ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of unrealized losses on investment securities transferred to HTM	$ 1,638	$ 1,668
Total reclassification adjustments from AOCI for the period, net of tax	12,945	16,187
Amortization of net actuarial gain
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization		19
Reclassification from AOCI, tax		(5)
Amounts reclassified from AOCI		14
Amortization of net transition obligation
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization		(2)
Reclassification from AOCI, tax		0
Amounts reclassified from AOCI		(2)
SERP
Amounts reclassified out of each component of accumulated other comprehensive income
Amounts reclassified from AOCI	0	12
Amount Reclassified from AOCI
Amounts reclassified out of each component of accumulated other comprehensive income
Total reclassification adjustments from AOCI for the period, net of tax	(1,206)	(1,213)
Amount Reclassified from AOCI \| Amortization of unrealized losses on investment securities transferred to HTM
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization of unrealized losses on investment securities transferred to HTM	(1,638)	(1,668)
Tax effect	432	443
Amortization of unrealized losses on investment securities transferred to held-to-maturity	(1,206)	(1,225)
Amount Reclassified from AOCI \| Amortization of net actuarial gain
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	19
Amount Reclassified from AOCI \| Amortization of net transition obligation
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	(2)
Amount Reclassified from AOCI \| SERP
Amounts reclassified out of each component of accumulated other comprehensive income
Amortization	0	17
Reclassification from AOCI, tax	0	(5)
Amounts reclassified from AOCI	$ 0	$ 12

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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