Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Interest rate swap notional amount	$ 148,800		$ 148,800		$ 155,300
Unrealized gain on derivative, net of tax	$ 244	$ (200)	$ 1,077	$ 165
Interest Rate Swap [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Fixed interest rate	1.4935%		1.4935%
Fair value of interest rate swap	$ 3,400		$ 3,400		$ 2,000
Unrealized gain on interest rate swap			1,400
Unrealized gain on derivative, net of tax			$ 1,100