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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Fair value | $ 170,438 |  | $ 173,806 |  |  |
Allowance for Credit Losse, Held-to-maturity securities | 8,317 |  | 8,845 |  |  |
Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Matury Amortized Due Withing One Year | 2,993 |  | 556 |  |  |
Held to Maturity Gross Unrecognized gain Due Within One Year | 8 |  | 7 |  |  |
Held to Maturity Gross Unrecognized losses Due Within One Year | 19 |  | 0 |  |  |
Held to Maturity Fair value Due Within One Year | 2,982 |  | 563 |  |  |
Allowance for credit losses Withing One Year | $ 59 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield Due withing One Year | 5.39% |  | 5.41% |  |  |
Held to Maturity Amortized Cost After 1 to 5 years | $ 14,667 |  | $ 17,297 |  |  |
Held to Maturity Gross Unrecognized gains After 1 to 5 years | 615 |  | 561 |  |  |
Held to Maturity Gross Unrecognized losses After 1 to 5 years | 178 |  | 305 |  |  |
Held to Maturity Fair value After 1 to 5 years | 15,104 |  | 17,553 |  |  |
Allowance for credit losses After 1 to 5 years | $ 268 |  | $ 576 |  |  |
Held to Maturity Weighted-average yield After 1 to 5 years | 2.36% |  | 3.00% |  |  |
Held to Maturity Amortized Cost After 5 to 10 years | $ 90,377 |  | $ 88,394 |  |  |
Held to Maturity Gross Unrecognized gains After 5 to 10 years | 1,939 |  | 1,388 |  |  |
Held to Maturity Gross Unrecognized losses After 5 to 10 year | 1,470 |  | 3,146 |  |  |
Held to Maturity Fair value After 5 to 10 years | 90,846 |  | 86,636 |  |  |
Allowance for credit losses After 5 to 10 years | $ 3,013 |  | $ 4,401 |  |  |
Held to Maturity Weighted-average yield After 5 to 10 years | 4.26% |  | 4.66% |  |  |
Held to Maturity Weighted-average yield | 4.05% |  | 4.03% |  |  |
Held to Maturity Amortized Cost After 10 years | $ 69,768 |  | $ 83,241 |  |  |
Held to Maturity Gross Unrecognized gains After 10 | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 | 8,262 |  | 14,187 |  |  |
Held to Maturity Fair value After 10 years | 61,506 |  | 69,054 |  |  |
Allowance for credit losses After 10 years | $ 4,977 |  | $ 3,868 |  |  |
Held to Maturity Weighted-average yield After 10 years | 4.07% |  | 3.57% |  |  |
Held to Maturity Amortized cost | $ 177,805 |  | $ 189,488 |  |  |
Held to Maturity Gross Unrecognized gains | 2,562 |  | 1,956 |  |  |
Held to Maturity Fair value | 170,438 |  | 173,806 |  |  |
Allowance for Credit Losse, Held-to-maturity securities | 8,317 | $ 10,685 | 8,845 | $ 10,176 | $ 9,268 | $ 0
Held to Maturity Gross Unrecognized losses | $ 9,929 |  | $ 17,638 |  |  |

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