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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | $ 6,689,479,000 |  | $ 6,689,479,000 |  |  | $ 4,647,019,000 |  |
Gross Unrealized loss | 65,591,000 |  | 65,591,000 |  |  | 5,517,000 |  |
Allowance for Credit Losse, Available-for-sale securities | 1,157,000 |  | 1,157,000 |  |  | 1,310,000 |  |
Allowance for Credit Losse, Held-to-maturity securities | 8,317,000 |  | 8,317,000 |  |  | 8,845,000 |  |
Debt Securities, Held-to-maturity, Past Due | $ 0 |  | $ 0 |  |  |  |  |
Debt Securities, Held-to-maturity, Threshold Period Past Due | 30 days |  | 30 days |  |  |  |  |
Accrued interest receivable on loans and investments | $ 58,454,000 |  | $ 58,454,000 |  |  | 69,505,000 |  |
Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | 8,300,000 |  | 8,300,000 |  |  | 8,800,000 |  |
Allowance for Credit Losse, Held-to-maturity securities | 8,317,000 | $ 10,176,000 | 8,317,000 | $ 10,176,000 | $ 10,685,000 | 8,845,000 | $ 9,268,000 | $ 0
Held to Maturity Amortized cost | 177,805,000 |  | 177,805,000 |  |  | 189,488,000 |  |
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Held to Maturity Amortized cost | 0 |  | 0 |  |  |  |  |
MBS [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds From Sale Of Available For Sale Securities |  |  |  | 1,100,000 |  |  |  |
Gain on Sale of Investments |  |  |  | 13,400,000 |  |  |  |
Fair value | 4,329,077,000 |  | 4,329,077,000 |  |  | 3,455,796,000 |  |
Gross Unrealized loss | 49,045,000 |  | 49,045,000 |  |  | 3,951,000 |  |
Allowance for Credit Losse, Available-for-sale securities | 849,000 |  | 849,000 |  |  | 1,002,000 |  |
MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | 7,600,000 |  | 7,600,000 |  |  |  |  |
Gross Unrealized loss | 3,100,000 |  | 3,100,000 |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | 800,000 |  | 800,000 |  |  | 1,000,000.0 |  |
Puerto Rico Government obligations [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | 2,900,000 |  | 2,900,000 |  |  |  |  |
Gross Unrealized loss | 800,000 |  | 800,000 |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | $ 300,000 |  | $ 300,000 |  |  |  |  |
Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Percentage Of Debt Securities Government And Government Sponsored Agencies | 99.00% |  | 99.00% |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | $ 1,157,000 | 1,386,000 | $ 1,157,000 | 1,386,000 | 1,166,000 | 1,310,000 | 1,631,000 | 0
Accrued interest receivable on loans and investments | 10,900,000 |  | 10,900,000 |  |  | 8,500,000 |  |
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | 849,000 | 1,078,000 | $ 849,000 | 1,078,000 | 858,000 | 1,002,000 | 1,323,000 | 0
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality, Additional Information |  |  | The underlying collateral is fixed-rate, single-family residential mortgage loans in the United States with original FICO scores over 700 and moderate loan-to-value ratios (under 80%), as well as moderate delinquency levels. |  |  |  |  |
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Description of Variable Rate Basis |  |  | The interest rate on these private-label MBS is variable, tied to 3-month LIBOR and limited to the weighted-average coupon on the underlying collateral. |  |  |  |  |
Available-for-sale Securities [Member] | Puerto Rico Government obligations [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losse, Available-for-sale securities | 308,000 | 308,000 | $ 308,000 | 308,000 | $ 308,000 | 308,000 | $ 308,000 | $ 0
Held-to-maturity Securities [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Accrued interest receivable on loans and investments | 1,700,000 |  | 1,700,000 |  |  | $ 3,600,000 |  |
Held-to-maturity Securities [Member] | Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Provision for Other Credit Losses | $ (2,368,000) | $ (361,000) | $ (528,000) | $ 773,000 |  |  |  |

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