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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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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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