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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income $ (21,355) $ 2,303    
Net unrealized gain (loss) on AFS securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, before tax: (26,264) 2,580    
Income taxes related to items of accumulated other comprehensive income: 6,039 (595)    
Accumulated other comprehensive income (20,225) 1,985 $ 4,508 $ 10,021
Net unrealized gain (loss) on hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, before tax: (751) 1,130    
Income taxes related to items of accumulated other comprehensive income: 173 (260)    
Accumulated other comprehensive income (578) 870 (787) (2,623)
Net unrealized gain (loss) on post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income, before tax: (718) (718)    
Income taxes related to items of accumulated other comprehensive income: 166 166    
Accumulated other comprehensive income $ (552) $ (552) $ (1,418) $ (1,418)