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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 + Details
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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 + Details
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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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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