Servicing rights - Estimated valuation (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Multi-family \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.00%	0.10%
Forward default rate	0.00%	0.00%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.00%	0.20%
Multi-family \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	7.30%	5.10%
Forward default rate	1.30%	0.40%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.80%	0.30%
Multi-family \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	3.50%	2.40%
Forward default rate	1.00%	0.30%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.10%	0.20%
SBA \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	7.90%	6.70%
Forward default rate	0.00%	0.00%
Discount rate	10.00%	4.50%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	21.00%	20.80%
Forward default rate	10.40%	10.50%
Discount rate	21.30%	4.50%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	8.90%	8.50%
Forward default rate	9.10%	8.20%
Discount rate	10.70%	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.

+ Details

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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=125521744&loc=d3e122596-111746

+ Details

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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.

+ References

+ Details

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- Definition

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

+ References

+ Details

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