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Consolidated Quarterly Results of Operations (unaudited) - Summary of Consolidated Quarterly Results of Operations (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Total interest income $ 10,767,000 $ 11,226,000 $ 10,852,000 $ 10,875,000 $ 11,507,000 $ 12,120,000 $ 11,230,000 $ 11,265,000 $ 43,720,509 $ 46,122,127 $ 38,435,192
Total interest expense 733,000 823,000 922,000 1,025,000 1,135,000 1,204,000 1,262,000 1,313,000 3,502,908 4,913,869 5,217,170
Net interest income 10,034,000 10,403,000 9,930,000 9,850,000 10,372,000 10,916,000 9,968,000 9,952,000 40,217,601 41,208,258 33,218,022
Provision for loan losses 431,000 453,000 2,248,000 520,000 483,000 56,000 1,160,000 712,000 3,652,694 2,411,214 1,460,427
Net interest income after provision for loan losses 9,603,000 9,950,000 7,682,000 9,330,000 9,889,000 10,860,000 8,808,000 9,240,000 36,564,907 38,797,044 31,757,595
Noninterest income 1,797,000 1,780,000 2,276,000 1,816,000 1,868,000 2,160,000 1,970,000 1,763,000 7,669,849 7,760,815 6,999,972
Noninterest expense 8,774,000 8,003,000 8,094,000 8,333,000 8,316,000 8,462,000 8,113,000 7,872,000 33,204,696 32,763,058 31,002,375
Income before income taxes 2,626,000 3,727,000 1,864,000 2,813,000 3,441,000 4,558,000 2,665,000 3,131,000 11,030,060 13,794,801 7,755,192
Income tax expense 919,000 1,244,000 621,000 952,000 1,116,000 1,506,000 912,000 1,071,000 3,736,138 4,604,930 2,635,411
Net income $ 1,707,000 $ 2,483,000 $ 1,243,000 $ 1,861,000 $ 2,325,000 $ 3,052,000 $ 1,753,000 $ 2,060,000 $ 7,293,922 $ 9,189,871 $ 5,119,781
Earnings per share - basic $ 0.26 $ 0.38 $ 0.19 $ 0.28 $ 0.34 $ 0.44 $ 0.25 $ 0.30 $ 1.11 $ 1.33 $ 0.72
Earnings per share - diluted $ 0.25 $ 0.37 $ 0.18 $ 0.26 $ 0.33 $ 0.42 $ 0.24 $ 0.29 $ 1.06 $ 1.28 $ 0.71