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, 2024	Mar. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 121,499	$ 130,596
Gains (Losses) included in earnings	(3,940)	(1,385)
Gains (losses) included in OCI	1	(6)
Additions	294	501
Settlements	(33)	(101)
Ending Balance	117,821	129,605
Changes in unrealized gains (losses) included in earnings relating to assets still held	(1,700)	1,295
Debt securities available-for-sale \| Mortgage Backed Securities - federal agencies
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	606	711
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	1	(6)
Additions	0	0
Settlements	0	(50)
Ending Balance	607	655
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	2,500	1,000
Gains (Losses) included in earnings	(500)	0
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Ending Balance	2,000	1,000
Changes in unrealized gains (losses) included in earnings relating to assets still held	(500)	0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	5	113
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	(5)	(25)
Ending Balance	0	88
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0
Trading account debt securities \| Mortgage Backed Securities - federal agencies
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	112	215
Gains (Losses) included in earnings	0	(1)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	(28)	(26)
Ending Balance	84	188
Changes in unrealized gains (losses) included in earnings relating to assets still held	0	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	167	207
Gains (Losses) included in earnings	(1)	(8)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Ending Balance	166	199
Changes in unrealized gains (losses) included in earnings relating to assets still held	2	9
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	118,109	128,350
Gains (Losses) included in earnings	(3,439)	(1,376)
Gains (losses) included in OCI	0	0
Additions	294	501
Settlements	0	0
Ending Balance	114,964	127,475
Changes in unrealized gains (losses) included in earnings relating to assets still held	$ (1,202)	$ 1,286

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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 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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