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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net Income	$ 9,178,122	$ 6,928,034	$ 18,690,744	$ 12,677,633
Weighted average shares outstanding
Basic (in shares)	3,287,751	3,198,231	3,253,144	3,182,175
Dilutive impact of restricted stock grants with forfeitable rights to dividends (in shares)	73,485	66,623	73,715	69,944
Dilutive impact of restricted stock units (in shares)	6,044	3,442	4,662	2,553
Diluted (in shares)	3,367,280	3,268,296	3,331,521	3,254,672
Earnings per share
Basic (USD per share)	$ 2.79	$ 2.17	$ 5.75	$ 3.98
Diluted (USD per share)	$ 2.73	$ 2.12	$ 5.61	$ 3.90

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