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REGULATORY CAPITAL REQUIREMENTS - Narratives (Details) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Regulatory capital requirements |  |
Capital conversion buffer - 2016 | 0.625% |
Increase in capital conversion buffer each year ( as a percent) | 0.625% |
Capital conservation buffer - 2019 | 2.50% |
Actual, Ratio (as a percent) | 7.00% |
Actual, Ratio (as a percent) | 8.50% |
Actual, Ratio (as a percent) | 10.50% |
Basel III |  |
Regulatory capital requirements |  |
Additional capital conservation buffer (as a percentage) | 2.50% |
Actual, Ratio (as a percent) | 10.20% | 10.40%
Actual, Ratio (as a percent) | 10.20% | 10.40%
Actual, Ratio (as a percent) | 13.10% | 13.60%

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