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LOANS HELD FOR INVESTMENT - Corporation's nonaccrual status and loans 90 days or more still accruing (Parenthetical) (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 11,140,582 |  | $ 11,777,289
Financing Receivable, 90 Days or More Past Due, Still Accruing | 148,082 |  | 145,095
Puerto Rico and Virgin Islands regions [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 9,150,483 |  | 9,788,106
Financing Receivable, 90 Days or More Past Due, Still Accruing | 147,832 |  | 144,845
Florida region [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,990,099 |  | 1,989,183
Financing Receivable, 90 Days or More Past Due, Still Accruing | 250 |  | 250
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,095,015 |  | 3,521,954
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,641,163 |  | 3,002,203
Residential Portfolio Segment [Member] | Florida region [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 453,852 |  | 519,751
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 8,500 |  | 10,700
Financing Receivable, Purchase | 400 | $ 55,000 |
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, 90 Days or More Past Due, Still Accruing | 8,500 |  | 10,700
Financing Receivable, Purchase | 400 |  |
PCD loans [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 120,700 |  | 130,900
PCD loans [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 120,700 |  | 130,900
Accrual Status [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | 375,700 |  | 393,300
Accrual Status [Member] | Puerto Rico and Virgin Islands regions [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | 369,900 |  | 386,700
Accrual Status [Member] | Florida region [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Financing Receivable, Troubled Debt Restructuring | $ 5,800 |  | $ 6,600

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