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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Investment securities
Within one year	$ 34,805
After one but within five years	156,767
After five but within ten years	16,149
After ten years	13,063
Available for sale securities	220,784
Mortgage-backed securities	$ 54,010

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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