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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, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value |  |  |  |  |  |  | $ (5,143) | $ (5,425)
Other comprehensive income (loss) | $ 13,039 |  |  | $ 24,693 |  |  | 30,376 | 24,564
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 3,437 |  |  | 6,516 |  |  | 8,010 | 6,482
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Reclassification adjustment for loss on sale of investment securities | 22 |  |  | 0 |  |  | 22 | 0
Total other comprehensive income (loss), net of tax | 9,602 | $ 1,907 | $ 10,857 | 18,177 | $ 1,632 | $ (1,727) | 22,366 | 18,082
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 | 11,774 |  |  | 27,092 |  |  | 29,408 | 20,427
Less: Reclassification adjustments from AOCI realized in net income | 30 |  |  |  |  |  | 30 |
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value | 1,818 |  |  | 1,920 |  |  | 5,143 | 5,425
Net change in fair value of investment securities | 13,622 |  |  | 29,012 |  |  | 34,581 | 25,852
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) on AFS investment securities arising during the period | 3,104 |  |  | 7,150 |  |  | 7,755 | 5,391
Less: Reclassification adjustments from AOCI realized in net income | 8 |  |  |  |  |  | 8 |
Less: Amortization of unrealized losses on investment securities transferred to HTM | 479 |  |  | 507 |  |  | 1,356 | 1,432
Net change in fair value of investment securities | 3,591 |  |  | 7,657 |  |  | 9,119 | 6,823
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) on investment securities arising during the period | 8,670 |  |  | 19,942 |  |  | 21,653 | 15,036
Reclassification adjustment for loss on sale of investment securities | 22 |  |  |  |  |  | 22 |
Amortization of unrealized losses on investment securities transferred to held-to-maturity | (1,339) |  |  | (1,413) |  |  | (3,787) | (3,993)
Net change in fair value of investment securities | 10,031 |  |  | 21,355 |  |  | 25,462 | 19,029
Gain (Loss) On Unrealized Losses On Derivative Instruments |  |  |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized losses arising during the period | (583) |  |  | (4,317) |  |  | (4,205) | (1,286)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Net unrealized gains (losses) arising during the period | (154) |  |  | (1,140) |  |  | (1,109) | (340)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | (429) |  |  | (3,177) |  |  | (3,096) | (946)
SERP |  |  |  |  |  |  |  |
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Amortization of net actuarial gain |  |  |  | (2) |  |  |  | (2)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Reclassification from AOCI, tax |  |  |  | (1) |  |  |  | (1)
Net change in fair value of investment securities: |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 0 |  |  | 0 |  |  | 0 | 0
Amortization of net actuarial gain | 0 |  |  | (1) |  |  | 0 | (1)
Total other comprehensive income (loss), net of tax | $ 0 |  |  | $ (1) |  |  | $ 0 | $ (1)

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