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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2019
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  |  | 241,076 | 230,752 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 98,073 | 98,401 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  | 37,513 | 92,748 |
Total |  |  |  | 135,586 | 191,149 |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 105,490 | 39,603 |
July 1, 2022 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  |  | 85,350 |  |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 20,210 |  |
Total |  |  |  | 20,210 |  |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 65,140 |  |
August 3, 2021 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  |  | 80,700 | 80,700 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 40,350 | 23,375 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  | 17,722 |
Total |  |  |  | 40,350 | 41,097 |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 40,350 | 39,603 |
August 3, 2020 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  |  | 75,026 | 75,026 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 37,513 | 37,513 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  | 37,513 | 37,513 |
Total |  |  |  | 75,026 | 75,026 |
July 1, 2019 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of underlying shares |  |  |  |  | 75,026 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  | 37,513 |
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  | 37,513 |
Total |  |  |  |  | 75,026 |
Restricted stock units |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares awarded |  | 85,350 | 80,700 | 85,350 | 80,700 |
Number of shares vested |  |  |  | 64,488 | 73,750 |
Number of shares forfeited |  |  |  | 10,538 |  |
Restricted stock units | July 1, 2019 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares vested | 64,488 |  |  |  |  |
Number of shares forfeited | 10,538 |  |  |  |  |
Restricted stock units | Awards granted in 2018 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  |  |  |  | 2,500
Restricted stock units | Awards granted in 2019 |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |
Number of shares forfeited |  |  |  |  |  | 2,750

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