Fair Value Measurements - Summary of Quantitative Fair Value Measurements for Level 3 (Detail) (Discounted Appraised Value [Member], Significant Unobservable Inputs (Level 3) [Member], USD $)	6 Months Ended
	Jun. 30, 2013
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 2,939,932
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure	$ 3,351,454
Minimum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	10.00%
Unobservable Input, Lack of Marketability	0.00%
Minimum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	6.00%
Unobservable Input, Lack of Marketability	10.00%
Maximum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	20.00%
Unobservable Input, Lack of Marketability	100.00%
Maximum [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	13.00%
Unobservable Input, Lack of Marketability	30.00%
Weighted Average [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	(11.00%)
Unobservable Input, Lack of Marketability	(32.00%)
Weighted Average [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Unobservable Input, Selling Cost	(6.00%)
Unobservable Input, Lack of Marketability	(19.00%)