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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule Of Investments [Line Items] |  |  |  |
Debt Securities, Held-to-maturity | $ 437,537 | $ 178,133 |  |
Interest Receivable | 69,730 | 61,507 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 8,286 | 8,571 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 458 | 1,105 |  |
Investment securities available for sale | 5,599,520 | 6,453,761 |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 400 | 300 |  |
Available-for-sale Securities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 458 | 1,105 | $ 1,310 | $ 0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 375 | 308 | 308 | 0
Municipal Bonds [Member] | PUERTO RICO |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Debt Securities, Held-to-maturity | 165,710 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 8,286 | $ 8,571 | $ 8,845 | $ 0

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