Accumulated Other Comprehensive Income (Changes in AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,007
Other comprehensive income, net of tax	1,204	$ 482
Ending balance	2,646	1,007
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(679)	(935)
Other comprehensive gain before reclassifications	278	256
Reclassification adjustment - legislative tax rate change	(79)	0
Amounts reclassified from accumulated other comprehensive income	0	0
Other comprehensive income, net of tax	199	256
Ending balance	(480)	(679)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,686	1,460
Other comprehensive gain before reclassifications	1,079	775
Reclassification adjustment - legislative tax rate change	514	0
Amounts reclassified from accumulated other comprehensive income	(153)	(549)
Other comprehensive income, net of tax	1,440	226
Ending balance	$ 3,126	$ 1,686