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	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 106,161	$ 117,821	$ 111,054	$ 121,499
Gains (Losses) included in earnings	(1,959)	(1,953)	(5,535)	(5,893)
Gains (losses) included in OCI		(1)	(2)
Additions	288	367	498	661
Settlements	(25)	(25)	(50)	(58)
Transfers in (out) of Level 3			(1,500)
Ending Balance	104,465	116,209	104,465	116,209
Changes in unrealized gains (losses) relating to assets still held at reporting date	356	510	(961)	(1,190)
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	457	607	484	606
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI		(1)	(2)
Additions	0	0	0	0
Settlements	(25)	(25)	(50)	(25)
Transfers in (out) of Level 3			0
Ending Balance	432	581	432	581
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	750	2,000	2,250	2,500
Gains (Losses) included in earnings	0	0	0	(500)
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Transfers in (out) of Level 3			(1,500)
Ending Balance	750	2,000	750	2,000
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	(500)
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance		0	0	5
Gains (Losses) included in earnings		0		0
Gains (losses) included in OCI		0
Additions		0		0
Settlements		0		(5)
Ending Balance		0		0
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	84	112
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	0	0	0	(28)
Transfers in (out) of Level 3			0
Ending Balance	84	84	84	84
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	127	166	133	167
Gains (Losses) included in earnings	(5)	(8)	(11)	(9)
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Transfers in (out) of Level 3			0
Ending Balance	122	158	122	158
Changes in unrealized gains (losses) relating to assets still held at reporting date	8	10	16	12
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	104,743	114,964	108,103	118,109
Gains (Losses) included in earnings	(1,954)	(1,945)	(5,524)	(5,384)
Gains (losses) included in OCI		0	0
Additions	288	367	498	661
Settlements	0	0	0	0
Transfers in (out) of Level 3			0
Ending Balance	103,077	113,386	103,077	113,386
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ 348	$ 500	$ (977)	$ (702)

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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 transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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