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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investment securities
Within one year, Amortized Cost	$ 67,777
After one but within five years, Amortized Cost	109,367
After five but within ten years, Amortized Cost	68,813
After ten years, Amortized Cost	71,608
Available for sale securities, Amortized Cost	317,565
Mortgage-backed and other amortizing securities, Amortized Cost	251,068
Available for sale, Amortized Cost	568,633	$ 575,288
Within one year, Fair Value	67,008
After one but within five years, Fair Value	104,142
After five but within ten years, Fair Value	62,794
After ten years, Fair Value	64,181
Available for sale securities, Fair Value	298,125
Mortgage-backed and other amortizing securities, Fair Value	236,396
Available-for-sale, Fair Value, Total	$ 534,521	$ 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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+ 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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