Servicing rights - Estimated valuation (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Minimum \| Freddie Mac
Servicing rights, valuation assumptions
Forward prepayment assumptions	0.10%	0.00%
Forward default rate	0.00%	0.00%
Discount rate	6.00%	12.00%
Servicing expense (as a percent)	0.20%	0.20%
Maximum \| Freddie Mac
Servicing rights, valuation assumptions
Forward prepayment assumptions	35.40%	35.00%
Forward default rate	2.00%	2.00%
Discount rate	6.00%	12.00%
Servicing expense (as a percent)	0.30%	0.20%
Weighted Average \| Freddie Mac
Servicing rights, valuation assumptions
Forward prepayment assumptions	5.30%	5.00%
Forward default rate	2.00%	1.30%
Discount rate	6.00%	12.00%
Servicing expense (as a percent)	0.20%	0.20%
SBA \| Minimum
Servicing rights, valuation assumptions
Forward prepayment assumptions	4.60%	3.80%
Forward default rate	0.00%	0.00%
Discount rate	8.80%	12.00%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Maximum
Servicing rights, valuation assumptions
Forward prepayment assumptions	21.30%	20.20%
Forward default rate	11.70%	12.20%
Discount rate	8.80%	12.00%
Servicing expense (as a percent)	0.40%	0.40%
SBA \| Weighted Average
Servicing rights, valuation assumptions
Forward prepayment assumptions	8.40%	9.20%
Forward default rate	7.60%	6.40%
Discount rate	8.80%	12.00%
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://fasb.org/us-gaap/role/ref/legacyRef
-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.

+ References

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- Definition

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

+ References

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