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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2014
Servicing Asset at Amortized Cost [Line Items] |  |  |
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings | $ 0 | $ 52,015 |
Non Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings |  |  | $ 52,000
Deferred income taxes |  |  | 9,200
Unpaid principal balance of MSRs |  |  | $ 195,300,000

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + 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) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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