Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings per common share - Basic
Net income attributable to OBCI	$ 295,552	$ 903,093	$ 393,323	$ 1,537,324
Weighted average number of common shares outstanding	8,935,951	8,914,274	8,926,176	8,808,219
Earnings per common share - Basic	$ 0.03	$ 0.1	$ 0.04	$ 0.17
Earnings per common share - Diluted
Net income attributable to OBCI	$ 295,552	$ 903,093	$ 393,323	$ 1,537,324
Weighted average number of common shares outstanding	8,935,951	8,914,274	8,926,176	8,808,219
Dilutive effect of employee stock-based awards	77,889	86,900	90,411	114,372
Weighted average number of common shares outstanding - assuming dilution	9,013,840	9,001,174	9,016,587	8,922,591
Earnings per common share - Diluted	$ 0.03	$ 0.1	$ 0.04	$ 0.17