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Mortgage servicing rights - Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Transfers and Servicing of Financial Assets [Abstract]    
Unpaid principal balance $ 10,113,716 $ 9,787,657
Weighted-average prepayment speed (CPR) 8.04% 14.07%
Estimated impact on fair value of a 10% increase $ (4,247) $ (4,493)
Estimated impact on fair value of a 20% increase $ (8,191) $ (8,599)
Discount rate 11.81% 11.49%
Estimated impact on fair value of a 100 bp increase $ (4,166) $ (2,942)
Estimated impact on fair value of a 200 bp increase $ (8,024) $ (5,674)
Weighted-average coupon interest rate 3.45% 3.58%
Weighted-average servicing fee (basis points) 0.28% 0.28%
Weighted-average remaining maturity (in months) 329 months 328 months