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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, 2018 | Dec. 31, 2017
--- | --- | ---
Measured at Fair Value on a Nonrecurring Basis: |  |
Impaired loans reserve | $ 845 | $ 1,451
Impaired loans, net of reserves |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Impaired loans reserve | 845 | 1,451
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,086,632 | 2,276,417
Fair Value, Measurements, Recurring | Derivatives |  |
Assets |  |
Assets, Fair Value Disclosure | 14,693 | 9,752
Measured at Fair Value on a Nonrecurring Basis: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 16,286 | 10,074
Fair Value, Measurements, Recurring | Loans held for sale – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 1,507 | 1,886
Fair Value, Measurements, Recurring | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 1,405,420 | 1,793,408
Fair Value, Measurements, Recurring | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure | 305,374 | 183,458
Fair Value, Measurements, Recurring | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure |  | 238,472
Fair Value, Measurements, Recurring | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets, Fair Value Disclosure | 357,920 | 46,089
Fair Value, Measurements, Recurring | Available-for-sale Securities | Equity securities |  |
Assets |  |
Assets, Fair Value Disclosure | 1,718 | 3,352
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets, Fair Value Disclosure | 1,718 | 3,352
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Measured at Fair Value on a Nonrecurring Basis: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 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, Fair Value Disclosure | 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, Fair Value Disclosure | 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, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities |  |
Assets |  |
Assets, Fair Value Disclosure | 1,718 | 3,352
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets, Fair Value Disclosure | 2,084,845 | 2,273,005
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets |  |
Assets, Fair Value Disclosure | 14,624 | 9,692
Measured at Fair Value on a Nonrecurring Basis: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 16,286 | 10,074
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 1,507 | 1,886
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 1,405,420 | 1,793,408
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure | 305,374 | 183,458
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure |  | 238,472
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets, Fair Value Disclosure | 357,920 | 46,089
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets, Fair Value Disclosure | 69 | 60
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets |  |
Assets, Fair Value Disclosure | 69 | 60
Measured at Fair Value on a Nonrecurring Basis: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Loans receivable, mortgage warehouse – fair value option |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 11,497 | 15,351
Fair Value, Measurements, Nonrecurring | Impaired loans, net of reserves |  |
Assets |  |
Assets, Fair Value Disclosure | 10,876 | 13,902
Fair Value, Measurements, Nonrecurring | Other real estate owned |  |
Assets |  |
Assets, Fair Value Disclosure | 621 | 1,449
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Other real estate owned |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Assets, Fair Value Disclosure | 11,497 | 15,351
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves |  |
Assets |  |
Assets, Fair Value Disclosure | 10,876 | 13,902
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Assets |  |
Assets, Fair Value Disclosure | $ 621 | $ 1,449

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