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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 Non-recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | $ 3,481,980 | $ 4,329,084
Fair Value, Measurements, Recurring | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 92,629 | 160,542
Fair Value, Measurements, Recurring | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 116,908 | 133,864
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 489,092 | 872,738
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 121,636 | 136,357
Fair Value, Measurements, Recurring | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 583,034 | 595,253
Fair Value, Measurements, Recurring | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 973,561 | 1,062,261
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets, fair value | 17,931 | 44,435
Liabilities |  |
Liabilities, fair value | 27,110 | 42,106
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 189,277 | 322
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 897,912 | 1,323,312
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Assets |  |
Assets, fair value | 0 | 0
Liabilities |  |
Liabilities, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets, fair value | 3,258,944 | 4,255,763
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 57,680 | 87,276
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 116,908 | 133,864
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 489,092 | 872,738
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 121,636 | 136,357
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 583,034 | 595,253
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 973,561 | 1,062,261
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets |  |
Assets, fair value | 17,906 | 44,380
Liabilities |  |
Liabilities, fair value | 27,110 | 42,106
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 1,215 | 322
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 897,912 | 1,323,312
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets, fair value | 223,036 | 73,321
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 34,949 | 73,266
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets |  |
Assets, fair value | 25 | 55
Liabilities |  |
Liabilities, fair value | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 188,062 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 2,373 | 4,819
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | 2,373 | 4,819
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets, fair value | 2,373 | 4,819
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | $ 2,373 | $ 4,819

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