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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) $ 11,016 $ 3,911    
Net unrealized gain (loss) on AFS securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income (loss), before tax: 13,069 7,250    
Income taxes related to items of accumulated other comprehensive (income) loss: (3,046) (1,703)    
Accumulated other comprehensive income (loss) 10,021 5,547 $ (8,665) $ (1,713)
Net unrealized gain (loss) on effective cash flow hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income (loss), before tax: 3,144 (628)    
Income taxes related to items of accumulated other comprehensive (income) loss: (733) 149    
Accumulated other comprehensive income (loss) 2,413 (479) (2,249) (2,250)
Net unrealized gain (loss) on post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income (loss), before tax: (1,850) (1,512)    
Income taxes related to items of accumulated other comprehensive (income) loss: 432 355    
Accumulated other comprehensive income (loss) $ (1,418) $ (1,157) $ (888) $ (591)