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DEBT SECURITIES - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Schedule Of Investments [Line Items] |  |  |  |  |  |
Proceeds from sales of available-for-sale debt securities |  | $ 0 | $ 0 | $ 1,195,250,000 |  |
Available-for-sale realized gains |  |  |  | 13,300,000 |  |
Available-for-sale gross realized losses |  |  |  | 100,000 |  |
Available-for-sale net gain |  |  |  | 13,200,000 |  |
Fair value |  | 5,599,520,000 | 6,453,761,000 |  |  |
Gross Unrealized Losses |  | 798,466,000 | 108,537,000 |  |  |
Available-for-sale, allowance for credit losses |  | 458,000 | 1,105,000 |  |  |
Allowance for credit losses, Held-to-Maturity securities |  | 8,286,000 | 8,571,000 |  |  |
Debt Securities, Held-to-maturity |  | 437,537,000 | 178,133,000 |  |  |
Interest Receivable |  | 69,730,000 | 61,507,000 |  |  |
Securities Held To Maturity, Purchased |  | 289,900,000 |  |  |  |
Interest income on available for sale debt securities |  | 86,100,000 | 62,700,000 | 49,000,000.0 |  |
Interest income, held to maturity securities |  | 15,500,000 | 8,800,000 | 7,600,000 |  |
Held to maturity securities classified as cash and cash equivalents |  | 0 | 0 |  |  |
Past Due [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Debt Securities, Held-to-maturity |  | 0 | 0 |  |  |
Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Allowance for credit losses, Held-to-Maturity securities |  | 8,286,000 | 8,571,000 | 8,845,000 |  | $ 0
Initial allowance on PCD debt securities | $ 1,269,000 | 0 | 0 |  |  |
Provision for credit loss expense |  | (285,000) | (274,000) | (558,000) |  |
Debt Securities, Held-to-maturity |  | 165,710,000 |  |  |  |
Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease |  | 300,000 |  |  |  |
Municipal Bonds [Member] | Puerto Rico [Member] | ASC 326 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Allowance for credit losses, Held-to-Maturity securities |  |  | 0 | 0 | $ 8,134,000 |
Puerto Rico government obligations [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, allowance for credit losses |  | 400,000 | 300,000 |  |  |
MBS [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Fair value |  | 3,104,591,000 | 4,044,443,000 |  |  |
Gross Unrealized Losses |  | 548,297,000 | 66,477,000 |  |  |
Available-for-sale, allowance for credit losses |  | 83,000 | 797,000 |  |  |
Allowance for credit losses, Held-to-Maturity securities |  | 0 |  |  |  |
Debt Securities, Held-to-maturity |  | 271,827,000 |  |  |  |
MBS And Government Obligations Held By International Banking Entities [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Interest income on available for sale debt securities |  | 40,700,000 | 25,700,000 | 38,500,000 |  |
Interest income, held to maturity securities |  | 15,400,000 | 8,800,000 | 7,600,000 |  |
Residential Pass-Through Mortgage Backed Securities Issued By PRHFA [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Fair value |  | 2,200,000 |  |  |  |
Gross Unrealized Losses |  | 1,100,000 |  |  |  |
Provision For Other Credit Losses No Previous Expected Credit Losses |  | 400,000 |  |  |  |
Available-for-sale Securities [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, allowance for credit losses |  | 458,000 | 1,105,000 | 1,310,000 |  | 0
Provision For Other Credit Losses Previous Expected Credit Losses |  | 434,000 | 136,000 | (1,641,000) |  |
Charge-offs |  | 213,000 | 69,000 | 331,000 |  |
Available-for-sale Securities [Member] | Puerto Rico government obligations [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, allowance for credit losses |  | 375,000 | 308,000 | 308,000 |  | 0
Provision For Other Credit Losses Previous Expected Credit Losses |  | (67,000) | 0 | (308,000) |  |
Charge-offs |  | 0 | 0 | 0 |  |
Available-for-sale Securities [Member] | MBS [Member] | Private label [Member] |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Available-for-sale, allowance for credit losses |  | 83,000 | 797,000 | 1,002,000 |  | $ 0
Provision For Other Credit Losses Previous Expected Credit Losses |  | 501,000 | 136,000 | (1,333,000) |  |
Charge-offs |  | $ 213,000 | $ 69,000 | $ 331,000 |  |
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. |  |  |  |

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Data Type: | na
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