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Employee Benefit Plans - Additional Information (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 shares | May 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized | 40,000,000 | 40,000,000 |  |  |
Treasury stock, shares | 1,259,551 | 1,318,545 |  |  |
Number of active plans | plan | 2 |  |  |  |
Share-based compensation expense | $ | $ 2,612 | $ 2,245 | $ 2,402 |  |
Stock shares repurchased (in shares) | 27,214 | 74,132 | 40,870 |  |
Stock shares repurchased | $ | $ 2,324 | $ 4,663 | $ 1,518 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grants in period (in shares) | 42,136 | 47,514 | 100,892 |  |
Number of nonvested shares | 329,205 | 368,492 | 527,486 | 437,946 |
Options, vested in period, fair value | $ | $ 1,239 | $ 979 | $ 0 |  |
Unrecognized compensation costs, other than options | $ | $ 2,779 |  |  |  |
Period for recognition of unrecognized compensation cost | 1 year 9 months |  |  |  |
Short-term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred compensation plan, expenses in the year earned | $ | $ 1,176 |  |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ | $ 821 | 491 | 317 |  |
Award vesting period | 48 months |  |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 12 months |  |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 36 months |  |  |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares registered for employee purchase |  |  |  |  | 300,000
The 2014 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock authorized but not granted | 1,500,000 |  |  |  |
RSUs granted (in shares) | 321,131 |  |  |  |
The 2014 Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years |  |  |  |
The Director's Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock authorized but not granted | 300,000 |  |  |  |
Grants in period (in shares) | 69,900 |  |  |  |
The 2004 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 5 years |  |  |  |
Restricted stock authorized but not granted | 2,680,000 |  |  |  |
Weighted average remaining contractual term | 10 years |  |  |  |
The 2004 Plan | Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant | 0 |  |  |  |
Authorized shares remaining for issuance | 145,000 |  |  |  |
The 2004 Plan | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding (in shares) | 0 |  |  |  |
The 2004 Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of nonvested shares | 0 |  |  |  |
Number of shares available for grant | 0 |  |  |  |
Annual Cash Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Targeted bonus award expense | $ | $ 5,581 | $ 5,150 | $ 3,394 |  |

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