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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, 2020 | Dec. 31, 2019
--- | --- | ---
Impaired loans, net of reserves |  |
Assets |  |
Impaired loans reserve |  | $ 852
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets | $ 4,886,449 | 2,867,372
Fair Value, Measurements, Recurring | Interest-only GNMA securities |  |
Assets |  |
Assets |  | 16,272
Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Assets | 3,854 | 2,406
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets | 54,223 | 23,608
Liabilities |  |
Liabilities | 98,164 | 45,939
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets | 5,509 | 2,130
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 3,616,432 | 2,245,758
Fair Value, Measurements, Recurring | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 377,145 |
Fair Value, Measurements, Recurring | AFS debt securities | U.S. government agency securities |  |
Assets |  |
Assets | 20,034 |
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed mortgage-backed securities |  |
Assets |  |
Assets | 63,091 | 278,321
Fair Value, Measurements, Recurring | AFS debt securities | Agency-guaranteed collateralized mortgage obligations |  |
Assets |  |
Assets | 161,767 |
Fair Value, Measurements, Recurring | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 32,367 |
Fair Value, Measurements, Recurring | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 396,744 | 298,877
Fair Value, Measurements, Recurring | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 136,992 |
Fair Value, Measurements, Recurring | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 18,291 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets | 3,854 | 2,406
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest-only GNMA securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets |  |
Assets | 3,854 | 2,406
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 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | U.S. government agency securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | AFS debt securities | Agency-guaranteed 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 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 |
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 |
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 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets | 4,882,395 | 2,848,615
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest-only GNMA securities |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets |  |
Assets | 54,023 | 23,529
Liabilities |  |
Liabilities | 98,164 | 45,939
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets | 5,509 | 2,130
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 3,616,432 | 2,245,758
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Asset-backed securities |  |
Assets |  |
Assets | 377,145 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | U.S. government agency securities |  |
Assets |  |
Assets | 20,034 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed mortgage-backed securities |  |
Assets |  |
Assets | 63,091 | 278,321
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Agency-guaranteed collateralized mortgage obligations |  |
Assets |  |
Assets | 161,767 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Collateralized loan obligations |  |
Assets |  |
Assets | 32,367 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Corporate notes |  |
Assets |  |
Assets | 396,744 | 298,877
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | Private label collateralized mortgage obligations |  |
Assets |  |
Assets | 136,992 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 18,291 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets | 200 | 16,351
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest-only GNMA securities |  |
Assets |  |
Assets |  | 16,272
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets |  |
Assets | 200 | 79
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 | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | U.S. government agency securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed mortgage-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Agency-guaranteed collateralized mortgage obligations |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | Collateralized loan obligations |  |
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 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | AFS debt securities | State and political subdivision debt securities |  |
Assets |  |
Assets | 0 |
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets | 76,836 | 14,350
Fair Value, Measurements, Nonrecurring | Loans held for sale – fair value option |  |
Assets |  |
Assets | 55,683 |
Fair Value, Measurements, Nonrecurring | Collateral-dependent loans |  |
Assets |  |
Assets | 21,118 |
Fair Value, Measurements, Nonrecurring | Impaired loans, net of reserves |  |
Assets |  |
Assets |  | 14,272
Fair Value, Measurements, Nonrecurring | Other real estate owned |  |
Assets |  |
Assets | 35 | 78
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 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets | 72,934 | 0
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 | 17,251 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves |  |
Assets |  |
Assets |  | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets | 3,902 | 14,350
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 | 3,867 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves |  |
Assets |  |
Assets |  | 14,272
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Assets |  |
Assets | $ 35 | $ 78

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