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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss $ (1,435) $ (4,326)
Net unrealized holding gain/(loss) on AFS securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: 1,849 (3,269)
Income taxes related to items of accumulated other comprehensive loss: (695) 1,144
Net unrealized loss on effective cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: (3,570) (2,766)
Income taxes related to items of accumulated other comprehensive loss: 1,341 968
Net unrealized holding loss on post-retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive income (loss), before tax: (577) (622)
Income taxes related to items of accumulated other comprehensive loss: $ 217 $ 219