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FAIR VALUE DISCLOSURES - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 3.49% |
Mortgage servicing rights | $ 2,900,000 |
Amortized cost | 3,400,000 |
Mortgage servicing rights, impairment | $ 518,000 |
Weighted average maturity of residential mortgages | 20 years |
Qualitative information used to estimate fair value | 2.67% | 2.04%
Discount rate used to estimate fair value | 9.50% | 9.40%
Minimum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Amount of variance | $ 100,000 |
Minimum | Commercial Real Estates | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 0.00% |
Minimum | Inventory Finished Goods | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 35.00% |
Minimum | Finished Goods | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |
Minimum | Inventory Work In Process | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 50.00% |
Minimum | Equipment | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |
Minimum | Marketable Securities | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 10.00% |
Maximum | Commercial Real Estates | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 50.00% |
Maximum | Inventory Finished Goods | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 65.00% |
Maximum | Finished Goods | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 60.00% |
Maximum | Inventory Work In Process | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 100.00% |
Maximum | Equipment | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 70.00% |
Maximum | Marketable Securities | Level 3 |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of discount from appraised value (in hundredths) | 30.00% |
Municipal Notes | Minimum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | (5.00%) |
Municipal Notes | Maximum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | 5.00% |
US Government Agencies Short-term Debt Securities | Minimum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | (3.00%) |
US Government Agencies Short-term Debt Securities | Maximum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | 3.00% |
U.S. Treasury securities | Minimum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | (1.00%) |
U.S. Treasury securities | Maximum |  |
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |
Percentage of variance | 1.00% |

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