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INVESTMENT SECURITIES - Contractual Maturity Schedule (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized Cost
Within one year	$ 0
One to five years	0
Five to ten years	239,479
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	722,783
Amortized Cost	962,262	$ 962,203
Fair Value
Within one year	0
One to five years	0
Five to ten years	231,705
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	716,753
Total	948,458	932,285
Amortized Cost
Within one year	0
One to five years	0
Five to ten years	26,653
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	1,632,210
Amortized Cost	1,658,863	838,768
Fair Value
Within one year	0
One to five years	0
Five to ten years	26,177
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	1,637,534
Total	$ 1,663,711	$ 833,596

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