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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (3,433)	$ 3,660	$ 6,570	$ 11,892
Other comprehensive income (loss), net of reclassification adjustment:
Unrealized holding gains (losses) on available for sale securities	(935)	86	(4,833)	1,993
Tax effect	197	(29)	1,015	(678)
Pension liability adjustment	143	426	429	946
Tax effect	(30)	(144)	(90)	(321)
Total other comprehensive income (loss)	(625)	339	(3,479)	1,940
Comprehensive income (loss)	$ (4,058)	$ 3,999	$ 3,091	$ 13,832

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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