Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

v3.5.0.2
BORROWINGS (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2014
USD ($)
Aug. 23, 2012
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
acquisition
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Subordinated Borrowing [Line Items]              
Remaining available balance for the federal funds lines     $ 169,000   $ 169,000   $ 175,000
Remaining available balance of alternate line of credit     9,000   9,000   25,000
Maximum collateral dependent line of credit with the FHLB     2,400,000   2,400,000   1,500,000
Prepayment penalty   $ 19,600          
Prepayment penalty amortization expense     474 $ 463 1,404 $ 1,400  
Carrying value of the loans and securities pledged as collateral for FHLB     2,000,000   2,000,000   $ 1,900,000
Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance         $ 90,500    
Acquisitions, Prior To 2006              
Subordinated Borrowing [Line Items]              
Number of bank acquisitions | acquisition         2    
Trust preferred capital notes principal balance         $ 58,500    
StellarOne              
Subordinated Borrowing [Line Items]              
Long-term FHLB borrowings $ 70,000   45,000   45,000    
Remaining fair value premium on acquired FHLB advances     693   693    
StellarOne | Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance $ 32,000            
Remaining fair value discount on acquired notes     $ 6,800   $ 6,800