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Mortgage Servicing (Details) - MSRs | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Institution | Dec. 31, 2016 USD ($)
Mortgage Servicing |  |
Unpaid principal balance of loans serviced | $ 15,601,225,516 | $ 13,555,085,518
Weighted average servicing fee (as a percent) | 0.48% | 0.478%
Number of federally insured depository institutions holding cash balance and related escrow liabilities for servicing mortgage | Institution | 2 |
Fee-based servicing portfolio |  |
Mortgage Servicing |  |
Percentage of Total | 100.00% | 100.00%
Escrow Deposit | $ 506,600,000 | $ 401,700,000
Fee-based servicing portfolio | Texas |  |
Mortgage Servicing |  |
Percentage of Total | 23.00% | 24.00%
Fee-based servicing portfolio | North Carolina |  |
Mortgage Servicing |  |
Percentage of Total | 10.00% | 9.00%
Fee-based servicing portfolio | California |  |
Mortgage Servicing |  |
Percentage of Total | 8.00% | 8.00%
Fee-based servicing portfolio | New York |  |
Mortgage Servicing |  |
Percentage of Total | 8.00% | 8.00%
Fee-based servicing portfolio | Georgia |  |
Mortgage Servicing |  |
Percentage of Total | 6.00% | 5.00%
Fee-based servicing portfolio | Florida |  |
Mortgage Servicing |  |
Percentage of Total | 5.00% |
Fee-based servicing portfolio | Other |  |
Mortgage Servicing |  |
Percentage of Total | 40.00% | 46.00%
Fannie Mae |  |
Mortgage Servicing |  |
Unpaid principal balance of loans serviced | $ 12,331,135,405 | $ 11,181,152,400
Fannie Mae | Fee-based servicing portfolio |  |
Mortgage Servicing |  |
Percentage of Total | 79.00% | 83.00%
Freddie Mac |  |
Mortgage Servicing |  |
Unpaid principal balance of loans serviced | $ 2,732,536,579 | $ 1,953,244,541
Freddie Mac | Fee-based servicing portfolio |  |
Mortgage Servicing |  |
Percentage of Total | 18.00% | 14.00%
FHA |  |
Mortgage Servicing |  |
Unpaid principal balance of loans serviced | $ 537,553,532 | $ 420,688,577
FHA | Fee-based servicing portfolio |  |
Mortgage Servicing |  |
Percentage of Total | 3.00% | 3.00%

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- Definition Number of federally insured depository institutions. + References No definition available. + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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