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DEBT SECURITIES - Held-to-Maturity Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity debt securities	$ 273,363		$ 317,786
Held to Maturity Gross Unrecognized gains	2,933		3,815
Held to Maturity Gross Unrecognized losses	7,043		13,561
Held to Maturity Fair value	269,253		308,040
Allowance for credit losses, Held-to-Maturity securities	$ 698		$ 802
Held to Maturity Weighted-average yield	4.36%		4.83%
Interest receivable	$ 66,109		$ 71,881
Held-to-Maturity Securities [Member]
Schedule Of Held To Maturity Securities [Line Items]
Interest receivable	2,000		4,100
Government Bonds [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Due Withing One Year	1,017		2,214
Held to Maturity Gross Unrecognized gain Due Within One Year	64		134
Held to Maturity Gross Unrecognized losses Due Within One Year	4		6
Held to Maturity Fair value Due Within One Year	1,077		2,342
Allowance for credit losses Due within one year	$ 2		$ 6
Held to Maturity Weighted-average yield Due within One Year	5.11%		5.07%
Held to Maturity Amortized Cost After 1 to 5 years	$ 56,379		$ 61,289
Held to Maturity Gross Unrecognized gains After 1 to 5 years	2,139		2,724
Held to Maturity Gross Unrecognized losses After 1 to 5 years	163		438
Held to Maturity Fair value After 1 to 5 years	58,355		63,575
Allowance for credit losses After 1 to 5 years	$ 416		$ 433
Held to Maturity Weighted-average yield After 1 to 5 years	7.28%		7.33%
Held to Maturity Amortized Cost After 5 to 10 years	$ 10,313		$ 13,184
Held to Maturity Gross Unrecognized gains After 5 to 10 years	676		811
Held to Maturity Gross Unrecognized losses After 5 to 10 years	162		205
Held to Maturity Fair value After 5 to 10 years	10,827		13,790
Allowance for credit losses After 5 to 10 years	$ 89		$ 127
Held to Maturity Weighted-average yield After 5 to 10 years	5.06%		5.79%
Held to Maturity Amortized Cost After 10 years	$ 14,870		$ 15,755
Held to Maturity Gross Unrecognized gains After 10 years	54		146
Held to Maturity Gross Unrecognized losses After 10 years	0		0
Held to Maturity Fair value After 10 years	14,924		15,901
Allowance for credit losses After 10 years	$ 191		$ 236
Held to Maturity Weighted-average yield After 10 years	7.77%		8.07%
Held-to-maturity debt securities	$ 82,579		$ 92,442
Held to Maturity Gross Unrecognized gains	2,933		3,815
Held to Maturity Gross Unrecognized losses	329		649
Held to Maturity Fair value	85,183		95,608
Allowance for credit losses, Held-to-Maturity securities	$ 698	$ 765	$ 802	$ 1,119	$ 1,267	$ 2,197
Held to Maturity Weighted-average yield	7.06%		7.18%
Residential MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity debt securities	$ 116,576		$ 129,319
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	3,465		7,444
Held to Maturity Fair value	113,111		121,875
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.87%		3.86%
Residential MBS [Member] | FHLMC [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	$ 9,214
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0
Held to Maturity Gross Unrecognized losses After 1 to 5 years	142
Held to Maturity Fair value After 1 to 5 years	9,072
Allowance for credit losses After 1 to 5 years	$ 0
Held to Maturity Weighted-average yield After 1 to 5 years	3.03%
Held to Maturity Amortized Cost After 5 to 10 years			$ 12,112
Held to Maturity Gross Unrecognized gains After 5 to 10 years			0
Held to Maturity Gross Unrecognized losses After 5 to 10 years			353
Held to Maturity Fair value After 5 to 10 years			11,759
Allowance for credit losses After 5 to 10 years			$ 0
Held to Maturity Weighted-average yield After 5 to 10 years			3.03%
Held to Maturity Amortized Cost After 10 years	$ 15,826		$ 16,936
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	543		1,142
Held to Maturity Fair value After 10 years	15,283		15,794
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	4.31%		4.30%
Held-to-maturity debt securities	$ 25,040		$ 29,048
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	685		1,495
Held to Maturity Fair value	24,355		27,553
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.84%		3.77%
Residential MBS [Member] | GNMA [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 11,577		$ 13,472
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	438		842
Held to Maturity Fair value After 10 years	11,139		12,630
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.29%		3.29%
Residential MBS [Member] | FNMA [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 5 to 10 years	$ 9,583
Held to Maturity Gross Unrecognized gains After 5 to 10 years	0
Held to Maturity Gross Unrecognized losses After 5 to 10 years	392
Held to Maturity Fair value After 5 to 10 years	9,191
Allowance for credit losses After 5 to 10 years	$ 0
Held to Maturity Weighted-average yield After 5 to 10 years	3.11%
Held to Maturity Amortized Cost After 10 years	$ 46,977		$ 61,233
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	1,392		3,786
Held to Maturity Fair value After 10 years	45,585		57,447
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	4.41%		4.19%
Held-to-maturity debt securities	$ 56,560
Held to Maturity Gross Unrecognized gains	0
Held to Maturity Gross Unrecognized losses	1,784
Held to Maturity Fair value	54,776
Allowance for credit losses, Held-to-Maturity securities	$ 0
Held to Maturity Weighted-average yield	4.19%
Residential MBS [Member] | CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 10 years	$ 23,399		$ 25,566
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	558		1,321
Held to Maturity Fair value After 10 years	22,841		24,245
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	3.43%		3.49%
Commercial MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Due Withing One Year	$ 9,112
Held to Maturity Gross Unrecognized gain Due Within One Year	0
Held to Maturity Gross Unrecognized losses Due Within One Year	41
Held to Maturity Fair value Due Within One Year	9,071
Allowance for credit losses Due within one year	$ 0
Held to Maturity Weighted-average yield Due within One Year	3.48%
Held to Maturity Amortized Cost After 1 to 5 years			$ 9,258
Held to Maturity Gross Unrecognized gains After 1 to 5 years			0
Held to Maturity Gross Unrecognized losses After 1 to 5 years			151
Held to Maturity Fair value After 1 to 5 years			9,107
Allowance for credit losses After 1 to 5 years			$ 0
Held to Maturity Weighted-average yield After 1 to 5 years			3.48%
Held to Maturity Amortized Cost After 10 years	$ 65,096		$ 86,767
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	3,208		5,317
Held to Maturity Fair value After 10 years	61,888		81,450
Allowance for credit losses After 10 years	$ 0		$ 0
Held to Maturity Weighted-average yield After 10 years	1.94%		3.92%
Held-to-maturity debt securities	$ 74,208		$ 96,025
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	3,249		5,468
Held to Maturity Fair value	70,959		90,557
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	2.13%		3.88%
MBS [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity debt securities	$ 190,784		$ 225,344
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	6,714		12,912
Held to Maturity Fair value	184,070		212,432
Allowance for credit losses, Held-to-Maturity securities	$ 0		$ 0
Held to Maturity Weighted-average yield	3.20%		3.87%
Uninsured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]
Schedule Of Held To Maturity Securities [Line Items]
Held-to-maturity debt securities	$ 204,700		$ 198,600
Held to Maturity Fair value	$ 200,800		$ 192,400

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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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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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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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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in sixth through 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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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).

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Weighted average yield of investment in debt security measured at amortized cost (held-to-maturity) maturing in next 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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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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