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Summary of Significant Accounting Policies - Reconciliation of Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Earnings Per Share Reconciliation [Abstract] | |||
| Net earnings available to common shareholders | $ 5,403 | $ 4,006 | $ 2,057 |
| Weighted average common shares outstanding | 5,888,862 | 5,730,114 | 5,730,114 |
| Dilutive effect of stock options | 19,266 | 6,511 | 3,276 |
| Dilutive effect of performance share awards | 52,071 | 27,660 | 7,010 |
| Diluted common shares | 5,960,199 | 5,764,285 | 5,740,400 |
| Basic earnings per common share | $ 0.92 | $ 0.70 | $ 0.36 |
| Diluted earnings per common share | $ 0.91 | $ 0.69 | $ 0.36 |