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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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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.

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