| **SECURITIES FINANCING ACTIVITIES - Gross Amounts of Liabilities Associated with Repurchase Agreements and Securities Lending Agreements by Class of Underlying Collateral (Details) - USD ($) $ in Thousands** | Dec. 31, 2022 | Dec. 31, 2021 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Assets Sold under Agreements to Repurchase [Line Items]**                                                                                                                                                     |          |          |
| Repurchase agreements                                                                                                                                                                                           | $ 37,333,394  | $ 5,583,781   |
| U.S. Treasury                                                                                                                                                                                                   |          |          |
| **Assets Sold under Agreements to Repurchase [Line Items]**                                                                                                                                                     |          |          |
| Repurchase agreements                                                                                                                                                                                           | 22,477,916    | 3,124,781     |
| Residential agency MBS                                                                                                                                                                                          |          |          |
| **Assets Sold under Agreements to Repurchase [Line Items]**                                                                                                                                                     |          |          |
| Repurchase agreements                                                                                                                                                                                           | 13,223,958    | 2,459,000     |
| Corporate and other securities                                                                                                                                                                                  |          |          |
| **Assets Sold under Agreements to Repurchase [Line Items]**                                                                                                                                                     |          |          |
| Repurchase agreements                                                                                                                                                                                           | $ 1,631,520   | $ 0           |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312
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