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Summary of Consolidated Unaudited 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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                              
Interest income $ 4,004,000 $ 3,940,000 $ 3,708,000 $ 3,630,000 $ 3,828,000 $ 4,005,000 $ 3,928,000 $ 4,056,000 $ 4,174,000 $ 4,349,000 $ 4,323,000 $ 4,286,000 $ 15,281,865 $ 15,817,230 $ 17,131,965
Interest expense 571,000 675,000 699,000 717,000 767,000 810,000 830,000 848,000 902,000 915,000 927,000 939,000 2,661,805 3,255,096 3,682,580
Net interest income 3,433,000 3,265,000 3,009,000 2,913,000 3,061,000 3,195,000 3,098,000 3,208,000 3,272,000 3,434,000 3,396,000 3,347,000 12,620,060 12,562,134 13,449,385
Provision for credit losses 260,000       100,000 150,000     288,000 150,000   225,000 260,000 250,000 663,000
Net securities gains 71,000 150,000 122,000 2,000 45,000 62,000 33,000 23,000 63,000 85,000 73,000 188,000 345,331 162,594 408,646
Income before income taxes 814,000 1,039,000 788,000 607,000 761,000 833,000 805,000 940,000 831,000 1,009,000 998,000 922,000 3,248,032 3,338,887 3,760,503
Net income $ 650,000 $ 795,000 $ 640,000 $ 529,000 $ 609,000 $ 670,000 $ 656,000 $ 730,000 $ 756,000 $ 770,000 $ 758,000 $ 709,000 $ 2,614,177 $ 2,665,080 $ 2,993,093
Net income per share (basic and diluted) (in dollars per share) $ 0.23 $ 0.29 $ 0.24 $ 0.19 $ 0.23 $ 0.24 $ 0.24 $ 0.27 $ 0.28 $ 0.28 $ 0.28 $ 0.26 $ 0.95 $ 0.98 $ 1.10