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LOANS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans $ 77,866     $ 75,124
Loans modified that are not troubled debt restructurings 71,300 $ 26,900    
Real estate, equipment and receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collateral-dependent Loans 70,000      
Minimum | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans 100 100   100
Troubled debt restructuring loans 100 100   100
Loans Excluding Purchased Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Troubled debt restructuring 36,200     35,200
Troubled debt restructurings, previous charge-offs, excluding purchased loans 2,000   $ 1,900  
Allowance for loan losses allocated to troubled debt restructuring 2,700     $ 3,700
Troubled debt restructurings principal balances 976 2,934    
Financing receivable, modifications, subsequent default, recorded investment 3,000 $ 1,700    
COVID-19 Pandemic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans modified that are not troubled debt restructurings $ 147,800