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SECURITIES - Available-for-sale Debt Securities by Contractual Maturity (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale Securities
Due in one year or less, amortized cost	$ 15,531,000
Due in one year or less, fair value	15,641,000
Due from one year through five years. amortized cost	51,151,000
Due from one year through five years, fair value	52,150,000
Due from five years through ten years, amortized cost	65,651,000
Due from five years through ten years, fair value	67,498,000
Due after ten years, amortized cost	121,478,000
Due after ten years, fair value	123,828,000
Sub-total, amortized cost	253,811,000
Sub-total, fair value	259,117,000
Total, amortized cost	429,883,000	$ 334,552,000
Total, fair value	437,857,000	349,332,000
Investment Securities
Available-for-sale Securities
Investment pledged as collateral	254,062,000	247,373,000
Residential Passthrough Securities
Available-for-sale Securities
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost	59,920,000
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value	60,629,000
Total, amortized cost	59,920,000	36,853,000
Total, fair value	60,629,000	38,176,000
Residential Collateralized Mortgage Obligations
Available-for-sale Securities
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost	43,811,000
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value	44,593,000
Total, amortized cost	43,811,000	56,048,000
Total, fair value	44,593,000	$ 57,467,000
Commercial mortgage-backed securities
Available-for-sale Securities
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost	72,341,000
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value	$ 73,518,000

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