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EARNINGS PER COMMON SHARE - Shares of common stock underlying RSUs (Details) - shares |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 | Aug. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Earnings Per Common Share |  |  |  |  |  |  |  |
Number of underlying shares |  |  |  |  | 241,076 | 230,752 | 241,076 | 230,752
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  | 120,519 | 115,376 | 120,519 | 115,376
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  | 37,494 | 64,488 | 37,494 | 64,488
Total |  |  |  |  | 158,013 | 179,864 | 158,013 | 179,864
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  |  | 83,063 | 50,888 | 83,063 | 50,888
July 1, 2022 |  |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |  |
Number of underlying shares |  |  |  |  | 85,350 |  | 85,350 |
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  | 42,675 |  | 42,675 |
Total |  |  |  |  | 42,675 |  | 42,675 |
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  |  | 42,675 |  | 42,675 |
August 3, 2021 |  |  |  |  |  |  |  |
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 |  |  |  |  | 40,350 | 40,350 | 40,350 | 40,350
Total |  |  |  |  | 40,350 | 40,350 | 40,350 | 40,350
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  |  | 40,350 | 40,350 | 40,350 | 40,350
August 3, 2020 |  |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |  |
Number of underlying shares |  |  |  |  | 75,026 | 75,026 | 75,026 | 75,026
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric |  |  |  |  | 37,494 | 37,513 | 37,494 | 37,513
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric |  |  |  |  | 37,494 | 37,513 | 37,494 | 37,513
Total |  |  |  |  | 74,988 | 75,026 | 74,988 | 75,026
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  |  | 38 |  | 38 |
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 |  |  |  |  |  | 26,975 |  | 26,975
Total |  |  |  |  |  | 64,488 |  | 64,488
Common shares not included in calculation due applicable metric had not been met at measurement dates |  |  |  |  |  | 10,538 |  | 10,538
Restricted stock units |  |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |  |
Number of shares vested | 74,988 |  |  |  | 74,988 | 64,488 | 74,988 | 64,488
Number of shares forfeited | 38 |  |  |  | 38 | 10,538 | 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 |  |  |  |  |  |
Restricted stock units | July 1, 2019 |  |  |  |  |  |  |  |
Earnings Per Common Share |  |  |  |  |  |  |  |
Number of shares vested |  |  | 64,488 |  |  |  |  |
Number of shares forfeited |  |  |  | 10,538 |  |  |  |

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