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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($)
3 Months Ended
Jun. 25, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
DERIVATIVE FINANCIAL INSTRUMENTS        
Cash pledged   $ 1,630,000 $ 710,000  
Securities pledged   10,618,000 $ 8,713,000  
Interest rate swap | Cash flow hedge | Variable-rate borrowings        
DERIVATIVE FINANCIAL INSTRUMENTS        
Notional amount       $ 10,000,000
Amount received $ 174,000      
Unrealized gain   $ 29,000