Annual report pursuant to Section 13 and 15(d)

ACQUISITION OF FIRSTMERIT CORPORATION - Assets Acquired and Liabilities Assumed (Details)

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ACQUISITION OF FIRSTMERIT CORPORATION - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Aug. 16, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets acquired:        
Bank owned life insurance $ 633,612      
Goodwill   $ 1,992,849 $ 676,869 $ 522,541
Servicing rights 15,317      
FirstMerit Bank        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 15,745,467      
Assets acquired:        
Cash and due from banks 703,661      
Interest-bearing deposits in banks 32,496      
Business Combination, Acquired Receivables, Fair Value 15,475,915      
Loans held for sale 150,576      
Available for sale and other securities 7,369,967      
Premises and equipment 228,635      
Goodwill 1,320,818 $ 1,300,000    
Accrued income and other assets 506,578      
Total assets acquired 26,841,896      
Liabilities assumed:        
Deposits 21,157,172      
Short-Term Debt 1,163,851      
Long-term Debt 519,971      
Accrued Liabilities and Other Liabilities 292,930      
Total liabilities assumed 23,133,924      
Total consideration paid 3,707,972      
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 2,800,000      
Payments to acquired business in cash 836,879      
FirstMerit Bank | Common Stock        
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 2,766,773      
FirstMerit Bank | Preferred Stock        
Business Combination, Consideration Transferred [Abstract]        
Consideration transferred, equity interest issued and issuable 104,320      
FirstMerit Bank | Core deposit intangible        
Assets acquired:        
Intangible assets 309,750      
FirstMerit Bank | Other        
Assets acquired:        
Intangible assets 94,571      
FirstMerit Bank | Commercial        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 9,309,378      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 9,096,842      
FirstMerit Bank | Commercial | Commercial and Industrial        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 7,410,503      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 7,252,692      
FirstMerit Bank | Commercial | Commercial Real Estate        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 1,898,875      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 1,844,150      
FirstMerit Bank | Consumer        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 6,436,089      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 6,379,073      
FirstMerit Bank | Consumer | Automobile        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 1,610,007      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 1,609,145      
FirstMerit Bank | Consumer | Home Equity        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 1,579,832      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 1,537,791      
FirstMerit Bank | Consumer | Residential Mortgage        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 1,098,588      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 1,092,050      
FirstMerit Bank | Consumer | RV and marine finance        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 1,823,312      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value 1,816,575      
FirstMerit Bank | Consumer | Other Consumer        
Business Combination, Acquired Receivables [Abstract]        
Business Combination, Acquired Receivables, Gross Contractual Amount 324,350      
Assets acquired:        
Business Combination, Acquired Receivables, Fair Value $ 323,512