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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 129,605	$ 126,592	$ 130,596	$ 122,874
Gains (Losses) included in earnings	(6,225)	2,255	(7,611)	3,258
Gains (losses) included in OCI		11	(6)	3
Additions	743	2,761	1,244	5,534
Sales	(1,269)		(1,269)
Settlements	460	(47)	360	(97)
Ending Balance	123,314	131,572	123,314	131,572
Changes in unrealized gains (losses) included in earnings relating to assets still held	(2,723)	5,319	(1,430)	9,577
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		9,241		9,241
Gains (Losses) included in earnings		0		0
Gains (losses) included in OCI		0		0
Additions		0		0
Settlements		0		0
Ending Balance		9,241		9,241
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss		0		0
Contingent consideration
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		9,241		9,241
Gains (Losses) included in earnings		0		0
Gains (losses) included in OCI		0		0
Additions		0		0
Settlements		0		0
Ending Balance		9,241		9,241
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss		0		0
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	655	793	711	826
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI		11	(6)	3
Additions	0	0	0	0
Sales	0		0
Settlements	0	(25)	(50)	(50)
Ending Balance	655	779	655	779
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,000	0	1,000	0
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI		0	0	0
Additions	0	500	0	500
Sales	0		0
Settlements	0	0	0	0
Ending Balance	1,000	500	1,000	500
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0	0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	88	174	113	198
Gains (Losses) included in earnings	0	0	0	(1)
Gains (losses) included in OCI		0	0	0
Additions	4	0	4	2
Sales	0		0
Settlements	(36)	(22)	(61)	(47)
Ending Balance	56	152	56	152
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	(1)	0	(1)
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	188		215
Gains (Losses) included in earnings	0		(2)
Gains (losses) included in OCI			0
Additions	0		0
Sales	0		0
Settlements	(25)		(50)
Ending Balance	163		163
Changes in unrealized gains (losses) included in earnings relating to assets still held	0		(1)
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	199	267	207	280
Gains (Losses) included in earnings	(8)	(3)	(16)	(16)
Gains (losses) included in OCI		0	0	0
Additions	0	0	0	0
Sales	0		0
Settlements	0	0	0	0
Ending Balance	191	264	191	264
Changes in unrealized gains (losses) included in earnings relating to assets still held	9	2	18	7
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	127,475	125,358	128,350	121,570
Gains (Losses) included in earnings	(6,217)	2,258	(7,593)	3,275
Gains (losses) included in OCI		0	0	0
Additions	739	2,261	1,240	5,032
Sales	(1,269)		(1,269)
Settlements	521	0	521	0
Ending Balance	121,249	129,877	121,249	129,877
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ (2,732)	$ 5,318	$ (1,447)	$ 9,571

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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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-Publisher FASB
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Amount of unrealized gain (loss) recognized in income from liability 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 gain (loss) recognized in income from liability 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 liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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