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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,001,421	$ 497,869
Gross Unrealized Gains	12,894	1,319
Gross Unrealized Losses	(1,710)	(5,714)
Fair value	1,012,605	493,474
Corporate notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,956	44,932
Gross Unrealized Gains	821	401
Gross Unrealized Losses	0	(185)
Fair value	45,777	45,148
Agency-guaranteed residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	210,688	233,002
Gross Unrealized Gains	755	918
Gross Unrealized Losses	(1,699)	(2,657)
Fair value	209,744	231,263
Agency-guaranteed commercial real estate mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	735,116	204,689
Gross Unrealized Gains	11,318	0
Gross Unrealized Losses	(11)	(2,872)
Fair value	746,423	201,817
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,661	15,246
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair value	$ 10,661	$ 15,246

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
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