FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK AND CONCENTRATIONS OF CREDIT RISK - Additional Information (Details) - Credit Concentration Risk [Member] - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loans Receivable, Secure by Commercial and Residential Real Estate	$ 598,634,000
Loans Receivable, Percentage of Loans Secure by Commercial and Residential Real Estate	85.00%
Concentration Risk, Percentage	10.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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