Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)

v3.5.0.2
GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)
$ in Thousands
 9 Months Ended
Aug. 16, 2016
USD ($)
Sep. 30, 2016
USD ($)
segments
Dec. 31, 2015
USD ($)
Business Combinations [Abstract]      
Number of major business segments | segments   5  
Business Acquisition [Line Items]      
Goodwill   $ 2,004,348 $ 676,869
Other intangible assets   428,774 54,978
Goodwill transfers   4,838  
FirstMerit Corporation      
Business Acquisition [Line Items]      
Business combination consideration transferred $ 3,700,000    
Goodwill 1,332,317 1,300,000  
Core deposit intangible      
Business Acquisition [Line Items]      
Other intangible assets   318,168 15,452
Core deposit intangible | FirstMerit Corporation      
Business Acquisition [Line Items]      
Intangible assets 309,750    
Other      
Business Acquisition [Line Items]      
Other intangible assets   62 88
Other | FirstMerit Corporation      
Business Acquisition [Line Items]      
Intangible assets $ 94,571    
Treasury/ Other      
Business Acquisition [Line Items]      
Goodwill   0 $ 4,838
Goodwill transfers   $ 4,838