Securities - Aggregate amortized cost and market values of the investment securities portfolio by contractual maturity (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]
Due in one year or less, Amortized Cost	$ 4,007,574
Due after one year through five years, Amortized Cost	18,430,486
Due after five through ten years, Amortized Cost	13,291,387
Due after ten years, Amortized Cost	5,365,252
Amortized Cost	41,094,699	36,277,498
Due in one year or less, Fair Value	4,013,758
Due after one year through five years, Fair Value	18,415,158
Due after five through ten years, Fair Value	12,629,823
Due after ten years, Fair Value	4,991,674
Fair Value	$ 40,050,413	$ 36,700,520	[1]

[1] Derived from the audited consolidated financial statements.