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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Allowance for Credit Losses (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) borrower | Sep. 30, 2020 USD ($) borrower | Dec. 31, 2020 USD ($)
Financing Receivable, Allowance For Credit Losses [Line Items] |  |  |
Average loans | $ 239,492,000 | $ 281,773,000 |
Net charge-offs to average loans (annualized) | (0.19%) | 0.07% |
Number of borrowers | borrower | 20 | 30 |
Loans charged off | $ 193,000 | $ 277,000 | $ 392,000
Outstanding commitments | 30,600,000 | 33,100,000 |
Unfunded commitments |  |  |
Beginning balance | 33,000 | 37,000 | 37,000
Reduction of unfunded reserve | (34,000) |  |
Ending balance | 456,000 | 29,000 | $ 33,000
ASU 2016-13 |  |  |
Unfunded commitments |  |  |
Ending balance | $ 457,000 | $ (8,000) |

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- Definition The Average of Loans and Leases Receivable Net of Deferred Income. + References No definition available. + Details
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- Definition Net Charge Offs to Average Loans and Leases Receivables as a percentage + References No definition available. + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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