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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Actual and Required Capital Ratios (Details) | Sep. 30, 2021 | Dec. 31, 2020 | Jan. 01, 2019
--- | --- | --- | ---
Actual |  |  |
Total capital to risk-weighted assets, ratio | 14.12 | 13.57 |
Common equity tier 1 capital to risk-weighted assets, ratio | 10.92 | 10.49 |
Tier 1 capital to risk-weighted assets, ratio | 11.70 | 11.29 |
Tier 1 capital to average assets, ratio | 8.54 | 8.12 |
Capital Required For Capital Adequacy [Abstract] |  |  |
Regulatory minimum to be well capitalized, Total capital to risk-weighted assets, ratio | 10.50 | 10.50 |
Regulatory minimum to be well capitalized, Common equity tier 1 capital to risk-weighted assets, ratio | 7.00% | 7.00% |
Regulatory minimum to be well capitalized, Tier 1 capital to risk-weighted assets, ratio | 8.50 | 8.50 |
Regulatory minimum to be well capitalized, Tier 1 capital to average assets, ratio | 5.00 | 5.00 |
Bank |  |  |
Actual |  |  |
Total capital to risk-weighted assets, ratio | 13.92 | 13.27 |
Common equity tier 1 capital to risk-weighted assets, ratio | 13.02 | 12.53 |
Tier 1 capital to risk-weighted assets, ratio | 13.02 | 12.52 |
Tier 1 capital to average assets, ratio | 9.50 | 9.02 |
Capital Required For Capital Adequacy [Abstract] |  |  |
Regulatory minimum to be well capitalized, Total capital to risk-weighted assets, ratio | 10.50 | 10.50 |
Regulatory minimum to be well capitalized, Common equity tier 1 capital to risk-weighted assets, ratio | 7.00% | 7.00% | 7.00%
Regulatory minimum to be well capitalized, Tier 1 capital to risk-weighted assets, ratio | 8.50 | 8.50 | 8.5
Regulatory minimum to be well capitalized, Tier 1 capital to average assets, ratio | 5.00 | 5.00 | 10.5

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