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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