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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCL (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive loss $ (57,564)   $ (58,340)      
Net unrealized gain (loss) on AFS securities:            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax: (71,883)   (71,832)      
Income taxes related to items of accumulated other comprehensive income: 16,576   16,586      
Accumulated other comprehensive loss (55,307) $ (50,646) (55,246) $ (38,304) $ (20,225) $ 1,985
Net gain (loss) on effective cash flow hedging derivatives            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax: (1,245)   (2,333)      
Income taxes related to items of accumulated other comprehensive income: 288   539      
Accumulated other comprehensive loss (957) (1,205) (1,794) (2,115) (578) 870
Net unrealized loss on post-retirement plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income, before tax: (1,675)   (1,691)      
Income taxes related to items of accumulated other comprehensive income: 375   391      
Accumulated other comprehensive loss $ (1,300) $ (1,300) $ (1,300) $ (552) $ (552) $ (552)