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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Impaired loans reserve | $ 852 | $ 845
Impaired loans, net of reserves |  |
Assets |  |
Impaired loans reserve | 852 | 845
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets | 2,867,372 | 2,086,632
Fair Value, Measurements, Recurring | Interest-only GNMA securities |  |
Assets |  |
Assets | 16,272 |
Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Assets | 2,406 | 1,718
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets | 23,608 | 14,693
Liabilities |  |
Liabilities | 45,939 | 16,286
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets | 2,130 | 1,507
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 2,245,758 | 1,405,420
Fair Value, Measurements, Recurring | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 278,321 | 305,374
Fair Value, Measurements, Recurring | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets | 298,877 | 357,920
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets | 2,406 | 1,718
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 | 2,406 | 1,718
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) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets | 2,848,615 | 2,084,845
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 | 23,529 | 14,624
Liabilities |  |
Liabilities | 45,939 | 16,286
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets | 2,130 | 1,507
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets | 2,245,758 | 1,405,420
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 278,321 | 305,374
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets | 298,877 | 357,920
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets | 16,351 | 69
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 | 79 | 69
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) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets | 0 | 0
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets | 14,350 | 11,497
Fair Value, Measurements, Nonrecurring | Impaired loans, net of reserves |  |
Assets |  |
Assets | 14,272 | 10,876
Fair Value, Measurements, Nonrecurring | Other real estate owned |  |
Assets |  |
Assets | 78 | 621
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) | Impaired loans, net of reserves |  |
Assets |  |
Assets | 0 | 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 | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves |  |
Assets |  |
Assets | 0 | 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 | 14,350 | 11,497
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves |  |
Assets |  |
Assets | 14,272 | 10,876
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Assets |  |
Assets | $ 78 | $ 621

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