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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Lower of Cost or Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance $ 27,652 $ 73,160 $ 77,666
Purchases 0 0 320,089
Proceeds from sales (10,607) (58,575) (221,471)
Principal collections (989) (1,842) (11,304)
Receivables, net (1,020) 61 (104,635)
REO (Other assets) 0 0 (4,116)
Gain on sale of loans 549 11,189 4,974
Capitalization of advances on Ginnie Mae modifications 0 0 2,485
Other (220) 3,659 9,472
Ending balance 15,365 27,652 73,160
Ending balance $ 10,993 $ 21,472 $ 66,517