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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Net loss on sales of investment securities | $ 0 |  |  | $ (135) |  |  | $ 0 | $ (135)
Income tax (expenses) benefit | (3,760) |  |  | (4,349) |  |  | (12,569) | (13,880)
Amortization of unrealized losses on investment securities transferred to HTM |  |  |  |  |  |  | 5,425 | 3,644
Total reclassification adjustments from AOCI for the period, net of tax | 13,305 | $ 15,817 | $ 12,945 | 13,141 | $ 14,475 | $ 16,187 | 42,067 | 43,803
Investment Securities |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | (1,413) |  |  | (1,587) |  |  | (3,993) | (4,263)
Amortization of net actuarial gain |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization | 2 |  |  | 19 |  |  | 2 | 58
Reclassification from AOCI, tax | (1) |  |  | (7) |  |  | (1) | (17)
Amounts reclassified from AOCI | 1 |  |  | 12 |  |  | 1 | 41
Amortization of net transition obligation |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization |  |  |  | (2) |  |  |  | (6)
Reclassification from AOCI, tax |  |  |  | 2 |  |  |  | 2
Amounts reclassified from AOCI |  |  |  | 0 |  |  |  | (4)
SERP |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | 1 |  |  | 12 |  |  | 1 | 37
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 | 1,412 |  |  | 1,575 |  |  | 3,992 | 4,226
Amount Reclassified from AOCI | Investment Securities |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Net loss on sales of investment securities | 0 |  |  | 135 |  |  | 0 | 135
Income tax (expenses) benefit | 0 |  |  | (36) |  |  | 0 | (36)
Total reclassification adjustments from AOCI for the period, net of tax | 0 |  |  | 99 |  |  | 0 | 99
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 | 1,920 |  |  | 2,026 |  |  | 5,425 | 5,670
Tax effect | (507) |  |  | (538) |  |  | (1,432) | (1,506)
Amortization of unrealized losses on investment securities transferred to held-to-maturity | 1,413 |  |  | 1,488 |  |  | 3,993 | 4,164
Amount Reclassified from AOCI | Amortization of net actuarial gain |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization | (2) |  |  | (19) |  |  | (2) | (58)
Amount Reclassified from AOCI | Amortization of net transition obligation |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization | 0 |  |  | 2 |  |  | 0 | 6
Amount Reclassified from AOCI | SERP |  |  |  |  |  |  |  |
Amounts reclassified out of each component of accumulated other comprehensive income |  |  |  |  |  |  |  |
Amortization | (2) |  |  | (17) |  |  | (2) | (52)
Reclassification from AOCI, tax | 1 |  |  | 5 |  |  | 1 | 15
Amounts reclassified from AOCI | $ (1) |  |  | $ (12) |  |  | $ (1) | $ (37)

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