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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

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