Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 122,874	$ 120,068	$ 153,058
Gains (Losses) included in earnings	95	(10,318)	(42,115)
Gains (losses) included in OCI	(15)	(13)	(18)
Additions	7,830	13,419	9,548
Settlements	(188)	(282)	(405)
Ending Balance	130,596	122,874	120,068
Changes in unrealized gains (losses) included in earnings relating to assets still held	11,943	6,364	(19,300)
Liabilities, Fair Value Disclosure [Abstract]
Beginning Balance	(9,241)	0
Gains (Losses) included in earnings	9,241	0
Gains (losses) included in OCI	0	0
Additions	0	(9,241)
Settlements	0	0
Ending Balance	0	(9,241)	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)	0
Gains (Losses) included in earnings	9,241	0
Gains (losses) included in OCI	0	0
Additions	0	(9,241)
Settlements	0	0
Ending Balance	0	(9,241)	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	826	1,014	1,182
Gains (Losses) included in earnings	0	0	0
Gains (losses) included in OCI	(15)	(13)	(18)
Additions	0	0	0
Settlements	(100)	(175)	(150)
Ending Balance	711	826	1,014
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	0
Gains (Losses) included in earnings	0
Gains (losses) included in OCI	0
Additions	1,000
Settlements	0
Ending Balance	1,000	0
Changes in unrealized gains (losses) included in earnings relating to assets still held	0
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	0
Gains (Losses) included in earnings	4
Gains (losses) included in OCI	0
Additions	211
Settlements	0
Ending Balance	215	0
Changes in unrealized gains (losses) included in earnings relating to assets still held	4
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	198	278	530
Gains (Losses) included in earnings	(2)	(1)	(1)
Gains (losses) included in OCI	0	0	0
Additions	5	29	4
Settlements	(88)	(107)	(255)
Ending Balance	113	198	278
Changes in unrealized gains (losses) included in earnings relating to assets still held	(2)	(1)	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	280	381	440
Gains (Losses) included in earnings	(73)	(101)	(59)
Gains (losses) included in OCI	0	0	0
Additions	0	0	0
Settlements	0	0	0
Ending Balance	207	280	381
Changes in unrealized gains (losses) included in earnings relating to assets still held	(23)	(45)	27
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	121,570	118,395	150,906
Gains (Losses) included in earnings	166	(10,216)	(42,055)
Gains (losses) included in OCI	0	0	0
Additions	6,614	13,391	9,544
Settlements	0	0	0
Ending Balance	128,350	121,570	118,395
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ 11,964	$ 6,410	$ (19,327)

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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

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-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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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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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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Amount of settlements 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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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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