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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment securities
Within one year	$ 37,800
After one but within five years	79,696
After five but within ten years	18,995
After ten years	39,313
Available for sale securities	175,804
Mortgage-backed securities	127,080
Total	$ 302,884	$ 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 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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