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OTHER COMPREHENSIVE INCOME (LOSS) - Reclassifications (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net securities gains (losses) $ (1) $ 3 $ 114
Income tax expense (11,821) (16,651) (12,626)
NET INCOME 60,672 71,109 52,987
Amount reclassified from accumulated other comprehensive income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
NET INCOME (565) (942) (1,469)
Unrealized gains and (Losses) on available- for-sale Securities | Amount reclassified from accumulated other comprehensive income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net securities gains (losses) (1) 3 114
Income tax expense   (1) (29)
NET INCOME (1) 2 85
Retirement plans | Amount reclassified from accumulated other comprehensive income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Change in funded status of post retirement benefits (752) (1,259) (2,072)
Income tax expense 188 315 518
NET INCOME $ (564) $ (944) $ (1,554)