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	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 123,314	$ 131,572	$ 130,596	$ 122,874
Gains (Losses) included in earnings	(2,796)	(509)	(10,407)	2,749
Gains (losses) included in OCI	(2)	(18)	(8)	(15)
Additions	574	1,666	1,818	7,200
Sales			(1,269)
Settlements	(72)	(69)	288	(166)
Ending Balance	121,018	132,642	121,018	132,642
Changes in unrealized gains (losses) included in earnings relating to assets still held	(377)	1,990	(1,807)	11,568
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance		(9,241)		(9,241)
Gains (Losses) included in earnings		9,241		9,241
Gains (losses) included in OCI		0		0
Additions		0		0
Settlements		0		0
Ending Balance		0		0
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		9,241		9,241
Gains (losses) included in OCI		0		0
Additions		0		0
Settlements		0		0
Ending Balance		0		0
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	779	711	826
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	(2)	(18)	(8)	(15)
Additions	0	0	0	0
Sales			0
Settlements	0	(50)	(50)	(100)
Ending Balance	653	711	653	711
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	500	1,000	0
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	0	0	0	0
Additions	0	500	0	1,000
Sales			0
Settlements	0	0	0	0
Ending Balance	1,000	1,000	1,000	1,000
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	56	152	113	198
Gains (Losses) included in earnings	0	(1)	0	(2)
Gains (losses) included in OCI	0	0	0	0
Additions	0	3	4	5
Sales			0
Settlements	(46)	(19)	(107)	(66)
Ending Balance	10	135	10	135
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	(1)	0	(2)
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	163		215
Gains (Losses) included in earnings	0		(2)
Gains (losses) included in OCI	0		0
Additions	0		0
Sales			0
Settlements	(26)		(76)
Ending Balance	137		137
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	191	264	207	280
Gains (Losses) included in earnings	(3)	(9)	(19)	(25)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales			0
Settlements	0	0	0	0
Ending Balance	188	255	188	255
Changes in unrealized gains (losses) included in earnings relating to assets still held	4	7	22	14
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	121,249	129,877	128,350	121,570
Gains (Losses) included in earnings	(2,793)	(499)	(10,386)	2,776
Gains (losses) included in OCI	0	0	0	0
Additions	574	1,163	1,814	6,195
Sales			(1,269)
Settlements	0	0	521	0
Ending Balance	119,030	130,541	119,030	130,541
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ (381)	$ 1,984	$ (1,828)	$ 11,556

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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 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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