INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value of Investments with Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available for sale:
Less Than 12 Months, Fair Value	$ 190	$ 2,142
12 Months or Greater, Fair value	1,558	215
Total, Fair Value	1,748	2,357
Less Than 12 Months, Unrealized Losses	0	20
12 Months or Greater, Unrealized Losses	29	3
Total, Unrealized Losses	29	23
Held to maturity:
Less Than 12 Months, Fair Value	8,562
12 Months or Greater, Fair value	0
Total, Fair Value	8,562
Less Than 12 Months, Unrealized Losses	132
12 Months or Greater, Unrealized Losses	0
Total, Unrealized Losses	132
Residential mortgage-backed securities
Available for sale:
Less Than 12 Months, Fair Value	190	2,142
12 Months or Greater, Fair value	1,558	215
Total, Fair Value	1,748	2,357
Less Than 12 Months, Unrealized Losses	0	20
12 Months or Greater, Unrealized Losses	29	3
Total, Unrealized Losses	29	$ 23
Held to maturity:
Less Than 12 Months, Fair Value	6,130
12 Months or Greater, Fair value	0
Total, Fair Value	6,130
Less Than 12 Months, Unrealized Losses	85
12 Months or Greater, Unrealized Losses	0
Total, Unrealized Losses	85
States and political subdivisions
Held to maturity:
Less Than 12 Months, Fair Value	2,432
12 Months or Greater, Fair value	0
Total, Fair Value	2,432
Less Than 12 Months, Unrealized Losses	47
12 Months or Greater, Unrealized Losses	0
Total, Unrealized Losses	$ 47