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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investment securities
Within one year, Amortized Cost	$ 75,508
After one but within five years, Amortized Cost	134,695
After five but within ten years, Amortized Cost	75,747
After ten years, Amortized Cost	58,584
Available for sale securities, Amortized Cost	344,534
Mortgage-backed and other amortizing securities, Amortized Cost	201,896
Available for sale, Amortized Cost	546,430	$ 575,288
Within one year, Fair Value	74,327
After one but within five years, Fair Value	127,381
After five but within ten years, Fair Value	67,787
After ten years, Fair Value	48,802
Available for sale securities, Fair Value	318,297
Mortgage-backed and other amortizing securities, Fair Value	184,746
Available-for-sale, Fair Value, Total	$ 503,043	$ 526,329

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- Definition

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
-Topic 320
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-Section 50
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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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