,000
Nonaccrual | 21,437,000 | 10,851,000
Loans held for investment | 2,549,375,000 | 2,565,984,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [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] | Commercial Mortgage Loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual Loans with No ACL | 12,200,000 |
Nonaccrual | 12,200,000 |
Loans held for investment | 784,194,000 | 698,090,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans held for investment | 0 | 0
Commercial Portfolio Segment [Member] | Commercial 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 | $ 1,900,000 | $ 1,000,000.0

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