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Condensed Parent Company Only Financial Statements - Condensed Statements of Operations (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, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating income                      
Interest income $ 10,767,000 $ 11,226,000 $ 10,852,000 $ 10,875,000 $ 11,507,000 $ 12,120,000 $ 11,230,000 $ 11,265,000 $ 43,720,509 $ 46,122,127 $ 38,435,192
Gain on sale of investment                 428,200 221,781 (170,788)
Operating expenses                      
Income before income tax expense 2,626,000 3,727,000 1,864,000 2,813,000 3,441,000 4,558,000 2,665,000 3,131,000 11,030,060 13,794,801 7,755,192
Income tax expense 919,000 1,244,000 621,000 952,000 1,116,000 1,506,000 912,000 1,071,000 3,736,138 4,604,930 2,635,411
Net Income 1,707,000 2,483,000 1,243,000 1,861,000 2,325,000 3,052,000 1,753,000 2,060,000 7,293,922 9,189,871 5,119,781
Parent Company [Member]
                      
Operating income                      
Interest income                 44,000 160,000 397,000
Gain on sale of investment                 241,000 163,000  
Dividend from subsidiary                     18,000,000
Total operating income                 285,000 323,000 18,397,000
Operating expenses                      
Other expenses                 155,000 163,000 203,000
Total operating expenses                 155,000 163,000 203,000
Income before income tax expense                 130,000 160,000 18,194,000
Income tax expense                 52,000 63,000 76,000
Income before equity in undistributed earnings of subsidiary                 78,000 97,000 18,118,000
Increase (decrease) in equity in undistributed earnings of subsidiary                 7,216,000 9,093,000 (12,998,000)
Net Income                 $ 7,294,000 $ 9,190,000 $ 5,120,000