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Employee Benefit Plans - Non-vested Restricted Stock Activity (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2011
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Dec. 31, 2010
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| Compensation Related Costs [Abstract] | |||
| Non-vested restricted stock at beginning of year, Number of shares | 119,055 | 177,520 | 212,840 |
| Granted, Number of shares | 48,700 | ||
| Vested, Number of shares | (63,895) | ||
| Forfeited, Number of shares | (50) | ||
| Non-vested restricted stock at end of year, Number of shares | 103,810 | 177,520 | 212,840 |
| Non-vested restricted stock at beginning of year, Weighted average grant date fair value | $ 10.25 | ||
| Granted, Weighted average grant date fair value | $ 18.96 | ||
| Vested, Weighted average grant date fair value | $ 9.71 | ||
| Forfeited, Weighted average grant date fair value | $ 9.50 | ||
| Non-vested restricted stock at end of year, Weighted average grant date fair value | $ 14.68 |