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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Investment securities
Within one year	$ 43,852
After one but within five years	171,504
After five but within ten years	53,729
After ten years	70,645
Available for sale securities, Amortized Cost	339,730
Mortgage-backed and other amortizing securities	99,459
Available-for-sale, Amortized Cost	439,189	$ 450,454
Within one year	42,651
After one but within five years	158,031
After five but within ten years	46,189
After ten years	58,705
Available for sale securities, Fair Value	305,576
Mortgage-backed and other amortizing securities	79,664
Total	$ 385,240	$ 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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