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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 131,572	$ 121,016	$ 122,874	$ 120,068
Gains (Losses) included in earnings	(509)	(5,988)	2,749	(11,745)
Gains (losses) included in OCI	(18)	(5)	(15)	(6)
Additions	1,666	3,083	7,200	9,916
Settlements	(69)	(84)	(166)	(211)
Ending Balance	132,642	118,022	132,642	118,022
Changes in unrealized gains (losses) included in earnings relating to assets still held	1,990	(1,908)	11,568	1,226
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	779	938	826	1,014
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	(18)	(5)	(15)	(6)
Additions	0	0	0	0
Settlements	(50)	(50)	(100)	(125)
Ending Balance	711	883	711	883
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	500		0
Gains (Losses) included in earnings	0		0
Gains (losses) included in OCI	0		0
Additions	500		1,000
Settlements	0		0
Ending Balance	1,000		1,000
Changes in unrealized gains (losses) included in earnings relating to assets still held	0		0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	152	250	198	278
Gains (Losses) included in earnings	(1)	0	(2)	0
Gains (losses) included in OCI	0	0	0	0
Additions	3	4	5	28
Settlements	(19)	(34)	(66)	(86)
Ending Balance	135	220	135	220
Changes in unrealized gains (losses) included in earnings relating to assets still held	(1)	0	(2)	(1)
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	264	361	280	381
Gains (Losses) included in earnings	(9)	(9)	(25)	(29)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Ending Balance	255	352	255	352
Changes in unrealized gains (losses) included in earnings relating to assets still held	7	4	14	13
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	129,877	119,467	121,570	118,395
Gains (Losses) included in earnings	(499)	(5,979)	2,776	(11,716)
Gains (losses) included in OCI	0	0	0	0
Additions	1,163	3,079	6,195	9,888
Settlements	0	0	0	0
Ending Balance	130,541	116,567	130,541	116,567
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ 1,984	$ (1,912)	$ 11,556	$ 1,214

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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
-Name Accounting Standards Codification
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-Section 50
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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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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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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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