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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, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | $ 4,329,084 | $ 6,118,942
Fair Value, Measurements, Recurring | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 160,542 | 297,425
Fair Value, Measurements, Recurring | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 9,553
Fair Value, Measurements, Recurring | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 2,152
Fair Value, Measurements, Recurring | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 133,864 | 196,930
Fair Value, Measurements, Recurring | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value |  | 238,844
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 872,738 | 1,066,802
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 136,357 | 148,927
Fair Value, Measurements, Recurring | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 595,253 | 580,046
Fair Value, Measurements, Recurring | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 1,062,261 | 1,242,465
Fair Value, Measurements, Recurring | State and political subdivision debt securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 8,431
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets, fair value | 44,435 | 27,295
Liabilities |  |
Liabilities, fair value | 42,106 | 26,544
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 322 | 15,747
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 1,323,312 | 2,284,325
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 mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 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) | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value |  | 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) | State and political subdivision debt securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 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 | 4,255,763 | 5,975,878
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 87,276 | 154,540
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 9,553
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 2,152
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 133,864 | 196,930
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value |  | 238,844
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 872,738 | 1,066,802
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 136,357 | 148,927
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate notes |  |
Assets |  |
Assets, available-for-sale, fair value | 595,253 | 580,046
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value | 1,062,261 | 1,242,465
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | State and political subdivision debt securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 8,431
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets |  |
Assets, fair value | 44,380 | 27,116
Liabilities |  |
Liabilities, fair value | 42,106 | 26,544
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets, fair value | 322 | 15,747
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, fair value | 1,323,312 | 2,284,325
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets, fair value | 73,321 | 143,064
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value | 73,266 | 142,885
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 0
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) | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets, available-for-sale, fair value |  | 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) | State and political subdivision debt securities |  |
Assets |  |
Assets, available-for-sale, fair value |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets |  |
Assets, fair value | 55 | 179
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 | 0 | 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 | 4,819 | 5,121
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | 4,819 | 5,121
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 | 4,819 | 5,121
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans |  |
Assets |  |
Assets, fair value | $ 4,819 | $ 5,121

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