Accumulated Other Comprehensive Income (Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 2,646
Other comprehensive income (loss), net of tax	$ (736)	$ 542	(1,980)	$ 956	$ 1,204
Ending balance	(1,441)	1,963	(1,441)	1,963	2,646
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(480)	(679)	(679)
Other comprehensive gain before reclassifications			207	110
Other comprehensive income (loss), net of tax			207	110
Ending balance	(273)	(569)	(273)	(569)	(480)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			3,126	1,686	1,686
Other comprehensive gain before reclassifications			(2,085)	1,001
Reclassification adjustment - gains on equity securities			(2,107)	0
Amounts reclassified from accumulated other comprehensive income (loss)			(102)	(155)
Other comprehensive income (loss), net of tax			(4,294)	846
Ending balance	$ (1,168)	$ 2,532	$ (1,168)	$ 2,532	$ 3,126