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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investment securities
Within one year	$ 18,608
After one but within five years	204,991
After five but within ten years	74,710
After ten years	84,516
Available for sale securities	382,825
Mortgage-backed and other amortizing securities	94,765
Total	$ 477,590	$ 517,321

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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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