Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)
3 Months Ended
Sep. 30, 2018
USD ($)
reserve
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total ALLL balance $ 761,000,000 $ 741,000,000 $ 691,000,000 $ 675,000,000 $ 668,000,000 $ 638,000,000
Loans and leases receivable net premium $ 408,000,000   334,000,000      
Number of days past due 30 days          
Allowance number of reserves | reserve 2          
Collateral for secured borrowings $ 44,100,000,000   31,700,000,000      
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total ALLL balance $ 543,000,000 531,000,000 482,000,000 474,000,000 475,000,000 451,000,000
Threshold period past due for nonperforming status 90 days          
Threshold period past due for write-off 90 days          
Threshold outstanding balance for quarterly impairment evaluation $ 1,000,000.0          
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total ALLL balance $ 218,000,000 $ 210,000,000 $ 209,000,000 $ 201,000,000 $ 193,000,000 $ 187,000,000
Threshold period past due for write-off 120 days