Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2010 Series C Preferred Stock	Jun. 30, 2013 Series C Preferred Stock
Earnings Per Share
Number of shares issued to various institutional investors					21,004
Number of common stock into which preferred stock are convertible (in shares)						5,601,000
Repurchase of warrant	$ 140,000		$ 140,000
Reconciliation of factors used in computing basic and diluted earnings (loss) per common share
Net income available to common shareholders	2,793,000	2,679,000	4,973,000	3,548,000
Less: net income allocated to Series C Preferred Stock	489,000	470,000	871,000	623,000
Net income allocated to common shareholders	$ 2,304,000	$ 2,209,000	$ 4,102,000	$ 2,925,000
Weighted average common shares outstanding for basic earnings per common share	26,336,244	26,290,480	26,332,793	26,289,907
Dilutive effect of stock options outstanding, using the treasury stock method (in shares)	35,648	27,011	46,123	28,058
Shares used in computing diluted earnings per common share	26,371,892	26,317,491	26,378,916	26,317,965
Basic earnings per share (in dollars per share)	$ 0.09	$ 0.08	$ 0.16	$ 0.11
Diluted earnings per share (in dollars per share)	$ 0.09	$ 0.08	$ 0.16	$ 0.11