Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2011	$ 128,197us-gaap_StockholdersEquity	$ 419	$ 122,514	$ 1,195	$ 4,089	$ (20)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(38,454)us-gaap_NetIncomeLoss	0	0	(38,454)	0	0
Total other comprehensive income (loss), net of taxes	(2,261)	0	0	0	(2,261)	0
Stock-based compensation plans:
Issuance of stock	200	2	198	0	0	0
Issuance of stock through dividend reinvestment plan	12	0	12	0	0	0
Ending Balance at Dec. 31, 2012	87,694us-gaap_StockholdersEquity	421	122,724	(37,259)	1,828	(20)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	10,004us-gaap_NetIncomeLoss	0	0	10,004	0	0
Total other comprehensive income (loss), net of taxes	(6,641)	0	0	0	(6,641)	0
Stock-based compensation plans:
Issuance of stock	378	1	377	0	0	0
Issuance of stock through dividend reinvestment plan	4	0	4	0	0	0
Ending Balance at Dec. 31, 2013	91,439us-gaap_StockholdersEquity	422	123,105	(27,255)	(4,813)	(20)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	29,142us-gaap_NetIncomeLoss	0	0	29,142	0	0
Total other comprehensive income (loss), net of taxes	6,389	0	0	0	6,389	0
Stock-based compensation plans:
Issuance of stock	294	8	286	0	0	0
Issuance of stock through dividend reinvestment plan	1	0	1	0	0	0
Ending Balance at Dec. 31, 2014	$ 127,265us-gaap_StockholdersEquity	$ 430	$ 123,392	$ 1,887	$ 1,576	$ (20)

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