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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Held to maturity
Amortized Cost	$ 53,414	$ 0
Gross Unrealized Gains	82
Gross Unrealized Losses	(193)
Fair Value	53,303
Available for sale
Amortized Cost	486,564	344,878
Gross Unrealized Gains	2,070	1,435
Gross Unrealized Losses	(1,341)	(618)
Fair Value	487,293	345,695
Corporate bonds
Held to maturity
Amortized Cost	53,414
Gross Unrealized Gains	82
Gross Unrealized Losses	(193)
Fair Value	53,303
SBA loan pool securities
Available for sale
Amortized Cost	1,600	1,697
Gross Unrealized Gains	18	18
Gross Unrealized Losses	0	0
Fair Value	1,618	1,715
U.S. government-sponsored entities and agency securities
Available for sale
Amortized Cost	1,946	1,940
Gross Unrealized Gains	54	42
Gross Unrealized Losses	0	0
Fair Value	2,000	1,982
Private label residential mortgage-backed securities
Available for sale
Amortized Cost	2,135	3,169
Gross Unrealized Gains	13	12
Gross Unrealized Losses	(2)	(13)
Fair Value	2,146	3,168
Agency mortgage-backed securities
Available for sale
Amortized Cost	480,883	338,072
Gross Unrealized Gains	1,985	1,363
Gross Unrealized Losses	(1,339)	(605)
Fair Value	$ 481,529	$ 338,830

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