Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Summary of Acquisition-Related Expenses) (Details)

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ACQUISITIONS (Summary of Acquisition-Related Expenses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits $ 117,103 $ 104,192 $ 107,804
Professional services 8,085 6,309 5,594
Total $ 0 $ 0 20,345
StellarOne Bank      
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits     7,875
Professional services     3,736
Other costs of operations     8,734
Total     $ 20,345