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Mortgage Loans - Loan Commitments and Related Derivatives (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | $ 706.8 | $ 446.2
Best-efforts and mandatory commitments [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | 49.6 | 26.9
Hedging Instruments related to IRLCs [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | $ 610.4 | $ 389.3

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