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Stock Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 | $ 0 | $ 0 | $ 0 |  |
Shares, granted (in shares) | 0 | 0 |  |  |  |
Shares vested (in shares) | 639 |  | 38,310 |  |  |
Compensation expense restricted stock awards | $ 242,000 | $ 269,000 | $ 1,109,000 | 1,218,000 |  |
Vested, shares (in shares) |  |  | 25,940 |  |  |
Weighted average grant (in dollars per share) |  |  | $ 25.27 |  |  |
Fair value of shares vesting during period | $ 18,000 | 8,000 | $ 1,346,000 | 1,479,000 |  |
Performance Based Restricted Stock Awards | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares, granted (in shares) |  |  | 16,681 |  | 15,657 | 7,109
2019 PBRSA |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares vested (in shares) | 241 |  |  |  |  |
2018 PBRSA |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares vested (in shares) | 557 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 640,000 |  | $ 640,000 |  | $ 775,000 |
Income tax benefit related to share based compensation | 51,000 | $ 56,000 | 233,000 | $ 256,000 |  |
Restricted Stock Units (RSUs) | Vested Immediately |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense restricted stock awards | $ 0 |  | $ 350,000 |  |  |
Key Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Starting period of vesting of stock based award |  |  | 1 year |  |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |  |
Key Employees | Vesting in year two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 25.00% |  |  |
Key Employees | Vesting in year three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 20.00% |  |  |
Independent Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Starting period of vesting of stock based award |  |  | 1 year |  |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |  |
Independent Directors | Vesting in year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 33.33% |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested, shares (in shares) |  |  | 13,850 |  |  |
Weighted average grant (in dollars per share) |  |  | $ 25.27 |  |  |

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