DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 349,330	$ 354,178
Held to Maturity Gross Unrecognized gains	3,875	4,811
Held to Maturity Gross Unrecognized losses	15,085	12,857
Held to Maturity Fair value	338,120	346,132
Allowance for credit losses, Held-to-Maturity securities	$ 1,235	$ 2,197
Held to Maturity Weighted-average yield	4.85%	4.84%
Interest receivable	$ 73,154	$ 77,716
Held-to-maturity Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Interest receivable	2,800	4,800
Municipal Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Due Withing One Year	3,172	3,165
Held to Maturity Gross Unrecognized gain Due Within One Year	4	8
Held to Maturity Gross Unrecognized losses Due Within One Year	16	38
Held to Maturity Fair value Due Within One Year	3,160	3,135
Allowance for credit losses Due within one year	$ 36	$ 50
Held to Maturity Weighted-average yield Due withing One Year	9.30%	9.30%
Held to Maturity Amortized Cost After 1 to 5 years	$ 51,327	$ 51,230
Held to Maturity Gross Unrecognized gains After 1 to 5 years	713	994
Held to Maturity Gross Unrecognized losses After 1 to 5 years	831	710
Held to Maturity Fair value After 1 to 5 years	51,209	51,514
Allowance for credit losses After 1 to 5 years	$ 460	$ 1,266
Held to Maturity Weighted-average yield After 1 to 5 years	7.74%	7.78%
Held to Maturity Amortized Cost After 5 to 10 years	$ 36,034	$ 36,050
Held to Maturity Gross Unrecognized gains After 5 to 10 years	3,135	3,540
Held to Maturity Gross Unrecognized losses After 5 to 10 years	257	210
Held to Maturity Fair value After 5 to 10 years	38,912	39,380
Allowance for credit losses After 5 to 10 years	$ 450	$ 604
Held to Maturity Weighted-average yield After 5 to 10 years	7.06%	7.13%
Held to Maturity Amortized Cost After 10 years	$ 16,595	$ 16,595
Held to Maturity Gross Unrecognized gains After 10 years	23	269
Held to Maturity Gross Unrecognized losses After 10 years	16	0
Held to Maturity Fair value After 10 years	16,602	16,864
Allowance for credit losses After 10 years	$ 289	$ 277
Held to Maturity Weighted-average yield After 10 years	8.81%	8.87%
Held To Maturity Securities Amortized	$ 107,128	$ 107,040
Held to Maturity Gross Unrecognized gains	3,875	4,811
Held to Maturity Gross Unrecognized losses	1,120	958
Held to Maturity Fair value	109,883	110,893
Allowance for credit losses, Held-to-Maturity securities	$ 1,235	$ 2,197	$ 7,646	$ 8,286
Held to Maturity Weighted-average yield	7.72%	7.78%
Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 142,677	$ 146,468
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	7,649	5,819
Held to Maturity Fair value	135,028	140,649
Allowance for credit losses, Held-to-Maturity securities	$ 0	$ 0
Held to Maturity Weighted-average yield	3.85%	3.84%
Commercial MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	$ 9,397	$ 9,444
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0	0
Held to Maturity Gross Unrecognized losses After 1 to 5 years	334	297
Held to Maturity Fair value After 1 to 5 years	9,063	9,147
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	$ 90,128	$ 91,226
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	5,982	5,783
Held to Maturity Fair value After 10 years	84,146	85,443
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	$ 99,525	$ 100,670
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	6,316	6,080
Held to Maturity Fair value	93,209	94,590
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	$ 242,202	$ 247,138
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	13,965	11,899
Held to Maturity Fair value	228,237	235,239
Allowance for credit losses, Held-to-Maturity securities	$ 0	$ 0
Held to Maturity Weighted-average yield	3.57%	3.57%
Unisured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 126,200	$ 126,600
Held to Maturity Fair value	125,500	125,900
FHLMC [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 5 to 10 years	15,337	16,469
Held to Maturity Gross Unrecognized gains After 5 to 10 years	0	0
Held to Maturity Gross Unrecognized losses After 5 to 10 years	626	556
Held to Maturity Fair value After 5 to 10 years	14,711	15,913
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	$ 18,165	$ 18,324
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	1,025	714
Held to Maturity Fair value After 10 years	17,140	17,610
Allowance for credit losses After 10 years	$ 0	$ 0
Held to Maturity Weighted-average yield After 10 years	4.33%	4.32%
Held To Maturity Securities Amortized	$ 33,502	$ 34,793
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	1,651	1,270
Held to Maturity Fair value	31,851	33,523
Allowance for credit losses, Held-to-Maturity securities	$ 0	$ 0
Held to Maturity Weighted-average yield	3.74%	3.71%
GNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 15,649	$ 16,265
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	910	789
Held to Maturity Fair value After 10 years	14,739	15,476
Allowance for credit losses After 10 years	$ 0	$ 0
Held to Maturity Weighted-average yield After 10 years	3.30%	3.32%
FNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 66,109	$ 67,271
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	3,504	2,486
Held to Maturity Fair value After 10 years	62,605	64,785
Allowance for credit losses After 10 years	$ 0	$ 0
Held to Maturity Weighted-average yield After 10 years	4.18%	4.18%
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	$ 27,417	$ 28,139
Held to Maturity Gross Unrecognized gains After 10 years	0	0
Held to Maturity Gross Unrecognized losses After 10 years	1,584	1,274
Held to Maturity Fair value After 10 years	25,833	26,865
Allowance for credit losses After 10 years	$ 0	$ 0
Held to Maturity Weighted-average yield After 10 years	3.49%	3.49%