Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Remaining available balance for the federal funds lines $ 173,400,000   $ 93,500,000
Securities pledged as collateral for FHLB advances 1,400,000,000   805,200,000
Prepayment penalty 19,600,000    
Prepayment penalty amortization expense 436,000 426,000  
Collateral dependent line of credit with the FHLB 1,500,000,000   1,100,000,000
Acquisitions, Prior To 2006 [Member]
      
Trust preferred capital notes principal balance 58,500,000    
Remaining fair value discount on subordinated debt 1,000,000    
Subordinated debt interest rate basis LIBOR plus 1.45%    
Subordinated debt maturity date Apr. 01, 2016    
Subordinated debt 17,500,000    
LIBOR [Member]
      
Three-month LIBOR rate plus 1.50%    
LIBOR [Member] | Acquisitions, Prior To 2006 [Member]
      
Three-month LIBOR rate plus 1.45%    
StellarOne Bank [Member]
      
Trust preferred capital notes principal balance 32,000,000    
Remaining fair value discount on acquired trust preferred capital notes 7,400,000    
Loans from Other Federal Home Loan Banks 70,000,000    
Remaining fair value discount on acquired FHLB advances $ 2,900,000