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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Debentures (Details) - Junior Subordinated Debt - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Subordinated Debentures $ 51,547 $ 51,547
Trust IV    
Debt Instrument [Line Items]    
Subordinated Debentures 30,928 30,928
Trust V    
Debt Instrument [Line Items]    
Subordinated Debentures $ 20,619 $ 20,619