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DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 359,169 |  | $ 437,537 |  |  |
Held to Maturity Gross Unrecognized gains | 4,819 |  | 4,068 |  |  |
Held to Maturity Gross Unrecognized losses | 21,137 |  | 14,490 |  |  |
Held to Maturity Fair value | 342,851 |  | 427,115 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 2,250 |  | $ 8,286 |  |  |
Held to Maturity Weighted-average yield | 4.80% |  | 4.71% |  |  |
Interest receivable | $ 68,783 |  | $ 69,730 |  |  |
Held-to-maturity Securities [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Interest receivable | 2,800 |  | 5,500 |  |  |
Municipal Bonds [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Due Withing One Year | 3,159 |  | 1,202 |  |  |
Held to Maturity Gross Unrecognized gain Due Within One Year | 15 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses Due Within One Year | 23 |  | 15 |  |  |
Held to Maturity Fair value Due Within One Year | 3,151 |  | 1,187 |  |  |
Allowance for credit losses Due within one year | $ 46 |  | $ 2 |  |  |
Held to Maturity Weighted-average yield Due withing One Year | 9.30% |  | 5.20% |  |  |
Held to Maturity Amortized Cost After 1 to 5 years | $ 51,133 |  | $ 42,530 |  |  |
Held to Maturity Gross Unrecognized gains After 1 to 5 years | 1,052 |  | 886 |  |  |
Held to Maturity Gross Unrecognized losses After 1 to 5 years | 1,111 |  | 1,076 |  |  |
Held to Maturity Fair value After 1 to 5 years | 51,074 |  | 42,340 |  |  |
Allowance for credit losses After 1 to 5 years | $ 1,320 |  | $ 656 |  |  |
Held to Maturity Weighted-average yield After 1 to 5 years | 7.71% |  | 6.34% |  |  |
Held to Maturity Amortized Cost After 5 to 10 years | $ 35,831 |  | $ 55,956 |  |  |
Held to Maturity Gross Unrecognized gains After 5 to 10 years | 3,540 |  | 3,182 |  |  |
Held to Maturity Gross Unrecognized losses After 5 to 10 years | 271 |  | 360 |  |  |
Held to Maturity Fair value After 5 to 10 years | 39,100 |  | 58,778 |  |  |
Allowance for credit losses After 5 to 10 years | $ 605 |  | $ 3,243 |  |  |
Held to Maturity Weighted-average yield After 5 to 10 years | 7.05% |  | 6.29% |  |  |
Held to Maturity Amortized Cost After 10 years | $ 16,595 |  | $ 66,022 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 212 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 0 |  | 1,318 |  |  |
Held to Maturity Fair value After 10 years | 16,807 |  | 64,704 |  |  |
Allowance for credit losses After 10 years | $ 279 |  | $ 4,385 |  |  |
Held to Maturity Weighted-average yield After 10 years | 8.75% |  | 7.10% |  |  |
Held To Maturity Securities Amortized | $ 106,718 |  | $ 165,710 |  |  |
Held to Maturity Gross Unrecognized gains | 4,819 |  | 4,068 |  |  |
Held to Maturity Gross Unrecognized losses | 1,405 |  | 2,769 |  |  |
Held to Maturity Fair value | 110,132 |  | 167,009 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 2,250 | $ 8,401 | $ 8,286 | $ 8,257 | $ 8,885 | $ 8,571
Held to Maturity Weighted-average yield | 7.70% |  | 6.62% |  |  |
Residential MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 150,650 |  | $ 166,739 |  |  |
Held to Maturity Gross Unrecognized gains | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses | 12,034 |  | 7,156 |  |  |
Held to Maturity Fair value | 138,616 |  | 159,583 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield | 3.84% |  | 3.78% |  |  |
Commercial MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 1 to 5 years | $ 9,489 |  | $ 9,621 |  |  |
Held to Maturity Gross Unrecognized gains After 1 to 5 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 1 to 5 years | 516 |  | 396 |  |  |
Held to Maturity Fair value After 1 to 5 years | 8,973 |  | 9,225 |  |  |
Allowance for credit losses After 1 to 5 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 1 to 5 years | 3.48% |  | 3.48% |  |  |
Held to Maturity Amortized Cost After 10 years | $ 92,312 |  | $ 95,467 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 7,182 |  | 4,169 |  |  |
Held to Maturity Fair value After 10 years | 85,130 |  | 91,298 |  |  |
Allowance for credit losses After 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 10 years | 3.15% |  | 3.15% |  |  |
Held To Maturity Securities Amortized | $ 101,801 |  | $ 105,088 |  |  |
Held to Maturity Gross Unrecognized gains | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses | 7,698 |  | 4,565 |  |  |
Held to Maturity Fair value | 94,103 |  | 100,523 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield | 3.18% |  | 3.18% |  |  |
MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 252,451 |  | $ 271,827 |  |  |
Held to Maturity Gross Unrecognized gains | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses | 19,732 |  | 11,721 |  |  |
Held to Maturity Fair value | 232,719 |  | 260,106 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield | 3.57% |  | 3.55% |  |  |
Unisured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held To Maturity Securities Amortized | $ 179,900 |  | $ 190,100 |  |  |
Held to Maturity Fair value | 174,900 |  | 189,400 |  |  |
FHLMC [Member] | Residential MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 5 to 10 years | 17,580 |  | 21,443 |  |  |
Held to Maturity Gross Unrecognized gains After 5 to 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 5 to 10 years | 1,131 |  | 746 |  |  |
Held to Maturity Fair value After 5 to 10 years | 16,449 |  | 20,697 |  |  |
Allowance for credit losses After 5 to 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 5 to 10 years | 3.03% |  | 3.03% |  |  |
Held to Maturity Amortized Cost After 10 years | $ 18,740 |  | $ 19,362 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 1,689 |  | 888 |  |  |
Held to Maturity Fair value After 10 years | 17,051 |  | 18,474 |  |  |
Allowance for credit losses After 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 10 years | 4.34% |  | 4.21% |  |  |
Held To Maturity Securities Amortized | $ 36,320 |  | $ 40,805 |  |  |
Held to Maturity Gross Unrecognized gains | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses | 2,820 |  | 1,634 |  |  |
Held to Maturity Fair value | 33,500 |  | 39,171 |  |  |
Allowance for credit losses, Held-to-Maturity securities | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield | 3.70% |  | 3.59% |  |  |
GNMA [Member] | Residential MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 16,786 |  | $ 19,131 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 1,414 |  | 943 |  |  |
Held to Maturity Fair value After 10 years | 15,372 |  | 18,188 |  |  |
Allowance for credit losses After 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 10 years | 3.35% |  | 3.35% |  |  |
FNMA [Member] | Residential MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 68,388 |  | $ 72,347 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 5,902 |  | 3,155 |  |  |
Held to Maturity Fair value After 10 years | 62,486 |  | 69,192 |  |  |
Allowance for credit losses After 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 10 years | 4.17% |  | 4.14% |  |  |
CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [Member] | Residential MBS [Member] |  |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |  |
Held to Maturity Amortized Cost After 10 years | $ 29,156 |  | $ 34,456 |  |  |
Held to Maturity Gross Unrecognized gains After 10 years | 0 |  | 0 |  |  |
Held to Maturity Gross Unrecognized losses After 10 years | 1,898 |  | 1,424 |  |  |
Held to Maturity Fair value After 10 years | 27,258 |  | 33,032 |  |  |
Allowance for credit losses After 10 years | $ 0 |  | $ 0 |  |  |
Held to Maturity Weighted-average yield After 10 years | 3.49% |  | 3.49% |  |  |

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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- 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 next fiscal year through fifth 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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- 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 after 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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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (4) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Industry Guide -Number 3 -Section II -Paragraph B -Publisher SEC + Details
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- Definition Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Subparagraph (2) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Industry Guide -Number 3 -Section II -Paragraph B -Publisher SEC + Details
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