Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 5,287	$ 9,685	$ 33,341	$ 15,422
Other comprehensive income:
Change in net actuarial gain	36	27	108	80
Tax effect on change in net actuarial gain	(8)	(6)	(23)	(17)
Unrealized holding gains arising during the period	1,777	342	13,010	1,909
Tax effect on unrealized holding gains arising during the period	(373)	(72)	(2,732)	(401)
Reclassification adjustment for (gains) losses included in net income	(175)	166	(4,376)	159
Tax effect on reclassification adjustment for gains (losses) included in net income	36	(35)	919	(33)
Other comprehensive income, net of tax	1,293	422	6,906	1,697
Comprehensive income	$ 6,580	$ 10,107	$ 40,247	$ 17,119