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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 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | $ 3,070,782 | $ 2,276,417
Assets |  |
Assets measured at fair value on a nonrecurring basis | 13,996 | 15,351
Specific reserves related to impaired loans | 2,119 | 1,451
Derivative assets |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 13,606 | 9,752
Loans held for sale – fair value option |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 1,875,515 | 1,795,294
Derivative liabilities |  |
Liabilities |  |
Derivatives | 12,673 | 10,074
Impaired loans, net of specific reserves |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 12,588 | 13,902
Specific reserves related to impaired loans | 2,119 | 1,451
Other real estate owned |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 1,408 | 1,449
Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 3,362 |
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 493,257 | 183,458
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 324,534 | 238,472
Available-for-sale Securities | Corporate notes |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 360,508 | 46,089
Available-for-sale Securities | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis |  | 3,352
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 3,362 | 3,352
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative assets |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liabilities |  |
Liabilities |  |
Derivatives | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of specific reserves |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 3,362 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis |  | 3,352
Significant Other Observable Inputs (Level 2) |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 3,067,337 | 2,273,005
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) | Derivative assets |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 13,523 | 9,692
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 1,875,515 | 1,795,294
Significant Other Observable Inputs (Level 2) | Derivative liabilities |  |
Liabilities |  |
Derivatives | 12,673 | 10,074
Significant Other Observable Inputs (Level 2) | Impaired loans, net of specific reserves |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) | Other real estate owned |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 0 | 0
Significant Other Observable Inputs (Level 2) | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 |
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 493,257 | 183,458
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 324,534 | 238,472
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 360,508 | 46,089
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis |  | 0
Significant Unobservable Inputs (Level 3) |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 83 | 60
Assets |  |
Assets measured at fair value on a nonrecurring basis | 13,996 | 15,351
Significant Unobservable Inputs (Level 3) | Derivative assets |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 83 | 60
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivative liabilities |  |
Liabilities |  |
Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of specific reserves |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 12,588 | 13,902
Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Assets |  |
Assets measured at fair value on a nonrecurring basis | 1,408 | 1,449
Significant Unobservable Inputs (Level 3) | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 |
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities |  |
Available-for-sale securities: |  |
Assets measured at fair value on a recurring basis |  | $ 0

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