Securities - Aggregate Amortized Cost and Market Values of the Investment Securities Portfolio by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]
Due one year or less, Amortized Cost	$ 5,805,769
Due after one year through five years, Amortized Cost	14,945,406
Due after five years through ten years, Amortized Cost	16,772,341
Due after ten years, Amortized Cost	3,613,891
Amortized Cost	41,137,407	36,277,498
Due one year or less, Fair Value	5,808,257
Due after one year through five years, Fair Value	14,889,307
Due after five years through ten years, Fair Value	15,963,447
Due after ten years, Fair Value	3,293,779
Fair Value	$ 39,954,790	$ 36,700,520	[1]

[1] Derived from the audited consolidated financial statements.