Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Narrative) (Details)

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ACQUISITIONS (Narrative) (Details) - USD ($)
 12 Months Ended
Feb. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash paid in acquisition   $ 12,000 $ 14,304,000 $ 231,000
Merger-related costs   27,824,000 39,728,000 5,393,000
Goodwill   935,560,000 727,168,000  
Issuance of common stock in regard to acquisitions   499,974,000 794,809,000 $ 0
Access National Bank        
Business Acquisition [Line Items]        
Number of shares equivalent to each share of acquired entity 0.75      
Company's common shares issued 15,842,026      
Consideration transferred, fair value $ 499,974,000      
Cash paid in acquisition 12,000      
Merger-related costs   $ 26,200,000 $ 1,800,000  
Goodwill 208,376,000      
Minimum        
Business Acquisition [Line Items]        
Intangible assets, amortization period   4 years    
Maximum        
Business Acquisition [Line Items]        
Intangible assets, amortization period   10 years    
Performing | Access National Bank        
Business Acquisition [Line Items]        
Acquired performing loans, fair value 2,100,000,000      
Contractually required principal and interest payments 2,500,000,000      
Contractual cash flows not expected to be collected 17,900,000      
Nonperforming | Access National Bank        
Business Acquisition [Line Items]        
Fair value of loans acquired with a deterioration of credit quality 33,307,000      
Contractually required principal and interest payments $ 44,429,000