Share Based Compensation Plans - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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May 31, 2011
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
Shares reserved to be issued | 381,920 | ||||
Shares to be issued under the Plan | 223,788 | ||||
Expense on Restricted stock awards | $ 57,933 | $ 4,346 | $ 66,625 | $ 13,037 | |
Unrecognized compensation expense | 2,093,779 | 2,093,779 | |||
Shares to be issued under employee stock purchase plan | 164,306 | 164,306 | |||
Shares purchased by employees | 3,668 | 15,434 | 6,707 | 21,609 | |
Weighted average price | $ 15.56 | $ 12.47 | $ 14.88 | $ 11.52 | |
Compensation expense recognized | $ 4,000 | $ 77,000 | $ 12,000 | $ 112,000 | |
Employee Stock [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
Shares reserved to be issued | 167,674 | 167,674 | |||
Employee stock purchase limit, percentage of annual salary | 10.00% | 10.00% |