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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 126,592	$ 124,100	$ 122,874	$ 120,068
Gains (Losses) included in earnings	2,255	(6,260)	3,258	(5,757)
Gains (losses) included in OCI	11	4	3	(1)
Additions	2,761	3,196	5,534	6,833
Settlements	(47)	(24)	(97)	(127)
Ending Balance	131,572	121,016	131,572	121,016
Changes in unrealized gains (losses) included in earnings relating to assets still held	5,319	(2,031)	9,577	3,135
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	793	934	826	1,014
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	11	4	3	(1)
Additions	0	0	0	0
Settlements	(25)	0	(50)	(75)
Ending Balance	779	938	779	938
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	0		0
Gains (Losses) included in earnings	0		0
Gains (losses) included in OCI	0		0
Additions	500		500
Settlements	0		0
Ending Balance	500		500
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	174	251	198	278
Gains (Losses) included in earnings	0	0	(1)	0
Gains (losses) included in OCI	0	0	0	0
Additions	0	23	2	24
Settlements	(22)	(24)	(47)	(52)
Ending Balance	152	250	152	250
Changes in unrealized gains (losses) included in earnings relating to assets still held	(1)	0	(1)	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	267	372	280	381
Gains (Losses) included in earnings	(3)	(11)	(16)	(20)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Settlements	0	0	0	0
Ending Balance	264	361	264	361
Changes in unrealized gains (losses) included in earnings relating to assets still held	2	5	7	9
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	125,358	122,543	121,570	118,395
Gains (Losses) included in earnings	2,258	(6,249)	3,275	(5,737)
Gains (losses) included in OCI	0	0	0	0
Additions	2,261	3,173	5,032	6,809
Settlements	0	0	0	0
Ending Balance	129,877	119,467	129,877	119,467
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ 5,318	$ (2,036)	$ 9,571	$ 3,126

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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
-Topic 820
-SubTopic 10
-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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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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