Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ 3,757	$ 123,468	$ 160,570	$ 688	$ (25,201)
Equity based compensation		(416)
Shares issued under employee benefit plans					175
Shares issued under employee benefit plans		(175)
Net income (loss)			(86,541)			$ (86,541)
Change in net actuarial gain, net of tax				82
Unrealized holding gains arising during period, net of tax				3,277
Reclassification adjustment for losses included in net (loss) income, net of tax				(4,433)
Ending balance at Sep. 30, 2020	3,757	122,877	74,029	(386)	(25,026)	175,251
Balance at Dec. 31, 2019	3,757	123,468	160,570	688	(25,201)
Ending balance at Dec. 31, 2020	3,757	122,893	65,699	383	(25,026)	167,706
Balance at Jun. 30, 2020	3,757	122,729	102,417	(2,243)	(25,032)
Equity based compensation		154
Shares issued under employee benefit plans					6
Shares issued under employee benefit plans		(6)
Net income (loss)			(28,388)			(28,388)
Change in net actuarial gain, net of tax				27
Unrealized holding gains arising during period, net of tax				2,138
Reclassification adjustment for losses included in net (loss) income, net of tax				(308)
Ending balance at Sep. 30, 2020	3,757	122,877	74,029	(386)	(25,026)	175,251
Balance at Dec. 31, 2020	3,757	122,893	65,699	383	(25,026)	167,706
Balance at Dec. 31, 2020	3,757	122,893	65,699	383	(25,026)	167,706
Ending balance at Jun. 30, 2021	3,757	122,782	73,825	(687)	(24,761)
Balance at Dec. 31, 2020	3,757	122,893	65,699	383	(25,026)	167,706
Equity based compensation		158
Shares issued under employee benefit plans					278
Shares issued under employee benefit plans		(278)
Net income (loss)			11,571			11,571
Change in net actuarial gain, net of tax				103
Unrealized holding gains arising during period, net of tax				2,420
Reclassification adjustment for losses included in net (loss) income, net of tax				(4,178)
Ending balance at Sep. 30, 2021	3,757	122,773	77,270	(1,272)	(24,748)	177,780
Ending balance at Jun. 30, 2021	3,757	122,782	73,825	(687)	(24,761)
Equity based compensation		4
Shares issued under employee benefit plans					13
Shares issued under employee benefit plans		(13)
Net income (loss)			3,445			3,445
Change in net actuarial gain, net of tax				34
Unrealized holding gains arising during period, net of tax				218
Reclassification adjustment for losses included in net (loss) income, net of tax				(837)
Ending balance at Sep. 30, 2021	$ 3,757	$ 122,773	$ 77,270	$ (1,272)	$ (24,748)	$ 177,780