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Stock Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 | $ 0 |  |
Shares, granted (in shares) | 0 | 0 |  |
Compensation expense restricted stock awards | $ 549,000 | $ 592,000 |  |
Fair value of shares vesting during period | $ 1,101,000 | 1,227,000 |  |
Performance Based Restricted Stock Awards | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares, granted (in shares) | 18,100 |  | 16,681 | 15,657
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vested (in shares) | 26,262 |  |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 1,562,000 |  | $ 1,026,000 |
Income tax benefit related to share based compensation | $ 115,000 | $ 124,000 |  |
Vested, shares (in shares) | 23,658 |  |  |
Weighted average grant (in dollars per share) | $ 29.56 |  |  |
Restricted Stock Units (RSUs) | Vested Immediately |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation expense restricted stock awards | $ 340,000 |  |  |
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) | 11,502 |  |  |
Weighted average grant (in dollars per share) | $ 29.56 |  |  |

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