Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	$ 163,736	$ 154,299
Other comprehensive income	(2,069)	742
Balances	164,977	157,626
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(1,309)	(993)
Other comprehensive income	(2,069)	742
Balances	(3,378)	(251)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(1,255)	(931)
Other comprehensive income	(2,073)	738
Balances	(3,328)	(193)
Unrealized Gains Losses On Securities Transferred From Available For Sale To Held To Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balances	(54)	(62)
Other comprehensive income		4
Other comprehensive income, transferred from Available for sale to Held to maturity	4
Balances	$ (50)	$ (58)