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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investment securities
Within one year	$ 33,989
After one but within five years	121,112
After five but within ten years	11,846
After ten years	28,871
Available for sale securities	195,818
Mortgage-backed securities	73,005
Total	$ 268,823	$ 269,682

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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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