Derivative Financial Instruments (Narrative) (Details) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2016 USD ($) contract	Jul. 31, 2009 USD ($) contract	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Gain on derivative			$ 86
Deferred tax asset on gain on derivative			$ 34
Cash flow hedge ineffectiveness			0
Interest Rate Swap [Member]
Derivative [Line Items]
Interest rate swap notional amount	$ 30,000	$ 20,000
Number of interest rate swap contracts | contract	4	3
Interest rate swap fair value			$ 800	$ 700
Swap Contract - 3-Year $5 million [Member]
Derivative [Line Items]
Interest rate swap notional amount	$ 5,000
Derivative, maturity date	Jun. 17, 2019
Swap Contract - 5-Year $5 million [Member]
Derivative [Line Items]
Interest rate swap notional amount	$ 5,000
Derivative, maturity date	Mar. 17, 2021
Swap Contract - 10-Year $15 million [Member]
Derivative [Line Items]
Interest rate swap notional amount	$ 15,000
Derivative, maturity date	Mar. 17, 2026
Swap Contract- 7 year $5 Million [Member]
Derivative [Line Items]
Interest rate swap notional amount	$ 5,000
Derivative, maturity date	Mar. 17, 2023