Servicing rights - Estimated valuation (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
SBA servicing rights \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.00%	0.00%
Forward default rate	0.00%	0.00%
Discount rate	12.50%	14.40%
Servicing expense (as a percent)	0.40%	0.40%
SBA servicing rights \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	5.20%	4.50%
Forward default rate	7.20%	7.30%
Discount rate	22.50%	22.90%
Servicing expense (as a percent)	0.40%	0.40%
SBA servicing rights \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	5.00%	4.40%
Forward default rate	6.90%	7.00%
Discount rate	12.80%	14.60%
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%	6.50%
Forward default rate	0.90%	0.90%
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	5.50%	5.40%
Forward default rate	0.60%	0.60%
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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