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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 573,492		$ 692,674
Gross Unrealized Gains	16,049		920
Gross Unrealized Losses	0		(30,300)
Fair Value	589,541		663,294
Equity securities, at fair value	2,095		1,718
Investment securities, at fair value	608,714		665,012
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	288,829		311,267
Gross Unrealized Gains	3,514		0
Gross Unrealized Losses	0		(5,893)
Fair Value	292,343		305,374
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	284,663		381,407
Gross Unrealized Gains	12,535		920
Gross Unrealized Losses	0		(24,407)
Fair Value	297,198		$ 357,920
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election
Debt Securities, Available-for-sale [Line Items]
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities	$ 17,078	$ 17,200

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Investment Securities, at Fair Value, including available-for-sale debt securities, and equity securities presented under ASU 2016-01.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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