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REGULATORY CAPITAL - Additional Information (Details) - Conservation Buffer [Member] | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017 | Jan. 01, 2016
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Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |
Increase in capital conservation buffer |  | 0.625% | 0.625% | 0.625%
Minimum [Member] |  |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |  |
Minimum amount of capital for adequacy purposes, ratio | 2.50% |  |  |

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