| **FAIR VALUE - Reconciliation of Assets and Liabilities Using Level 3 Inputs (Details) - Level 3 - Recurring - USD ($) $ in Thousands** | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]**          |           |   |
| Balances, beginning of period                                                                                                           | $ 126,236      | $ 113,162 |
| Losses in OCI                                                                                                                           | 0              | 0 |
| Gains/(losses) in earnings                                                                                                              | (2,710)        | 20,851 |
| Additions/Issuances                                                                                                                     | 0              | 2,520 |
| Transfer from Level 2                                                                                                                   | 2,219          | 0 |
| Settlements                                                                                                                             | (4,634)        | (8,919) |
| Balances, end of period                                                                                                                 | 121,111        | 127,614 |
| Changes in unrealized gains (losses) included in earnings related to balances still held at end of period                               | (2,710)        | 23,808 |
| RICs HFI                                                                                                                                |           |   |
| **Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]**          |           |   |
| Balances, beginning of period                                                                                                           | 20,924         | 33,529 |
| Losses in OCI                                                                                                                           | 0              | 0 |
| Gains/(losses) in earnings                                                                                                              | 0              | 0 |
| Additions/Issuances                                                                                                                     | 0              | 0 |
| Transfer from Level 2                                                                                                                   | 0              | 0 |
| Settlements                                                                                                                             | (2,100)        | (4,044) |
| Balances, end of period                                                                                                                 | 18,824         | 29,485 |
| Changes in unrealized gains (losses) included in earnings related to balances still held at end of period                               | 0              | 0 |
| MSRs                                                                                                                                    |           |   |
| **Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]**          |           |   |
| Balances, beginning of period                                                                                                           | 107,383        | 79,107 |
| Losses in OCI                                                                                                                           | 0              | 0 |
| Gains/(losses) in earnings                                                                                                              | (2,539)        | 22,765 |
| Additions/Issuances                                                                                                                     | 0              | 2,520 |
| Transfer from Level 2                                                                                                                   | 0              | 0 |
| Settlements                                                                                                                             | (2,534)        | (4,875) |
| Balances, end of period                                                                                                                 | 102,310        | 99,517 |
| Changes in unrealized gains (losses) included in earnings related to balances still held at end of period                               | (2,539)        | 22,765 |
| Derivatives, net                                                                                                                        |           |   |
| **Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]**                                                                |           |   |
| Balances, beginning of period                                                                                                           | (2,210)        | 526 |
| Losses in OCI                                                                                                                           | 0              | 0 |
| Gains/(losses) in earnings                                                                                                              | (169)          | (1,914) |
| Additions/Issuances                                                                                                                     | 0              | 0 |
| Transfer from Level 2                                                                                                                   | 0              | 0 |
| Settlements                                                                                                                             | 0              | 0 |
| Balances, end of period                                                                                                                 | (2,379)        | (1,388) |
| **Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]**          |           |   |
| Changes in unrealized gains (losses) included in earnings related to balances still held at end of period                               | (169)          | 1,043 |
| Other                                                                                                                                   |           |   |
| **Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]**          |           |   |
| Balances, beginning of period                                                                                                           | 139            | 0 |
| Losses in OCI                                                                                                                           | 0              | 0 |
| Gains/(losses) in earnings                                                                                                              | (2)            | 0 |
| Additions/Issuances                                                                                                                     | 0              | 0 |
| Transfer from Level 2                                                                                                                   | 2,219          |  |
| Settlements                                                                                                                             | 0              | 0 |
| Balances, end of period                                                                                                                 | 2,356          | 0 |
| Changes in unrealized gains (losses) included in earnings related to balances still held at end of period                               | $ (2)          | $ 0 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.
+ References
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| - Definition
Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).
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| - Definition
Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).
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| - Definition
Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.
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| - Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| X                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).
+ References
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| - Definition
Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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