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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investment securities
Within one year	$ 34,591
After one but within five years	183,827
After five but within ten years	53,597
After ten years	73,329
Available for sale securities, Amortized Cost	345,344
Mortgage-backed and other amortizing securities	103,037
Available-for-sale, Amortized Cost	448,381	$ 450,454
Within one year	33,607
After one but within five years	169,269
After five but within ten years	46,456
After ten years	61,782
Available for sale securities, Fair Value	311,114
Mortgage-backed and other amortizing securities	83,299
Total	$ 394,413	$ 398,927

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Amortized cost 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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