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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 159,569	$ 298,997
Less Than 12 Months, Unrealized Losses	(697)	(4,387)
12 Months or More, Fair Value	45,682	30,592
12 Months or More, Unrealized Losses	(1,521)	(1,327)
Fair Value, Total	205,251	329,589
Unrealized Losses	(2,218)	(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	54,525	87,433
Less Than 12 Months, Unrealized Losses	(279)	(1,330)
12 Months or More, Fair Value	45,682	30,592
12 Months or More, Unrealized Losses	(1,521)	(1,327)
Fair Value, Total	100,207	118,025
Unrealized Losses	(1,800)	(2,657)
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	105,044	201,817
Less Than 12 Months, Unrealized Losses	(418)	(2,872)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Fair Value, Total	105,044	201,817
Unrealized Losses	$ (418)	$ (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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