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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) numberOfContracts | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) numberOfContracts | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) numberOfContracts
Investments |  |  |  |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 0 | $ 0 |  | $ 0 | $ 7,476 |
Proceeds from sale of other investments |  |  |  | 13,827 | 7,832 |
Unrealized gain (loss) on investment securities | 200 | 1,300 |  | 100 | 1,000 |
Proceeds from sales of investment securities available for sale | 268,600 | 97,600 |  | 377,767 | 97,555 |
Realized gain | $ 11,700 | $ 1,000 |  | $ 20,000 | $ 1,000 |
Number of available-for-sale investment securities in the less than twelve month category | numberOfContracts | 15 |  |  | 15 |  | 0
Number of available-for-sale investment securities in the twelve month category | numberOfContracts | 0 |  |  | 0 |  | 0
Pledged investment securities fair value | $ 20,100 |  |  | $ 20,100 |  | $ 20,400
Interest-only GNMA securities |  |  |  |  |  |
Investments |  |  |  |  |  |
Loss upon acquisition of interest-only GNMA securities |  |  | $ 7,500 |  |  |
Proceeds from sale of other investments | 15,400 |  |  |  |  |
Realized gain | $ 1,000 |  |  |  |  |

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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=121582814&loc=SL82922888-210455 + Details
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