Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total
Balance at Dec. 31, 2014	$ 107	$ 170,521	$ (23,947)	$ 157,853	$ 304,534
Balance (in shares) at Dec. 31, 2014	10,673,292
Increase (Decrease) in Stockholders' Equity
Stock based compensation		1,584			1,584
Exercise of warrant	$ 7	6,863			$ 6,870
Exercise of warrant (in shares)	719,075				228,316
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes	$ 1	(949)			$ (948)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)	74,031
Net income (loss)				1,100	1,100
Other comprehensive income (loss), net of tax			(5,441)		(5,441)
Balance at Dec. 31, 2015	$ 115	178,019	(29,388)	158,953	307,699
Balance (in shares) at Dec. 31, 2015	11,466,398
Increase (Decrease) in Stockholders' Equity
Stock based compensation		2,303			2,303
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes		(364)			(364)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)	46,881
Net income (loss)				1,106	1,106
Other comprehensive income (loss), net of tax			(5,830)		(5,830)
Balance at Dec. 31, 2016	$ 115	179,958	(35,218)	160,059	304,914
Balance (in shares) at Dec. 31, 2016	11,513,279
Increase (Decrease) in Stockholders' Equity
Cumulative effect of adoption of new accounting standard for stock compensation				550	550
Stock based compensation		2,827			2,827
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes	$ 1	(96)			(95)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)	74,684
Net income (loss)				(107,241)	(107,241)
Other comprehensive income (loss), net of tax			19,254		19,254
Balance at Dec. 31, 2017	$ 116	$ 182,689	$ (15,964)	$ 53,368	$ 220,209
Balance (in shares) at Dec. 31, 2017	11,587,963