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Condensed Income Statement (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
Interest expense on junior subordinated debentures | $ 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
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | 10,795,319 | 11,115,412 | 11,178,323
Income before income tax benefit and equity in undistributed net income of subsidiaries | 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
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 673,807 | 767,410 | 485,511
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
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and distributions from subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 980,000 | 920,000 | 1,455,000
Other income |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 24,645
Interest expense on junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (648,127)
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | (65,446) | (58,172) | (105,785)
Income before income tax benefit and equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 914,554 | 861,828 | 725,733
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  |  | 24,084 | 21,120 | 277,440
Change in undistributed equity of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 1,726,441 | 2,110,145 | 1,061,612
Net income |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,665,080 | $ 2,993,093 | $ 2,064,785

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