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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investment securities
Within one year	$ 38,267
After one but within five years	62,060
After five but within ten years	18,900
After ten years	41,142
Available for sale securities	160,369
Mortgage-backed securities	87,035
Total	$ 247,404	$ 330,478

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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 current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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