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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Fair Value | $ 2,746,728 | $ 2,961,015
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 3,763,289 | 4,329,084
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 3,515 | 4,819
Asset-backed securities |  |
Assets |  |
Fair Value | 104,716 | 160,542
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 104,716 | 160,542
Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Fair Value | 118,469 | 133,864
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 118,469 | 133,864
Collateralized loan obligations |  |
Assets |  |
Fair Value | 815,856 | 872,738
Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 815,856 | 872,738
Commercial mortgage-backed securities |  |
Assets |  |
Fair Value | 131,188 | 136,357
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 131,188 | 136,357
Corporate notes |  |
Assets |  |
Fair Value | 578,897 | 595,253
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 578,897 | 595,253
Private label collateralized mortgage obligations |  |
Assets |  |
Fair Value | 997,602 | 1,062,261
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 997,602 | 1,062,261
Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 28,475 | 44,435
Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 25,520 | 322
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 962,566 | 1,323,312
Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 41,433 | 42,106
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 3,515 | 4,819
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 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 | 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 warehouse – 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 | 2,704,363 | 2,887,749
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 3,696,355 | 4,255,763
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 | 62,351 | 87,276
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 118,469 | 133,864
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 815,856 | 872,738
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 131,188 | 136,357
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 578,897 | 595,253
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 997,602 | 1,062,261
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 28,421 | 44,380
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 1,005 | 322
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 962,566 | 1,323,312
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 41,433 | 42,106
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 | 42,365 | 73,266
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 66,934 | 73,321
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 3,515 | 4,819
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Fair Value | 42,365 | 73,266
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 42,365 | 73,266
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) | 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 | 54 | 55
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 24,515 | 0
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – 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 | $ 3,515 | $ 4,819

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