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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (loss) $ 9,405   $ 3,911 $ 3,045   $ (11,802)
Net unrealized gain (loss) on AFS securities            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income (loss), before tax: 15,264   7,342      
Income taxes related to items of accumulated other comprehensive (income) loss: (3,583)   (1,793)      
Accumulated other comprehensive income (loss) 11,681 $ 11,412 5,550 8,000 $ 5,547 (8,665)
Net unrealized gain (loss) on effective cash flow hedging derivatives            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income (loss), before tax: (1,461)   (718)      
Income taxes related to items of accumulated other comprehensive (income) loss: 342   237      
Accumulated other comprehensive income (loss) (1,119) (1,734) (482) (4,067) (3,782) (2,249)
Net unrealized gain (loss) on post-retirement plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Other accumulated comprehensive income (loss), before tax: (1,512)   (1,512)      
Income taxes related to items of accumulated other comprehensive (income) loss: 355   355      
Accumulated other comprehensive income (loss) $ (1,157) $ (1,157) $ (1,157) $ (888) $ (888) $ (888)