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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
--- | --- | --- | --- | ---
Jun. 30, 2023 | Aug. 31, 2023 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Earnings Per Common Share |  |  |  |  |  |  |
Number of underlying shares |  |  |  | 251,300 | 241,076 | 251,300 | 241,076
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 98,994 | 98,073 | 98,994 | 98,073
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  | 37,513 |  | 37,513
Total |  |  |  | 98,994 | 135,586 | 98,994 | 135,586
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 152,306 | 105,490 | 152,306 | 105,490
July 1, 2022 |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |
Number of underlying shares |  |  |  | 85,250 |  | 85,250 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 23,839 |  | 23,839 |
Total |  |  |  | 23,839 |  | 23,839 |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 61,411 |  | 61,411 |
August 3, 2021 |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |
Number of underlying shares |  |  |  | 85,350 | 85,350 | 85,350 | 85,350
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 35,344 | 20,210 | 35,344 | 20,210
Total |  |  |  | 35,344 | 20,210 | 35,344 | 20,210
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 50,006 | 65,140 | 50,006 | 65,140
August 3, 2020 |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |
Number of underlying shares |  |  |  | 80,700 | 80,700 | 80,700 | 80,700
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  | 39,811 | 40,350 | 39,811 | 40,350
Total |  |  |  | 39,811 | 40,350 | 39,811 | 40,350
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  | 40,889 | 40,350 | 40,889 | 40,350
July 1, 2019 |  |  |  |  |  |  |
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
Restricted stock units |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |
Number of shares vested | 74,988 |  |  |  |  | 74,988 | 64,488
Number of shares forfeited | 38 |  |  |  |  | 38 | 10,538
Restricted stock units | August 3, 2020 |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |
Number of shares vested |  |  | 74,988 |  |  |  |
Number of shares forfeited |  |  | 38 |  |  |  |
Number of shares issued upon vesting |  | 74,988 |  |  |  |  |

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