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Mortgage Servicing - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Transfers and Servicing [Abstract] |  |
UPB of MSRs sold | $ 3.3 | $ 100.0
Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings | 28,900.0 |
Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered | $ 9,100.0 |
Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio | 9.00% |
Float balances | $ 1,600.0 | $ 2,000.0

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- Definition Percentage of non-agency and whole loans servicing agreements with termination rights triggered of servicing portfolio. + References No definition available. + Details
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- Definition Unpaid principal balance of non-agency and whole loans servicing agreements with minimum servicer ratings. + References No definition available. + Details
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- Definition Unpaid principal balance of non-agency and whole loans servicing agreements with termination rights triggered. + References No definition available. + Details
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- Definition The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition The carrying amount of mortgage loans on real estate that were sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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