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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) Security | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Security | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Investment [Line Items] |  |  |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 7,476 | $ 0 | $ 7,476 | $ 0 |
Number of available-for-sale investment securities in the less than twelve month category | Security | 0 |  | 0 |  |
Number of available-for-sale investment securities in the twelve month category | Security | 7 |  | 7 |  |
Pledged investment securities fair value | $ 22,600 |  | $ 22,600 |  | $ 23,000
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Loss upon acquisition of interest-only GNMA securities | 7,500 |  | 7,500 |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,157 |  | $ 17,157 |  |

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