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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Impaired Financing Receivables (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | $ 27,000 | $ 27,000
Unpaid Principal Balance with specific reserves | 37,000 | 38,000
Interest Income Recognized with specific reserves | 1,000 | 2,000
Specific Reserve with specific reserves | 10,000 | 11,000
Average Recorded Investment | 49,000 | 50,000
Recorded Investment with no specific reserve | 2,744,000 | 4,876,000
Unpaid Principal Balance with no specific reserve | 2,744,000 | 4,876,000
Interest Income Recognized with no specific reserve | 340,000 | 199,000
Average Recorded Investment with no specific reserve | 3,220,000 | 5,129,000
Real Estate Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 27,000 | 27,000
Unpaid Principal Balance with specific reserves | 37,000 | 38,000
Interest Income Recognized with specific reserves | 1,000 | 2,000
Specific Reserve with specific reserves | 10,000 | 11,000
Average Recorded Investment | 49,000 | 50,000
Recorded Investment with no specific reserve | 2,547,000 | 4,725,000
Unpaid Principal Balance with no specific reserve | 2,547,000 | 4,725,000
Interest Income Recognized with no specific reserve | 334,000 | 185,000
Average Recorded Investment with no specific reserve | 3,000,000 | 4,859,000
Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 71,000 |
Unpaid Principal Balance with no specific reserve | 71,000 |
Interest Income Recognized with no specific reserve | 1,000 |
Average Recorded Investment with no specific reserve | 71,000 |
Consumer Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 126,000 | 151,000
Unpaid Principal Balance with no specific reserve | 126,000 | 151,000
Interest Income Recognized with no specific reserve | 5,000 | 14,000
Average Recorded Investment with no specific reserve | 149,000 | 270,000
Single-family | Real Estate Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 27,000 | 27,000
Unpaid Principal Balance with specific reserves | 37,000 | 38,000
Interest Income Recognized with specific reserves | 1,000 | 2,000
Specific Reserve with specific reserves | 10,000 | 11,000
Average Recorded Investment | 49,000 | 50,000
Recorded Investment with no specific reserve | 95,000 | 232,000
Unpaid Principal Balance with no specific reserve | 95,000 | 232,000
Interest Income Recognized with no specific reserve | 1,000 |
Average Recorded Investment with no specific reserve | 99,000 | 544,000
Single-family | Consumer Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance with specific reserves | 36,532 |
Specific Reserve | 10,359 |
Commercial | Real Estate Loan |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 2,452,000 | 4,493,000
Unpaid Principal Balance with no specific reserve | 2,452,000 | 4,493,000
Interest Income Recognized with no specific reserve | 333,000 | 185,000
Average Recorded Investment with no specific reserve | 2,901,000 | 4,315,000
SBA Guaranty | Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 71,000 |
Unpaid Principal Balance with no specific reserve | 71,000 |
Interest Income Recognized with no specific reserve | 1,000 |
Average Recorded Investment with no specific reserve | 71,000 |
Consumer and Indirect | Consumer Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Specific Reserve with specific reserves |  | 11,000
Recorded Investment with no specific reserve |  | 34,000
Unpaid Principal Balance with no specific reserve |  | 34,000
Interest Income Recognized with no specific reserve |  | 4,000
Average Recorded Investment with no specific reserve |  | 43,000
Automobile | Consumer Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 126,000 | 117,000
Unpaid Principal Balance with no specific reserve | 126,000 | 117,000
Interest Income Recognized with no specific reserve | 5,000 | 10,000
Average Recorded Investment with no specific reserve | $ 149,000 | $ 227,000

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