Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consolidated Statements of Comprehensive Income [Abstract]
Net income (loss)	$ 6,701	$ 13,029	$ (57,609)	$ 28,054
Other comprehensive income (loss):
Change in net actuarial gain	35	37	69	72
Tax effect on change in net actuarial gain	(7)	(8)	(14)	(15)
Unrealized holding gains arising during the period	8,430	3,460	1,443	11,233
Tax effect on unrealized holding gains arising during the period	(1,771)	(727)	(304)	(2,359)
Reclassification adjustment for losses (gains) included in net income (loss)	414	(60)	(5,222)	(4,201)
Tax effect on reclassification adjustment for (losses) gains included in net income (loss)	(87)	13	1,097	883
Other comprehensive income (loss), net of tax	7,014	2,715	(2,931)	5,613
Comprehensive income (loss)	$ 13,715	$ 15,744	$ (60,540)	$ 33,667