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Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity (Detail) (USD $)
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost $ 40,735,300
Fair Value 39,543,075
Corporate Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Corporate bonds 5 to 10 years, Amortized cost 9,000,000
Corporate bonds 5 to 10 years, Fair value 8,610,093
U. S. Government Agency Bonds [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Corporate bonds 5 to 10 years, Amortized cost 7,500,000
Corporate bonds 5 to 10 years, Fair value 7,188,603
U. S. Government Agency Mortgage-Backed Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
U.S. Government agency mortgage - backed securities, Amortized cost 24,235,300
U.S. Government agency mortgage - backed securities, Fair value $ 23,744,379