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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCLI (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (55,487)   $ (49,862)      
Net unrealized gain (loss) on AFS securities:            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, before tax: (68,455)   (62,351)      
Income taxes related to items of accumulated other comprehensive loss: 16,142   14,702      
Accumulated other comprehensive loss (52,313) $ (49,633) (47,649) $ (55,307) $ (50,646) $ (55,246)
Net unrealized gain (loss) on hedging derivatives            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, before tax: (2,571)   (1,322)      
Income taxes related to items of accumulated other comprehensive loss: 606   312      
Accumulated other comprehensive loss (1,965) (1,726) (1,010) (957) (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: (1,517)   (1,540)      
Income taxes related to items of accumulated other comprehensive loss: 308   337      
Accumulated other comprehensive loss $ (1,209) $ (1,209) $ (1,203) $ (1,300) $ (1,300) $ (1,300)