ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Net change in fair value of investment securities:
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value	$ (1,530)	$ (1,552)
Net actuarial losses arising during the period	0	0
Other comprehensive income (loss)	(703)	14,746
Net change in fair value of investment securities:
Net actuarial losses arising during the period	0	0
Other comprehensive income (loss)	(222)	3,889
Net change in fair value of investment securities:
Net actuarial losses arising during the period	0	0
Total other comprehensive (loss) income, net of tax	(481)	10,857
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	(2,634)	15,287
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value	1,530	1,552
Net change in fair value of investment securities	(1,104)	16,839
Net change in fair value of investment securities:
Net unrealized gains (losses) on AFS investment securities arising during the period	(716)	4,032
Less: Amortization of unrealized losses on investment securities transferred to HTM	387	409
Net change in fair value of investment securities	(329)	4,441
Net change in fair value of investment securities:
Net unrealized gains (losses) on investment securities arising during the period	(1,918)	11,255
Amortization of unrealized losses on investment securities transferred to held-to-maturity	(1,143)	(1,143)
Net change in fair value of investment securities	(775)	12,398
Gain (Loss) On Unrealized Losses On Derivative Instruments
Net change in fair value of investment securities:
Net unrealized losses arising during the period	400	(2,093)
Other comprehensive income (loss)	400	(2,093)
Net change in fair value of investment securities:
Net unrealized gains (losses) arising during the period	107	(552)
Other comprehensive income (loss)	107	(552)
Net change in fair value of investment securities:
Other comprehensive income (loss) before reclassifications	293	(1,541)
Total other comprehensive (loss) income, net of tax	293	(1,541)
Amortization of net actuarial gain
Net change in fair value of investment securities:
Amortization of net actuarial gain*	1	0
Net change in fair value of investment securities:
Reclassification from AOCI, tax	0	0
Net change in fair value of investment securities:
Amortization of net actuarial gain*	1	0
SERP
Net change in fair value of investment securities:
Other comprehensive income (loss)	1	0
Net change in fair value of investment securities:
Other comprehensive income (loss)	0	0
Net change in fair value of investment securities:
Other comprehensive income (loss) before reclassifications	0	0
Amortization of net actuarial gain*	1	0
Total other comprehensive (loss) income, net of tax	$ 1	$ 0