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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | $ 377,553,000 | $ 498,303,000
Financing Receivable, before Allowance for Credit Loss | 11,140,582,000 | 11,777,289,000
Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 362,191,000 | 477,726,000
Financing Receivable, before Allowance for Credit Loss | 9,150,483,000 | 9,788,106,000
Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 15,362,000 | 20,577,000
Financing Receivable, before Allowance for Credit Loss | 1,990,099,000 | 1,989,183,000
30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 52,176,000 | 48,129,000
30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 48,369,000 | 47,143,000
30-59 Days Past Due [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 3,807,000 | 986,000
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,806,145,000 | 2,609,643,000
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,788,334,000 | 2,582,932,000
Consumer Portfolio Segment [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 17,811,000 | $ 26,711,000
Consumer Portfolio Segment [Member] | Credit Card [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Threshold Period Past Due, Writeoff | 180 days | 180 days
Consumer Portfolio Segment [Member] | Credit Card [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Threshold Period Past Due, Writeoff | 180 days | 180 days
Residential Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,095,015,000 | $ 3,521,954,000
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,641,163,000 | 3,002,203,000
Residential Portfolio Segment [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 453,852,000 | 519,751,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 125,431,000 | 228,478,000
Financing Receivable, before Allowance for Credit Loss | 2,960,730,000 | 3,371,220,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 115,520,000 | 210,819,000
Financing Receivable, before Allowance for Credit Loss | 2,507,751,000 | 2,852,639,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 9,911,000 | 17,659,000
Financing Receivable, before Allowance for Credit Loss | 452,979,000 | 518,581,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 69,600,000 | 111,800,000
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, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 64,700,000 | 105,200,000
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, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | $ 4,900,000 | $ 6,600,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest | 15 months | 15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing | $ 52,500,000 | $ 57,900,000
Financing Receivable, Past Due | 79,429,000 | 101,466,000
Financing Receivable, before Allowance for Credit Loss | $ 134,285,000 | $ 150,734,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest | 15 months | 15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing | $ 52,500,000 | $ 57,900,000
Financing Receivable, Past Due | 79,179,000 | 101,216,000
Financing Receivable, before Allowance for Credit Loss | $ 133,412,000 | $ 149,564,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest | 15 months | 15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing | $ 0 | $ 0
Financing Receivable, Past Due | 250,000 | 250,000
Financing Receivable, before Allowance for Credit Loss | 873,000 | 1,170,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 5,000,000.0 | 6,100,000
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, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 5,000,000.0 | 5,900,000
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, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss |  | 200,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 8,500,000 | 10,700,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 8,500,000 | 10,700,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 55,519,000 | 44,522,000
Financing Receivable, before Allowance for Credit Loss | 2,136,502,000 | 2,230,602,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 55,519,000 | 44,522,000
Financing Receivable, before Allowance for Credit Loss | 1,709,298,000 | 1,853,224,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 427,204,000 | 377,378,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 6,314,000 | 5,071,000
Financing Receivable, before Allowance for Credit Loss | 8,300,000 | 5,000,000.0
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, Past Due | 6,314,000 | 5,071,000
Financing Receivable, before Allowance for Credit Loss | 8,300,000 | 5,000,000.0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 6,203,000 | 12,990,000
Financing Receivable, before Allowance for Credit Loss | 170,208,000 | 212,500,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 6,203,000 | 12,990,000
Financing Receivable, before Allowance for Credit Loss | 50,137,000 | 85,016,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 120,071,000 | 127,484,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,400,000 | 100,000
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, Past Due | 0 | 0
Financing Receivable, before Allowance for Credit Loss | 1,400,000 | 100,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | $ 0 | $ 0

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