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OTHER COMPREHENSIVE INCOME (LOSS) Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
AFS Debt Securities: |  |  |  |  |  |  |  |
Unrealized holding gains, pre-tax amount | $ 10,977 | $ 22,412 | $ 33,384 | $ 15,572 |  |  |  |
Unrealized holdings gains, tax (expense) benefit | (2,504) | (4,819) | (7,657) | (3,348) |  |  |  |
Unrealized holdings gains, after-tax amount | 8,473 | 17,593 |  |  |  |  |  |
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, pre-tax amount | (1,947) | (1,739) | (5,153) | (4,886) |  |  |  |
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, tax (expense) benefit | 444 | 373 | 1,213 | 1,050 |  |  |  |
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, after-tax amount | (1,503) | (1,366) |  |  |  |  |  |
Net unrealized gains, pre-tax amount | 12,924 | 24,151 | 38,537 | 20,458 |  |  |  |
Net unrealized gains, tax (expense) benefit | (2,948) | (5,192) | (8,870) | (4,398) |  |  |  |
Net unrealized gains, after-tax amount | 9,976 | 18,959 | 29,667 | 16,060 |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Net decrease in fair value, pre-tax amount | 233 | (4,956) | (2,001) | (666) |  |  |  |
Net decrease in fair value, tax (expense) benefit | (53) | 1,066 | 456 | 143 |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax | 180 | (3,890) |  |  |  |  |  |
Less: effective portion reclassified into interest expense, after-tax amount |  |  |  | (1,316) |  |  |  |
Net decrease in fair value, pre-tax amount | (665) | (6,141) | (4,437) | (2,025) |  |  |  |
Net decrease in fair value, tax (expense) benefit | 152 | 1,320 | 1,011 | 435 |  |  |  |
Net decrease in fair value, after-tax amount | (513) | (4,821) | (3,426) | (1,590) |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Net gain on postretirement plans, pre-tax amount | (8) | (8) | (22) | (22) |  |  |  |
Net gain on postretirement plans, tax (expense) benefit | 2 | 2 | 5 | 5 |  |  |  |
Net gain on postretirement plans, net of tax | (6) | (6) | (17) | (17) |  |  |  |
Other comprehensive income, pre-tax amount | 12,251 | 18,002 | 34,078 | 18,411 |  |  |  |
Other comprehensive income, tax (expense) benefit | (2,794) | (3,870) | (7,854) | (3,958) |  |  |  |
Other comprehensive income | 9,457 | 14,132 | 26,224 | 14,453 |  |  |  |
Less: Amounts reclassified from AOCI | (804) | (429) | (2,042) | (2,752) |  |  |  |
Other comprehensive income before reclassifications | 8,653 | 13,703 | 24,182 | 11,701 |  |  |  |
Stockholders' Equity Attributable to Parent | 676,444 | 529,900 | 676,444 | 529,900 | $ 652,148 | $ 531,231 | $ 508,286 | $ 495,064
Net Unrealized Gains (Losses) on Cash Flow Hedges(1) |  |  |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Other comprehensive income | (513) | (4,821) | (3,426) | (1,590) |  |  |  |
Less: Amounts reclassified from AOCI | 693 | 931 |  | 1,067 |  |  |  |
Other comprehensive income before reclassifications | 180 | (3,890) | (1,545) | (523) |  |  |  |
Stockholders' Equity Attributable to Parent | 5,532 | 4,506 | 5,532 | 4,506 | 6,045 | 8,958 | 9,327 | 6,096
Net Unrealized Gains (Losses) on Debt Securities(1) |  |  |  |  |  |  |  |
AFS Debt Securities: |  |  |  |  |  |  |  |
Unrealized holdings gains, after-tax amount |  |  | 25,727 | 12,224 |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Other comprehensive income | 9,976 | 18,959 | 29,667 | 16,060 |  |  |  |
Less: Amounts reclassified from AOCI | (1,503) | (1,366) | (3,940) | (3,836) |  |  |  |
Other comprehensive income before reclassifications | 8,473 | 17,593 |  | 12,224 |  |  |  |
Stockholders' Equity Attributable to Parent | (74,348) | (91,349) | (74,348) | (91,349) | (84,324) | (104,015) | (110,308) | (107,409)
Defined Benefit Postretirement Plans(1) |  |  |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Other comprehensive income | (6) | (6) | (17) | (17) |  |  |  |
Less: Amounts reclassified from AOCI | 6 | 6 | 17 | 17 |  |  |  |
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0 |  |  |  |
Stockholders' Equity Attributable to Parent | 394 | (256) | 394 | (256) | 400 | 411 | (250) | (239)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (68,422) | (87,099) | (68,422) | (87,099) | $ (77,879) | $ (94,646) | $ (101,231) | $ (101,552)
Interest Expense, Borrowings |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Less: effective portion reclassified into interest expense, pre-tax amount | 898 | 1,185 | 2,436 | 3,035 |  |  |  |
Less: effective portion reclassified into interest expense, tax (expense) benefit | (205) | (254) | (555) | (652) |  |  |  |
Less: effective portion reclassified into interest expense, after-tax amount | 693 | $ 931 |  |  |  |  |  |
Postretirement Plans: |  |  |  |  |  |  |  |
Less: Amounts reclassified from AOCI | $ (693) |  | (1,881) | (2,383) |  |  |  |
Interest Income, Interest and Fees on Loans |  |  |  |  |  |  |  |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Less: effective portion reclassified into interest expense, pre-tax amount |  |  | 0 | (1,676) |  |  |  |
Less: effective portion reclassified into interest expense, tax (expense) benefit |  |  | 0 | $ 360 |  |  |  |
Less: effective portion reclassified into interest expense, after-tax amount |  |  | $ 0 |  |  |  |  |

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