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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, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | $ 4,426,439 | $ 4,886,449
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 33,282 | 76,836
Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value |  | 3,854
Derivative asset | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 38,289 | 54,223
Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 6,074 | 5,509
Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 27,959 | 55,683
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 2,855,284 | 3,616,432
Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 38,756 | 98,164
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 5,323 | 21,118
Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value |  | 35
Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 322,954 | 377,145
Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 20,114 | 20,034
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 10,355 | 63,091
Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 2,205 |
Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 81,758 | 140,841
Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 142,841 | 20,926
Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 23,087 |
Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 162,927 | 32,367
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 350,421 | 396,744
Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 401,576 | 136,992
Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 8,554 | 18,291
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 3,854
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) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value |  | 3,854
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative asset | 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, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
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) | Derivative liabilities | 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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 4,426,138 | 4,882,395
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 27,959 | 72,934
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value |  | 0
Significant Other Observable Inputs (Level 2) | Derivative asset | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 37,988 | 54,023
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 6,074 | 5,509
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 27,959 | 55,683
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 2,855,284 | 3,616,432
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial liabilities, fair value | 38,756 | 98,164
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 0 | 17,251
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value |  | 0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 322,954 | 377,145
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 20,114 | 20,034
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 10,355 | 63,091
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 2,205 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 81,758 | 140,841
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 142,841 | 20,926
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 23,087 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 162,927 | 32,367
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 350,421 | 396,744
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 401,576 | 136,992
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 8,554 | 18,291
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 301 | 200
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value | 5,323 | 3,902
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value |  | 0
Significant Unobservable Inputs (Level 3) | Derivative asset | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 301 | 200
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
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) | Derivative liabilities | 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 | 5,323 | 3,867
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, fair value |  | 35
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 |
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 |
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, fair value | $ 0 | $ 0

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