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Transfers of financial assets and servicing assets - Fair value of purchased and originated MSRs, valuation assumptions and sensitivity (Details) - Residential Mortgage - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Originated MSRs    
Transfers of financial assets    
Fair value of servicing rights $ 59,798 $ 69,400
Weighted average life 6 years 6 months 7 years 1 month 6 days
Prepayment speed 6.40% 5.10%
Impact on fair value of 10% adverse change $ (1,536) $ (1,430)
Impact on fair value of 20% adverse change $ (3,017) $ (2,817)
Discount rate 11.40% 11.50%
Impact on fair value of 10% adverse change $ (2,375) $ (3,125)
Impact on fair value of 20% adverse change (4,585) (6,019)
Purchased MSRs    
Transfers of financial assets    
Fair value of servicing rights $ 90,854 $ 100,377
Weighted average life 6 years 6 years 7 months 6 days
Prepayment speed 7.00% 5.50%
Impact on fair value of 10% adverse change $ (2,562) $ (2,200)
Impact on fair value of 20% adverse change $ (5,014) $ (4,328)
Discount rate 11.00% 11.00%
Impact on fair value of 10% adverse change $ (3,443) $ (4,354)
Impact on fair value of 20% adverse change $ (6,656) $ (8,394)