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Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Total Derivative (Loss) Gain $ 58 $ (63) $ 70
Interest Rate Swap Contracts—Commercial Loans      
Derivative Instruments, Gain (Loss) [Line Items]      
Total Derivative (Loss) Gain 17 (16) (8)
Interest Rate Lock Commitments—Mortgage Loans      
Derivative Instruments, Gain (Loss) [Line Items]      
Total Derivative (Loss) Gain (11) (25) 26
Forward Sale Contracts—Mortgage Loans      
Derivative Instruments, Gain (Loss) [Line Items]      
Total Derivative (Loss) Gain $ 52 $ (22) $ 52