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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, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets | $ 6,118,942 | $ 4,886,449
Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Assets |  | 3,854
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets | 27,295 | 54,223
Liabilities |  |
Liabilities | 26,544 | 98,164
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets | 15,747 | 5,509
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 2,284,325 | 3,616,432
Fair Value, Measurements, Recurring | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 297,425 | 377,145
Fair Value, Measurements, Recurring | AFS debt securities | U.S. government agencies securities |  |
Assets |  |
Assets |  | 20,034
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 9,553 | 63,091
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 2,152 |
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets | 196,930 | 140,841
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 238,844 |
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets |  | 20,926
Fair Value, Measurements, Recurring | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 1,066,802 | 32,367
Fair Value, Measurements, Recurring | AFS debt securities | Commercial mortgage-backed securities |  |
Assets |  |
Assets | 148,927 |
Fair Value, Measurements, Recurring | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 580,046 | 396,744
Fair Value, Measurements, Recurring | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 1,242,465 | 136,992
Fair Value, Measurements, Recurring | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 8,431 | 18,291
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets | 0 | 3,854
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets |  |
Assets |  | 3,854
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Assets |  |
Assets | 0 | 0
Liabilities |  |
Liabilities | 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 | 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 | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | U.S. government agencies securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets | 5,975,878 | 4,882,395
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets |  |
Assets | 27,116 | 54,023
Liabilities |  |
Liabilities | 26,544 | 98,164
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets | 15,747 | 5,509
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 2,284,325 | 3,616,432
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 154,540 | 377,145
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | U.S. government agencies securities |  |
Assets |  |
Assets |  | 20,034
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 9,553 | 63,091
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 2,152 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets | 196,930 | 140,841
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 238,844 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets |  | 20,926
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 1,066,802 | 32,367
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Commercial mortgage-backed securities |  |
Assets |  |
Assets | 148,927 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 580,046 | 396,744
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 1,242,465 | 136,992
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 8,431 | 18,291
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets | 143,064 | 200
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets |  |
Assets | 179 | 200
Liabilities |  |
Liabilities | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 142,885 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | U.S. government agencies securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed residential collateralized mortgage obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed commercial collateralized mortgage obligations |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Commercial mortgage-backed securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets | 5,121 | 76,836
Fair Value, Measurements, Nonrecurring | Loans held for sale – fair value option |  |
Assets |  |
Assets |  | 55,683
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans |  |
Assets |  |
Assets | 5,121 | 21,118
Fair Value, Measurements, Nonrecurring | Other real estate owned |  |
Assets |  |
Assets |  | 35
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets | 0 | 72,934
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets |  | 55,683
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans |  |
Assets |  |
Assets | 0 | 17,251
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets | 5,121 | 3,902
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans |  |
Assets |  |
Assets | $ 5,121 | 3,867
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Assets |  |
Assets |  | $ 35

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