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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment securities
Within one year	$ 37,351
After one but within five years	49,444
After five but within ten years	22,799
After ten years	84,357
Available for sale securities	193,951
Mortgage-backed and other amortizing securities	101,960
Total	$ 295,911	$ 330,478

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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 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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