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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investment securities
Within one year	$ 34,156
After one but within five years	76,757
After five but within ten years	19,411
After ten years	40,631
Available for sale securities	170,955
Mortgage-backed securities	116,754
Total	$ 287,709	$ 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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