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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Performance Indicators for Nonperforming Assets (Details) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.59% | 0.66%
Nonperforming assets as a percentage of total assets | 0.45% | 0.50%
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.21% | 0.17%
Nonperforming assets as a percentage of total assets | 0.15% | 0.13%
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.38% | 0.49%
Nonperforming assets as a percentage of total assets | 0.30% | 0.37%

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- Definition Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total assets. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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