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Investment Securities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 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 $ 2,919,958  
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 $ 11,193 210,652 (29,901) $ 433,000
Other Comprehensive Income Realized Gain on Investment Securities, tax $ 0 $ (59,758) 222,025 (108,998)  
Available-for-sale Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities unrealized gains (losses)     $ 546,000 (78,000)  
Investment securities unrealized loss       246,000  
Investment securities unrealized gain       168,000  
Preferred Stock [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Proceeds from Sale of Investment Securities       $ 2,900,000