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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 0	$ 615,410
Less Than 12 Months, Unrealized Losses	0	(30,300)
12 Months or More, Fair Value	138,788	0
12 Months or More, Unrealized Losses	(1,405)	0
Fair Value, Total	138,788	615,410
Unrealized Losses	(1,405)	(30,300)
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	0	305,374
Less Than 12 Months, Unrealized Losses	0	(5,893)
12 Months or More, Fair Value	64,296	0
12 Months or More, Unrealized Losses	(2)	0
Fair Value, Total	64,296	305,374
Unrealized Losses	(2)	(5,893)
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	0	310,036
Less Than 12 Months, Unrealized Losses	0	(24,407)
12 Months or More, Fair Value	74,492	0
12 Months or More, Unrealized Losses	(1,403)	0
Fair Value, Total	74,492	310,036
Unrealized Losses	$ (1,403)	$ (24,407)

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- Definition

Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value

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+ References

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