Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income, Before tax amount	$ 6,323	$ (186)
Net unrealized holding (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains arising during the period, Before tax amount	(8,006)	5,812
Reclassification adjustment for (gains) losses included in net income, Before tax amount	(3)
Other comprehensive (loss) income, Before tax amount	(8,009)	5,812
Unrealized holding (losses) gains arising during the period, Tax expense (benefit)	(1,681)	1,221
Reclassification adjustment for (gains) losses included in net income, Tax expense (benefit)	(1)
Other comprehensive (loss) income, Tax expense (benefit)	(1,682)	1,221
Unrealized holding (losses) gains arising during the period, Net of tax amount	(6,325)	4,591
Reclassification adjustment for (gains) losses included in net income, Net of tax amount	(2)
Other comprehensive (loss) income, Net of tax amount	(6,327)	4,591
Total comprehensive (loss) income, Before tax amount	(1,686)	5,626
Tax expense (benefit)	1,273	(406)
Total comprehensive (loss) income, Tax expense (benefit)	(409)	815
Net income	5,050	220
Total comprehensive (loss) income, Net of tax amount	$ (1,277)	$ 4,811