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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, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities |  |
Specific reserves related to impaired loans | $ 1,381 | $ 1,451
Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 3,109,028 | 2,276,417
Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 12,956 | 15,351
Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 3,056 |
Derivative assets | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 16,247 | 9,752
Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,931,781 | 1,795,294
Derivative liabilities | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 13,698 | 10,074
Impaired loans, net of specific reserves |  |
Liabilities |  |
Specific reserves related to impaired loans | 1,381 | 1,451
Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 11,929 | 13,902
Other real estate owned | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,027 | 1,449
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 476,563 | 183,458
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 320,373 | 238,472
Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 361,008 | 46,089
Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure |  | 3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 3,056 | 3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 3,056 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets | Fair Value, Measurements, Recurring [Member] |  |
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 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities | Fair Value, Measurements, Recurring [Member] |  |
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 [Member] |  |
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 [Member] |  |
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 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
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 [Member] |  |
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 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure |  | 3,352
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 3,105,839 | 2,273,005
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Other Observable Inputs (Level 2) | Derivative assets | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 16,114 | 9,692
Significant Other Observable Inputs (Level 2) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,931,781 | 1,795,294
Significant Other Observable Inputs (Level 2) | Derivative liabilities | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 13,698 | 10,074
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring [Member] |  |
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 [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 476,563 | 183,458
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 320,373 | 238,472
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 361,008 | 46,089
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure |  | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 133 | 60
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 12,956 | 15,351
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 |
Significant Unobservable Inputs (Level 3) | Derivative assets | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 133 | 60
Significant Unobservable Inputs (Level 3) | Loans held for sale - fair value option | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivative liabilities | Fair Value, Measurements, Recurring [Member] |  |
Liabilities |  |
Financial Liabilities Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 11,929 | 13,902
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 1,027 | 1,449
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Assets, Fair Value Disclosure |  | $ 0

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