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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]      
Period for restructured loan to be considered default 90 days    
Provision for loan losses $ (9,103) $ (7,360)  
Total loans held for investment, net 9,411,598   $ 7,141,552
Acquired Performing Loan Portfolio      
Financing Receivable, Modifications [Line Items]      
Total loans held for investment, net 2,200,000   892,400
Remaining discount on acquired loans 33,400   13,700
Purchased Impaired      
Financing Receivable, Modifications [Line Items]      
Total loans held for investment, net 94,746   39,021
Purchased impaired loans (gross) $ 119,100   $ 47,900