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Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2016 derivative	Jun. 30, 2016 USD ($) derivative	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) derivative	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Number of derivative instruments terminated | derivative	1
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness, derivatives		$ 39	$ 70	$ 201	$ 58
Fair value hedge | Interest income
Derivatives, Fair Value [Line Items]
(Decrease) increase in value of designated interest rate swaps recognized in interest income		(190)	966	(1,066)	420
Payment on interest rate swaps recorded in interest income		(138)	(233)	(313)	(469)
Increase (decrease) in value of hedged loans recognized in interest income		240	(1,023)	1,290	(451)
Decrease in value of yield maintenance agreement recognized against interest income		(11)	(13)	(23)	(27)
Net loss on derivatives recognized against interest income		(99)	$ (303)	(112)	$ (527)
Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Accrued interest on swaps		$ 16		$ 16		$ 28
Interest rate swap | Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative		6		6
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Asset derivatives		$ 0		$ 0		4,407
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives		22,527		22,527		22,187
Interest rate contract | Designated as hedging instrument | Fair value hedge | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives		0		0		3
Interest rate contract | Designated as hedging instrument | Fair value hedge | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Liability derivatives		$ 2,721		$ 2,721		$ 1,658

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