Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 1,992,849 $ 676,869 $ 522,541
Contribution of intangible asset $ 14,000      
Total other intangible assets, gross carrying amount   519,725 541,316  
Total other intangible assets, accumulated amortization   (117,267) (486,338)  
Total other intangible assets, net of carrying value   402,458 54,978  
Goodwill, Other Increase (Decrease)   (4,838) (1,500)  
Core deposit intangible        
Finite-Lived Intangible Assets [Line Items]        
Total other intangible assets, gross carrying amount   324,619 400,058  
Total other intangible assets, accumulated amortization   (26,778) (384,606)  
Total other intangible assets, net of carrying value   297,841 15,452  
Customer relationship        
Finite-Lived Intangible Assets [Line Items]        
Total other intangible assets, gross carrying amount   194,956 116,094  
Total other intangible assets, accumulated amortization   (90,383) (76,656)  
Total other intangible assets, net of carrying value   104,573 39,438  
Other        
Finite-Lived Intangible Assets [Line Items]        
Total other intangible assets, gross carrying amount   150 25,164  
Total other intangible assets, accumulated amortization   (106) (25,076)  
Total other intangible assets, net of carrying value   $ 44 $ 88