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DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Fair Value | $ 1,979,832 | $ 1,985,438
Derivatives | 12,631 | 15,263
Loans held for sale – fair value option | 2,469 | 163,891
Loans receivable, fair value option | 15,831,500 | 14,104,884
Liabilities |  |
Derivative liabilities | 17,430 | 22,570
Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives | 12,631 | 15,263
Loans held for sale – fair value option | 2,469 | 163,891
Assets, fair value | 3,593,546 | 3,485,720
Liabilities |  |
Derivative liabilities | 17,430 | 22,570
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 23,749 | 18,048
Asset-backed securities |  |
Assets |  |
Fair Value | 281,839 | 13,236
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 281,839 | 13,236
Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Fair Value | 444,086 | 327,038
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 444,086 | 327,038
Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Fair Value | 482,614 | 226,746
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 482,614 | 226,746
Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Fair Value | 94,789 | 93,075
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 94,789 | 93,075
Collateralized loan obligations |  |
Assets |  |
Fair Value | 10,660 | 255,407
Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 10,660 | 255,407
Commercial mortgage-backed securities |  |
Assets |  |
Fair Value |  | 77,708
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 77,708
Corporate notes |  |
Assets |  |
Fair Value | 299,432 | 516,330
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 299,432 | 516,330
Private label collateralized mortgage obligations |  |
Assets |  |
Fair Value | 366,412 | 475,898
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 366,412 | 475,898
Mortgage Finance | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 1,486,978 | 1,321,128
Installment Loans | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 111,636 |
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 11,317 | 18,048
Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 12,432 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Fair Value | 0 | 0
Derivatives | 0 | 0
Loans receivable, fair value option | 0 | 0
Liabilities |  |
Derivative liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives | 0 | 0
Loans held for sale – fair value option | 0 | 0
Assets, fair value | 0 | 0
Liabilities |  |
Derivative liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage Finance | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Installment Loans | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 |
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair Value | 1,697,993 | 1,972,202
Derivatives | 12,613 | 15,223
Loans receivable, fair value option | 1,486,978 | 1,321,128
Liabilities |  |
Derivative liabilities | 17,430 | 22,570
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives | 12,613 | 15,223
Loans held for sale – fair value option | 2,229 | 1,836
Assets, fair value | 3,199,813 | 3,310,389
Liabilities |  |
Derivative liabilities | 17,430 | 22,570
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 444,086 | 327,038
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 482,614 | 226,746
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 94,789 | 93,075
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 10,660 | 255,407
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 77,708
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 299,432 | 516,330
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 366,412 | 475,898
Significant Other Observable Inputs (Level 2) | Mortgage Finance | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 1,486,978 | 1,321,128
Significant Other Observable Inputs (Level 2) | Installment Loans | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 0 |
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 |
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair Value | 281,839 | 13,236
Derivatives | 18 | 40
Loans receivable, fair value option | 14,344,522 | 12,783,756
Liabilities |  |
Derivative liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives | 18 | 40
Loans held for sale – fair value option | 240 | 162,055
Assets, fair value | 393,733 | 175,331
Liabilities |  |
Derivative liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 23,749 | 18,048
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Fair Value | 281,839 | 13,236
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 281,839 | 13,236
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 0
Significant Unobservable Inputs (Level 3) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Mortgage Finance | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 0 | 0
Significant Unobservable Inputs (Level 3) | Installment Loans | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans receivable, fair value option | 111,636 |
Significant Unobservable Inputs (Level 3) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 11,317 | $ 18,048
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | $ 12,432 |

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