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Stock - Based Compensation - Narrative (Details) |  |  |  |  |  |  |  | 12 Months Ended |  |
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May 16, 2019 USD ($) shares | Feb. 06, 2019 $ / shares shares | May 17, 2018 USD ($) shares | Feb. 07, 2018 $ / shares shares | May 18, 2017 USD ($) shares | Feb. 08, 2017 employees $ / shares shares | May 05, 2016 employees | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | May 17, 2019 shares | Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  |  |  | 500,000 |  |  |  |
Options available (in shares) | shares |  |  |  |  |  |  |  | 215,823 |  |  |  |
Compensation expense |  |  |  |  |  |  |  | $ 2,100,000 | $ 800,000 | $ 600,000 |  |
(Benefit from) provision for income taxes |  |  |  |  |  |  |  | $ 400,000 | $ 200,000 | $ 200,000 |  |
Exercised (in shares) | shares |  |  |  |  |  |  |  | 3,628 | 85,440 | 25,632 |  |
Options exercisable (in shares) | shares |  |  |  |  |  |  |  | 51,745 |  |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 14.13 |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 2,091,000 | $ 827,000 | $ 638,000 |  |
Issuance of shares of common stock from the treasury (in shares) | shares |  |  |  |  |  |  |  | 162,869 | 66,632 | 58,532 |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options available (in shares) | shares |  |  |  |  |  |  |  | 155,845 | 155,845 | 154,870 |  | 152,965
Exercised (in shares) | shares |  |  |  |  |  |  |  | 3,628 | 85,440 |  |  |
Option exercises, aggregate exercise price |  |  |  |  |  |  |  | $ 45,734 | $ 1,000,000 |  |  |
Options exercisable (in shares) | shares |  |  |  |  |  |  |  | 51,745 | 49,127 | 119,861 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 14.13 | $ 13.82 | $ 12.45 |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 31,186 | $ 46,529 | $ 80,966 |  |
Total unrecognized compensation cost |  |  |  |  |  |  |  | $ 2,261 |  |  |  |
Share-based compensation, weighted average period of recognition |  |  |  |  |  |  |  | 1 month 11 days |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options, vested in period, fair value |  |  |  |  |  |  |  | $ 400,000 | $ 0 | 0 |  |
Granted (in shares) | shares |  |  |  |  |  |  |  | 35,887 |  |  |  |
Granted, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 15.72 |  |  |
Vesting period |  |  |  |  |  |  |  | 3 years |  |  |  |
Nonvested award, option, cost not yet recognized, amount |  |  |  |  |  |  |  | $ 200,000 |  |  |  |
Nonvested award, cost not yet recognized, period for recognition |  |  |  |  |  |  |  | 1 year 4 months 10 days |  |  |  |
2011 Plan | Stock Options | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% |  |  |  |
2011 Plan | Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 33.00% |  |  |  |
2005 Stock Awards Plan | Stock Options | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 33.00% |  |  |  |
2005 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 1,400,000 | $ 800,000 | $ 600,000 |  |
Total unrecognized compensation cost |  |  |  |  |  |  |  | $ 800,000 |  |  |  |
Share-based compensation, weighted average period of recognition |  |  |  |  |  |  |  | 2 years 1 month 10 days |  |  |  |
2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares | 250,000 |  |  |  |  |  |  | 250,000 |  |  | 500,000 |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% |  |  |  |
Expiration period for awards |  |  |  |  |  |  |  | 10 years |  |  |  |
Period after grant date, awards vesting begins |  |  |  |  |  |  |  | 1 year | 1 year |  |  |
Granted (in shares) | shares |  | 44,949 |  | 65,527 |  | 44,687 |  |  |  |  |  |
Granted, weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 15.72 |  | $ 12.47 |  | $ 12.30 |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years | 5 years |  |  |  |  |
Number of employees receiving grants | employees |  |  |  |  |  | 8 | 5 |  |  |  |  |
2015 Stock Awards Plan | Stock Awards | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |
2015 Stock Awards Plan | Stock Awards | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Annual vesting rate |  |  |  |  |  |  |  | 33.00% | 33.00% |  |  |
Non Employee Director |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock from the treasury (in shares) | shares | 15,909 |  | 14,857 |  | 24,209 |  |  |  |  |  |  |
Annual Cash Retainer Fees | $ 304,000 |  | $ 276,000 |  | $ 287,500 |  |  |  |  |  |  |
Restricted Stock | Non Employee Director |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum annual retainer percent |  |  |  |  |  |  |  | 100.00% |  |  |  |
May 5, 2016 | 2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 75,756 |  |  |  |
February 8, 2017 | 2015 Stock Awards Plan | Stock Awards |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  | $ 67,180 |  |  |  |

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