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Quarterly Results of Operations (Unaudited) - Summary (Details) (USD $)
 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
May 02, 2012
Feb. 19, 2013
Dec. 11, 2012
Nov. 09, 2012
Aug. 08, 2012
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, 2013
Mar. 31, 2012
Mar. 31, 2011
Quarterly Financial Data [Abstract]                                
Total revenue           $ 20,372,438 $ 20,604,861 $ 20,705,421 $ 20,427,726 $ 20,419,586 $ 20,219,413 $ 20,262,360 $ 19,613,691 $ 82,110,446 $ 80,515,050 $ 73,715,079
Interest expense           1,403,441 1,275,015 1,250,231 1,192,140 1,189,117 1,236,866 1,236,893 1,228,978 5,120,827 4,891,854 5,599,951
Provision for credit losses           3,542,077 3,484,811 3,261,721 3,103,266 2,600,949 3,507,659 3,209,524 3,049,461 13,391,875 12,367,593 15,611,544
Non-interest expense           7,593,445 8,370,168 7,804,873 7,343,103 6,877,637 6,755,283 6,779,122 6,695,286      
Operating income before income taxes           7,833,475 7,474,867 8,388,596 8,789,217 9,751,883 8,719,605 9,036,821 8,639,966 32,486,155 36,148,275 27,287,034
Income tax expense           3,046,179 2,878,811 3,238,458 3,381,761 3,749,890 3,340,762 3,504,456 3,331,408 12,545,209 13,926,516 10,518,740
Net income           $ 4,787,296 $ 4,596,056 $ 5,150,138 $ 5,407,456 $ 6,001,993 $ 5,378,843 $ 5,532,365 $ 5,308,558 $ 19,940,946 $ 22,221,759 $ 16,768,294
Earnings per share:                                
Basic (in dollars per share)           $ 0.40 $ 0.38 $ 0.43 $ 0.45 $ 0.51 $ 0.46 $ 0.47 $ 0.46 $ 1.66 $ 1.89 $ 1.44
Diluted (in dollars per share)           $ 0.39 $ 0.38 $ 0.42 $ 0.44 $ 0.50 $ 0.45 $ 0.46 $ 0.44 $ 1.63 $ 1.85 $ 1.41
Dividends declared per share (in dollars per share) $ 0.10 $ 0.12 $ 2.00 $ 0.12 $ 0.12 $ 0.12 $ 2.12 $ 0.12 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.00 $ 2.46 $ 0.30 $ 0.00