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)
3 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
loan
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
loan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 5,233,069,000 $ 5,510,385,000 $ 5,233,069,000 $ 5,345,996,000
Period for restructured loan to be considered default   90 days    
Loans considered to be trouble debt restructurings   $ 22,124,000   26,777,000
Purchased Impaired (net of credit mark) $ 131,107,000 87,841,000 $ 131,107,000 105,788,000
Number of restructured loans that defaulted in current period | loan 1   1  
Restructured loans that defaulted in the current period $ 24,000   $ 24,000  
Provision for unfunded commitments   200,000    
purchased impaired loans (gross)   107,100,000   126,300,000
Acquired Performing Loan Portfolio [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans   1,600,000,000   1,800,000,000
Remaining discount on acquired loans   $ 23,000,000   $ 24,300,000