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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCL (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (71,400)   $ (58,340)      
Net unrealized loss on AFS securities:            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, before tax: (86,469)   (71,832)      
Income taxes related to items of accumulated other comprehensive loss: 19,939   16,586      
Accumulated other comprehensive loss (66,530) $ (55,307) (55,246) $ (58,715) $ (38,304) $ 1,985
Net unrealized loss on hedging derivatives            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, before tax: (4,640)   (2,333)      
Income taxes related to items of accumulated other comprehensive loss: 1,070   539      
Accumulated other comprehensive loss (3,570) (957) (1,794) (3,322) (2,115) 870
Net unrealized loss on post-retirement plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss, before tax: (1,675)   (1,691)      
Income taxes related to items of accumulated other comprehensive loss: 375   391      
Accumulated other comprehensive loss $ (1,300) $ (1,300) $ (1,300) $ (552) $ (552) $ (552)