Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 686,257	$ 643,867	$ 605,224
Reclassification from other comprehensive (income) loss		726
Other comprehensive income (loss)	20	14	(309)
Balance	720,940	686,257	643,867
Unrealized Gains (Losses) on  Securities Available-for-Sale
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	0	(726)
Foreign currency translation adjustments, net of tax	0	0
Reclassification from other comprehensive (income) loss		726
Other comprehensive income (loss)	0	726
Balance	0	0	(726)
Reclassification from AOCI, tax	(254)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	9	(5)
Foreign currency translation adjustments, net of tax	20	14
Reclassification from other comprehensive (income) loss		0
Other comprehensive income (loss)	20	14
Balance	29	9	$ (5)
Other comprehensive income (loss) before reclassification, tax	$ (7)	$ (5)