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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Affordable Housing Fund Investment |  |
Other Commitments [Line Items] |  |
Unfunded commitment | $ 12,600 |
Small Business Investment Companies |  |
Other Commitments [Line Items] |  |
Unfunded commitment | 5,600 |
Other Investments |  |
Other Commitments [Line Items] |  |
Unfunded commitment | 2,500 |
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 28,983 | $ 17,555
Variable Rate | 124,427 | 38,141
Unused lines of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 3,043 | 1,783
Variable Rate | 1,462,873 | 1,348,138
Letters of credit |  |
Other Commitments [Line Items] |  |
Fixed Rate | 487 | 234
Variable Rate | $ 7,694 | $ 8,274

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123345438&loc=d3e61044-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123345438&loc=d3e61082-112788 + Details
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