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Basis of Presentation and Significant Accounting Policies - Impaired Loans, Allowance for Loan Losses and Charge-offs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Impaired Loans, Allowance for Loan Losses and Charge-offs            
Adjustments made to appraisals $ 0          
Allowance for Loss-Sharing Obligations            
Period of a loan past due becomes delinquent 60 days          
Real Estate Owned and Held-For-Sale            
Period following acquisition in which the entity finalizes the purchase price allocation of the real estate properties acquired 1 year          
Operating lease liabilities     $ 20,100      
Operating lease ROU assets $ 20,100          
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other Assets.          
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities.          
Cumulative allowances for loan losses $ 71,069     $ 71,069 $ 62,783 $ 83,712
Fannie Mae            
Allowance for Loss-Sharing Obligations            
Percentage of loss obligation on UPB 5.00%          
Percentage of additional loss obligation on UPB 5.00%          
Obligated funding percentage of mortgage delinquencies 100.00%          
Loss sharing funding percentage of advances until final settlement 25.00%          
ASU 2016-15            
Significant Accounting Policies            
Reclassification of Proceeds from Insurance Settlements from Operating Activities to Investing Activities $ 1,100          
ASU 2016-13            
Real Estate Owned and Held-For-Sale            
Cumulative allowances for loan losses   $ 37,000        
ASU 2016-13 | Previously reported            
Real Estate Owned and Held-For-Sale            
Cumulative allowances for loan losses   $ 27,000        
Minimum            
Loans Held-for-Sale, Net            
Maximum number of days held-for-sale loans are generally transferred or sold 60 days          
Maximum            
Loans Held-for-Sale, Net            
Maximum number of days held-for-sale loans are generally transferred or sold 180 days          
Maximum | Fannie Mae            
Allowance for Loss-Sharing Obligations            
Percentage of loss obligation on UPB 20.00%          
Commercial Loans | MSRs            
Capitalized Mortgage Servicing Rights            
Inflation rate used for adequate compensation 3.00%          
Commercial Loans | MSRs | Discount rate | Minimum            
Capitalized Mortgage Servicing Rights            
Discount rates to determine the present value of MSRs (as a percent) 8          
Commercial Loans | MSRs | Discount rate | Maximum            
Capitalized Mortgage Servicing Rights            
Discount rates to determine the present value of MSRs (as a percent) 15          
Commercial Loans | MSRs | Discount rate | Weighted average            
Capitalized Mortgage Servicing Rights            
Discount rates to determine the present value of MSRs (as a percent) 12