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, 2019
Dec. 31, 2018
Financing Receivable, Modifications [Line Items]    
Period for restructured loan to be considered default 90 days  
Total loans held for investment, net $ 11,952,310 $ 9,716,207
Acquired Performing Loan Portfolio    
Financing Receivable, Modifications [Line Items]    
Total loans held for investment, net 3,900,000 2,000,000
Remaining discount on acquired loans 63,500 30,300
Purchased Impaired    
Financing Receivable, Modifications [Line Items]    
Total loans held for investment, net 99,932 90,221
Purchased impaired loans (gross) $ 125,000 $ 113,500