Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 97,694	$ 111,054
Gains (Losses) included in earnings	(2,642)	(3,576)
Gains (losses) included in OCI	3	(2)
Additions	515	210
Settlements	(25)	(25)
Transfers out of Level 3		(1,500)
Ending Balance	95,545	106,161
Changes in unrealized gains (losses) relating to assets still held at reporting date	(472)	(1,316)
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	405	484
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	3	(2)
Additions	0	0
Settlements	(25)	(25)
Transfers out of Level 3		0
Ending Balance	383	457
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	750	2,250
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers out of Level 3		(1,500)
Ending Balance	750	750
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	84	84
Gains (Losses) included in earnings	1	0
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers out of Level 3		0
Ending Balance	85	84
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	99	133
Gains (Losses) included in earnings	(4)	(6)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers out of Level 3		0
Ending Balance	95	127
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	9
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	96,356	108,103
Gains (Losses) included in earnings	(2,639)	(3,570)
Gains (losses) included in OCI	0	0
Additions	515	210
Settlements	0	0
Transfers out of Level 3		0
Ending Balance	94,232	104,743
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ (472)	$ (1,325)

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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