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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - Subordinated Notes - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Nov. 26, 2019
Debt Instrument [Line Items]    
Principal amount of debt issued   $ 40,000
Fixed interest rate   4.625%
Debt issuance costs $ 700  
SOFR    
Debt Instrument [Line Items]    
Interest rate margin 3.27%