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, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits $ 104,192 $ 107,804 $ 70,369
Professional services $ 6,309 5,594 3,419
Total   20,345 2,132
StellarOne Bank [Member]      
Business Combination, Separately Recognized Transactions [Line Items]      
Salaries and employee benefits   7,875  
Professional services   3,736 2,132
Other costs of operations   8,734  
Total   $ 20,345 $ 2,132