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
Mar. 31, 2022	Mar. 31, 2021
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 122,874	$ 120,068
Gains (Losses) included in earnings	1,003	503
Gains (losses) included in OCI	(8)	(5)
Additions	2,773	3,637
Settlements	(50)	(103)
Ending Balance	126,592	124,100
Changes in unrealized gains (losses) included in earnings relating to assets still held	4,256	5,166
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(9,241)
Gains (Losses) included in earnings	0
Gains (losses) included in OCI	0
Additions	0
Settlements	0
Ending Balance	(9,241)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	0
Contingent consideration
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(9,241)
Gains (Losses) included in earnings	0
Gains (losses) included in OCI	0
Additions	0
Settlements	0
Ending Balance	(9,241)
Fair Value Liabilities Measured On Recurring Basis Change In Unrealized Gain Loss	0
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	826	1,014
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	(8)	(5)
Additions	0	0
Settlements	(25)	(75)
Ending Balance	793	934
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	198	278
Gains (Losses) included in earnings	(1)	0
Gains (losses) included in OCI	0	0
Additions	2	1
Settlements	(25)	(28)
Ending Balance	174	251
Changes in unrealized gains (losses) included in earnings relating to assets still held	(1)	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	280	381
Gains (Losses) included in earnings	(13)	(9)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Ending Balance	267	372
Changes in unrealized gains (losses) included in earnings relating to assets still held	5	4
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	121,570	118,395
Gains (Losses) included in earnings	1,017	512
Gains (losses) included in OCI	0	0
Additions	2,771	3,636
Settlements	0	0
Ending Balance	125,358	122,543
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ 4,252	$ 5,162

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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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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-Publisher FASB
-Name Accounting Standards Codification
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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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