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 9 Months Ended
Sep. 30, 2016
USD ($)
reserve
component
Sep. 30, 2016
USD ($)
reserve
securitization
note
component
Aug. 16, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans and leases receivable net premium $ 74,000,000 $ 74,000,000     $ 262,000,000      
Loans held for Investment, Fair Value 89,190,000 89,190,000 $ 56,000,000   34,637,000      
Allowance for loan and lease losses $ 616,898,000 $ 616,898,000   $ 623,064,000 597,843,000 $ 591,938,000 $ 599,542,000 $ 605,196,000
Number of days past due   30 days            
Allowance number of reserves | reserve 2 2            
Allowance number of components of reserve | component 2 2            
Collateral for secured borrowings $ 19,200,000,000 $ 19,200,000,000            
Number of new notes potentially created in NAL restructuring | note   2            
Macquarie Equipment Finance                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Collateral for secured borrowings 87,000,000 $ 87,000,000            
Number of securitizations acquired | securitization   2            
FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     15,475,915,000          
Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan and lease losses $ 431,795,000 $ 431,795,000   424,507,000 398,753,000 394,296,000 377,101,000 389,834,000
Threshold period past due for nonperforming status 90 days 90 days            
Threshold outstanding balance for quarterly impairment evaluation   $ 1,000,000.0            
Threshold period past due for write-off   90 days            
Threshold Period of Consecutive Payments to Remove from Nonaccrual Status   6 months            
Commercial | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     9,096,842,000          
Commercial | Commercial and Industrial | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     7,252,692,000          
Commercial | Commercial Real Estate | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     1,844,150,000          
Consumer                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for loan and lease losses $ 185,103,000 $ 185,103,000   $ 198,557,000 $ 199,090,000 $ 197,642,000 $ 222,441,000 $ 215,362,000
Threshold period past due for nonperforming status   120 days            
Threshold period past due for write-off   120 days            
Consumer | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     6,379,073,000          
Consumer | Automobile                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Threshold period past due for nonperforming status 120 days              
Consumer | Automobile | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     1,609,145,000          
Consumer | Home Equity | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     1,537,791,000          
Consumer | Residential Mortgage                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Threshold period past due for nonperforming status 150 days 150 days            
Threshold period past due for write-off   150 days            
Consumer | Residential Mortgage | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     1,092,050,000          
Consumer | RV and Marine FInance | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     1,816,575,000          
Consumer | Other Consumer | FirstMerit Corporation                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans and leases     $ 323,512,000          
Secured by first-lien | Consumer | 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 | Consumer | 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