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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]
Within one year	$ 28,554
After one but within five years	93,270
After five but within ten years	28,180
After ten years	71,903
Available for sale securities	221,907
Mortgage-backed securities	89,875
Total	$ 311,782

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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Fair value of investment in available-for-sale debt securities with a single maturity date.

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