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DERIVATIVE FINANCIAL INSTRUMENTS - (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Asset pledged |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Available-for-sale securities pledged as collateral | $ 7,069,000 |  | $ 7,069,000 |  |
Interest rate swap agreements |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Aggregate notional amount | 123,990,000 |  | 123,990,000 |  | $ 135,740,000
Asset Derivatives, Notional Amount | 61,995,000 |  | 61,995,000 |  | 67,870,000
Asset Derivatives, Fair Value | 3,902,000 |  | 3,902,000 |  | 6,566,000
Liability Derivatives, Notional Amount | 61,995,000 |  | 61,995,000 |  | 67,870,000
Liability Derivatives, Fair Value | 3,902,000 |  | 3,902,000 |  | $ 6,566,000
Derivatives not designated as hedging instruments | Interest rate swap agreements |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Interest rate swap | 0 | $ 0 | 0 | $ 0 |
Increase (decrease) in interest income | $ 335,000 | $ 351,000 | $ 1,013,000 | $ 351,000 |

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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