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Derivative and Hedging Activities - Gains and Losses on Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivatives Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in Income on derivatives $ (420) $ 306 $ 237
Derivatives Not Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Other Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in Income on derivatives (422) 186 238
Derivatives Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Other Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in Income on derivatives 2 120 (1)
Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in Income on derivatives (205) (394) (122)
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in Income on derivatives $ (205) $ (394) $ (122)