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Segment Information - Key Servicing Metrics (Details) - Agency Business - MSRs - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Segment Information |  |
UPB of Servicing Portfolio | $ 15,601,225,516 | $ 13,555,085,518
Wtd. Avg. Servicing Fee Rate (basis points) | 0.48% | 0.478%
Wtd. Avg. Life of Servicing Portfolio (in years) | 8 years 3 months 18 days | 7 years 7 months 6 days
Fannie Mae |  |
Segment Information |  |
UPB of Servicing Portfolio | $ 12,331,135,405 | $ 11,181,152,400
Wtd. Avg. Servicing Fee Rate (basis points) | 0.537% | 0.534%
Wtd. Avg. Life of Servicing Portfolio (in years) | 7 years 2 months 12 days | 6 years 7 months 6 days
Freddie Mac |  |
Segment Information |  |
UPB of Servicing Portfolio | $ 2,732,536,579 | $ 1,953,244,541
Wtd. Avg. Servicing Fee Rate (basis points) | 0.286% | 0.223%
Wtd. Avg. Life of Servicing Portfolio (in years) | 10 years 10 months 24 days | 10 years 6 months
FHA |  |
Segment Information |  |
UPB of Servicing Portfolio | $ 537,553,532 | $ 420,688,577
Wtd. Avg. Servicing Fee Rate (basis points) | 0.165% | 0.144%
Wtd. Avg. Life of Servicing Portfolio (in years) | 20 years | 19 years 2 months 12 days

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