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Condensed Income Statement (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
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ (11,113,244) | $ (10,795,319) | $ (11,115,412)
Income before income tax benefit and equity in undistributed net income of subsidiaries | 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
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 633,855 | 673,807 | 767,410
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
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and distributions from subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 980,000 | 980,000 | 920,000
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | (76,005) | (65,446) | (58,172)
Income before income tax benefit and equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 903,995 | 914,554 | 861,828
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 27,970 | 24,084 | 21,120
Change in undistributed equity of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 1,682,212 | 1,726,441 | 2,110,145
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,614,177 | $ 2,665,080 | $ 2,993,093

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