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DERIVATIVES - Additional Information (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
N
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
N
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Derivative [Line Items]                      
Net interest income $ 30,914,000 $ 30,085,000 $ 29,268,000 $ 30,007,000 $ 29,385,000 $ 28,142,000 $ 29,243,000 $ 28,393,000 $ 120,274,000 $ 115,163,000 $ 111,141,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]                      
Derivative [Line Items]                      
Notional amount $ 245,000,000       $ 230,000,000       245,000,000 230,000,000  
Net interest income                 953,000 390,000  
Unrealized after-tax gain of accumulated other comprehensive income (loss)     $ 189,000         $ 220,000      
Interest income                 $ 223,000 $ 124,000  
Derivative number of instruments terminated | N     4         2