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Stock Compensation - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of nonqualified options or restricted stock for key employees and independent directors (up to) (in shares) | 500,000 |  | 500,000 |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 |  | $ 0 |  |
Shares, granted (in shares) |  |  | 0 | 0.00 |
Compensation expense restricted stock awards | $ 277,000 | $ 207,000 | $ 951,000 | $ 396,000 |
Vested (in shares) | 300 |  | 40,405 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 1,311,000 |  | $ 1,311,000 |  |
Fair value of shares vesting during period | 9,000 | $ 6,000 | $ 1,471,000 | $ 923,000 |
Restricted Stock Units (RSUs) | Vested Immediately |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vested (in shares) |  |  | 15,600 |  |
Compensation expense | $ 0 |  | $ 385,000 |  |
Performance Based Restricted Stock Awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares, granted (in shares) |  |  | 15,702 |  | 10,000
Independent Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 33.00% |  |
Award vesting period |  |  | 3 years |  |
Starting period of vesting of stock based award |  |  | 1 year |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |
Key Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 25.00% |  |
Award vesting period |  |  | 4 years |  |
Starting period of vesting of stock based award |  |  | 1 year |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |

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