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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment securities
Within one year	$ 41,834
After one but within five years	37,132
After five but within ten years	37,203
After ten years	93,277
Available for sale securities	209,446
Mortgage-backed and other amortizing securities	127,003
Total	$ 336,449	$ 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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