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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) derivative | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) derivative | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Investment [Line Items] |  |  |  |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 0 | $ 0 | $ 7,476 | $ 0 |  |
Unrealized gain (loss) on investment securities | $ 1,300 | $ (1,200) | $ 1,000 | $ (1,500) |  |
Number of available-for-sale investment securities in the less than twelve month category | derivative | 0 |  | 0 |  |  |
Number of available-for-sale investment securities in the twelve month category | derivative | 0 |  | 0 |  |  |
Pledged investment securities fair value | $ 21,800 |  | $ 21,800 |  |  | $ 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 |  |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,078 |  | $ 17,078 |  | $ 17,200 |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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