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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment securities
Within one year, Amortized Cost	$ 77,505
After one but within five years, Amortized Cost	147,076
After five but within ten years, Amortized Cost	74,391
After ten years, Amortized Cost	65,203
Available for sale securities, Amortized Cost	364,175
Mortgage-backed and other amortizing securities, Amortized Cost	211,113
Available for sale, Amortized Cost	575,288	$ 450,454
Within one year, Fair Value	76,127
After one but within five years, Fair Value	137,382
After five but within ten years, Fair Value	67,208
After ten years, Fair Value	54,180
Available for sale securities, Fair Value	334,897
Mortgage-backed and other amortizing securities, Fair Value	191,432
Available-for-sale, Fair Value, Total	$ 526,329	$ 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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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+ References

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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 second through fifth 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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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