Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Balance, beginning		$ (1,979)
Total other comprehensive (loss) income, net of tax		(7,448)	$ 5,754	$ (9,371)
Balance, end		(9,427)	(1,979)
Available-For-Sale Debt Securities
Accumulated Other Comprehensive Loss
Balance, beginning		5,031	1,639	13,935
Other comprehensive income (loss) before reclassification		(11,653)	2,110	(13,113)
Reclassification adjustments for losses included in net income		9	391	817
Reclassifications to retained earnings	[1]		891
Total other comprehensive (loss) income, net of tax		(11,644)	3,392	(12,296)
Balance, end		(6,613)	5,031	1,639
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Loss
Balance, beginning		(7,010)	(9,021)	(11,946)
Other comprehensive income (loss) before reclassification		2,453	248	(1,006)
Reclassification adjustments for losses included in net income		1,743	3,005	3,931
Reclassifications to retained earnings	[1]		(1,242)
Total other comprehensive (loss) income, net of tax		4,196	2,011	2,925
Balance, end		(2,814)	(7,010)	(9,021)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Balance, beginning		(1,979)	(7,382)	1,989
Other comprehensive income (loss) before reclassification		(9,200)	2,358	(14,119)
Reclassification adjustments for losses included in net income		1,752	3,396	4,748
Reclassifications to retained earnings	[1]		(351)
Total other comprehensive (loss) income, net of tax		(7,448)	5,403	(9,371)
Balance, end		$ (9,427)	$ (1,979)	$ (7,382)

[1] Reclassifications were due to the one-time revaluation of the net deferred tax asset as a result of the Tax Act.