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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 25, 2019
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DERIVATIVE FINANCIAL INSTRUMENTS          
Cash pledged   $ 710      
Securities pledged   8,713   $ 589  
Interest rate swap | Variable-rate borrowings          
DERIVATIVE FINANCIAL INSTRUMENTS          
Notional amount   138,356   112,947  
Interest rate swap | Cash flow hedge | Variable-rate borrowings          
DERIVATIVE FINANCIAL INSTRUMENTS          
Notional amount   17,000 $ 10,000 10,000 $ 10,000
Amount received $ 174        
Unrealized gain   52      
Offsetting interest rate swap contracts          
DERIVATIVE FINANCIAL INSTRUMENTS          
Notional amount   $ 138,356   $ 112,947