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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans with No ACL $ 19,176,000 $ 10,199,000
Loans Past Due 90 days or more and Still Accruing 37,048,000 42,390,000
Nonaccrual 98,461,000 87,467,000
Loans held for investment 12,675,398,000 12,746,556,000
PCD Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Loans Past Due 90 days or more and Still Accruing 5,700,000 6,200,000
Florida region [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans with No ACL   0
Nonaccrual 21,400,000 8,600,000
Loans held for investment 2,340,198,000 2,294,950,000
30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 80,334,000 93,171,000
Residential Portfolio Segment [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,837,846,000 2,828,431,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 2,807,053,000 2,796,482,000
Residential Portfolio Segment [Member] | Florida region [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual 8,900,000 8,500,000
Loans held for investment 503,193,000 505,226,000
Residential Portfolio Segment [Member] | Florida region [Member] | Performing Financial Instruments [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 494,301,000 496,686,000
Residential Portfolio Segment [Member] | Conventional Residential Mortgage 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 7,053,000 7,404,000
Nonaccrual 30,793,000 31,949,000
Loans held for investment 2,745,963,000 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 2,715,170,000 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 4,800,000 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 502,073,000 504,098,000
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 493,181,000 495,558,000
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 57,300,000 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 17,569,000 18,816,000
Nonaccrual 0 0
Loans held for investment 91,883,000 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 91,883,000 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 1,120,000 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 1,120,000 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 7,100,000 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 6,400,000 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 6,800,000 8,000,000.0
Commercial Portfolio Segment [Member] | Florida region [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual 12,500,000  
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 1,356,000 1,365,000
Loans held for investment 234,441,000 228,396,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 40,650,000 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] | Commercial and Industrial Sector [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans with No ACL 845,000 1,189,000
Loans Past Due 90 days or more and Still Accruing 3,893,000 6,895,000
Nonaccrual 20,344,000 20,514,000
Loans held for investment 3,359,868,000 3,366,038,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Florida region [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 1,070,590,000 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 2,169,000 1,589,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Nonaccrual Loans with No ACL 14,602,000 6,732,000
Loans Past Due 90 days or more and Still Accruing 1,045,000 907,000
Nonaccrual 23,155,000 10,851,000
Loans held for investment 2,501,689,000 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 12,500,000  
Loans held for investment 720,287,000 698,090,000
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Past Due [Line Items]    
Loans held for investment 292,000 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 $ 1,300,000 $ 1,000,000.0