Annual report pursuant to Section 13 and 15(d)

Mortgage Servicing Rights - Summary of Activity of Mortgage Servicing Rights (Details)

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Mortgage Servicing Rights - Summary of Activity of Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Servicing Asset [Abstract]    
Balance — beginning of year $ 418,402 $ 511,852
MSRs originated and acquired through acquisitions 324,903 161,769
Changes in fair value:    
Due to collection/realization of cash flows (124,742) (83,821)
Due to changes in valuation model inputs or assumptions (171,565) (171,398)
Balance — end of year $ 446,998 $ 418,402