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BORROWED FUNDS - Senior Notes (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 19, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Senior notes, net |  | $ 14,685,000 | $ 14,685,000 | $ 0
Senior Notes with an aggregate par value of $15,000,000; bearing interest at 2.75% with an effective interest rate of 3.23%; maturing in June 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate par value | $ 15,000,000.0 | $ 15,000,000 | $ 15,000,000 |
Stated interest rate | 2.75% | 2.75% | 2.75% |
Debt issuance costs | $ 337,000 |  |  |
Senior notes, net | $ 14,663,000 | $ 14,685,000 | $ 14,685,000 | $ 0
Amortization of debt issuance costs |  | $ 15,000 | $ 22,000 |
Effective interest rate |  | 3.23% | 3.23% |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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