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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCLI (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (52,568) $ (49,862)    
Net unrealized gain (loss) on AFS securities:        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (64,948) (62,351)    
Income taxes related to items of accumulated other comprehensive loss: 15,315 14,702    
Accumulated other comprehensive loss (49,633) (47,649) $ (50,646) $ (55,246)
Net unrealized gain (loss) on hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (2,259) (1,322)    
Income taxes related to items of accumulated other comprehensive loss: 533 312    
Accumulated other comprehensive loss (1,726) (1,010) (1,205) (1,794)
Net unrealized gain (loss) on post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss, before tax: (1,518) (1,540)    
Income taxes related to items of accumulated other comprehensive loss: 309 337    
Accumulated other comprehensive loss $ (1,209) $ (1,203) $ (1,300) $ (1,300)