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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | $ 5,115,232 | $ 2,867,372
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 40,905 | 14,350
Interest-only GNMA securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 16,272
Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,466 |
Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 60,810 | 23,608
Loans held for sale - fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 6,998 | 2,130
Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 18,366 |
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 3,913,593 | 2,245,758
Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 110,649 | 45,939
Impaired loans, net of specific reserves |  |
Assets |  |
Related Allowance |  | 852
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 22,539 | 14,272
Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 78
Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 375,381 |
Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 40,008 |
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 61,079 | 278,321
Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 153,779 |
Available-for-sale Securities | State and political subdivision debt securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 18,259 |
Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 118,987 |
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 363,872 | 298,877
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 2,406
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,466 | 2,406
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) | Interest-only GNMA securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,466 |
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 option | 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 option | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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) | Impaired loans, net of specific reserves | 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
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 |
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 |
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 |
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 |
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 |
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 | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 2,406
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 5,112,311 | 2,848,615
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Interest-only GNMA securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
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 | 60,355 | 23,529
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 6,998 | 2,130
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 3,913,593 | 2,245,758
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 110,649 | 45,939
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 375,381 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | U.S. government agencies securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 40,008 |
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 | 61,079 | 278,321
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 153,779 |
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 | 18,259 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 118,987 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 363,872 | 298,877
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 | 455 | 16,351
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 40,905 | 14,350
Significant Unobservable Inputs (Level 3) | Interest-only GNMA securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 16,272
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 | 455 | 79
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 18,366 |
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) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 22,539 | 14,272
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 78
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Asset-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 |
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 |
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 |
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Private label collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 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 | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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