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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Debentures (Details) - Junior Subordinated Debt - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Amount of Subordinated Debentures $ 51,547 $ 72,166
Trust IV    
Debt Instrument [Line Items]    
Amount of Subordinated Debentures 30,928 30,928
Trust V    
Debt Instrument [Line Items]    
Amount of Subordinated Debentures $ 20,619 20,619
Trust II    
Debt Instrument [Line Items]    
Amount of Subordinated Debentures   $ 20,619