Earnings Per Share (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings per common share - Basic
Net income attributable to OBCI	$ 349,052	$ 364,345
Weighted average number of common shares outstanding	8,398,385	8,106,886
Earnings per common share - Basic	$ 0.04	$ 0.04
Earnings per common share - Diluted
Net income attributable to OBCI	$ 349,052	$ 364,345
Weighted average number of common shares outstanding	8,398,385	8,106,886
Dilutive effect of employee stock options	283,723	359,134
Weighted average number of common shares outstanding - assuming dilution	8,682,108	8,466,020
Earnings per common share - Diluted	$ 0.04	$ 0.04
Earnings Per Share (Textual)
Anti-dilutive stock options outstanding	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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