Servicing rights - Estimated valuation (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Freddie Mac \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.10%	0.10%
Forward default rate	0.00%	0.00%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.20%	0.20%
Freddie Mac \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	5.10%	5.10%
Forward default rate	0.40%	0.40%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.30%	0.30%
Freddie Mac \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	2.40%	2.40%
Forward default rate	0.30%	0.30%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.20%	0.20%
SBA \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	6.70%	6.70%
Forward default rate	0.00%	0.00%
Discount rate	4.50%	4.50%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	20.90%	20.80%
Forward default rate	10.40%	10.50%
Discount rate	4.50%	4.50%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	8.40%	8.50%
Forward default rate	8.30%	8.20%
Discount rate	4.50%	4.50%
Servicing expense (as a percent)	0.40%	0.40%

Amount of estimated servicing expense as a percent of total servicing rights.

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- References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122596-111746

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- Definition

Percentage of contractually collectible principal associated with a financial asset expected not to be collected due to default by the borrower.

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- Definition

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

+ References

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