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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss $ (3,662) $ (4,326)
Net unrealized holding loss on AFS securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (2,153) (3,269)
Income taxes related to items of accumulated other comprehensive loss: 796 1,144
Net unrealized loss on effective cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (2,989) (2,766)
Income taxes related to items of accumulated other comprehensive loss: 1,051 968
Net unrealized holding loss on post-retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (565) (622)
Income taxes related to items of accumulated other comprehensive loss: $ 198 $ 219