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
Mar. 31, 2016
USD ($)
reserve
securitization
component
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases receivable net premium $ 272,000,000 $ 262,000,000    
Allowance for loan and lease losses $ 613,719,000 597,843,000 $ 605,126,000 $ 605,196,000
Number of days past due 30 days      
Allowance number of reserves | reserve 2      
Allowance number of components of reserve | component 2      
Collateral for secured borrowings $ 18,000,000,000      
Macquarie Equipment Finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collateral for secured borrowings $ 128,000,000      
Number of securitizations acquired | securitization 2      
Commercial Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 102,074,000 100,007,000 100,752,000 102,839,000
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      
Other Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 24,302,000 24,269,000 17,016,000 38,272,000
Threshold period past due for nonperforming status 120 days      
Threshold period past due for write-off 120 days      
Commercial and Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 320,367,000 298,746,000 284,573,000 286,995,000
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      
Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 40,842,000 41,646,000 55,380,000 47,211,000
Threshold period past due for nonperforming status 150 days      
Threshold period past due for write-off 150 days      
Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 78,102,000 83,671,000 110,280,000 96,413,000
Automobile        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 48,032,000 $ 49,504,000 $ 37,125,000 $ 33,466,000
Threshold period past due for nonperforming status 120 days      
Threshold period past due for write-off 120 days      
Secured by first-lien | Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Threshold period past due for nonperforming status 150 days      
Threshold period past due for write-off 150 days      
Secured by junior-lien | Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Threshold period past due for nonperforming status 120 days      
Threshold period past due for write-off 120 days