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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment securities
Within one year	$ 39,394
After one but within five years	41,919
After five but within ten years	25,997
After ten years	95,819
Available for sale securities	203,129
Mortgage-backed and other amortizing securities	130,624
Total	$ 333,753	$ 295,911

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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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