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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 | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Related Allowance | $ 303 | $ 845
Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,736,950 | 2,086,632
Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 12,457 | 11,497
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 17,157 |
Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 1,373 |
Derivative assets | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 22,679 | 14,693
Loans held for sale - fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,372 | 1,507
Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,001,540 | 1,405,420
Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 46,636 | 16,286
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 11,577 | 10,876
Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 880 | 621
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 301,391 | 305,374
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 388,438 | 357,920
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure |  | 1,718
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 1,373 | 1,718
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 classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | 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 | 1,373 |
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 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 | 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 | 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 |  | 1,718
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,718,275 | 2,084,845
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 classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | 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 | 22,534 | 14,624
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 4,372 | 1,507
Significant Other Observable Inputs (Level 2) | Loans receivable, mortgage warehouse – fair value option | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 2,001,540 | 1,405,420
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 46,636 | 16,286
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 | 0
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 | 301,391 | 305,374
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 388,438 | 357,920
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 | 17,302 | 69
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 12,457 | 11,497
Significant Unobservable Inputs (Level 3) | Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | Fair Value, Measurements, Recurring |  |
Assets |  |
Assets, Fair Value Disclosure | 17,157 |
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 | 145 | 69
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 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 | 11,577 | 10,876
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring |  |
Assets |  |
Assets, Fair Value Disclosure | 880 | 621
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 | 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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