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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans $ 28,232 $ 26,953 $ 21,700
Nonaccrual interest lost $ 1,800 2,300 $ 698
Period for restructured loan to be considered default 90 days    
Acquired performing loan portfolio $ 12,610,936 9,716,207  
Acquired Performing Loan Portfolio      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio 3,000,000 2,000,000  
Remaining discount on acquired loans 50,100 30,300  
Purchased Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Acquired performing loan portfolio 86,681 90,221  
Purchased impaired loans (gross) $ 104,900 $ 113,500