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, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative(Loss) Gain	$ (63)	$ 70	$ 36
Interest Rate Swap Contracts-Commercial Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative(Loss) Gain	(16)	(8)	(24)
Interest Rate Lock Commitments-Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative(Loss) Gain	(25)	26	150
Forward Sale Contracts-Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivative(Loss) Gain	$ (22)	$ 52	$ (90)