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Commitments - Narrative (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Floating Rate Reverse Mortgage Loans [Member]  
Other Commitments [Line Items]  
Additional borrowing capacity to borrowers $ 1,500.0
Forward Mortgage Loan Interest Rate Lock Commitments [Member]  
Other Commitments [Line Items]  
Short-term commitments to lend 140.6
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]  
Other Commitments [Line Items]  
Short-term commitments to lend $ 33.0