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DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 458,227,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains | 3,449,000 |  |  |  |  |
Held to Maturity Gross Unrecognized losses | 8,434,000 |  |  |  |  |
Held to Maturity Fair value | 453,242,000 |  | $ 167,147,000 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 8,885,000 |  | 8,571,000 |  |  |
Held to Maturity Weighted-average yield | 3.68% |  |  |  |  |
Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 279,812,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains | 334,000 |  |  |  |  |
Held to Maturity Gross Unrecognized losses | 1,923,000 |  |  |  |  |
Held to Maturity Fair value | 278,223,000 |  |  |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield | 3.23% |  |  |  |  |
Municipal Bonds [Member] | Puerto Rico [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Matury Amortized Due Withing One Year | $ 595,000 |  | 2,995,000 |  |  |
Held to Maturity Gross Unrecognized gain Due Within One Year | 0 |  | 5,000 |  |  |
Held to Maturity Gross Unrecognized losses Due Within One Year | 0 |  | 0 |  |  |
Held to Maturity Fair value Due Within One Year | 595,000 |  | 3,000,000 |  |  |
Allowance for credit losses Due within one year | $ 1,000 |  | $ 70,000 |  |  |
Held to Maturity Weighted-average yield Due withing One Year | 5.45% |  | 5.39% |  |  |
Held to Maturity Amortized Cost After 1 to 5 years | $ 15,021,000 |  | $ 14,785,000 |  |  |
Held to Maturity Gross Unrecognized gains After 1 to 5 years | 658,000 |  | 526,000 |  |  |
Held to Maturity Gross Unrecognized losses After 1 to 5 years | 44,000 |  | 156,000 |  |  |
Held to Maturity Fair value After 1 to 5 years | 15,635,000 |  | 15,155,000 |  |  |
Allowance for credit losses After 1 to 5 years | $ 175,000 |  | $ 347,000 |  |  |
Held to Maturity Weighted-average yield After 1 to 5 years | 2.98% |  | 2.35% |  |  |
Held to Maturity Amortized Cost After 5 to 10 years | $ 93,031,000 |  | $ 90,584,000 |  |  |
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss | 2,457,000 |  | 1,555,000 |  |  |
Held to Maturity Gross Unrecognized losses After 5 to 10 years | 2,286,000 |  | 3,139,000 |  |  |
Held to Maturity Fair value After 5 to 10 years | 93,202,000 |  | 89,000,000 |  |  |
Allowance for credit losses After 5 to 10 years | $ 3,411,000 |  | $ 3,258,000 |  |  |
Held to Maturity Weighted-average yield After 5 to 10 years | 4.64% |  | 4.25% |  |  |
Held to Maturity Amortized Cost After 10 years | $ 69,768,000 |  | $ 69,769,000 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 4,181,000 |  | 9,777,000 |  |  |
Held to Maturity Fair value After 10 years | 65,587,000 |  | 59,992,000 |  |  |
Allowance for credit losses After 10 years | $ 5,298,000 |  | $ 4,896,000 |  |  |
Held to Maturity Weighted-average yield After 10 years | 4.35% |  | 4.06% |  |  |
Held To Maturity Securities Amortized | $ 178,415,000 |  | $ 178,133,000 |  |  |
Held to Maturity Gross Unrecognized gains | 3,115,000 |  | 2,086,000 |  |  |
Held to Maturity Gross Unrecognized losses | 6,511,000 |  | 13,072,000 |  |  |
Held to Maturity Fair value | 175,019,000 |  | 167,147,000 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 8,885,000 | $ 12,324,000 | $ 8,571,000 | $ 10,685,000 | $ 8,869,000 | $ 8,845,000
Held to Maturity Weighted-average yield | 4.39% |  | 4.04% |  |  |
FHLMC [Member] | Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 5 to 10 years | $ 24,398,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss | 8,000 |  |  |  |  |
Held to Maturity Gross Unrecognized losses After 5 to 10 years | 0 |  |  |  |  |
Held to Maturity Fair value After 5 to 10 years | 24,406,000 |  |  |  |  |
Allowance for credit losses After 5 to 10 years | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield After 5 to 10 years | 3.04% |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 20,211,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  |  |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 84,000 |  |  |  |  |
Held to Maturity Fair value After 10 years | 20,127,000 |  |  |  |  |
Allowance for credit losses After 10 years | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield After 10 years | 4.39% |  |  |  |  |
Held To Maturity Securities Amortized | $ 44,609,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains | 8,000 |  |  |  |  |
Held to Maturity Gross Unrecognized losses | 84,000 |  |  |  |  |
Held to Maturity Fair value | 44,533,000 |  |  |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield | 3.65% |  |  |  |  |
GNMA [Member] | Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 20,657,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  |  |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 121,000 |  |  |  |  |
Held to Maturity Fair value After 10 years | 20,536,000 |  |  |  |  |
Allowance for credit losses After 10 years | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield After 10 years | 3.38% |  |  |  |  |
FNMA [Member] | Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 75,530,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 326,000 |  |  |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 242,000 |  |  |  |  |
Held to Maturity Fair value After 10 years | 75,614,000 |  |  |  |  |
Allowance for credit losses After 10 years | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield After 10 years | 2.90% |  |  |  |  |
Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 139,016,000 |  |  |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  |  |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 1,476,000 |  |  |  |  |
Held to Maturity Fair value After 10 years | 137,540,000 |  |  |  |  |
Allowance for credit losses After 10 years | $ 0 |  |  |  |  |
Held to Maturity Weighted-average yield After 10 years | 3.25% |  |  |  |  |

X
- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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