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Commitments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017
Other Commitments [Line Items]
Loss on divestiture		$ 6.8
Floating Rate Reverse Mortgage Loans [Member]
Other Commitments [Line Items]
Additional borrowing capacity to borrowers		1,400.0
Forward Mortgage Loan Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Short-term commitments to lend		189.5
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Short-term commitments to lend		$ 17.3
Minimum [Member] | Scenario, Forecast [Member]
Other Commitments [Line Items]
Severance Costs	$ 1.0
Maximum [Member] | Scenario, Forecast [Member]
Other Commitments [Line Items]
Severance Costs	$ 2.0

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Amount of impairment loss from capitalized computer software costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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