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Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Loan facility carrying amount $ 8,382,316   $ 8,382,316   $ 8,141,430
Bayview Lending Group [Member]          
Schedule of Equity Method Investments [Line Items]          
Minority interest in Bayview Lending Group LLC 20.00%   20.00%    
Carrying value of minority interest investment in Bayview Lending Group LLC $ 0   $ 0    
Bayview Lending Group [Member] | Other Revenues From Operations [Member]          
Schedule of Equity Method Investments [Line Items]          
Income (loss) from equity method investments     23,000    
Bayview Lending Group and Bayview Financial [Member]          
Schedule of Equity Method Investments [Line Items]          
Outstanding principal balances of mortgage servicing rights 2,800,000   2,800,000   3,000,000
Bayview Lending Group and Bayview Financial [Member] | Bank Servicing [Member]          
Schedule of Equity Method Investments [Line Items]          
Revenue from contract with customer 4,000 $ 4,000 7,000 $ 9,000  
Bayview Financial [Member]          
Schedule of Equity Method Investments [Line Items]          
Outstanding principal balances of residential mortgage loans from Bayview Financial 53,500,000   53,500,000   56,600,000
Revenues from sub-servicing 28,000 $ 25,000 58,000 $ 48,000  
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 123,000   123,000   $ 136,000
Bayview Financial [Member] | Syndicated Loan Facility [Member]          
Schedule of Equity Method Investments [Line Items]          
Loan facility carrying amount 750,000   750,000    
Bayview Financial [Member] | Syndicated Loan Facility [Member] | M&T Bank [Member]          
Schedule of Equity Method Investments [Line Items]          
Loan facility carrying amount $ 90,000   $ 90,000