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Fair value measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Minimum
Fair value measurements
Significant unobservable input value, prepayment speed	15.00%
Maximum
Fair value measurements
Significant unobservable input value, prepayment speed	22.00%
Weighted Average
Fair value measurements
Significant unobservable input value, prepayment speed	22.00%
Significant unobservable input value, discount rate	9.30%
Discounted cash flow
Fair value measurements
Mortgage servicing rights	$ 3,001
Commercial | Fair value of collateral
Fair value measurements
Fair value	$ 387
Residential land | Fair value of collateral
Fair value measurements
Fair value		$ 25

X

- Definition

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

+ References

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-Publisher FASB
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-Topic 820
-SubTopic 10
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
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X

- Definition

Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

+ References

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- Definition

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

+ References

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