Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Details)

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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Liabilities:    
Ginnie Mae loans subject to repurchase right $ 1,277,026 $ 412,490
Non-Recurring Fair Value Measurements    
Assets:    
Total assets at fair value 1,275,842 404,344
Liabilities:    
Ginnie Mae loans subject to repurchase right 1,277,026 412,490
Non-Recurring Fair Value Measurements | Ginnie Mae    
Assets:    
Total assets at fair value 1,275,842 404,344
Liabilities:    
Ginnie Mae loans subject to repurchase right 1,277,026 412,490
Non-Recurring Fair Value Measurements | Level 2    
Assets:    
Total assets at fair value 1,275,842 404,344
Liabilities:    
Ginnie Mae loans subject to repurchase right 1,277,026 412,490
Non-Recurring Fair Value Measurements | Level 2 | Ginnie Mae    
Assets:    
Total assets at fair value 1,275,842 404,344
Liabilities:    
Ginnie Mae loans subject to repurchase right $ 1,277,026 $ 412,490