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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - Fair value hedge $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) derivative	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) derivative	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness, derivatives	$ 79	$ (48)	$ 21	$ 125
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Accrued interest on swaps	$ 34		$ 34		$ 41
Interest rate swap | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative	8		8
Interest rate swap | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Asset derivatives	$ 0		$ 0		4,589
Interest rate swap | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives	29,999		29,999		26,899
Interest income
Derivatives, Fair Value [Line Items]
(Decrease) increase in value of designated interest rate swaps recognized in interest income	(813)	21	(393)	334
Payment on interest rate swaps recorded in interest income	(231)	(251)	(700)	(755)
Increase (decrease) in value of hedged loans recognized in interest income	905	(54)	453	(133)
Decrease in value of yield maintenance agreement recognized against interest income	(13)	(15)	(39)	(77)
Net loss on derivatives recognized against interest income	(152)	$ (299)	(679)	$ (631)
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives	0		0		61
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Liability derivatives	$ 2,328		$ 2,328		$ 1,996

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