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Mortgage Servicing Rights - Changes to MSR Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes to MSR Assets    
Fair value, beginning of period $ 6,946,940 $ 5,385,613
MSRs originated 204,560 796,616
MSRs sales (81,538) (253,997)
Changes in fair value:    
Due to changes in valuation model inputs or assumptions (217,802) 767,271
Due to collection/realization of cash flows (182,221) (285,215)
Total changes in fair value (400,023) 482,056
Fair value, end of period $ 6,669,939 $ 6,410,288
Servicing asset, fair value, change in fair value, other, statement of income or comprehensive income Gain (Loss) on Sales of Loans, Net Gain (Loss) on Sales of Loans, Net