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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss) $ 877 $ (11,802)
Net unrealized gain (loss) on AFS securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: 7,242 (11,304)
Income taxes related to items of accumulated other comprehensive (income) loss: (1,693) 2,641
Net unrealized loss on effective cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: (4,936)  
Income taxes related to items of accumulated other comprehensive (income) loss: 1,154  
Net unrealized loss on effective cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax:   (2,934)
Income taxes related to items of accumulated other comprehensive (income) loss:   685
Net unrealized loss on post-retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: (1,162) (1,162)
Income taxes related to items of accumulated other comprehensive (income) loss: $ 272 $ 272