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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities held-to-maturity:
Amortized Cost	$ 0	$ 884,234
Gross Unrealized Gains		17,442
Gross Unrealized Losses		(1,933)
Fair Value		899,743
Securities available-for-sale:
Amortized Cost	2,899,899	2,396,968
Gross Unrealized Gains	33,863	12,958
Gross Unrealized Losses	(18,659)	(28,438)
Fair Value	2,915,103	2,381,488
SBA loan pool securities
Securities available-for-sale:
Amortized Cost	1,138	1,221
Gross Unrealized Gains	11	0
Gross Unrealized Losses	0	0
Fair Value	1,149	1,221
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	513,698	830,682
Gross Unrealized Gains	9	9
Gross Unrealized Losses	(16,902)	(23,418)
Fair Value	496,805	807,273
Non-agency residential mortgage-backed securities
Securities available-for-sale:
Amortized Cost	936	121,397
Gross Unrealized Gains	17	18
Gross Unrealized Losses	(2)	(4,238)
Fair Value	951	117,177
Non-agency commercial mortgage-backed securities
Securities available-for-sale:
Amortized Cost	305,552
Gross Unrealized Gains	5,287
Gross Unrealized Losses	(721)
Fair Value	310,118
Collateralized loan obligations
Securities available-for-sale:
Amortized Cost	1,836,302	1,395,094
Gross Unrealized Gains	12,062	12,449
Gross Unrealized Losses	(994)	(674)
Fair Value	1,847,370	1,406,869
Corporate debt securities
Securities available-for-sale:
Amortized Cost	242,273	48,574
Gross Unrealized Gains	16,477	482
Gross Unrealized Losses	(40)	(108)
Fair Value	$ 258,710	48,948
Non-agency commercial mortgage-backed securities
Securities held-to-maturity:
Amortized Cost		305,918
Gross Unrealized Gains		2,949
Gross Unrealized Losses		(1,781)
Fair Value		307,086
Collateralized loan obligations
Securities held-to-maturity:
Amortized Cost		338,226
Gross Unrealized Gains		1,461
Gross Unrealized Losses		(61)
Fair Value		339,626
Corporate debt securities
Securities held-to-maturity:
Amortized Cost		240,090
Gross Unrealized Gains		13,032
Gross Unrealized Losses		(91)
Fair Value		$ 253,031

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