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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Performance Indicators for Nonperforming Assets (Details) | Jun. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total nonperforming loans and leases as a percentage of total loans and leases | 0.75% | 0.79%
Total nonperforming assets as a percentage of total assets | 0.56% | 0.60%
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total nonperforming loans and leases as a percentage of total loans and leases | 0.25% | 0.24%
Total nonperforming assets as a percentage of total assets | 0.18% | 0.17%
Retail |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total nonperforming loans and leases as a percentage of total loans and leases | 0.50% | 0.55%
Total nonperforming assets as a percentage of total assets | 0.38% | 0.43%

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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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- 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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