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INVESTMENT SECURITIES - Contractual Maturity Schedule (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost
Within one year	$ 0
One to five years	15,000
Five to ten years	224,675
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	722,607
Amortized Cost	962,282	$ 962,203
Fair Value
Within one year	0
One to five years	14,850
Five to ten years	234,354
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	731,667
Total	980,871	932,285
Amortized Cost
Within one year	0
One to five years	23,000
Five to ten years	32,166
Greater than ten years	5,000
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	1,238,030
Amortized Cost	1,298,196	838,768
Fair Value
Within one year	0
One to five years	23,088
Five to ten years	31,913
Greater than ten years	5,113
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	1,242,671
Total	$ 1,302,785	$ 833,596

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