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Disclosures About Fair Value of Financial Instruments - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,078 | $ 17,078 | $ 17,200
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, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Increase in fair value | 600 | 600 |
Settlements | $ 700 | $ 700 |

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