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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]          
Purchased of common stock and debt securities     $ 6,927,254    
Investment securities unrealized gains (losses)       $ 128,000  
Other Comprehensive Income Unrealized Gain on Investment Securities, tax $ (185,294) $ 22,185 $ (41,094) $ 49,430  
Minimum [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Debt instrument maturity     5 years    
Maximum [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Debt instrument maturity     10 years    
Available-for-sale Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities unrealized gains (losses)     $ (106,000)    
Other Comprehensive Income Unrealized Gain on Investment Securities, tax     (41,000)    
Investment securities unrealized loss     120,000    
Investment securities unrealized gain     14,000    
Preferred Stock [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Purchased of common stock and debt securities         $ 730,000
Common Stock [Member] | Debt Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Purchased of common stock and debt securities     $ 6,900,000