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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCL (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (49,862) $ (58,340)    
Net unrealized gain (loss) on AFS securities:        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (62,351) (71,832)    
Income taxes related to items of accumulated other comprehensive loss: 14,702 16,586    
Accumulated other comprehensive loss (47,649) (55,246) $ 1,985 $ 10,023
Net unrealized gain (loss) on hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (1,322) (2,333)    
Income taxes related to items of accumulated other comprehensive loss: 312 539    
Accumulated other comprehensive loss (1,010) (1,794) 870 (1,865)
Net unrealized gain (loss) on post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (1,540) (1,691)    
Income taxes related to items of accumulated other comprehensive loss: 337 391    
Accumulated other comprehensive loss $ (1,203) $ (1,300) $ (552) $ (1,418)