Premises and Equipment - Premises and Equipment are Stated at Cost, Less Accumulated Depreciation (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	$ 14,663,671	$ 14,138,133
Less accumulated depreciation	7,725,784	7,638,477
Premises and equipment, net	6,937,887	6,499,656
Land [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	1,983,849	1,974,527
Land Improvements [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	359,729	493,195
Original Useful Life Years	15 years
Leasehold Improvements [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	1,083,051	1,083,051
Original Useful Life Years	15 years
Buildings [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	6,040,517	5,440,002
Original Useful Life Years	39 years
Furniture, Fixtures & Equipment [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Total	$ 5,196,525	$ 5,147,358
Furniture, Fixtures & Equipment [Member] | Minimum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Original Useful Life Years	3 years
Furniture, Fixtures & Equipment [Member] | Maximum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Original Useful Life Years	7 years