Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Comprehensive Income [Abstract]
Net (loss) income	$ (64,310)	$ 15,025
Other comprehensive (loss) income:
Change in net actuarial gain	34	35
Tax effect on change in net actuarial gain	(7)	(7)
Unrealized holding (losses) gains arising during the period	(6,987)	7,773
Tax effect on unrealized holding losses (gains) arising during the period	1,467	(1,632)
Reclassification adjustment for gains included in net income	(5,636)	(4,141)
Tax effect on reclassification adjustment for gains included in net income	1,184	870
Other comprehensive (loss) income, net of tax	(9,945)	2,898
Comprehensive (loss) income	$ (74,255)	$ 17,923