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, 2021	Mar. 31, 2020
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 120,068	$ 153,058
Gains (Losses) included in earnings	503	(5,240)
Gains (losses) included in OCI	(5)	(5)
Additions	3,637	1,636
Settlements	(103)	(66)
Ending Balance	124,100	149,383
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	5,166	(2,432)
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	1,014	1,182
Gains (Losses) included in earnings	0	0
Gains (losses) included in OCI	(5)	(5)
Additions	0	0
Settlements	(75)	0
Ending Balance	934	1,177
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	0
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance		0
Gains (Losses) included in earnings		0
Gains (losses) included in OCI		0
Additions		0
Settlements		0
Ending Balance		0
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss		0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	278	530
Gains (Losses) included in earnings	0	1
Gains (losses) included in OCI	0	0
Additions	1	2
Settlements	(28)	(66)
Ending Balance	251	467
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	0	1
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	381	440
Gains (Losses) included in earnings	(9)	(12)
Gains (losses) included in OCI	0	0
Additions	0	0
Settlements	0	0
Ending Balance	372	428
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	4	6
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	118,395	150,906
Gains (Losses) included in earnings	512	(5,229)
Gains (losses) included in OCI	0	0
Additions	3,636	1,634
Settlements	0	0
Ending Balance	122,543	147,311
Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss	$ 5,162	$ (2,439)

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(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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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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