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Note Loans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Aug. 01, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds $ 516,022 $ 468,931    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 0 517,274    
Loans transfer to non-covered status       $ 514,600
Mortgage loans related to buy-back option program 26,663,713 24,423,427    
Non-covered Loans held-in-portfolio 26,507,889 24,292,794    
Reliable Financial Services        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans acquired     $ 1,802,463  
Buy back option program        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accruing loans past-due 90 days or more 134,000 840,000    
Mortgage loans related to buy-back option program 134,000 840,000    
Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Residential Mortgage Loans Sold 59,000 64,000    
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 413,000 376,000    
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 94,000 86,000    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Purchase of Loans 205,000 311,000    
Non-covered Loans held-in-portfolio 5,489,441 3,810,527    
Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Purchase of Loans 624,000 460,000    
Non-covered Loans held-in-portfolio 7,235,258 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 1,800,000    
Mortgages | US Government Agency Insured Loans | Past Due 90 Days or More        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past Due 598,000 1,200,000    
Commercial Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Purchase of Loans   2,000    
Loans Sold 30,000      
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 934,773 809,990    
Reverse Mortgages        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current 69,000 58,000    
Residential mortgage loans insured By FHA        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Accruing loans past-due 90 days or more 283,000 178,000    
Auto Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-covered Loans held-in-portfolio 2,608,785 850,813    
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 $ 2,200,000 $ 2,500,000