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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Held to maturity
Amortized Cost	$ 529,532	$ 0
Gross Unrealized Gains	930
Gross Unrealized Losses	(3,504)
Fair Value	526,958
Available for sale
Amortized Cost	690,543	344,878
Gross Unrealized Gains	3,255	1,435
Gross Unrealized Losses	(579)	(618)
Fair Value	693,219	345,695
SBA loan pool securities
Available for sale
Amortized Cost	1,485	1,697
Gross Unrealized Gains	31	18
Gross Unrealized Losses	0	0
Fair Value	1,516	1,715
U.S. government-sponsored entities and agency securities
Available for sale
Amortized Cost	1,949	1,940
Gross Unrealized Gains	52	42
Gross Unrealized Losses	0	0
Fair Value	2,001	1,982
Private label residential mortgage-backed securities
Available for sale
Amortized Cost	1,904	3,169
Gross Unrealized Gains	15	12
Gross Unrealized Losses	(2)	(13)
Fair Value	1,917	3,168
Corporate bonds
Held to maturity
Amortized Cost	239,079
Gross Unrealized Gains	875
Gross Unrealized Losses	(2,919)
Fair Value	237,035
Available for sale
Amortized Cost	26,662
Gross Unrealized Gains	0
Gross Unrealized Losses	(415)
Fair Value	26,247
Commercial mortgage-backed securities
Available for sale
Amortized Cost	114,361
Gross Unrealized Gains	904
Gross Unrealized Losses	(31)
Fair Value	115,234
Collateralized loan obligations
Held to maturity
Amortized Cost	290,453
Gross Unrealized Gains	55
Gross Unrealized Losses	(585)
Fair Value	289,923
Agency mortgage-backed securities
Available for sale
Amortized Cost	544,182	338,072
Gross Unrealized Gains	2,253	1,363
Gross Unrealized Losses	(131)	(605)
Fair Value	$ 546,304	$ 338,830

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