Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss
Balance, beginning		$ (9,427)
Total other comprehensive income (loss), net of tax		49,653	$ (7,448)	$ 5,754
Balance, end		40,226	(9,427)
Available-For-Sale Debt Securities
Accumulated Other Comprehensive Loss
Balance, beginning		(6,613)	5,031	1,639
Other comprehensive income (loss) before reclassification		57,607	(11,653)	2,110
Reclassification adjustments for (gains) losses included in net income		(10,768)	9	391
Reclassifications to retained earnings	[1]			891
Total other comprehensive income (loss), net of tax		46,839	(11,644)	3,392
Balance, end		40,226	(6,613)	5,031
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Loss
Balance, beginning		(2,814)	(7,010)	(9,021)
Other comprehensive income (loss) before reclassification		(5,261)	2,453	248
Reclassification adjustments for (gains) losses included in net income		8,075	1,743	3,005
Reclassifications to retained earnings	[1]			(1,242)
Total other comprehensive income (loss), net of tax		2,814	4,196	2,011
Balance, end		0	(2,814)	(7,010)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Loss
Balance, beginning		(9,427)	(1,979)	(7,382)
Other comprehensive income (loss) before reclassification		52,346	(9,200)	2,358
Reclassification adjustments for (gains) losses included in net income		(2,693)	1,752	3,396
Reclassifications to retained earnings	[1]			(351)
Total other comprehensive income (loss), net of tax		49,653	(7,448)	5,403
Balance, end		$ 40,226	$ (9,427)	$ (1,979)

[1] Reclassifications were due to the one-time revaluation of the net deferred tax asset as a result of the Tax Act. For additional information on the Tax Act, see Note 15.