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 ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Period for restructured loan to be considered default 90 days    
Provision for unfunded commitments $ 100 $ 200  
Total loans held for investment, net 5,941,098 5,510,385 $ 5,671,462
Acquired Performing Loan Portfolio [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for investment, net 1,200,000   1,400,000
Remaining discount on acquired loans 19,100   20,800
Purchased Impaired [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans held for investment, net 67,170 $ 87,841 73,737
Purchased impaired loans (gross) $ 83,100   $ 90,300