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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 116,209	$ 123,314	$ 121,499	$ 130,596
Gains (Losses) included in earnings	(4,900)	(2,796)	(10,793)	(10,407)
Gains (losses) included in OCI	2	(2)	2	(8)
Additions	337	574	998	1,818
Sales				(1,269)
Settlements	(25)	(72)	(83)	288
Ending Balance	111,623	121,018	111,623	121,018
Changes in unrealized gains (losses) included in earnings relating to assets still held	(2,571)	(377)	(3,261)	(1,807)
Debt securities available-for-sale \| Mortgage Backed Securities - federal agencies
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	581	655	606	711
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	2	(2)	2	(8)
Additions	0	0	0	0
Sales				0
Settlements	(25)	0	(50)	(50)
Ending Balance	558	653	558	653
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	2,000	1,000	2,500	1,000
Gains (Losses) included in earnings	0	0	(500)	0
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales				0
Settlements	0	0	0	0
Ending Balance	2,000	1,000	2,000	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	5	113
Gains (Losses) included in earnings		0	0	0
Gains (losses) included in OCI		0	0	0
Additions		0	0	4
Sales				0
Settlements		(46)	(5)	(107)
Ending Balance	0	10	0	10
Changes in unrealized gains (losses) included in earnings relating to assets still held		0	0	0
Trading account debt securities \| Mortgage Backed Securities - federal agencies
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	84	163	112	215
Gains (Losses) included in earnings	0	0	0	(2)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales				0
Settlements	0	(26)	(28)	(76)
Ending Balance	84	137	84	137
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0	0	(1)
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	158	191	167	207
Gains (Losses) included in earnings	(4)	(3)	(13)	(19)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Sales				0
Settlements	0	0	0	0
Ending Balance	154	188	154	188
Changes in unrealized gains (losses) included in earnings relating to assets still held	6	4	18	22
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	113,386	121,249	118,109	128,350
Gains (Losses) included in earnings	(4,896)	(2,793)	(10,280)	(10,386)
Gains (losses) included in OCI	0	0	0	0
Additions	337	574	998	1,814
Sales				(1,269)
Settlements	0	0	0	521
Ending Balance	108,827	119,030	108,827	119,030
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ (2,577)	$ (381)	$ (3,279)	$ (1,828)

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- Definition

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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of sale 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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