Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans $ 26,953 $ 21,743 $ 10,000
Nonaccrual interest lost $ 2,300 698 $ 452
Period for restructured loan to be considered default 90 days    
Acquired performing loan portfolio $ 9,716,207 7,141,552  
Acquired Performing Loan Portfolio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio 2,000,000 892,400  
Remaining discount on acquired loans 30,300 13,700  
Purchased Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio 90,221 39,021  
Purchased impaired loans (gross) $ 113,500 $ 47,900