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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Net change in fair value of investment securities:
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value							$ (5,143)	$ (5,425)
Other comprehensive income (loss)	$ 13,039			$ 24,693			30,376	24,564
Net change in fair value of investment securities:
Other comprehensive income (loss)	3,437			6,516			8,010	6,482
Net change in fair value of investment securities:
Reclassification adjustment for loss on sale of investment securities	22			0			22	0
Total other comprehensive income (loss), net of tax	9,602	$ 1,907	$ 10,857	18,177	$ 1,632	$ (1,727)	22,366	18,082
Net unrealized gains on investment securities
Net change in fair value of investment securities:
Net unrealized gains (losses) on AFS investment securities arising during the period	11,774			27,092			29,408	20,427
Less: Reclassification adjustments from AOCI realized in net income	30						30
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value	1,818			1,920			5,143	5,425
Net change in fair value of investment securities	13,622			29,012			34,581	25,852
Net change in fair value of investment securities:
Net unrealized gains (losses) on AFS investment securities arising during the period	3,104			7,150			7,755	5,391
Less: Reclassification adjustments from AOCI realized in net income	8						8
Less: Amortization of unrealized losses on investment securities transferred to HTM	479			507			1,356	1,432
Net change in fair value of investment securities	3,591			7,657			9,119	6,823
Net change in fair value of investment securities:
Net unrealized gains (losses) on investment securities arising during the period	8,670			19,942			21,653	15,036
Reclassification adjustment for loss on sale of investment securities	22						22
Amortization of unrealized losses on investment securities transferred to held-to-maturity	(1,339)			(1,413)			(3,787)	(3,993)
Net change in fair value of investment securities	10,031			21,355			25,462	19,029
Gain (Loss) On Unrealized Losses On Derivative Instruments
Net change in fair value of investment securities:
Net unrealized losses arising during the period	(583)			(4,317)			(4,205)	(1,286)
Net change in fair value of investment securities:
Net unrealized gains (losses) arising during the period	(154)			(1,140)			(1,109)	(340)
Net change in fair value of investment securities:
Other comprehensive income (loss) before reclassifications	(429)			(3,177)			(3,096)	(946)
SERP
Net change in fair value of investment securities:
Amortization of net actuarial gain				(2)				(2)
Net change in fair value of investment securities:
Reclassification from AOCI, tax				(1)				(1)
Net change in fair value of investment securities:
Other comprehensive income (loss) before reclassifications	0			0			0	0
Amortization of net actuarial gain	0			(1)			0	(1)
Total other comprehensive income (loss), net of tax	$ 0			$ (1)			$ 0	$ (1)

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