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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 |  |  |  |  |

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