Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

v3.3.1.900
BORROWINGS (Narrative) (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jan. 01, 2014
USD ($)
Subordinated Borrowing [Line Items]        
Remaining available balance for the federal funds lines $ 175,000,000 $ 150,000,000    
Maximum collateral dependent line of credit with the FHLB 1,500,000,000 1,400,000    
Prepayment penalty 19,600,000      
Prepayment penalty amortization expense 1,800,000 1,800,000 $ 1,700,000  
Carrying value of the loans and securities pledged as collateral for FHLB 1,900,000,000 1,200,000,000    
Trust Preferred Capital Notes [Member]        
Subordinated Borrowing [Line Items]        
Trust preferred capital notes principal balance $ 90,500,000      
Acquisitions, Prior To 2006 [Member]        
Subordinated Borrowing [Line Items]        
Number of bank acquisitions | item 2      
Trust preferred capital notes principal balance $ 58,500,000      
Subordinated debt interest rate basis LIBOR plus 1.45%      
Subordinated debt maturity date Apr. 01, 2016      
Subordinated debt $ 17,500,000      
Acquisitions, Prior To 2006 [Member] | Subordinated Debt [Member]        
Subordinated Borrowing [Line Items]        
Remaining fair value discount on acquired notes $ 163,000      
LIBOR [Member] | Acquisitions, Prior To 2006 [Member]        
Subordinated Borrowing [Line Items]        
Three-month LIBOR rate plus 1.45%      
StellarOne Bank [Member]        
Subordinated Borrowing [Line Items]        
Trust preferred capital notes principal balance $ 32,000,000      
Remaining fair value premium on acquired FHLB advances 1,200,000      
Loans from Other Federal Home Loan Banks $ 60,000,000     $ 70,000,000
StellarOne Bank [Member] | Trust Preferred Capital Notes [Member]        
Subordinated Borrowing [Line Items]        
Remaining fair value discount on acquired notes   $ 7,000,000