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Derivative Financial Instruments and Hedging Activities - Narrative (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Sep. 30, 2016 derivative	Apr. 30, 2016 derivative	Dec. 31, 2016 USD ($) derivative	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Number of Instruments Terminated | derivative	1	1
Interest rate contracts fair value, Asset derivatives			$ 55	$ 3
Interest rate contracts fair value			933	1,658
Fair value hedge
Derivatives, Fair Value [Line Items]
Net hedge ineffectiveness gain (loss), derivatives			113	(80)	$ 194
Fair value hedge | Interest income
Derivatives, Fair Value [Line Items]
Increase (decrease) in value of designated interest rate swaps due to LIBOR interest rate movements recognized in interest income			778	280	(377)
Payment on interest rate swaps recorded in interest income			(556)	(918)	(1,002)
(Decrease) increase in value of hedged loans recognized in interest income			(571)	(308)	662
Decrease in value of yield maintenance agreement recognized against interest income			(94)	(52)	(91)
Net loss on derivatives recognized against interest income			(443)	(998)	$ (808)
Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivatives, accrued interest, interest rate swaps			$ 13	28
Interest rate swap | Fair value hedge | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Number of derivative instruments | derivative			5
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amounts, Asset derivatives			$ 4,217	4,407
Interest rate swap | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts notional amount, Liability derivatives			15,495	22,187
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other assets
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value, Asset derivatives			55	3
Interest rate contract | Fair value hedge | Designated as hedging instrument | Other liabilities
Derivatives, Fair Value [Line Items]
Interest rate contracts fair value			$ 933	$ 1,658

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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