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DEBT SECURITIES - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Investments [Line Items] |  |  |  |
Investments purchased, classified as available-for-sale debt securities | $ 266,198,000 | $ 5,458,000 | $ 512,327,000 |
Fair value | 4,565,302,000 | 5,229,984,000 |  |
Gross Unrealized Losses | 559,768,000 | 633,049,000 |  |
Available-for-sale, allowance for credit losses | 521,000 | 511,000 |  |
Allowance for credit losses, Held-to-Maturity securities | 802,000 | 2,197,000 |  |
Provision for credit loss expense | (1,445,000) | (6,069,000) | (719,000) |
Debt Securities, Held-to-maturity | 317,786,000 | 354,178,000 |  |
Accrued interest receivable on loans and investments | 71,881,000 | 77,716,000 |  |
Interest income on available for sale debt securities | 71,700,000 | 78,300,000 | 86,100,000 |
Interest income, held to maturity securities | 17,100,000 | 20,900,000 | 15,500,000 |
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 |  |
Puerto Rico government obligations [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Available-for-sale, allowance for credit losses | 300,000 | 400,000 |  |
Residential MBS [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments purchased, classified as available-for-sale debt securities | 224,500,000 |  |  |
Fair value | 2,481,253,000 | 2,633,161,000 |  |
Gross Unrealized Losses | 440,826,000 | 436,055,000 |  |
Available-for-sale, allowance for credit losses | 176,000 | 116,000 |  |
Allowance for credit losses, Held-to-Maturity securities | 0 | 0 |  |
Debt Securities, Held-to-maturity | 129,319,000 | 146,468,000 |  |
Residential MBS [Member] | Private label [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Fair value | 4,195,000 |  |  |
Gross Unrealized Losses | 1,715,000 |  |  |
Available-for-sale, allowance for credit losses | $ 176,000 | 100,000 |  |
Debt Instrument Variable Interest Rate Type Extensible Enumeration | SOFR [Member] |  |  |
Spread on variable rate | 0.26161% |  |  |
Debt Instrument Description Of Variable Rate Basis | 3-month CME Term SOFR |  |  |
Residential MBS [Member] | Private label [Member] | FICO Score, Greater than 700 [Member] | LTV Less than 80 Percent [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Loan To Value Coverage Percentage | 80.00% |  |  |
Residential MBS [Member] | Private label [Member] | SOFR [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Spread on variable rate | 0.26161% |  |  |
MBS And Government Obligations Held By International Banking Entities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Interest income on available for sale debt securities | $ 36,200,000 | 39,100,000 | 40,700,000 |
Interest income, held to maturity securities | 16,800,000 | 20,500,000 | 15,400,000 |
Commercial MBS [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Investments purchased, classified as available-for-sale debt securities | 40,700,000 |  |  |
Fair value | 181,909,000 | 151,618,000 |  |
Gross Unrealized Losses | 41,097,000 | 38,620,000 |  |
Available-for-sale, allowance for credit losses | 0 | 0 |  |
Allowance for credit losses, Held-to-Maturity securities | 0 | 0 |  |
Debt Securities, Held-to-maturity | 96,025,000 | 100,670,000 |  |
Available-for-Sale Securities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Available-for-sale, allowance for credit losses | 521,000 | 511,000 | 458,000 | $ 1,105,000
Provision For Other Credit Losses Previous Expected Credit Losses | 50,000 | (20,000) | 434,000 |
Charge-offs | (60,000) | (33,000) | 213,000 |
Accrued interest receivable on loans and investments | 9,600,000 | 10,600,000 |  |
Available-for-Sale Securities [Member] | Puerto Rico government obligations [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Available-for-sale, allowance for credit losses | 345,000 | 395,000 | 375,000 | 308,000
Provision For Other Credit Losses Previous Expected Credit Losses | 50,000 | (20,000) | (67,000) |
Charge-offs | 0 | 0 | 0 |
Available-for-Sale Securities [Member] | Residential MBS [Member] | Private label [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Available-for-sale, allowance for credit losses | 176,000 | 116,000 | 83,000 | $ 797,000
Provision For Other Credit Losses Previous Expected Credit Losses | 0 | 0 | 501,000 |
Charge-offs | (60,000) | (33,000) | $ 213,000 |
Held-to-Maturity Securities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Accrued interest receivable on loans and investments | $ 4,100,000 | $ 4,800,000 |  |

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