Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income (loss)	$ 5,090	$ (3,350)	$ 5,737	$ 636
Other comprehensive income:
Change in net actuarial gain	26	35	53	70
Tax effect on change in net actuarial gain	(5)	(12)	(11)	(24)
Unrealized holding gains arising during the period	1,962	2,654	1,567	7,900
Tax effect on unrealized holding gains arising during the period	(412)	(929)	(329)	(2,765)
Reclassification adjustment for (gains) losses included in net income	(22)	10	(7)	(2,491)
Tax effect on reclassification adjustment for (gains) losses included in net income	5	(3)	2	872
Other comprehensive income, net of tax	1,554	1,755	1,275	3,562
Comprehensive income (loss)	$ 6,644	$ (1,595)	$ 7,012	$ 4,198