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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net change in fair value of investment securities: |  |  |
Less: Reclassification adjustment for losses (gains) realized in net income | $ 2,074 |  |
Less: Amortization of unrealized losses on investment securities transferred to HTM | (7,440) | $ (4,295) | $ 0
Other comprehensive income (loss) | 29,518 | (184,493) | (38,319)
Defined benefit plans, Before Tax |  |  |
Net actuarial gains (losses) arising during the period | (182) | 2,007 | 2,014
Settlement |  | 4,884 |
Net change in fair value of investment securities: |  |  |
Less: Reclassification adjustment for losses (gains) realized in net income | 547 |  |
Other comprehensive income (loss) | 8,130 | (48,469) | (10,231)
Defined benefit plans, Tax Effect |  |  |
Net actuarial gains (losses) arising during the period | (48) | 537 | 544
Settlement |  | 1,817 |
Net change in fair value of investment securities: |  |  |
Less: Reclassification adjustment for losses (gains) realized in net income | (1,527) |  |
Net change in fair value of investment securities | 15,852 | (150,141) | (30,317)
Total other comprehensive income (loss), net of tax | 21,388 | (136,024) | (28,088)
Defined benefit plans, Net of Tax |  |  |
Net actuarial losses arising during the period | (134) | 1,470 | 1,470
Settlement |  | 3,067 |
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest |  |  |
Net change in fair value of investment securities: |  |  |
Net unrealized gains (losses) on investment securities arising during the period | 19,762 | (204,250) | (41,237)
Less: Reclassification adjustment for losses (gains) realized in net income |  |  | (150)
Less: Amortization of unrealized losses on investment securities transferred to HTM | 7,440 | 6,218 |
Net change in fair value of investment securities | 29,276 | (198,032) | (41,387)
Net change in fair value of investment securities: |  |  |
Net unrealized gains (losses) on investment securities arising during the period | 5,437 | (54,109) | (11,030)
Less: Reclassification adjustment for losses (gains) realized in net income |  |  | (40)
Less: Amortization of unrealized losses on investment securities transferred to HTM | 2,105 | 1,520 |
Net change in fair value of investment securities | 8,089 | (52,589) | (11,070)
Net change in fair value of investment securities: |  |  |
Net unrealized gains (losses) on investment securities arising during the period | 14,325 | (150,141) | (30,207)
Less: Reclassification adjustment for losses (gains) realized in net income |  |  | 110
Less: Amortization of unrealized losses on investment securities transferred to HTM | (5,335) | (4,698) |
Net change in fair value of investment securities | 21,187 | (145,443) | (30,317)
Gain (Loss) On Unrealized Losses On Derivative Instruments |  |  |
Net change in fair value of investment securities: |  |  |
Net unrealized gains arising during the period | 491 | 6,326 |
Other comprehensive income (loss) | 491 | 6,326 |
Net change in fair value of investment securities: |  |  |
Net unrealized gains arising during the period | 107 | 1,681 |
Other comprehensive income (loss) | 107 | 1,681 |
Net change in fair value of investment securities: |  |  |
Other comprehensive income (loss) before reclassifications | 384 | 4,645 |
Total other comprehensive income (loss), net of tax | 384 | 4,645 |
Amortization of net actuarial gains (losses) |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization | (74) | (304) | (1,036)
Defined benefit plans, Tax Effect |  |  |
Amortization | (20) | (81) | (291)
Defined benefit plans, Net of Tax |  |  |
Amortization | (54) | (223) | (745)
Amortization of net transition obligation |  |  |
Defined benefit plans, Before Tax |  |  |
Amortization | 7 | 18 | (18)
Defined benefit plans, Tax Effect |  |  |
Amortization | 2 | 4 | (4)
Defined benefit plans, Net of Tax |  |  |
Amortization | 5 | 14 | (14)
Defined Benefit Plans |  |  |
Net change in fair value of investment securities: |  |  |
Other comprehensive income (loss) | (249) | 7,213 | 3,068
Net change in fair value of investment securities: |  |  |
Other comprehensive income (loss) | (66) | 2,439 | 839
Net change in fair value of investment securities: |  |  |
Other comprehensive income (loss) before reclassifications | (134) | 1,470 | 1,470
Total other comprehensive income (loss), net of tax | (183) | 4,774 | 2,229
Defined benefit plans, Net of Tax |  |  |
Amortization | $ 49 | $ (3,304) | $ (759)

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