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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 117,821	$ 129,605	$ 121,499	$ 130,596
Gains (Losses) included in earnings	(1,953)	(6,225)	(5,893)	(7,611)
Gains (losses) included in OCI	(1)			(6)
Additions	367	743	661	1,244
Sales		(1,269)		(1,269)
Settlements	(25)	460	(58)	360
Ending Balance	116,209	123,314	116,209	123,314
Changes in unrealized gains (losses) included in earnings relating to assets still held	510	(2,723)	(1,190)	(1,430)
Debt securities available-for-sale \| Mortgage Backed Securities - federal agencies
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	607	655	606	711
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	(1)			(6)
Additions	0	0	0	0
Sales		0		0
Settlements	(25)	0	(25)	(50)
Ending Balance	581	655	581	655
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
Additions	0	0	0	0
Sales		0		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	(500)	0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance		88	5	113
Gains (Losses) included in earnings		0	0	0
Gains (losses) included in OCI				0
Additions		4	0	4
Sales		0		0
Settlements		(36)	(5)	(61)
Ending Balance	0	56	0	56
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	188	112	215
Gains (Losses) included in earnings	0	0	0	(2)
Gains (losses) included in OCI	0			0
Additions	0	0	0	0
Sales		0		0
Settlements	0	(25)	(28)	(50)
Ending Balance	84	163	84	163
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	166	199	167	207
Gains (Losses) included in earnings	(8)	(8)	(9)	(16)
Gains (losses) included in OCI	0			0
Additions	0	0	0	0
Sales		0		0
Settlements	0	0	0	0
Ending Balance	158	191	158	191
Changes in unrealized gains (losses) included in earnings relating to assets still held	10	9	12	18
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	114,964	127,475	118,109	128,350
Gains (Losses) included in earnings	(1,945)	(6,217)	(5,384)	(7,593)
Gains (losses) included in OCI	0			0
Additions	367	739	661	1,240
Sales		(1,269)		(1,269)
Settlements	0	521	0	521
Ending Balance	113,386	121,249	113,386	121,249
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ 500	$ (2,732)	$ (702)	$ (1,447)

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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
-Subparagraph (c)(2)
-Publisher FASB
-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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- Definition

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.

+ References

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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