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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 | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | $ 4,887,233 | $ 4,886,449
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 51,624 | 76,836
Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,827 |
Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 36,502 | 54,223
Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 1,205 | 5,509
Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 44,258 | 55,683
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 3,407,622 | 3,616,432
Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 37,536 | 98,164
Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 7,331 | 21,118
Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 35 | 35
Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 386,993 | 377,145
Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 20,053 | 20,034
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 37,634 | 63,091
Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 211,104 | 161,767
Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 13,059 |
Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 163,094 | 32,367
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 257,924 | 396,744
Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 328,689 | 136,992
Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 18,527 | 18,291
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 3,854
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,827 | 3,854
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,827 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 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 Disclosure | 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 Disclosure | 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 Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 Disclosure | 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 Disclosure | 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 Disclosure | 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 Disclosure | 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 Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 3,854
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,882,210 | 4,882,395
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 44,258 | 72,934
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Other Observable Inputs (Level 2) | Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 36,306 | 54,023
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 1,205 | 5,509
Significant Other Observable Inputs (Level 2) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 44,258 | 55,683
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 3,407,622 | 3,616,432
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 37,536 | 98,164
Significant Other Observable Inputs (Level 2) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 17,251
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 386,993 | 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 Disclosure | 20,053 | 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 Disclosure | 37,634 | 63,091
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 211,104 | 161,767
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 13,059 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 163,094 | 32,367
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 257,924 | 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 Disclosure | 328,689 | 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 Disclosure | 18,527 | 18,291
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 196 | 200
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 7,366 | 3,902
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Unobservable Inputs (Level 3) | Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 196 | 200
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Loans held for sale | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Collateral-dependent loans | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 7,331 | 3,867
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 35 | 35
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Commercial mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Collateralized loan obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 Disclosure | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | $ 0

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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