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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]      
Period for restructured loan to be considered default 90 days    
Provision for unfunded commitments $ 112 $ 100  
Total loans held for investment, net 6,554,046 5,780,502 $ 6,307,060
Acquired Performing Loan Portfolio      
Financing Receivable, Modifications [Line Items]      
Total loans held for investment, net 1,000,000   1,100,000
Remaining discount on acquired loans 16,100   16,900
Purchased Impaired      
Financing Receivable, Modifications [Line Items]      
Total loans held for investment, net 57,770 $ 70,105 59,292
Purchased impaired loans (gross) $ 71,500   $ 73,600