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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Mortgage loans held for sale | $ 1,438,900,000 | $ 1,529,000,000.0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities collateralized by residential real estate | 3,900,000 | 3,900,000
Mortgage loans held for sale | 1,429,500,000 | 1,518,300,000
Servicing Asset at Fair Value, Amount | 9,800,000 | 17,100,000
Fair Value, Recurring [Member] | Interest rate lock commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 26,400,000 | 31,300,000
Fair Value, Recurring [Member] | Forward sales of MBS [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | (38,500,000) | (16,200,000)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest rate lock commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Forward sales of MBS [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities collateralized by residential real estate | 0 | 0
Mortgage loans held for sale | 1,411,600,000 | 1,503,200,000
Servicing Asset at Fair Value, Amount | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest rate lock commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 26,400,000 | 31,300,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Forward sales of MBS [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | (38,500,000) | (16,200,000)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities collateralized by residential real estate | 3,900,000 | 3,900,000
Mortgage loans held for sale | 17,900,000 | 15,100,000
Servicing Asset at Fair Value, Amount | 9,800,000 | 17,100,000
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Measurement Input, Prepayment Rate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Servicing Asset at Fair Value, Amount | 0.11 | 0.13
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Servicing Asset at Fair Value, Amount | 0.11 | 0.11
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Measurement Input, Default Rate |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Servicing Asset at Fair Value, Amount | 0.05 | 0.05
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest rate lock commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Forward sales of MBS [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $ 0 | $ 0

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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