Quarterly report pursuant to Section 13 or 15(d)

INTANGIBLE ASSETS (Narrative) (Details)

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INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Apr. 01, 2018
Jan. 01, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]              
Goodwill $ 725,195   $ 725,195       $ 298,528
Goodwill, written off related to sale of business unit 864            
Intangible assets, amortization expense 3,215 $ 1,544 6,396 $ 3,180      
Xenith              
Finite-Lived Intangible Assets [Line Items]              
Acquired amortizable intangible assets           $ 38,470  
Goodwill           $ 424,148  
Dixon, Hubard, Feinour, & Brown              
Finite-Lived Intangible Assets [Line Items]              
Acquired amortizable intangible assets         $ 4,300    
Goodwill         $ 3,400    
Core Deposits and Other Intangible Assets              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, amortization expense $ 3,200 $ 1,500 $ 6,400 $ 3,200      
Core Deposits and Other Intangible Assets | Minimum              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, amortization period     4 years        
Core Deposits and Other Intangible Assets | Maximum              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, amortization period     14 years        
Other amortizable intangibles | Minimum              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, amortization period     5 years        
Other amortizable intangibles | Maximum              
Finite-Lived Intangible Assets [Line Items]              
Intangible assets, amortization period     15 years