Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income, Before tax amount	$ (186)	$ 4,196
Net unrealized holding gains (losses) on available-for-sale securities:
Unrealized holding gains arising during the period, Before tax amount	5,812	4,391
Reclassification adjustment for losses included in net income, Before tax amount		39
Other comprehensive income, Before tax amount	5,812	4,430
Unrealized holding gains arising during the period, Tax expense (benefit)	1,221	922
Reclassification adjustment for losses included in net income, Tax expense (benefit)		8
Other comprehensive income, Tax expense (benefit)	1,221	930
Unrealized holding gains arising during the period, Net of tax amount	4,591	3,469
Reclassification adjustment for losses included in net income, Net of tax amount		31
Other comprehensive income, Net of tax amount	4,591	3,500
Total comprehensive income, Before tax amount	5,626	8,626
Tax expense (benefit)	(406)	817
Total comprehensive income, Tax expense (benefit)	815	1,747
Net (loss) income	220	3,379
Total comprehensive income, Net of tax amount	$ 4,811	$ 6,879