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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]          
Investment sold     $ 6,800,000    
Proceeds from Sale of Investment Securities     6,252,362 $ 834,964  
Net realized gain loss on investments     (576,000)    
Investment Securities $ 0   0   $ 5,703,767
Investment securities unrealized gains (losses)     (576,000)   (1,100,000)
Other Comprehensive Income Unrealized Gain (Loss) on Available-for-Sale Investment Securities, tax $ 0 $ (185,294) 210,652 (41,094) $ 433,000
Other Comprehensive Income Realized Gain on Investment Securities, tax     222,025 (49,240)  
Available-for-sale Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities unrealized gains (losses)     $ 546,000 (106,000)  
Investment securities unrealized loss       120,000  
Investment securities unrealized gain       14,000  
Preferred Stock [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment sold       704,000  
Proceeds from Sale of Investment Securities       835,000  
Net realized gain loss on investments       $ 131,000