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DEBT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 323,142		$ 354,178
Held to Maturity Gross Unrecognized gains	3,346		4,811
Held to Maturity Gross Unrecognized losses	9,634		12,857
Held to Maturity Fair value	316,854		346,132
Allowance for credit losses, Held-to-Maturity securities	$ 1,119		$ 2,197
Held to Maturity Weighted-average yield	4.76%		4.84%
Interest receivable	$ 67,112		$ 77,716
Held-to-maturity Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Interest receivable	2,500		4,800
Municipal Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Due Withing One Year	2,131		3,165
Held to Maturity Gross Unrecognized gain Due Within One Year	196		8
Held to Maturity Gross Unrecognized losses Due Within One Year	10		38
Held to Maturity Fair value Due Within One Year	2,317		3,135
Allowance for credit losses Due within one year	$ 9		$ 50
Held to Maturity Weighted-average yield Due withing One Year	5.62%		9.30%
Held to Maturity Amortized Cost After 1 to 5 years	$ 61,119		$ 51,230
Held to Maturity Gross Unrecognized gains After 1 to 5 years	2,471		994
Held to Maturity Gross Unrecognized losses After 1 to 5 years	457		710
Held to Maturity Fair value After 1 to 5 years	63,133		51,514
Allowance for credit losses After 1 to 5 years	$ 662		$ 1,266
Held to Maturity Weighted-average yield After 1 to 5 years	7.81%		7.78%
Held to Maturity Amortized Cost After 5 to 10 years	$ 13,121		$ 36,050
Held to Maturity Gross Unrecognized gains After 5 to 10 years	679		3,540
Held to Maturity Gross Unrecognized losses After 5 to 10 years	229		210
Held to Maturity Fair value After 5 to 10 years	13,571		39,380
Allowance for credit losses After 5 to 10 years	$ 189		$ 604
Held to Maturity Weighted-average yield After 5 to 10 years	6.42%		7.13%
Held to Maturity Amortized Cost After 10 years	$ 15,755		$ 16,595
Held to Maturity Gross Unrecognized gains After 10 years	0		269
Held to Maturity Gross Unrecognized losses After 10 years	170		0
Held to Maturity Fair value After 10 years	15,585		16,864
Allowance for credit losses After 10 years	$ 259		$ 277
Held to Maturity Weighted-average yield After 10 years	8.80%		8.87%
Held To Maturity Securities Amortized	$ 92,126		$ 107,040
Held to Maturity Gross Unrecognized gains	3,346		4,811
Held to Maturity Gross Unrecognized losses	866		958
Held to Maturity Fair value	94,606		110,893
Allowance for credit losses, Held-to-Maturity securities	$ 1,119	$ 1,267	$ 2,197	$ 2,250	$ 8,401	$ 8,286
Held to Maturity Weighted-average yield	7.73%		7.78%
Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 133,852		$ 146,468
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	3,589		5,819
Held to Maturity Fair value	130,263		140,649
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.86%		3.84%
Commercial MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	$ 9,306		$ 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	124		297
Held to Maturity Fair value After 1 to 5 years	9,182		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	$ 87,858		$ 91,226
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	5,055		5,783
Held to Maturity Fair value After 10 years	82,803		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	$ 97,164		$ 100,670
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	5,179		6,080
Held to Maturity Fair value	91,985		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	$ 231,016		$ 247,138
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	8,768		11,899
Held to Maturity Fair value	222,248		235,239
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.57%		3.57%
Uninsured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held To Maturity Securities Amortized	$ 199,100		$ 126,600
Held to Maturity Fair value	194,300		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	13,084		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	250		556
Held to Maturity Fair value After 5 to 10 years	12,834		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	$ 17,281		$ 18,324
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	448		714
Held to Maturity Fair value After 10 years	16,833		17,610
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	4.31%		4.32%
Held To Maturity Securities Amortized	$ 30,365		$ 34,793
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	698		1,270
Held to Maturity Fair value	29,667		33,523
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.76%		3.71%
GNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 14,313		$ 16,265
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	432		789
Held to Maturity Fair value After 10 years	13,881		15,476
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.31%		3.32%
FNMA [Member] | Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 62,754		$ 67,271
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	1,545		2,486
Held to Maturity Fair value After 10 years	61,209		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	$ 26,420		$ 28,139
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	914		1,274
Held to Maturity Fair value After 10 years	25,506		26,865
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.49%		3.49%

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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.

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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).

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