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)
9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
loan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 5,543,621,000 $ 5,171,003,000 $ 5,345,996,000
Period for restructured loan to be considered default 90 days    
Loans considered to be trouble debt restructurings $ 11,555,000   26,777,000
Purchased Impaired (net of credit mark) 78,606,000 $ 119,743,000 105,788,000
Number of restructured loans that defaulted in current period | loan   1  
Restructured loans that defaulted in the current period   $ 24,000  
Provision for unfunded commitments 300,000    
purchased impaired loans (gross) 95,700,000   126,300,000
Acquired Performing Loan Portfolio [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,500,000,000   1,800,000,000
Remaining discount on acquired loans $ 21,900,000   $ 24,300,000