Quarterly report pursuant to Section 13 or 15(d)

ACQUISITION OF FIRSTMERIT CORPORATION - Narrative (Details)

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ACQUISITION OF FIRSTMERIT CORPORATION - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Aug. 16, 2016
USD ($)
$ / shares
shares
Jul. 26, 2016
Branch
Sep. 30, 2016
USD ($)
state
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
state
Sep. 30, 2015
USD ($)
Aug. 15, 2016
$ / shares
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                
Number of states in which entity operates | state     8   8      
Share price | $ / shares             $ 9.68  
Goodwill     $ 2,004,348   $ 2,004,348     $ 676,869
Net income     127,004 $ 152,588 472,858 $ 514,648    
Number of branches to be disposed | Branch   13            
Branches Sold In Connection with Acquisition of FirstMerit | Disposal Group, Held-for-sale, Not Discontinued Operations                
Business Acquisition [Line Items]                
Deposit liabilities held-for-sale     712,000   712,000      
Loans held-for-sale     112,000   112,000      
FirstMerit Bank                
Business Acquisition [Line Items]                
Business combination consideration transferred $ 3,700,000              
Equity interests issued and issuable per share (in shares) | shares 1.72              
Cash paid for each share of acquired entity's shares (in usd per sahre) | $ / shares $ 5.00              
Payments to acquired business in cash $ 836,879              
Consideration transferred, equity interest issued and issuable $ 2,800,000              
Equity interest issued or issuable, number of shares | shares 285,000,000              
Goodwill $ 1,332,317   1,300,000   1,300,000      
Goodwill expected to be tax deductible     339,000   339,000      
Goodwill expected tax deductible amount term 15 years              
FirstMerit Bank | Amortization of Premiums and Accretion of Discounts on Acquired Loans, Securities, Deposits, and Long-term Debt                
Business Acquisition [Line Items]                
Revenues     2,000   11,000      
FirstMerit Bank | Amortization of Premiums and Accretion of Discounts on Previously Acquired Loans, Securities, and Deposits                
Business Acquisition [Line Items]                
Revenues     (7,000)   (34,000)      
FirstMerit Bank | Amortization of Acquired Intangibles                
Business Acquisition [Line Items]                
Net income     (6,000)   (28,000)      
FirstMerit Bank | Acquisition-related Costs                
Business Acquisition [Line Items]                
Net income     $ 159,000   $ 186,000      
FirstMerit Bank | Common Stock                
Business Acquisition [Line Items]                
Consideration transferred, equity interest issued and issuable $ 2,766,898              
FirstMerit Bank | Preferred Stock                
Business Acquisition [Line Items]                
Consideration transferred, equity interest issued and issuable $ 104,320              
FirstMerit Bank | Core deposit intangible                
Business Acquisition [Line Items]                
Finite-lived intangible asset useful life         10 years