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Derivative Financial Instruments - Derivative Instruments (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |
Derivative instruments at fair value, less than | $ 0.1 | $ 0.1 | $ 0.1
Derivative Assets | Loan sale commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 1,659.0 | 368.0 |
Fair Value - Asset | 47.0 | 7.2 |
Recorded Gains/(Losses) | 21.1 | 7.1 |
Derivative Assets | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 3,649.0 | 1,778.0 |
Fair Value - Asset | 110.2 | 60.2 |
Recorded Gains/(Losses) | 50.5 | 0.9 |
Derivative Assets | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 762.0 | 568.0 |
Fair Value - Asset | 1.1 | 0.4 |
Recorded Gains/(Losses) | (0.7) | (2.0) |
Derivative Assets | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 1,327.0 | 271.0 |
Fair Value - Asset | 16.5 | 1.7 |
Recorded Gains/(Losses) | 14.8 | 0.8 |
Derivative Assets | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset |  | 35.0 |
Fair Value - Asset |  | 0.1 |
Recorded Gains/(Losses) |  | (1.8) |
Derivative Assets | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Asset | 8.0 | 22.0 |
Fair Value - Asset | 0.0 | 0.0 |
Recorded Gains/(Losses) | 0.0 | 0.0 |
Derivative Liabilities | IRLCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 4.0 | 1.0 |
Fair Value - Liability | 0.0 | 0.0 |
Recorded Gains/(Losses) | 0.0 | 0.0 |
Derivative Liabilities | Forward sales of MBS |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 4,932.0 | 2,710.0 |
Fair Value - Liability | 30.3 | 8.0 |
Recorded Gains/(Losses) | 6.4 | 5.2 |
Derivative Liabilities | LPCs |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 212.0 | 185.0 |
Fair Value - Liability | 1.3 | 0.7 |
Recorded Gains/(Losses) | 0.8 | 0.1 |
Derivative Liabilities | Treasury futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability |  | 63.0 |
Fair Value - Liability |  | 0.0 |
Recorded Gains/(Losses) |  | (1.4) |
Derivative Liabilities | Eurodollar futures |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding Notional - Liability | 12.0 | 6.0 |
Fair Value - Liability | 0.0 | 0.0 |
Recorded Gains/(Losses) | $ 0.0 | $ 0.0 |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Aggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References No definition available. + Details
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