Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Contribution of intangible asset $ 14,000  
Total other intangible assets, gross carrying amount 532,258 $ 142,105
Total other intangible assets, accumulated amortization (103,484) (87,127)
Total other intangible assets, net of carrying value 428,774 54,978
Core deposit intangible    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, gross carrying amount 336,508 26,758
Total other intangible assets, accumulated amortization (18,340) (11,306)
Total other intangible assets, net of carrying value 318,168 15,452
Customer relationship    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, gross carrying amount 194,956 114,553
Total other intangible assets, accumulated amortization (84,412) (75,115)
Total other intangible assets, net of carrying value 110,544 39,438
Other    
Finite-Lived Intangible Assets [Line Items]    
Total other intangible assets, gross carrying amount 794 794
Total other intangible assets, accumulated amortization (732) (706)
Total other intangible assets, net of carrying value $ 62 $ 88