Quarterly report pursuant to Section 13 or 15(d)

INTANGIBLE ASSETS (Narrative) (Details)

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INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
 3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Goodwill   $ 724,106,000     $ 298,528,000
Impairment charges     $ 0    
Intangible assets, amortization expense   3,181,000   $ 1,637,000  
Xenith          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period 10 years        
Acquired amortizable intangible assets $ 38,470,000        
Goodwill $ 425,577,000        
Core Deposits and Other Intangible Assets          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense   $ 3,200,000   $ 1,600,000  
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   10 years