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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investment securities
Within one year	$ 19,709
After one but within five years	205,581
After five but within ten years	95,545
After ten years	101,618
Available for sale securities	422,453
Mortgage-backed and other amortizing securities	113,029
Total	$ 535,482	$ 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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