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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive (loss) income $ 4,161 $ 9,766 $ (3,305) $ 6,579
Net unrealized holding gain on AFS securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income/(loss), before tax 10,034 25,176    
Income taxes related to items of accumulated other comprehensive income/(loss) (4,026) (9,636)    
Accumulated other comprehensive (loss) income 6,008 15,540 3,880 9,916
Net (loss) on effective cash flow hedging derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income/(loss), before tax 0 (6,573)    
Income taxes related to items of accumulated other comprehensive income/(loss) 0 2,589    
Accumulated other comprehensive (loss) income 0 (3,984) (5,108) (1,969)
Net unrealized holding (loss) on pension plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other accumulated comprehensive income/(loss), before tax (3,048) (2,954)    
Income taxes related to items of accumulated other comprehensive income/(loss) 1,201 1,164    
Accumulated other comprehensive (loss) income $ (1,847) $ (1,790) $ (2,077) $ (1,368)