Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) contract
Derivative [Line Items]
Number of instruments held | contract	3
Forward Contract effective July 18 2016 [Member]
Derivative [Line Items]
Derivative, notional amount	$ 40,000
Cash flow hedges, notional amount	$ 40,000
Swaption interest rate	2.98%
Term of contract	3 years
Forward Contract effective April 18 2016 [Member]
Derivative [Line Items]
Derivative, notional amount	$ 30,000
Cash flow hedges, notional amount	$ 30,000
Swaption interest rate	2.89%
Term of contract	4 years 6 months
Forward Contract effective October 18 2016 [Member]
Derivative [Line Items]
Derivative, notional amount	$ 40,000
Cash flow hedges, notional amount	$ 40,000
Swaption interest rate	2.841%
Term of contract	3 years
Fair Value Hedging [Member]
Derivative [Line Items]
Number of instruments held | contract	2
Fair Value Hedging [Member] | Commercial Real Estate [Member] | Interest Rate Swap effective January 15 2015 [Member]
Derivative [Line Items]
Derivative, notional amount	$ 9,950
Swaption interest rate	4.33%
Term of contract	10 years
Fair Value Hedging [Member] | Commercial Real Estate [Member] | Interest Rate Swap effective December 18 2015 [Member]
Derivative [Line Items]
Derivative, notional amount	$ 11,300
Swaption interest rate	4.30%
Term of contract	10 years