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, 2025	Mar. 31, 2024
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 111,054	$ 121,499
Gains (Losses) included in earnings	(3,576)	(3,940)
Gains (losses) included in OCI	(2)	1
Additions	210	294
Settlements	(25)	(33)
Transfers in (out) of Level 3	(1,500)
Ending Balance	106,161	117,821
Changes in unrealized gains (losses) relating to assets still held at reporting date	(1,316)	(1,700)
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	484	606
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	(2)	1
Additions	0	0
Settlements	(25)	0
Transfers in (out) of Level 3	0
Ending Balance	457	607
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	2,250	2,500
Gains (Losses) included in earnings	0	(500)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers in (out) of Level 3	(1,500)
Ending Balance	750	2,000
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	(500)
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance		5
Gains (Losses) included in earnings		0
Gains (losses) included in OCI		0
Additions		0
Settlements		(5)
Ending Balance		0
Changes in unrealized gains (losses) relating to assets still held at reporting date		0
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	84	112
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	(28)
Transfers in (out) of Level 3	0
Ending Balance	84	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	133	167
Gains (Losses) included in earnings	(6)	(1)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Transfers in (out) of Level 3	0
Ending Balance	127	166
Changes in unrealized gains (losses) relating to assets still held at reporting date	9	2
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	108,103	118,109
Gains (Losses) included in earnings	(3,570)	(3,439)
Gains (losses) included in OCI	0	0
Additions	210	294
Settlements	0	0
Transfers in (out) of Level 3	0
Ending Balance	104,743	114,964
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ (1,325)	$ (1,202)

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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 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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