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LOANS - Summary of Information Pertaining to Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans $ 75,124   $ 77,866
Total impaired loans 104,733 $ 72,785  
Impaired Loans Excluding Purchased Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 75,124 41,879  
Troubled debt restructurings not included above 29,609 30,906  
Total impaired loans 104,733 72,785  
Interest income recognized on impaired loans 1,201 854  
Foregone interest income on impaired loans $ 1,044 $ 729