Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balance at Dec. 31, 2011	$ 136,196	$ 102	$ 164,328	$ (57,518)	$ 29,284
Balance (in shares) at Dec. 31, 2011		10,190,526
Increase (Decrease) in Stockholders' Equity
Stock based compensation	840		840
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes	(45)		(45)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)		55,247
Net income	5,728				5,728
Other comprehensive income, net of tax	33,387			33,387
Balance at Jun. 30, 2012	176,106	102	165,123	(24,131)	35,012
Balance (in shares) at Jun. 30, 2012		10,245,773
Balance at Dec. 31, 2012	276,860	103	165,941	(28,450)	139,266
Balance (in shares) at Dec. 31, 2012		10,291,897
Increase (Decrease) in Stockholders' Equity
Stock based compensation	1,151		1,151
Sale of stock under warrants (in shares)		297
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes	(392)		(392)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)		44,290
Net income	5,798				5,798
Other comprehensive income, net of tax	242			242
Balance at Jun. 30, 2013	$ 283,659	$ 103	$ 166,700	$ (28,208)	$ 145,064
Balance (in shares) at Jun. 30, 2013		10,336,484