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FAIR VALUE - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Assets Pledged As Collateral For Loans Receivable [Line Items] |  |  |  |
Mortgage servicing rights | $ 4,300,000 |  |  |
Valuation reserve | (197,000) | $ 246,000 |  |
Amortized cost | 3,800,000 |  |  |
Servicing Asset at Fair Value, Amount | $ 4,300,000 |  |  |
Percentage of discount from appraised value (in hundredths) | 3.63% |  |  |
Weighted average maturity of residential mortgages | 20 years |  |  |
Prepayment Speed used in unobservable assumptions | 152 |  | 204 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Qualitative Information | 152 |  | 204 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 9.40% |  | 9.40% |
Discount rate used to estimate fair value (in hundredths) | 9.40% |  | 9.40% |
Subtotal | $ 4,484,767,000 |  | $ 4,657,183,000 |
Valuation allowance | 71,844,000 | 53,609,000 | $ 61,408,000 | $ 50,652,000
Provision for Loan and Lease Losses | 815,000 | 142,000 |  |
Recoveries | 145,000 | 206,000 |  |
Loans and Leases Receivable, Gross | 19,600,000 | 17,400,000 |  |
Loans and Leases Receivable, Allowance | 8,500,000 | $ 7,400,000 |  |
Mortgage servicing rights, fair value | 4,300,000 |  |  |
Mortgage servicing rights, impairment | 518,000 |  |  |
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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