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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount $ 8,444,914 $ 8,141,430  
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 24,000 0 $ (11,000)
Bayview Lending Group and Bayview Financial [Member]      
Schedule of Equity Method Investments [Line Items]      
Outstanding principal balances of mortgage servicing rights 2,500,000 3,000,000  
Revenue from contract with customer 14,000 17,000 19,000
Bayview Financial [Member]      
Schedule of Equity Method Investments [Line Items]      
Outstanding principal balances of residential mortgage loans from Bayview Financial 56,800,000 56,600,000  
Revenues from sub-servicing 114,000 103,000 $ 98,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 113,000 $ 136,000  
Bayview Financial [Member] | Syndicated Loan Facility [Member]      
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount 900,000    
Bayview Financial [Member] | Syndicated Loan Facility [Member] | M&T Bank [Member]      
Schedule of Equity Method Investments [Line Items]      
Loan facility carrying amount $ 127,000