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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

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