Servicing rights - Estimated valuation (Details)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
SBA servicing rights \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.00%	10.20%
Forward default rate	0.00%	0.00%
Discount rate	14.40%	18.00%
Servicing expense (as a percent)	0.40%	0.40%
SBA servicing rights \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	4.50%	21.60%
Forward default rate	7.30%	10.00%
Discount rate	22.90%	31.40%
Servicing expense (as a percent)	0.40%	0.40%
SBA servicing rights \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	4.40%	10.60%
Forward default rate	7.00%	9.20%
Discount rate	14.60%	18.70%
Servicing expense (as a percent)	0.40%	0.40%
Multi-family servicing rights \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.00%	0.00%
Forward default rate	0.00%	0.00%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.00%	0.00%
Multi-family servicing rights \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	6.50%	7.20%
Forward default rate	0.90%	1.10%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.80%	0.80%
Multi-family servicing rights \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	5.40%	3.50%
Forward default rate	0.60%	0.80%
Discount rate	6.00%	6.00%
Servicing expense (as a percent)	0.10%	0.10%

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

No definition available.

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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
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-2

+ 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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- Details

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