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Note Loans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Aug. 01, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds $ 138,659 $ 108,091 $ 399,278 $ 461,273      
Loans and Leases Receivable, Gross, Carrying Amount, Covered 0   0       $ 517,274
Loans transfer to non-covered status           $ 514,600  
Mortgage loans related to buy-back option program 26,661,951   26,661,951       24,423,427
Non-covered Loans held-in-portfolio 26,512,168   26,512,168       24,292,794
Reliable Financial Services              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans acquired         $ 1,785,958    
Buy back option program              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accruing loans past-due 90 days or more 195,000   195,000       840,000
Mortgage loans related to buy-back option program 195,000   195,000       840,000
GNMA              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 110,000 86,000 320,000 369,000      
FNMA              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 26,000 21,000 72,000 86,000      
Residential Mortgage              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Residential Mortgage Loans Sold 19,000 9,000 45,000 63,000      
Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Purchase of Loans 48,000 133,000 152,000 283,000      
Non-covered Loans held-in-portfolio 5,339,820   5,339,820       3,810,527
Mortgages              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Purchase of Loans 147,000 $ 104,000 480,000 364,000      
Non-covered Loans held-in-portfolio 7,304,170   7,304,170       7,270,407
Mortgages | US Government Agency Insured Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Non-covered Loans held-in-portfolio 1,400,000   1,400,000       1,800,000
Mortgages | US Government Agency Insured Loans | Past Due 90 Days or More              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Past Due 739,000   739,000       1,200,000
Commercial Loans | Reliable Financial Services              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans acquired         341,000    
Leasing              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Purchase of Loans       $ 2,000      
Non-covered Loans held-in-portfolio 903,540   903,540       809,990
Reverse Mortgages              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Current 53,000   53,000       58,000
Residential mortgage loans insured By FHA              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accruing loans past-due 90 days or more 238,000   238,000       178,000
Auto Loan              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Non-covered Loans held-in-portfolio 2,468,610   2,468,610       850,813
Auto Loan | Reliable Financial Services              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans acquired         $ 1,600,000    
ASC Subtopic 310-30              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Outstanding principal balance of SOP loans $ 2,300,000   $ 2,300,000       $ 2,500,000