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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Allowance by Loan Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | $ 1,476,000 | $ 2,066,000 | $ 2,066,000
Charged off |  |  | (193,000) | (277,000) | (392,000)
Recoveries |  |  | 526,000 |  | 491,000
Provision for loan losses | $ (122,000) | $ (669,000) | (593,000) | (263,000) | 689,000
Balance, end of year | 2,790,000 |  | 2,790,000 |  | 1,476,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 10,000 |  | 10,000 |  | 11,000
Individually evaluated for impairment, Related loan balance | 2,161,000 |  | 2,161,000 |  | 4,664,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,780,000 |  | 2,780,000 |  | 1,465,000
Collectively evaluated for impairment, Related loan balance | 222,513,000 |  | 222,513,000 |  | 249,108,000
ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 1,574,000 |  |
Balance, end of year |  |  |  |  | 1,574,000
Real Estate Loan |  |  |  |  |
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 10,000 |  | 10,000 |  | 11,000
Construction And Land Development [Member] | Real Estate Loan |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 9,000 | 24,000 | 24,000
Provision for loan losses |  |  | 18,000 |  | 15,000
Balance, end of year | 43,000 |  | 43,000 |  | 9,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 43,000 |  | 43,000 |  | 9,000
Collectively evaluated for impairment, Related loan balance | 3,662,000 |  | 3,662,000 |  | 2,553,000
Construction And Land Development [Member] | Real Estate Loan | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 16,000 |  |
Balance, end of year |  |  |  |  | 16,000
Farmland | Real Estate Loan |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 2,000 | 2,000 | 2,000
Balance, end of year | 11,000 |  | 11,000 |  | 2,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 11,000 |  | 11,000 |  | 2,000
Collectively evaluated for impairment, Related loan balance | 345,000 |  | 345,000 |  | 350,000
Farmland | Real Estate Loan | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 9,000 |  |
Balance, end of year |  |  |  |  | 9,000
Single-family | Real Estate Loan |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 513,000 | 849,000 | 849,000
Recoveries |  |  | 346,000 |  | 266,000
Provision for loan losses |  |  | (544,000) |  | 602,000
Balance, end of year | 1,169,000 |  | 1,169,000 |  | 513,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 10,000 |  | 10,000 |  | 11,000
Individually evaluated for impairment, Related loan balance | 37,000 |  | 37,000 |  | 132,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 1,159,000 |  | 1,159,000 |  | 513,000
Collectively evaluated for impairment, Related loan balance | 79,012,000 |  | 79,012,000 |  | 82,388,000
Single-family | Real Estate Loan | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 854,000 |  |
Balance, end of year |  |  |  |  | 854,000
Multi-family | Real Estate Loan |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 39,000 | 40,000 | 40,000
Provision for loan losses |  |  | 3,000 |  | 1,000
Balance, end of year | 105,000 |  | 105,000 |  | 39,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 105,000 |  | 105,000 |  | 39,000
Collectively evaluated for impairment, Related loan balance | 5,846,000 |  | 5,846,000 |  | 6,105,000
Multi-family | Real Estate Loan | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 63,000 |  |
Balance, end of year |  |  |  |  | 63,000
Commercial and industrial | Commercial and Industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 67,000 | 69,000 | 69,000
Recoveries |  |  |  |  | 20,000
Provision for loan losses |  |  | (21,000) |  | 22,000
Balance, end of year | 166,000 |  | 166,000 |  | 67,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Related loan balance |  |  |  |  | 4,493,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 166,000 |  | 166,000 |  | 67,000
Collectively evaluated for impairment, Related loan balance | 10,078,000 |  | 10,078,000 |  | 6,307,000
Commercial and industrial | Commercial and Industrial | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 120,000 |  |
Balance, end of year |  |  |  |  | 120,000
Commercial | Real Estate Loan |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 218,000 | 241,000 | 241,000
Provision for loan losses |  |  | 11,000 |  | 23,000
Balance, end of year | 428,000 |  | 428,000 |  | 218,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 2,124,000 |  | 2,124,000 |  |
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 428,000 |  | 428,000 |  | 218,000
Collectively evaluated for impairment, Related loan balance | 53,036,000 |  | 53,036,000 |  | 57,027,000
Commercial | Real Estate Loan | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 199,000 |  |
Balance, end of year |  |  |  |  | 199,000
SBA Guaranty | Commercial and Industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 48,000 | 25,000 | 25,000
Provision for loan losses |  |  | (3,000) |  | (23,000)
Balance, end of year | 39,000 |  | 39,000 |  | 48,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 39,000 |  | 39,000 |  | 48,000
Collectively evaluated for impairment, Related loan balance | 6,930,000 |  | 6,930,000 |  | 7,200,000
SBA Guaranty | Commercial and Industrial | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | (6,000) |  |
Balance, end of year |  |  |  |  | (6,000)
Comm SBA PPP | Commercial and Industrial |  |  |  |  |
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Related loan balance | 2,571,000 |  | 2,571,000 |  | 9,912,000
Consumer and Indirect | Consumer Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 11,000 | 11,000 | 11,000
Charged off |  |  | (3,000) |  |
Recoveries |  |  |  |  | 6,000
Provision for loan losses |  |  | 18,000 |  | 6,000
Balance, end of year | 72,000 |  | 72,000 |  | 11,000
Individually evaluated for impairment: |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  | 11,000
Individually evaluated for impairment, Related loan balance |  |  |  |  | 39,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 72,000 |  | 72,000 |  |
Collectively evaluated for impairment, Related loan balance | 2,398,000 |  | 2,398,000 |  | 3,024,000
Consumer and Indirect | Consumer Loans | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 46,000 |  |
Balance, end of year |  |  |  |  | 46,000
Automobile | Consumer Loans |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | 569,000 | $ 805,000 | 805,000
Charged off |  |  | (190,000) |  | (392,000)
Recoveries |  |  | 180,000 |  | 199,000
Provision for loan losses |  |  | (75,000) |  | 43,000
Balance, end of year | 757,000 |  | 757,000 |  | 569,000
Collectively evaluated for impairment: |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 757,000 |  | 757,000 |  | 569,000
Collectively evaluated for impairment, Related loan balance | $ 58,635,000 |  | 58,635,000 |  | 74,242,000
Automobile | Consumer Loans | ASU 2016-13 |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | $ 273,000 |  |
Balance, end of year |  |  |  |  | $ 273,000

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