Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings per common share - Basic
Net income attributable to OBCI	$ 770,618	$ 1,137,685	$ 1,497,922	$ 2,175,382
Weighted average number of common shares outstanding	8,288,613	7,997,613	8,201,376	7,916,932
Earnings per common share – basic	$ 0.09	$ 0.14	$ 0.18	$ 0.27
Earnings per common share – Diluted
Net income attributable to OBCI	$ 770,618	$ 1,137,685	$ 1,497,922	$ 2,175,382
Weighted average number of common shares outstanding	8,288,613	7,997,613	8,201,376	7,916,932
Effect of employee stock-based awards	306,893	540,193	339,401	477,481
Weighted average number of common shares outstanding - assuming dilution	8,595,506	8,537,806	8,540,777	8,394,413
Earnings per common share – diluted	$ 0.09	$ 0.13	$ 0.18	$ 0.26
Earnings Per Share (Textual)
Anti-dilutive stock options outstanding	0	0	0	0