Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Remaining available balance for the federal funds lines $ 175,000,000   $ 175,000,000   $ 150,000,000
Maximum collateral dependent line of credit with the FHLB 1,500,000,000   1,500,000,000   1,400,000,000
Prepayment penalty     19,600,000    
Prepayment penalty amortization expense 455,000 $ 444,000 902,000 $ 881,000  
Carrying value of the loans and securities pledged as collateral for FHLB 1,800,000,000   $ 1,800,000,000   $ 1,200,000,000
Acquisitions, Prior To 2006 [Member]          
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   $ 17,500,000    
LIBOR [Member] | Acquisitions, Prior To 2006 [Member]          
Spread on 3-Month LIBOR     1.45%    
StellarOne Bank [Member]          
Trust preferred capital notes principal balance     $ 32,000,000    
Loans from Other Federal Home Loan Banks 70,000,000   70,000,000    
Trust Preferred Capital Notes [Member]          
Trust preferred capital notes principal balance     90,500,000    
Trust Preferred Capital Notes [Member] | StellarOne Bank [Member]          
Remaining fair value discount on acquired notes 7,100,000   7,100,000    
Subordinated Debt [Member] | Acquisitions, Prior To 2006 [Member]          
Remaining fair value discount on acquired notes 408,000   408,000    
Federal Home Loan Bank Advances [Member] | StellarOne Bank [Member]          
Remaining fair value premium on acquired FHLB advances $ 1,600,000   $ 1,600,000