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)
 9 Months Ended
Sep. 30, 2017
USD ($)
reserve
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases receivable net premium $ 295,000,000   $ 120,000,000      
Consumer loans 99,191,000   82,319,000      
Allowance for loan and lease losses $ (675,486,000) $ (667,996,000) (638,413,000) $ (616,898,000) $ (623,064,000) $ (597,843,000)
Number of days past due 30 days          
Allowance number of reserves | reserve 2          
Collateral for secured borrowings $ 32,000,000,000          
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan and lease losses $ (474,122,000) (474,576,000) (451,091,000) (431,795,000) (424,507,000) (398,753,000)
Threshold period past due for nonperforming status 90 days          
Threshold outstanding balance for quarterly impairment evaluation $ 1,000,000.0          
Threshold period past due for write-off 90 days          
Commercial | Commercial and Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans $ 0   0      
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan and lease losses $ (201,364,000) $ (193,420,000) (187,322,000) $ (185,103,000) $ (198,557,000) $ (199,090,000)
Threshold period past due for write-off 120 days          
Consumer | Automobile            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans $ 1,178,000   2,154,000      
Consumer | Home Equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans 2,273,000   3,273,000      
Consumer | Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans 94,387,000   74,936,000      
Consumer | RV and Marine FInance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans 1,135,000   1,519,000      
Consumer | Other Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Consumer loans $ 218,000   $ 437,000