| **LOANS AND ALLOWANCE FOR CREDIT LOSSES (As Restated) (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Thousands** | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Allowance for Loan Losses [Roll Forward]**                                                                                            |           |   |
| Allowance for loan losses, beginning of period                                                                                          | $ 1,701,602    | $ 834,337 |
| Provision for loan losses                                                                                                               | 1,058,639      | 350,869 |
| Other                                                                                                                                   | (27,117)       |   |
| Charge-offs                                                                                                                             | (962,314)      | (172,838) |
| Recoveries                                                                                                                              | 510,477        | 78,264 |
| Charge-offs, net of recoveries                                                                                                          | (451,837)      | (94,574) |
| Allowance for loan losses, end of period                                                                                                | 2,281,287      | 1,090,632 |
| **Reserve for Unfunded Lending Commitments [Roll Forward]**                                                                             |           |   |
| Reserve for unfunded lending commitments, beginning of period                                                                           | 132,641        | 220,000 |
| Provision for/ (Recovery of) unfunded lending commitments                                                                               | (5,000)        | (40,000) |
| Loss on unfunded lending commitments                                                                                                    | 0              |   |
| Reserve for unfunded lending commitments, end of period                                                                                 | 127,641        | 180,000 |
| Total allowance for credit losses, end of period                                                                                        | 2,408,928      | 1,270,632 |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                        |           |   |
| Ending balance, individually evaluated for impairment                                                                                   | 365,118        | 220,063 |
| Ending balance, collectively evaluated for impairment                                                                                   | 1,916,169      | 870,569 |
| Total financing receivables                                                                                                             | 79,800,855     | 74,317,576 |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                                    | 2,037,991      | 1,766,814 |
| Ending balance, individually evaluated for impairment                                                                                   | 3,498,395      | 1,390,021 |
| Financing receivables, ending balance, collectively evaluated for impairment                                                            | 74,264,469     | 71,160,741 |
| Commercial [Member]                                                                                                                     |           |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                                            |           |   |
| Allowance for loan losses, beginning of period                                                                                          | 401,553        | 443,074 |
| Provision for loan losses                                                                                                               | 24,801         | 21,891 |
| Other                                                                                                                                   | 0              |   |
| Charge-offs                                                                                                                             | (19,339)       | (29,593) |
| Recoveries                                                                                                                              | 5,999          | 5,388 |
| Charge-offs, net of recoveries                                                                                                          | (13,340)       | (24,205) |
| Allowance for loan losses, end of period                                                                                                | 413,014        | 440,760 |
| **Reserve for Unfunded Lending Commitments [Roll Forward]**                                                                             |           |   |
| Reserve for unfunded lending commitments, beginning of period                                                                           | 132,641        | 220,000 |
| Provision for/ (Recovery of) unfunded lending commitments                                                                               | (5,000)        | (40,000) |
| Loss on unfunded lending commitments                                                                                                    | 0              |   |
| Reserve for unfunded lending commitments, end of period                                                                                 | 127,641        | 180,000 |
| Total allowance for credit losses, end of period                                                                                        | 540,655        | 620,760 |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                        |           |   |
| Ending balance, individually evaluated for impairment                                                                                   | 78,665         | 84,124 |
| Ending balance, collectively evaluated for impairment                                                                                   | 334,349        | 356,637 |
| Total financing receivables                                                                                                             | 38,335,323     | 34,310,555 |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                                    | 44,325         | 44,627 |
| Ending balance, individually evaluated for impairment                                                                                   | 478,179        | 529,260 |
| Financing receivables, ending balance, collectively evaluated for impairment                                                            | 37,812,819     | 33,736,668 |
| Consumer [Member]                                                                                                                       |           |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                                            |           |   |
| Allowance for loan losses, beginning of period                                                                                          | 1,267,025      | 363,647 |
| Provision for loan losses                                                                                                               | 995,563        | 312,105 |
| Other                                                                                                                                   | (27,117)       |   |
| Charge-offs                                                                                                                             | (942,975)      | (143,245) |
| Recoveries                                                                                                                              | 504,478        | 72,876 |
| Charge-offs, net of recoveries                                                                                                          | (438,497)      | (70,369) |
| Allowance for loan losses, end of period                                                                                                | 1,796,974      | 605,383 |
| **Reserve for Unfunded Lending Commitments [Roll Forward]**                                                                             |           |   |
| Total allowance for credit losses, end of period                                                                                        | 1,796,974      | 605,383 |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                        |           |   |
| Ending balance, individually evaluated for impairment                                                                                   | 286,453        | 135,939 |
| Ending balance, collectively evaluated for impairment                                                                                   | 1,510,521      | 469,443 |
| Total financing receivables                                                                                                             | 41,465,532     | 40,007,021 |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                                    | 1,993,666      | 1,722,187 |
| Ending balance, individually evaluated for impairment                                                                                   | 3,020,216      | 860,761 |
| Financing receivables, ending balance, collectively evaluated for impairment                                                            | 36,451,650     | 37,424,073 |
| Unallocated [Member]                                                                                                                    |           |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                                            |           |   |
| Allowance for loan losses, beginning of period                                                                                          | 33,024         | 27,616 |
| Provision for loan losses                                                                                                               | 38,275         | 16,873 |
| Other                                                                                                                                   | 0              |   |
| Charge-offs                                                                                                                             | 0              | 0 |
| Recoveries                                                                                                                              | 0              | 0 |
| Charge-offs, net of recoveries                                                                                                          | 0              | 0 |
| Allowance for loan losses, end of period                                                                                                | 71,299         | 44,489 |
| **Reserve for Unfunded Lending Commitments [Roll Forward]**                                                                             |           |   |
| Total allowance for credit losses, end of period                                                                                        | 71,299         | 44,489 |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                        |           |   |
| Ending balance, individually evaluated for impairment                                                                                   | 0              | 0 |
| Ending balance, collectively evaluated for impairment                                                                                   | 71,299         | 44,489 |
| Total financing receivables                                                                                                             | 0              | 0 |
| Ending balance, evaluated under the fair value option or lower of cost or fair value                                                    | 0              | 0 |
| Ending balance, individually evaluated for impairment                                                                                   | 0              | 0 |
| Financing receivables, ending balance, collectively evaluated for impairment                                                            | 0              | 0 |
| Retail installment contracts and auto loans [Member]                                                                                    |           |   |
| **Allowance for Loan Losses [Roll Forward]**                                                                                            |           |   |
| Allowance for loan losses, beginning of period                                                                                          | 709,987        | 0 |
| Provision for loan losses                                                                                                               | 879,043        | 220,086 |
| Other                                                                                                                                   | (27,117)       |   |
| Charge-offs                                                                                                                             | (806,626)      | (77,325) |
| Recoveries                                                                                                                              | 484,097        | 58,507 |
| Charge-offs, net of recoveries                                                                                                          | (322,529)      | (18,818) |
| Allowance for loan losses, end of period                                                                                                | 1,239,384      | $ 201,268 |
| Retail installment contracts and auto loans [Member] | Consumer [Member]                                                                |           |   |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                        |           |   |
| Loans held-for-sale                                                                                                                     | $ 1,000,000    |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible and reserve for unfunded lending commitments.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net amount of direct write-downs and recoveries of financing receivables charged against the allowance.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing Receivable, Allowance for Credit Losses, Other
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables including loans held-for-sale, before allowance for credit losses.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gain (Loss) on Unfunded Commitments
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loans Receivable Held-for-sale, Net, Fair Value Option
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net change in reserve for unfunded commitments which is included in the provision for credit losses.
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No definition available.
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| X                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reserve for unfunded loan commitments and letters of credit.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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No definition available.
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| X                                                                                                                                                                                                                                                |
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| - References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The increase (decrease) in the allowance for credit losses related to financing receivables.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were individually evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
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