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Fair Value Measurements - Recurring (Details) - USD ($)
Jun. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale $ 1,502,600,000 $ 1,072,000,000.0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities collateralized by residential real estate 3,900,000 3,900,000
Mortgage loans held for sale 1,492,500,000 1,065,100,000
Servicing Asset at Fair Value, Amount 10,000,000.0  
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Interest rate lock commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 28,900,000 19,200,000
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Forward sales of MBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives (33,000,000.0) (4,100,000)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Best-efforts and mandatory commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives (700,000) (1,000,000.0)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities collateralized by residential real estate 0 0
Mortgage loans held for sale 0 0
Servicing Asset at Fair Value, Amount 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest rate lock commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Forward sales of MBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Best-efforts and mandatory commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities collateralized by residential real estate 0 0
Mortgage loans held for sale 1,474,800,000 1,055,300,000
Servicing Asset at Fair Value, Amount 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 28,900,000 19,200,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward sales of MBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives (33,000,000.0) (4,100,000)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Best-efforts and mandatory commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives (700,000) (1,000,000.0)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities collateralized by residential real estate 3,900,000 3,900,000
Mortgage loans held for sale 17,700,000 9,800,000
Servicing Asset at Fair Value, Amount 10,000,000.0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Default Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing Asset at Fair Value, Amount 0.05  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing Asset at Fair Value, Amount 0.13  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing Asset at Fair Value, Amount 0.11  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Forward sales of MBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Best-efforts and mandatory commitments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of interest rate derivatives $ 0 $ 0