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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 | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | $ 5,024,100 | $ 6,118,942
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 4,920 | 5,121
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 219,721 | 297,425
Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 9,553
Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 2,152
Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 147,120 | 196,930
Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 238,844
Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 950,568 | 1,066,802
Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 135,784 | 148,927
Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 545,844 | 580,046
Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 1,113,337 | 1,242,465
State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 7,737 | 8,431
Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 27,434 | 27,295
Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 1,952 | 15,747
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 1,874,603 | 2,284,325
Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 24,922 | 26,544
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 4,920 | 5,121
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 commercial 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) | State and political subdivision debt securities | 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) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 4,917,083 | 5,975,878
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 | 112,802 | 154,540
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 9,553
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 2,152
Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 147,120 | 196,930
Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value |  | 238,844
Significant Other Observable Inputs (Level 2) | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 950,568 | 1,066,802
Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 135,784 | 148,927
Significant Other Observable Inputs (Level 2) | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 545,844 | 580,046
Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 1,113,337 | 1,242,465
Significant Other Observable Inputs (Level 2) | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 7,737 | 8,431
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 27,336 | 27,116
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 1,952 | 15,747
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 1,874,603 | 2,284,325
Significant Other Observable Inputs (Level 2) | Derivatives | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 24,922 | 26,544
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 107,017 | 143,064
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 4,920 | 5,121
Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets |  |
Fair Value | 106,919 | 142,885
Significant Unobservable Inputs (Level 3) | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 106,919 | 142,885
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 commercial 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) | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 98 | 179
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 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 | $ 4,920 | $ 5,121

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