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FAIR VALUE MEASUREMENTS - Fair value measurement on non-recurring basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans $ 7,979 $ 5,941    
Foreclosed real estate 3,561 3,533 $ 1,468 $ 1,088
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 7,979 5,941    
Foreclosed real estate 3,561 3,533    
Total 11,540 9,474    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impaired loans 7,979 5,941    
Foreclosed real estate 3,561 3,533    
Total $ 11,540 $ 9,474