Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Interest rate swap notional amount	$ 152,000		$ 155,300
Unrealized gain on derivative, net of tax	$ 833	$ 365
Interest Rate Swap [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Fixed interest rate	1.4935%
Fair value of interest rate swap	$ 3,100		$ 2,000
Unrealized gain on interest rate swap	1,100
Unrealized gain on derivative, net of tax	$ 800