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Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2016 derivative	Mar. 31, 2016 USD ($) derivative	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness, derivatives		$ 162	$ 11
Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Accrued interest on swaps		$ 26		$ 28
Interest rate swap | Designated as hedging instrument | Fair value hedge
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative		7
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		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		26,092		22,187
Interest income | Fair value hedge
Derivatives, Fair Value [Line Items]
Decrease in value of designated interest rate swaps recognized in interest income		(876)	(546)
Payment on interest rate swaps recorded in interest income		(174)	(235)
Increase in value of hedged loans recognized in interest income		1,050	571
Decrease in value of yield maintenance agreement recognized against interest income		(12)	(14)
Net loss on derivatives recognized against interest income		(12)	$ (224)
Assets and liabilities at fair value measured on a recurring basis | 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		3
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Fair value hedge | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Liability derivatives		$ 2,531		$ 1,658
Subsequent event
Derivatives, Fair Value [Line Items]
Number of derivative instruments terminated | derivative	1

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