Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities Portfolio (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale Maturities, Amortized Cost
Within one year, Amortized Cost
One to five years, Amortized Cost
Five to ten years, Amortized Cost	1,930
Greater than ten years
SBA loan pools, private label residential mortgage backed and agency mortgage-backed securities	106,566
Amortized Cost, Total	108,496
Available-for-sale Maturities, Fair Value
Within one year, Fair Value
One to five years, Fair Value
Five to ten years, Fair Value	1,958
Greater than ten years
SBA loan pools, private label residential mortgage backed and agency mortgage-backed securities	105,567
Fair value, Total	$ 107,525	$ 170,022

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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