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Fair value measurements - Summary of Level 3 financial instruments (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair value measurements |  |
Discount rate | 9.30% | 9.30%
Minimum |  |
Fair value measurements |  |
Prepayment speed percentage | 17.00% | 15.00%
Maximum |  |
Fair value measurements |  |
Prepayment speed percentage | 24.00% | 22.00%
Weighted Average |  |
Fair value measurements |  |
Prepayment speed percentage | 17.00% | 22.00%
Discounted cash flow |  |
Fair value measurements |  |
Mortgage servicing rights | $ 61 | $ 3,001
Home equity line of credit | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 69 |
Commercial loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value |  | $ 387

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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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