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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization of unrealized losses on investment securities transferred to HTM |  |  |  |  | $ 3,505 | $ 3,644
Total reclassification adjustments from AOCI for the period, net of tax | $ 15,817 | $ 12,945 | $ 14,475 | $ 16,187 | 28,762 | 30,662
Amortization of net actuarial gain |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization |  |  | 20 |  |  | 39
Reclassification from AOCI, tax |  |  | (5) |  |  | (10)
Amounts reclassified from AOCI |  |  | 15 |  |  | 29
Amortization of net transition obligation |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization |  |  | (2) |  |  | (4)
Reclassification from AOCI, tax |  |  | 0 |  |  | 0
Amounts reclassified from AOCI |  |  | (2) |  |  | (4)
SERP |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amounts reclassified from AOCI | 0 |  | 13 |  | 0 | 25
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 | 1,374 |  | 1,438 |  | 2,580 | 2,651
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 | 1,867 |  | 1,976 |  | 3,505 | 3,644
Tax effect | (493) |  | (525) |  | (925) | (968)
Amortization of unrealized losses on investment securities transferred to held-to-maturity | 1,374 |  | 1,451 |  | 2,580 | 2,676
Amount Reclassified from AOCI | Amortization of net actuarial gain |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization | 0 |  | (20) |  | 0 | (39)
Amount Reclassified from AOCI | Amortization of net transition obligation |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization | 0 |  | 2 |  | 0 | 4
Amount Reclassified from AOCI | SERP |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |
Amortization | 0 |  | (18) |  | 0 | (35)
Reclassification from AOCI, tax | 0 |  | 5 |  | 0 | 10
Amounts reclassified from AOCI | $ 0 |  | $ (13) |  | $ 0 | $ (25)

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