| **FAIR VALUE - Fair Value Measurements, Recurring (Details) - USD ($)**                     | Jun. 30, 2023   | Dec. 31, 2022   |
|---------------------------------------------------------------------------------------------|-----------------|-----------------|
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | $ 6,473,711,000 | $ 7,030,219,000 |
| Trading securities                                                                          | 7,893,256,000   | 5,864,324,000   |
| Federal funds sold and securities purchased under resale agreements or similar arrangements | 1,596,541,000   | 234,169,000     |
| RICs HFI                                                                                    | 17,000,000      | 20,900,000      |
| LHFS                                                                                        | 528,000         | 549,000         |
| Other assets - derivatives                                                                  | 1,416,618,000   | 1,390,218,000   |
| **Financial liabilities:**                                                                  |            |            |
| Federal funds purchased and securities loaned or sold under repurchase agreements           | 766,896,000     | 245,149,000     |
| Trading liabilities                                                                         | 2,413,111,000   | 2,871,645,000   |
| Other liabilities - derivatives                                                             | 1,847,525,000   | 2,024,273,000   |
| U.S. Treasury securities                                                                    |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 27,927,000      | 218,439,000     |
| Corporate debt                                                                              |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 331,792,000     | 370,491,000     |
| ABS                                                                                         |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 503,357,000     | 504,018,000     |
| Recurring                                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 6,473,711,000   | 7,030,219,000   |
| Trading securities                                                                          | 7,893,256,000   | 5,864,324,000   |
| Federal funds sold and securities purchased under resale agreements or similar arrangements | 1,596,541,000   | 234,169,000     |
| RICs HFI                                                                                    | 16,983,000      | 20,924,000      |
| LHFS                                                                                        | 528,000         | 549,000         |
| MSRs                                                                                        | 105,241,000     | 107,383,000     |
| Other assets - derivatives                                                                  | 1,416,618,000   | 1,390,217,000   |
| Total financial assets                                                                      | 17,502,878,000  | 14,647,785,000  |
| **Financial liabilities:**                                                                  |            |            |
| Federal funds purchased and securities loaned or sold under repurchase agreements           | 766,898,000     | 245,149,000     |
| Trading liabilities                                                                         | 2,413,111,000   | 2,871,645,000   |
| Other liabilities - derivatives                                                             | 1,847,526,000   | 2,024,273,000   |
| Total financial liabilities                                                                 | 5,027,535,000   | 5,141,067,000   |
| Recurring | U.S. Treasury securities                                                        |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 27,927,000      | 218,439,000     |
| Recurring | Corporate debt                                                                  |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 331,792,000     | 370,491,000     |
| Recurring | ABS                                                                             |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 503,357,000     | 504,018,000     |
| Recurring | MBS                                                                             |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 5,610,635,000   | 5,937,271,000   |
| Recurring | Level 1                                                                         |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 27,927,000      | 218,439,000     |
| Trading securities                                                                          | 1,028,052,000   | 1,229,279,000   |
| Federal funds sold and securities purchased under resale agreements or similar arrangements | 0               | 0               |
| RICs HFI                                                                                    | 0               | 0               |
| LHFS                                                                                        | 0               | 0               |
| MSRs                                                                                        | 0               | 0               |
| Other assets - derivatives                                                                  | 9,150,000       | 602,000         |
| Total financial assets                                                                      | 1,065,129,000   | 1,448,320,000   |
| **Financial liabilities:**                                                                  |            |            |
| Federal funds purchased and securities loaned or sold under repurchase agreements           | 0               | 0               |
| Trading liabilities                                                                         | 2,041,730,000   | 2,557,495,000   |
| Other liabilities - derivatives                                                             | 9,847,000       | 448,000         |
| Total financial liabilities                                                                 | 2,051,577,000   | 2,557,943,000   |
| Recurring | Level 1 | U.S. Treasury securities                                              |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 27,927,000      | 218,439,000     |
| Recurring | Level 1 | Corporate debt                                                        |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 1 | ABS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 1 | MBS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 2                                                                         |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 6,445,784,000   | 6,811,780,000   |
| Trading securities                                                                          | 6,862,622,000   | 4,634,676,000   |
| Federal funds sold and securities purchased under resale agreements or similar arrangements | 1,596,541,000   | 234,169,000     |
| RICs HFI                                                                                    | 0               | 0               |
| LHFS                                                                                        | 528,000         | 549,000         |
| MSRs                                                                                        | 0               | 0               |
| Other assets - derivatives                                                                  | 1,407,446,000   | 1,389,593,000   |
| Total financial assets                                                                      | 16,312,921,000  | 13,070,767,000  |
| **Financial liabilities:**                                                                  |            |            |
| Federal funds purchased and securities loaned or sold under repurchase agreements           | 766,898,000     | 245,149,000     |
| Trading liabilities                                                                         | 371,151,000     | 313,920,000     |
| Other liabilities - derivatives                                                             | 1,836,289,000   | 2,021,593,000   |
| Total financial liabilities                                                                 | 2,974,338,000   | 2,580,662,000   |
| Recurring | Level 2 | U.S. Treasury securities                                              |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 2 | Corporate debt                                                        |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 331,792,000     | 370,491,000     |
| Recurring | Level 2 | ABS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 503,357,000     | 504,018,000     |
| Recurring | Level 2 | MBS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 5,610,635,000   | 5,937,271,000   |
| Recurring | Level 3                                                                         |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Trading securities                                                                          | 2,582,000       | 369,000         |
| Federal funds sold and securities purchased under resale agreements or similar arrangements | 0               | 0               |
| RICs HFI                                                                                    | 16,983,000      | 20,924,000      |
| LHFS                                                                                        | 0               | 0               |
| MSRs                                                                                        | 105,241,000     | 107,383,000     |
| Other assets - derivatives                                                                  | 22,000          | 22,000          |
| Total financial assets                                                                      | 124,828,000     | 128,698,000     |
| **Financial liabilities:**                                                                  |            |            |
| Federal funds purchased and securities loaned or sold under repurchase agreements           | 0               | 0               |
| Trading liabilities                                                                         | 230,000         | 230,000         |
| Other liabilities - derivatives                                                             | 1,390,000       | 2,232,000       |
| Total financial liabilities                                                                 | $ 1,620,000     | 2,462,000       |
| Percentage of level 3 assets to total assets held at fair value                             | 0.70%           |            |
| Percentage of level 3 assets to total assets                                                | 0.10%           |            |
| Recurring | Level 3 | U.S. Treasury securities                                              |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | $ 0             | 0               |
| Recurring | Level 3 | Corporate debt                                                        |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 3 | ABS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | 0               | 0               |
| Recurring | Level 3 | MBS                                                                   |            |            |
| **Financial assets:**                                                                       |            |            |
| Investments in debt securities AFS                                                          | $ 0             | $ 0             |

| X                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of Level 3 Assets to Total Assets
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| - Definition
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.
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Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell.
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Fair value of financial and nonfinancial obligations.
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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.
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The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements.
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).
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