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INVESTMENT SECURITIES - Contractual Maturity Schedule (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized Cost
Within one year	$ 0
One to five years	0
Five to ten years	212,219
Greater than ten years	27,055
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	722,929
Amortized Cost	962,203	$ 0
Fair Value
Within one year	0
One to five years	0
Five to ten years	193,080
Greater than ten years	25,503
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	713,702
Total	932,285	0
Amortized Cost
Within one year	0
One to five years	0
Five to ten years	26,657
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	812,111
Amortized Cost	838,768	344,878
Fair Value
Within one year	0
One to five years	0
Five to ten years	26,152
Greater than ten years	0
Collateralized loan obligations, SBA loan pool, private label residential mortgage-backed, commercial mortgage-backed, and agency mortgage-backed securities	807,444
Total	$ 833,596	$ 345,695

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