Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings per common share - Basic
Net income attributable to OBCI	$ 903,093	$ 621,665	$ 1,537,324	$ 1,143,333
Weighted average number of common shares outstanding	8,914,274	8,605,183	8,808,219	8,499,800
Earnings per common share - Basic	$ 0.10	$ 0.07	$ 0.17	$ 0.13
Earnings per common share - Diluted
Net income attributable to OBCI	$ 903,093	$ 621,665	$ 1,537,324	$ 1,143,333
Weighted average number of common shares outstanding	8,914,274	8,605,183	8,808,219	8,499,800
Dilutive effect of employee stock-based awards	86,900	234,061	114,372	270,358
Weighted average number of common shares outstanding - assuming dilution	9,001,174	8,839,244	8,922,591	8,770,158
Earnings per common share - Diluted	$ 0.10	$ 0.07	$ 0.17	$ 0.13