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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 02, 2020 | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Feb. 28, 2022 | Oct. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Non-interest income related to changes in the fair value of derivative | $ 45,900 |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  |
Expected interest income on termination |  | $ 370,000 |  |  |  |  |  |  |
Interest Rate Swap Interest Income |  | $ 2,000 |  | $ 2,000 |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  |  |  |  | $ 300,000 |
Derivative, fixed interest rate |  |  |  |  |  |  |  | 1.6725% |
Initial floating rate of interest |  |  |  |  |  |  |  | 0.2414% |
Interest Rate Swap | Cash flow hedges |  |  |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of derivatives | $ 400,000 |  |  |  |  |  |  |  | $ 400,000
Derivative, fixed interest rate |  |  |  |  |  |  |  |  | 3.018%

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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