Fair value measurement - Schedule of 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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 95,545	$ 106,161	$ 97,694	$ 111,054
Gains (losses) included in earnings	(239)	(1,959)	(2,880)	(5,535)
Gains (losses) included in OCI		0	2	2
Additions	485	288	1,000	498
Settlements	(254)	(25)	(279)	(50)
Transfers out of Level 3				(1,500)
Ending balance	95,537	104,465	95,537	104,465
Changes in unrealized gains (losses) relating to assets still held at reporting date	2,005	356	1,551	(961)
Debt securities available-for-sale \| MBS classified as debt securities available- for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	383	457	405	484
Gains (losses) included in earnings	(1)	0	0	0
Gains (losses) included in OCI		0	2	(2)
Additions	0	0	0	0
Settlements	(25)	(25)	(50)	(50)
Transfers out of Level 3				0
Ending balance	357	432	357	432
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Debt securities available-for-sale \| Other securities classified as debt securities available- for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	750	750	750	2,250
Gains (losses) included in earnings	0	0	0	0
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	(229)	0	(229)	0
Transfers out of Level 3				(1,500)
Ending balance	521	750	521	750
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Trading account debt securities: \| CMOs classified as trading account debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance				0
Gains (losses) included in earnings				0
Gains (losses) included in OCI
Additions				0
Settlements				0
Transfers out of Level 3				0
Ending balance		0		0
Changes in unrealized gains (losses) relating to assets still held at reporting date				0
Trading account debt securities: \| MBS classified as debt securities available- for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	85	84	84	84
Gains (losses) included in earnings	0	0	1	0
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Transfers out of Level 3				0
Ending balance	85	84	85	84
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	1	0
Trading account debt securities: \| Other securities classified as debt securities available- for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	95	127	99	133
Gains (losses) included in earnings	(6)	(5)	(10)	(11)
Gains (losses) included in OCI		0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Transfers out of Level 3				0
Ending balance	89	122	89	122
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	8	18	16
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	94,232	104,743	96,356	108,103
Gains (losses) included in earnings	(232)	(1,954)	(2,871)	(5,524)
Gains (losses) included in OCI		0	0
Additions	485	288	1,000	498
Settlements	0	0	0	0
Transfers out of Level 3				0
Ending balance	94,485	103,077	94,485	103,077
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ 2,005	$ 348	$ 1,532	$ (977)

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

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Fair value 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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