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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Within one year	$ 22,544
After one but within five years	104,683
After five but within ten years	29,066
After ten years	76,122
Available for sale securities	232,415
Mortgage-backed securities	66,203
Total	$ 298,618

X

- Definition

Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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