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DERIVATIVE INSTRUMENTS - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 30, 2015
Sep. 30, 2013
Interest Rate Swap Maturing on September 27, 2018 | Cash Flow Hedging          
Derivative [Line Items]          
Derivatives, notional amount         $ 50,000,000
Derivative, notional amount terminated   $ 75,000,000      
Interest Rate Swap Maturing on January 30, 2022 | Cash Flow Hedging          
Derivative [Line Items]          
Derivatives, notional amount       $ 25,000,000  
Interest rate swaps on deposits and other borrowings          
Derivative [Line Items]          
Derivatives asset, fair values     $ 918,000    
Gain (Loss) on Securitization of Financial Assets          
Derivative [Line Items]          
Gain (loss) on derivatives $ (12,400,000) 2,200,000 $ (8,000,000)    
Other Assets          
Derivative [Line Items]          
Derivatives asset, fair values 1,005,000 17,968,000      
Other Assets | Foreign exchange contracts          
Derivative [Line Items]          
Derivatives asset, fair values $ 0 $ 47,000