Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

v3.6.0.2
BORROWINGS (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
acquisition
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 01, 2014
USD ($)
Subordinated Borrowing [Line Items]        
Remaining available balance for the federal funds lines $ 175,000 $ 175,000    
Remaining borrowing capacity with correspondent banks 25,000 25,000    
Maximum collateral dependent line of credit with the FHLB 2,400,000 1,500,000    
Subordinated debt 150,000      
Prepayment penalty 19,600      
Prepayment penalty amortization expense 1,900 1,800 $ 1,800  
Carrying value of the loans and securities pledged as collateral for FHLB 2,000,000 $ 1,900,000    
Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Trust preferred capital notes principal balance $ 90,500      
Subordinated Debt Notes        
Subordinated Borrowing [Line Items]        
Three-month LIBOR rate plus 5.00%      
Acquisitions, Prior To 2006        
Subordinated Borrowing [Line Items]        
Number of bank acquisitions | acquisition 2      
Trust preferred capital notes principal balance $ 58,500      
Subordinated debt maturity date Dec. 15, 2026      
Acquisitions, Prior To 2006 | Subordinated Debt Notes        
Subordinated Borrowing [Line Items]        
Remaining fair value discount on acquired notes $ 2,000      
LIBOR | Subordinated Debt Notes        
Subordinated Borrowing [Line Items]        
Three-month LIBOR rate plus 3.175%      
StellarOne Bank        
Subordinated Borrowing [Line Items]        
Trust preferred capital notes principal balance $ 32,000      
Loans from Other Federal Home Loan Banks 20,000     $ 70,000
Remaining fair value premium on acquired FHLB advances 559      
StellarOne Bank | Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Remaining fair value discount on acquired notes $ 6,700