v3.25.4
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income, before tax $ 36,559 $ 38,161 $ 31,713
Income tax effect (10,010) (10,794) (9,010)
Total other comprehensive income, net of taxes 26,549 27,367 22,703
Accumulated Other Comprehensive Income (Loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income, before tax 36,559 38,161 31,713
Income tax effect (10,010) (10,794) (9,010)
Total other comprehensive income, net of taxes 26,549 27,367 22,703
Total unrealized gains (losses) on Benefit Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income, before tax 56 172 243
Income tax effect (16) (55) (72)
Total other comprehensive income, net of taxes 40 117 171
Unrealized gains (losses) on available for sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income, before tax 36,772 37,345 31,470
Income tax effect (10,067) (10,566) (8,938)
Total other comprehensive income, net of taxes 26,705 26,779 22,532
Unrealized holding gains (losses) on available for sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax 31,269 25,415 22,183
Reclassification adjustment for losses realized in income on sale of securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification adjustment 3,404 9,698 7,392
Accretion of net unrealized loss on securities transferred to held-to-maturity      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification adjustment 2,099 2,232 1,895
Other comprehensive income, before tax 2,099 2,232 1,895
Income tax effect (603) (665) (554)
Unrealized gain on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax (255) 514 0
Other comprehensive income, before tax (269) 644 0
Income tax effect 73 (173) 0
Total other comprehensive income, net of taxes (196) 471 0
Reclassification adjustment for losses (gains) realized in interest income on securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification adjustment (14) 130 0
Postretirement Benefit Plans | Change in obligation for postretirement benefits and for prior service credit      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax 109 150 174
Postretirement Benefit Plans | Reclassification adjustment for prior service expense      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassification adjustment 29 29 29
Other Postretirement Benefits Plan | Total unrealized gains (losses) on Benefit Plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other comprehensive income, before tax $ (82) $ (7) $ 40