Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - Recognized Identifiable Assets Acquired and Liabilities Assumed (Details)

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ACQUISITIONS - Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash paid for Xenith options   $ 6,170 $ 0  
Fair value of liabilities assumed:        
Goodwill   $ 724,106   $ 298,528
Xenith        
Business Acquisition [Line Items]        
Fair value of shares of Union common stock issued & warrants converted $ 794,809      
Cash paid for Xenith options 6,170      
Total purchase price 800,979      
Fair value of assets acquired:        
Cash and cash equivalents 174,218      
Securities available for sale 295,782      
Restricted stock, at cost 27,569      
Net loans 2,458,981      
Premises and equipment 45,520      
OREO 5,412      
Core deposit intangibles 38,470      
Other assets 203,468      
Total assets 3,249,420      
Fair value of liabilities assumed:        
Deposits 2,549,683      
Other short-term borrowings 235,000      
Borrowings 55,542      
Other liabilities 33,793      
Total liabilities 2,874,018      
Net assets acquired 375,402      
Goodwill $ 425,577