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	1,343		1,343
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes	(53)		(53)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)		56,109
Net income	11,343				11,343
Other comprehensive income, net of tax	33,646			33,646
Balance at Sep. 30, 2012	182,475	102	165,618	(23,872)	40,627
Balance (in shares) at Sep. 30, 2012		10,246,635
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	1,886		1,886
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	(426)		(426)
Common stock issued for stock compensation plans, net of shares withheld and withholding paid for employee taxes (in shares)		46,543
Net income	7,859				7,859
Other comprehensive income, net of tax	382			382
Balance at Sep. 30, 2013	$ 286,561	$ 103	$ 167,401	$ (28,068)	$ 147,125
Balance (in shares) at Sep. 30, 2013		10,338,737