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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Fair Value | $ 2,571,139 | $ 2,376,860
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 3,775,071 | 3,481,980
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 7,747 | 2,373
Asset-backed securities |  |
Assets |  |
Fair Value | 58,234 | 92,629
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 58,234 | 92,629
Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Fair Value | 86,412 |
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 86,412 |
Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Fair Value | 124,958 | 116,908
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 124,958 | 116,908
Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Fair Value | 33,774 |
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 33,774 |
Collateralized loan obligations |  |
Assets |  |
Fair Value | 584,495 | 489,092
Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 584,495 | 489,092
Commercial mortgage-backed securities |  |
Assets |  |
Fair Value | 112,626 | 121,636
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 112,626 | 121,636
Corporate notes |  |
Assets |  |
Fair Value | 610,470 | 583,034
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 610,470 | 583,034
Private label collateralized mortgage obligations |  |
Assets |  |
Fair Value | 960,170 | 973,561
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 960,170 | 973,561
Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 21,437 | 17,931
Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 219,885 | 189,277
Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 962,610 | 897,912
Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 31,958 | 27,110
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 7,747 | 2,373
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Fair Value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 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 |
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 |
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 | 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) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Fair Value | 2,542,876 | 2,341,911
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 3,527,716 | 3,258,944
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 | 29,971 | 57,680
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 86,412 |
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 124,958 | 116,908
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 33,774 |
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 584,495 | 489,092
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 112,626 | 121,636
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 610,470 | 583,034
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 960,170 | 973,561
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 21,360 | 17,906
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 870 | 1,215
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 962,610 | 897,912
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 31,958 | 27,110
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Fair Value | 28,263 | 34,949
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 247,355 | 223,036
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 7,747 | 2,373
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Fair Value | 28,263 | 34,949
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 28,263 | 34,949
Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 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 |
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 | 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) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 77 | 25
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 219,015 | 188,062
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage finance – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | $ 7,747 | $ 2,373

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