Derivatives Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative, higher weighted average receive rate range			0.56%
Derivative, lower weighted average receive rate range			0.54%
Derivative, lower weighted average pay rate range			2.10%
Derivative, higher weighted average pay rate range			2.52%
Cash flow hedging [Member] | Interest rate swap [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 30,000	$ 80,000
Collateral already posted, aggregate fair value		$ 740
Derivative, weighted average receive rate		0.88%
Derivative, weighted average pay rate		2.52%
Cash flow hedging [Member] | Interest rate swap [Member] | Designated as hedging instrument [Member] | Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Interest rate cash flow hedge liability at fair value		$ 774	$ 261
Cash flow hedging [Member] | Terminated interest rate swap [Member]
Derivatives, Fair Value [Line Items]
Derivative termination fee paid		541
Cash flow hedging [Member] | Terminated interest rate swap [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, notional amount		$ 70,000
Scenario, forecast [Member] | Cash flow hedging [Member] | Interest rate swap [Member] | Designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments, gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred	$ 601