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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount $ 3,485,369,000 $ 4,382,193,000  
Bayview Lending Group [Member]      
Schedule of Equity Method Investments [Line Items]      
Minority interest in Bayview Lending Group LLC 20.00%    
Carrying value of minority interest investment in Bayview Lending Group LLC $ 0    
Bayview Lending Group [Member] | Other Revenues From Operations [Member]      
Schedule of Equity Method Investments [Line Items]      
Income (loss) from equity method investments 30,000,000 53,000,000 $ 37,000,000
Bayview Lending Group and Bayview Financial [Member]      
Schedule of Equity Method Investments [Line Items]      
Outstanding principal balances of mortgage servicing rights 1,600,000,000 1,900,000,000  
Revenue from contract with customer 9,000,000 10,000,000 12,000,000
Bayview Financial [Member]      
Schedule of Equity Method Investments [Line Items]      
Outstanding principal balances of residential mortgage loans from Bayview Financial 74,700,000,000 68,100,000,000  
Revenues from sub-servicing 153,000,000 129,000,000 $ 125,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 62,000,000 $ 77,000,000  
Bayview Financial [Member] | FHA Guaranteed Mortgage Loans [Member]      
Schedule of Equity Method Investments [Line Items]      
FHA gauranteed mortgage loan 965,000,000    
FHA gauranteed purchase amount of deliquent loan 1,000,000,000.0    
Bayview Financial [Member] | Syndicated Loan Facility [Member]      
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount 1,400,000,000    
Bayview Financial [Member] | Syndicated Loan Facility [Member] | M&T Bank [Member]      
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount $ 210,000,000