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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 82,409	$ 298,997
Less Than 12 Months, Unrealized Losses	(671)	(4,387)
12 Months or More, Fair Value	29,797	30,592
12 Months or More, Unrealized Losses	(1,039)	(1,327)
Fair Value, Total	112,206	329,589
Unrealized Losses	(1,710)	(5,714)
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		9,747
Less Than 12 Months, Unrealized Losses		(185)
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses		0
Fair Value, Total		9,747
Unrealized Losses		(185)
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	76,237	87,433
Less Than 12 Months, Unrealized Losses	(660)	(1,330)
12 Months or More, Fair Value	29,797	30,592
12 Months or More, Unrealized Losses	(1,039)	(1,327)
Fair Value, Total	106,034	118,025
Unrealized Losses	(1,699)	(2,657)
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	6,172	201,817
Less Than 12 Months, Unrealized Losses	(11)	(2,872)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value, Total	6,172	201,817
Unrealized Losses	$ (11)	$ (2,872)

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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