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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