Net Earnings per Common Share - Reconciliation of Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Earnings Per Share Reconciliation [Abstract] | ||||
| Net earnings available to common shareholders | $ 2,256 | $ 1,138 | $ 4,177 | $ 2,181 |
| Weighted average common shares outstanding | 9,438,541 | 5,739,173 | 8,574,900 | 5,748,154 |
| Dilutive effect of stock options | 54,014 | 11,938 | 44,096 | 10,908 |
| Dilutive effect of directors' shares | 5,353 | 5,305 | ||
| Dilutive effect of performance share awards | 71,787 | 42,333 | 63,685 | 42,172 |
| Diluted common shares | 9,569,695 | 5,793,444 | 8,687,986 | 5,801,234 |
| Basic earnings per common share | $ 0.24 | $ 0.20 | $ 0.49 | $ 0.38 |
| Diluted earnings per common share | $ 0.24 | $ 0.20 | $ 0.48 | $ 0.38 |