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Investment securities - Maturity Distribution of Debt Securities Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investment securities
Within one year, Amortized Cost	$ 77,671
After one but within five years, Amortized Cost	113,620
After five but within ten years, Amortized Cost	74,776
After ten years, Amortized Cost	59,566
Available for sale securities, Amortized Cost	325,633
Mortgage-backed and other amortizing securities, Amortized Cost	221,076
Available for sale, Amortized Cost	546,709	$ 575,288
Within one year, Fair Value	76,485
After one but within five years, Fair Value	107,609
After five but within ten years, Fair Value	67,002
After ten years, Fair Value	49,950
Available for sale securities, Fair Value	301,046
Mortgage-backed and other amortizing securities, Fair Value	204,135
Available-for-sale, Fair Value, Total	$ 505,181	$ 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
-Paragraph 3
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-Publisher FASB
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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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