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, 2017
USD ($)
reserve
component
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases receivable net premium $ 179,000,000 $ 120,000,000    
Loans held for investment 98,342,000 82,319,000    
Allowance for loan and lease losses $ 672,580,000 638,413,000 $ 613,719,000 $ 597,843,000
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 $ 29,300,000,000      
Macquarie Equipment Finance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collateral for secured borrowings 55,000,000      
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 480,308,000 451,091,000 422,441,000 398,753,000
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      
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan and lease losses $ 192,272,000 $ 187,322,000 $ 191,278,000 $ 199,090,000
Threshold period past due for nonperforming status 120 days      
Threshold period past due for write-off 120 days      
Consumer | Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Threshold period past due for write-off 150 days      
Secured by first-lien | Consumer | Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Threshold period past due for write-off 150 days      
Secured by junior-lien | Consumer | Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Threshold period past due for write-off 120 days