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Summary of Consolidated Unaudited Quarterly Results of Operations (Detail) (USD $)
 3 Months Ended 12 Months Ended
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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Results Of Operations [Line Items]                              
Interest income $ 3,828,000 $ 4,005,000 $ 3,928,000 $ 4,056,000 $ 4,174,000 $ 4,349,000 $ 4,323,000 $ 4,286,000 $ 4,387,000 $ 4,608,000 $ 4,612,000 $ 4,572,000      
Interest expense 767,000 810,000 830,000 848,000 902,000 915,000 927,000 939,000 993,000 1,397,000 1,431,000 1,478,000 3,255,096 3,682,580 5,298,955
Net interest income 3,061,000 3,195,000 3,098,000 3,208,000 3,272,000 3,434,000 3,396,000 3,347,000 3,394,000 3,211,000 3,181,000 3,094,000 12,562,134 13,449,385 12,880,012
Provision for credit losses 100,000 150,000 0 0 288,000 150,000 0 225,000 0 300,000 450,000 300,000 250,000 663,000 1,050,000
Net securities gains 45,000 62,000 33,000 23,000 63,000 85,000 73,000 188,000 (1,000) 176,000 0 0 162,594 408,646 175,164
Income before income taxes 761,000 833,000 805,000 940,000 831,000 1,009,000 998,000 922,000 881,000 900,000 318,000 451,000 3,338,887 3,760,503 2,550,296
Net income $ 609,000 $ 670,000 $ 656,000 $ 730,000 $ 756,000 $ 770,000 $ 758,000 $ 709,000 $ 655,000 $ 689,000 $ 322,000 $ 399,000 $ 2,665,080 $ 2,993,093 $ 2,064,785
Net income per share (basic and diluted) $ 0.23 $ 0.24 $ 0.24 $ 0.27 $ 0.28 $ 0.28 $ 0.28 $ 0.26 $ 0.24 $ 0.25 $ 0.12 $ 0.15 $ 0.98 $ 1.10 $ 0.76