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Mortgage servicing rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Servicing income: |  |  |  |
Servicing income | $ 5,536 | $ 3,960 | $ 15,667 | $ 12,763
Change in fair value of mortgage servicing rights | (7,175) | (10,611) | (42,251) | (23,832)
Change in fair value of derivative hedging instruments | (265) | 5,520 | 15,705 | 13,060
Servicing income | (1,904) | (1,131) | (10,879) | 1,991
Servicing expenses | 1,999 | 1,732 | 5,392 | 4,961
Net servicing (loss) income | $ (3,903) | $ (2,863) | $ (16,271) | $ (2,970)

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- Definition Change in fair value of derivative hedging instruments. + References No definition available. + Details
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- Definition Change in fair value of mortgage servicing rights. + References No definition available. + Details
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- Definition Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset (Liabilities) + References No definition available. + Details
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- Definition Gross servicing expenses. + References No definition available. + Details
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- Definition Servicing income. + References No definition available. + Details
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- Definition Servicing income (loss). + References No definition available. + Details
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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746 + Details
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