Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
loan
Sep. 30, 2013
loan
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 5,171,003,000 $ 3,002,246,000 $ 3,039,368,000
Loans and interest accruing 90 days past due 16,118,000   6,746,000
Average investment in impaired loans 157,709,000   128,479,000
Interest income recorded on impaired loans 4,590,000   4,321,000
Nonaccrual loans 20,279,000   15,035,000
Period for restructured loan to be considered default 90 days    
Recorded Investment 136,009,000   112,621,000
Loans considered to be trouble debt restructurings 28,971,000   41,824,000
Nonaccrual loans excluded from impaired loan disclosure 0   0
Restructured loans that defaulted in the current period 24,000 43,000  
Number of restructured loans that defaulted in current period 1 1  
Acquired Loan Portfolio [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,900,000,000   377,800,000
Remaining discount on acquired loans $ 25,100,000   $ 3,300,000