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Disclosures About Fair Value of Financial Instruments - Narrative (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Loans held for sale, average life from purchase to sale | 30 days
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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,157

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