Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 686,257	$ 643,867
Other comprehensive income (loss)	(25)	6
Ending Balance	666,466	646,458
Unrealized Gains (Losses) on Securities Available-for-Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	0	(726)
Other comprehensive income (loss), before reclassifications	0	0
Reclassification from other comprehensive (income) loss		726
Other comprehensive income (loss)	0	726
Ending Balance	0	0
Reclassification from AOCI, tax		(254)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	9	(5)
Other comprehensive income (loss), before reclassifications	(25)	6
Reclassification from other comprehensive (income) loss		0
Other comprehensive income (loss)	(25)	6
Ending Balance	(16)	1
Other comprehensive income (loss), before reclassifications, tax	$ (9)	$ (3)