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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 11,097,705,000	$ 11,060,658,000
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,155,295,000	9,113,918,000
Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,942,410,000	1,946,740,000
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	46,521,000
30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	45,902,000	43,709,000
30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	619,000	493,000
Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,773,152,000
Current [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	8,838,283,000	8,809,393,000
Current [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,934,869,000	1,935,537,000
Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	324,553,000
Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	317,012,000	304,525,000
Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,541,000	11,203,000
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,891,699,000	2,978,895,000
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,487,093,000	2,549,573,000
Residential Portfolio Segment [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	404,606,000	429,322,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,770,689,000	2,853,503,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,366,819,000	2,424,921,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	403,870,000	428,582,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,667,405,000	2,738,111,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Current [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,269,154,000	2,318,789,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Current [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	398,251,000	419,322,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	103,284,000	115,392,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	97,665,000	106,132,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,619,000	9,260,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less Than Two Payments In Arrears [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	61,700,000	66,000,000.0
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less Than Two Payments In Arrears [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	54,000,000.0	63,100,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Less Than Two Payments In Arrears [Member] | 30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	7,700,000	2,900,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	121,010,000	125,392,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	120,274,000	124,652,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	736,000	740,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due, 15 Months Delinquent [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	38,700,000	46,600,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due, 15 Months Delinquent [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	38,600,000	46,600,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due, 15 Months Delinquent [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	100,000	0
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	60,891,000	57,522,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Current [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	60,276,000	56,903,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Current [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	615,000	619,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	60,119,000	67,870,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	59,998,000	67,749,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	121,000	121,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Less Than Two Payments In Arrears [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,900,000	6,100,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Less Than Two Payments In Arrears [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,900,000	6,100,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,500,000	7,200,000
Residential Portfolio Segment [Member] | GNMA [Member] | Unconditional Option To Repurchase [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,500,000	7,200,000
Residential Portfolio Segment [Member] | GNMA [Member] | Unconditional Option To Repurchase [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,500,000	7,200,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,237,702,000	2,167,469,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,733,857,000	1,702,231,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	503,845,000	465,238,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,017,000	2,402,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,017,000	2,402,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,180,246,000	2,129,375,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Current [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,676,401,000	1,664,137,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Current [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	503,845,000	465,238,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	57,456,000	38,094,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	57,456,000	38,094,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	111,908,000	138,999,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	45,420,000	43,133,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	66,488,000	95,866,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	63,000	18,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	63,000	18,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Current [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	107,033,000	136,317,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Current [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	40,545,000	40,451,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Current [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	66,488,000	95,866,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,875,000	2,682,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,875,000	2,682,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Past Due [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	0	0
Commercial Portfolio Segment [Member] | Less Than Two Payments In Arrears [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	900,000	700,000
Commercial Portfolio Segment [Member] | Less Than Two Payments In Arrears [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	900,000	700,000
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,976,140,000	2,888,044,000
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,961,999,000	2,872,384,000
Consumer Portfolio Segment [Member] | Florida region [Member}
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 14,141,000	$ 15,660,000

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