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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss $ (5,628) $ (11,802)
Net unrealized loss on AFS securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (2,404) (11,304)
Income taxes related to items of accumulated other comprehensive loss: (560) 2,641
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (3,779)  
Income taxes related to items of accumulated other comprehensive loss: (883)  
Net unrealized loss on effective cash flow hedging derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax:   (2,934)
Income taxes related to items of accumulated other comprehensive loss:   685
Net unrealized loss on post-retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other accumulated comprehensive loss, before tax: (1,162) (1,162)
Income taxes related to items of accumulated other comprehensive loss: $ (274) $ 272