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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Performance Indicators for Nonperforming Assets (Details) | Mar. 31, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.66% | 0.68%
Nonperforming assets as a percentage of total assets | 0.50% | 0.52%
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.18% | 0.17%
Nonperforming assets as a percentage of total assets | 0.13% | 0.13%
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonperforming loans and leases as a percentage of total loans and leases | 0.48% | 0.51%
Nonperforming assets as a percentage of total assets | 0.37% | 0.39%

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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 Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans. + References No definition available. + Details
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