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Transfers of financial assets and servicing assets - Changes in MSRs measured using the fair value method (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Transfers and Servicing of Financial Assets    
Fair value at beginning of period $ 150,906 $ 169,777
Additions 9,544 9,143
Changes due to payments of loans (11,692) (11,549)
Reduction due to loan repurchases (11,060) (1,777)
Changes in fair value due to changes in valuation model inputs or assumptions (19,327) (14,190)
Other disposals 24 (498)
Fair value at end of period $ 118,395 $ 150,906