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Loans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Aug. 01, 2018
Accounts, Notes, Loans and Financing Receivable            
Commercial Construction Loans Sold $ 47,000   $ 81,000      
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 122,874 $ 138,659 337,140 $ 399,278    
Mortgage loans related to buy-back option program 27,181,241   27,181,241   $ 26,663,713  
Non-covered Loans held-in-portfolio 27,007,975   27,007,975   26,507,889  
Reliable Financial Services            
Accounts, Notes, Loans and Financing Receivable            
Loans acquired           $ 1,802,463
Buy back option program            
Accounts, Notes, Loans and Financing Receivable            
Accruing loans past-due 90 days or more 99,000   99,000   134,000  
Mortgage loans related to buy-back option program 99,000   99,000   134,000  
Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable            
Residential Mortgage Loans Sold 18,000 19,000 46,000 45,000    
GNMA            
Accounts, Notes, Loans and Financing Receivable            
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 88,000 110,000 247,000 320,000    
FNMA            
Accounts, Notes, Loans and Financing Receivable            
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 33,000 26,000 84,000 72,000    
Consumer            
Accounts, Notes, Loans and Financing Receivable            
Purchase of Loans 64,000 48,000 222,000 152,000    
Non-covered Loans held-in-portfolio 5,831,175   5,831,175   5,489,441  
Mortgages            
Accounts, Notes, Loans and Financing Receivable            
Purchase of Loans 81,000 $ 147,000 266,000 $ 480,000    
Non-covered Loans held-in-portfolio 7,168,619   7,168,619   7,235,258  
Mortgages | US Government Agency Insured Loans            
Accounts, Notes, Loans and Financing Receivable            
Non-covered Loans held-in-portfolio 1,400,000   1,400,000   1,400,000  
Mortgages | US Government Agency Insured Loans | Past Due 90 Days or More            
Accounts, Notes, Loans and Financing Receivable            
Past Due 461,000   461,000   598,000  
Commercial Loans            
Accounts, Notes, Loans and Financing Receivable            
Purchase of Loans     43,000      
Commercial Loans | Reliable Financial Services            
Accounts, Notes, Loans and Financing Receivable            
Loans acquired           341,000
Reverse Mortgages            
Accounts, Notes, Loans and Financing Receivable            
Current 65,000   65,000   69,000  
Residential mortgage loans insured By FHA            
Accounts, Notes, Loans and Financing Receivable            
Accruing loans past-due 90 days or more 241,000   241,000   283,000  
Auto Loan            
Accounts, Notes, Loans and Financing Receivable            
Non-covered Loans held-in-portfolio 2,847,758   2,847,758   2,608,785  
Auto Loan | Reliable Financial Services            
Accounts, Notes, Loans and Financing Receivable            
Loans acquired           $ 1,600,000
ASC Subtopic 310-30            
Accounts, Notes, Loans and Financing Receivable            
Outstanding principal balance of SOP loans $ 1,900,000   $ 1,900,000   $ 2,200,000