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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	$ 11,335,000	$ 6,953,000
Loans Past Due 90 days or more and Still Accruing	43,610,000	59,452,000
Nonaccrual	89,344,000	83,707,000
Loans held for investment	12,446,024,000	12,185,483,000
PCD loans [Member]
Financing Receivable, Past Due [Line Items]
Loans Past Due 90 days or more and Still Accruing	6,500,000	8,300,000
Florida region [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	0	0
Nonaccrual	9,300,000	8,000,000.0
Loans held for investment	2,168,289,000	2,022,261,000
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	88,698,000	89,185,000
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	2,820,147,000	2,821,726,000
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	2,788,418,000	2,789,487,000
Residential Portfolio Segment [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	492,469,000	465,720,000
Residential Portfolio Segment [Member] | Florida region [Member] | Performing Financial Instruments [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	483,221,000	458,493,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	1,571,000	1,742,000
Loans Past Due 90 days or more and Still Accruing	7,712,000	11,029,000
Nonaccrual	31,729,000	32,239,000
Loans held for investment	2,725,690,000	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	2,693,961,000	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	5,600,000	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	491,785,000	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	482,537,000	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	60,600,000	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	20,209,000	29,312,000
Nonaccrual	0	0
Loans held for investment	94,457,000	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	94,457,000	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	684,000	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	684,000	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	8,700,000	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	6,600,000	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	9,000,000.0	15,400,000
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	970,000	972,000
Loans Past Due 90 days or more and Still Accruing	0	2,297,000
Nonaccrual	4,651,000	1,569,000
Loans held for investment	207,342,000	214,777,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	31,989,000	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
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	1,525,000	1,687,000
Loans Past Due 90 days or more and Still Accruing	7,476,000	8,455,000
Nonaccrual	18,362,000	15,250,000
Loans held for investment	3,205,313,000	3,174,232,000
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	961,683,000	924,824,000
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	5,362,000	1,130,000
Commercial Portfolio Segment [Member] | Mortgage loans [Member]
Financing Receivable, Past Due [Line Items]
Nonaccrual Loans with No ACL	6,764,000	2,536,000
Loans Past Due 90 days or more and Still Accruing	910,000	1,108,000
Nonaccrual	11,496,000	12,205,000
Loans held for investment	2,471,880,000	2,317,083,000
Commercial Portfolio Segment [Member] | 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] | Mortgage loans [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	674,547,000	526,446,000
Commercial Portfolio Segment [Member] | Mortgage loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Loans held for investment	1,381,000	17,000
Commercial Portfolio Segment [Member] | 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	$ 2,100,000	$ 1,100,000

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