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Stock Based Compensation (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2017
Restricted stock and RSU grants: |  |  |  |  |  |  |  |  |  |
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) |  |  | $ 25.65 |  | $ 24.60 |  | $ 25.65 | $ 24.60 |  |
Value of stock vested during the year (based on grant price) |  |  | $ 585,000 |  |  |  | $ 3,589,000 | $ 2,304,000 |  |
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) |  |  | $ 24.03 |  |  |  | $ 24.03 |  |  |
Restricted stock and RSU grants |  |  |  |  |  |  |  |  |  |
Total charge to operations: |  |  |  |  |  |  |  |  |  |
Total charge to operations |  |  | $ 1,329,000 |  | $ 938,000 |  | $ 2,305,000 | $ 1,892,000 |  |
Restricted stock |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 5 years |  |  |
Number of shares vested |  |  |  |  |  |  | 122,125 | 112,150 |  |
Summary of the activity of the incentive plans |  |  |  |  |  |  |  |  |  |
Average per share grant price (in dollars per share) |  |  |  |  |  |  | $ 28.10 | $ 25.70 |  |
Deferred compensation to be recognized over vesting period |  |  | $ 4,202,000 |  | $ 3,856,000 |  | $ 4,202,000 | $ 3,856,000 |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 701,675 | 701,675 | 689,150 | 689,150 |  | 674,250 | 651,250 | 651,250 |
Number of shares awarded |  |  |  |  |  |  | 149,550 | 150,050 |  |
Non-vested end of period (in shares) |  |  | 701,675 |  | 689,150 |  | 701,675 | 689,150 | 674,250 |
Vested during year (in shares) |  |  |  |  |  |  | (122,125) | (112,150) |  |
Total charge to operations: |  |  |  |  |  |  |  |  |  |
Total charge to operations |  |  | $ 884,000 |  | $ 843,000 |  | $ 1,759,000 | $ 1,686,000 |  |
Total compensation costs related to non-vested awards that have not yet been recognized |  |  | $ 9,583,000 |  |  |  | $ 9,583,000 |  |  |
Weighted average remaining vesting period |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |
RSUs |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Number of shares forfeited |  |  | 51,907 |  |  |  | 51,907 |  | 5,250 |
Number of shares vested |  |  | 24,343 |  |  |  | 24,343 |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 148,776 | 225,026 | 152,500 | 152,500 |  | 225,026 | 152,500 | 152,500 |
Number of shares awarded |  | 75,026 |  | 77,776 |  | 76,250 |  |  |  |
Forfeitures (in shares) |  |  | (51,907) |  |  |  | (51,907) |  | (5,250) |
Non-vested end of period (in shares) |  |  | 148,776 |  | 152,500 |  | 148,776 | 152,500 | 225,026 |
Vested during year (in shares) |  |  | (24,343) |  |  |  | (24,343) |  |  |
Total charge to operations: |  |  |  |  |  |  |  |  |  |
Total charge to operations |  |  | $ 445,000 |  | $ 95,000 |  | $ 546,000 | $ 206,000 |  |
Total compensation costs related to non-vested awards that have not yet been recognized |  |  | $ 963,000 |  |  |  | $ 963,000 |  |  |
Weighted average remaining vesting period |  |  |  |  |  |  | 1 year 6 months |  |  |
RSUs | Awards granted in 2018 and 2019 |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Number of shares forfeited |  |  |  |  |  |  | 0 |  |  |
Number of shares vested |  |  |  |  |  |  | 0 |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Forfeitures (in shares) |  |  |  |  |  |  | 0 |  |  |
Vested during year (in shares) |  |  |  |  |  |  | 0 |  |  |
TSR Awards |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  |  |  |  |  | 50.00% |  |  |
ROC Awards |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Percentage of RSUs to vest upon achievement of specified criteria |  |  |  |  |  |  | 50.00% |  |  |
2019 Incentive Plan |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for issuance |  |  | 750,000 |  |  |  | 750,000 |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  |  | 224,576 |  |  |
2019 Incentive Plan | Restricted stock |  |  |  |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  |  | 149,550 |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  |  | 75,026 |  |  |
2016 and 2012 Incentive Plans |  |  |  |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 625,875 |  |  |  |  |  |  |  |
Non-vested end of period (in shares) |  |  | 625,875 |  |  |  | 625,875 |  |  |
2016 and 2012 Incentive Plans | Restricted stock |  |  |  |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 552,125 |  |  |  |  |  |  |  |
Non-vested end of period (in shares) |  |  | 552,125 |  |  |  | 552,125 |  |  |
2016 and 2012 Incentive Plans | RSUs |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Number of shares forfeited | 51,907 |  |  |  |  |  |  |  |  |
Number of shares vested | 24,343 |  |  |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 73,750 |  |  |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  |  |  |  |  | 76,250
Forfeitures (in shares) | (51,907) |  |  |  |  |  |  |  |  |
Non-vested end of period (in shares) |  |  | 73,750 |  |  |  | 73,750 |  |  |
Vested during year (in shares) | (24,343) |  |  |  |  |  |  |  |  |
Pay-for-performance program | RSUs | Awards granted in 2018 |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Aggregate fair value of the shares granted |  |  | $ 918,000 |  |  |  | $ 918,000 |  |  |
Pay-for-performance program | RSUs | Awards granted in 2019 |  |  |  |  |  |  |  |  |  |
Stock Based Compensation |  |  |  |  |  |  |  |  |  |
Aggregate fair value of the shares granted |  |  | $ 986,000 |  |  |  | $ 986,000 |  |  |

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