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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (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
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value |  |  |  |  |  |  | $ (5,425) | $ (3,644)
Other comprehensive income (loss) | $ 24,693 |  |  | $ (19,434) |  |  | 24,564 | (7,593)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 6,516 |  |  | (5,162) |  |  | 6,482 | (2,030)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net change in fair value of investment securities | 19,942 |  |  | (18,061) |  |  | 15,036 | (12,880)
Total other comprehensive income (loss), net of tax | 18,177 | $ 1,632 | $ (1,727) | (14,272) | $ (2,547) | $ 11,256 | 18,082 | (5,563)
Net unrealized gains on investment securities |  |  |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) on AFS investment securities arising during the period | 27,092 |  |  | (24,729) |  |  |  |
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value | 1,920 |  |  | 2,026 |  |  | 5,425 | 5,670
Net change in fair value of investment securities | 29,012 |  |  | (22,568) |  |  |  |
Net unrealized gains arising during the period |  |  |  |  |  |  | 20,427 | (17,675)
Other comprehensive income (loss) |  |  |  |  |  |  | 25,852 | (11,870)
Defined benefit plans, Before Tax |  |  |  |  |  |  |  |
Amortization |  |  |  | (135) |  |  |  | (135)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) on AFS investment securities arising during the period | 7,150 |  |  | (6,569) |  |  |  |
Amortization of unrealized losses on investment securities transferred to HTM | 507 |  |  | 538 |  |  | 1,432 | 1,506
Net change in fair value of investment securities | 7,657 |  |  | (5,995) |  |  |  |
Net unrealized gains (losses) arising during the period |  |  |  |  |  |  | 5,391 | (4,696)
Other comprehensive income (loss) |  |  |  |  |  |  | 6,823 | (3,154)
Defined benefit plans, Tax Effect |  |  |  |  |  |  |  |
Amortization |  |  |  | (36) |  |  |  | (36)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) on investment securities arising during the period | 19,942 |  |  | (18,160) |  |  |  |
Amortization of unrealized losses on investment securities transferred to held-to-maturity | (1,413) |  |  | (1,488) |  |  | (3,993) | (4,164)
Net change in fair value of investment securities | 21,355 |  |  | (16,573) |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  | 15,036 | (12,979)
Total other comprehensive income (loss), net of tax |  |  |  |  |  |  | 19,029 | (8,716)
Defined benefit plans, Net of Tax |  |  |  |  |  |  |  |
Amortization |  |  |  | (99) |  |  |  | (99)
Gain (Loss) On Unrealized Losses On Derivative Instruments |  |  |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains arising during the period | (4,317) |  |  | 3,151 |  |  | (1,286) | 4,329
Other comprehensive income (loss) | (4,317) |  |  | 3,151 |  |  | (1,286) | 4,329
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) arising during the period | (1,140) |  |  | 838 |  |  | (340) | 1,139
Other comprehensive income (loss) | (1,140) |  |  | 838 |  |  | (340) | 1,139
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (3,177) |  |  | 2,313 |  |  | (946) | 3,190
Total other comprehensive income (loss), net of tax | (3,177) |  |  | 2,313 |  |  | (946) | 3,190
Amortization of net actuarial gain |  |  |  |  |  |  |  |
Defined benefit plans, Before Tax |  |  |  |  |  |  |  |
Amortization | 2 |  |  | 19 |  |  | 2 | 58
Defined benefit plans, Tax Effect |  |  |  |  |  |  |  |
Amortization | 1 |  |  | 7 |  |  | 1 | 17
Defined benefit plans, Net of Tax |  |  |  |  |  |  |  |
Amortization | 1 |  |  | 12 |  |  | 1 | 41
Amortization of net transition obligation |  |  |  |  |  |  |  |
Defined benefit plans, Before Tax |  |  |  |  |  |  |  |
Amortization |  |  |  | (2) |  |  |  | (6)
Defined benefit plans, Tax Effect |  |  |  |  |  |  |  |
Amortization |  |  |  | (2) |  |  |  | (2)
Defined benefit plans, Net of Tax |  |  |  |  |  |  |  |
Amortization |  |  |  | 0 |  |  |  | (4)
SERP |  |  |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 2 |  |  | 17 |  |  | 2 | 52
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 1 |  |  | 5 |  |  | 1 | 15
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0 |  |  | 0 |  |  | 0 | 0
Total other comprehensive income (loss), net of tax | (1) |  |  | (12) |  |  | (1) | (37)
Defined benefit plans, Net of Tax |  |  |  |  |  |  |  |
Amortization | $ 1 |  |  | $ 12 |  |  | $ 1 | $ 37

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