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DEBT SECURITIES - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | $ 5,668,689,000 |  | $ 5,668,689,000 |  |  | $ 6,453,761,000 |  |
Gross Unrealized Loss | 858,729,000 |  | 858,729,000 |  |  | 108,537,000 |  |
Available-for-sale, allowance for credit losses | 664,000 |  | 664,000 |  |  | 1,105,000 |  |
Allowance for credit losses, Held-to-Maturity securities | 8,257,000 |  | 8,257,000 |  |  | 8,571,000 |  |
Debt Securities, Held-to-maturity | $ 445,862,000 |  | $ 445,862,000 |  |  |  |  |
Debt Securities, Held-to-maturity, Threshold Period Past Due | 30 days |  | 30 days |  |  |  |  |
Interest Receivable | $ 61,108,000 |  | $ 61,108,000 |  |  | 61,507,000 |  |
Securities Held To Maturity, Purchased | 289,900,000 |  |  |  |  |  |  |
Past Due [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Debt Securities, Held-to-maturity | 0 |  | 0 |  |  | 0 |  |
Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Available-for-sale, allowance for credit losses | 8,300,000 |  | 8,300,000 |  |  | 8,600,000 |  |
Allowance for credit losses, Held-to-Maturity securities | 8,257,000 |  | 8,257,000 |  |  | 8,571,000 |  |
Debt Securities, Held-to-maturity | 165,386,000 |  | 165,386,000 |  |  | 178,133,000 |  |
Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease |  |  | 300,000 |  |  |  |  |
Puerto Rico government obligations [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | 2,200,000 |  | 2,200,000 |  |  |  |  |
Gross Unrealized Loss | 1,200,000 |  | 1,200,000 |  |  |  |  |
Available-for-sale, allowance for credit losses | 400,000 |  | 400,000 |  |  |  |  |
MBS [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | 3,191,719,000 |  | 3,191,719,000 |  |  | 4,044,443,000 |  |
Gross Unrealized Loss | 589,639,000 |  | 589,639,000 |  |  | 66,477,000 |  |
Available-for-sale, allowance for credit losses | 290,000 |  | 290,000 |  |  | 797,000 |  |
Allowance for credit losses, Held-to-Maturity securities | 0 |  | 0 |  |  |  |  |
Debt Securities, Held-to-maturity | 280,476,000 |  | 280,476,000 |  |  |  |  |
MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Fair value | 6,200,000 |  | 6,200,000 |  |  |  |  |
Gross Unrealized Loss | 2,400,000 |  | 2,400,000 |  |  |  |  |
Available-for-sale, allowance for credit losses | 300,000 |  | 300,000 |  |  | 800,000 |  |
Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Available-for-sale, allowance for credit losses | 664,000 | $ 1,157,000 | 664,000 | $ 1,157,000 | $ 676,000 | 1,105,000 | $ 1,166,000 | $ 1,310,000
Provision For Other Credit Losses Previous Expected Credit Losses | 12,000 | 9,000 | 435,000 | 136,000 |  |  |  |
Charge-offs |  |  | 6,000 | 17,000 |  |  |  |
Available-for-sale Securities [Member] | Puerto Rico government obligations [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Available-for-sale, allowance for credit losses | 374,000 | 308,000 | 374,000 | 308,000 | 386,000 | 308,000 | 308,000 | 308,000
Provision For Other Credit Losses Previous Expected Credit Losses | 12,000 | 0 | (66,000) | 0 |  |  |  |
Charge-offs |  |  | 0 | 0 |  |  |  |
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Available-for-sale, allowance for credit losses | 290,000 | 849,000 | 290,000 | 849,000 | 290,000 | 797,000 | 858,000 | 1,002,000
Provision For Other Credit Losses Previous Expected Credit Losses | 0 | 9,000 | 501,000 | 136,000 |  |  |  |
Charge-offs |  |  | $ 6,000 | 17,000 |  |  |  |
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] | London Interbank Offered Rate (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. |  |  |  |  |
Held-to-maturity Securities [Member] | Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses, Held-to-Maturity securities | 8,257,000 | 8,317,000 | $ 8,257,000 | 8,317,000 | $ 8,885,000 | $ 8,571,000 | $ 10,685,000 | $ 8,845,000
Provision for credit loss expense | $ (628,000) | $ (2,368,000) | $ (314,000) | $ (528,000) |  |  |  |

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