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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, 2017 | Dec. 31, 2016
--- | --- | ---
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | $ 2,276,417 | $ 2,621,848
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 15,351 | 9,258
Impaired loans reserve | 1,451 | 1,360
Derivatives |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 9,752 | 10,864
Liabilities, recurring fair value measurements | 10,074 | 14,172
Loans held for sale – fair value option |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 1,795,294 | 2,117,510
Impaired loans, net of reserves |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 13,902 | 6,527
Impaired loans reserve | 1,451 | 2,273
Other real estate owned |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 1,449 | 2,731
Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 183,458 | 231,263
Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 238,472 | 201,817
Available-for-sale Securities | Corporate notes |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 46,089 | 45,148
Available-for-sale Securities | Equity securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 3,352 | 15,246
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 3,352 | 15,246
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Liabilities, recurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale – fair value option |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans, net of reserves |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Corporate notes |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Available-for-sale Securities | Equity securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 3,352 | 15,246
Significant Other Observable Inputs (Level 2) |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 2,273,005 | 2,606,557
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Significant Other Observable Inputs (Level 2) | Derivatives |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 9,692 | 10,819
Liabilities, recurring fair value measurements | 10,074 | 14,172
Significant Other Observable Inputs (Level 2) | Loans held for sale – fair value option |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 1,795,294 | 2,117,510
Significant Other Observable Inputs (Level 2) | Impaired loans, net of reserves |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Significant Other Observable Inputs (Level 2) | Other real estate owned |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 0 | 0
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 183,458 | 231,263
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 238,472 | 201,817
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Corporate notes |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 46,089 | 45,148
Significant Other Observable Inputs (Level 2) | Available-for-sale Securities | Equity securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 60 | 45
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 15,351 | 9,258
Significant Unobservable Inputs (Level 3) | Derivatives |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 60 | 45
Liabilities, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) | Loans held for sale – fair value option |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) | Impaired loans, net of reserves |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 13,902 | 6,527
Significant Unobservable Inputs (Level 3) | Other real estate owned |  |
Measured at Fair Value on a Nonrecurring Basis: |  |
Assets, nonrecurring fair value measurements | 1,449 | 2,731
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed residential mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Agency-guaranteed commercial real estate mortgage-backed securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Corporate notes |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | 0 | 0
Significant Unobservable Inputs (Level 3) | Available-for-sale Securities | Equity securities |  |
Measured at Fair Value on a Recurring Basis: |  |
Assets, recurring fair value measurements | $ 0 | $ 0

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