Basis Of Presentation Basis Of Presentation (Policies)	3 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]
Business, Policy	TFS Financial Corporation, a federally chartered stock holding company, conducts its principal activities through its wholly owned subsidiaries. The principal line of business of the Company is retail consumer banking, including mortgage lending, deposit gathering and, to a much lesser extent, other financial services. As of December 31, 2022, approximately 81% of the Company’s outstanding shares were owned by the federally chartered mutual holding company, Third Federal Savings and Loan Association of Cleveland, MHC. The thrift subsidiary of TFS Financial Corporation is Third Federal Savings and Loan Association of Cleveland.
Basis of Accounting, Policy	The accounting and financial reporting policies followed by the Company conform in all material respects to U.S. GAAP and to general practices in the financial services industry. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for credit losses, the valuation of deferred tax assets, and the determination of pension obligations are particularly subject to change. The unaudited interim consolidated financial statements reflect all adjustments of a normal recurring nature which, in the opinion of management, are necessary to present fairly the consolidated financial condition of the Company at December 31, 2022, and its consolidated results of operations and cash flows for the periods presented. Such adjustments are the only adjustments reflected in the unaudited interim financial statements. In accordance with SEC Regulation S-X for interim financial information, these financial statements do not include certain information and footnote disclosures required for complete audited financial statements. The Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022 contains audited consolidated financial statements and related notes, which should be read in conjunction with the accompanying interim consolidated financial statements. The results of operations for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the fiscal year ending September 30, 2023 or for any other period. Effective October 1, 2020, the Company adopted ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, as amended, which replaces the incurred loss methodology with an expected loss methodology referred to as the CECL methodology. Refer to NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES for additional details. Per ASC 606, Revenue from Contracts with Customers, an entity is required to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to receive in exchange for those goods or services. Three of the Company's revenue streams within scope of Topic 606 are the sales of REO, interchange income, and deposit account and other transaction-based service fee income. Those streams are not material to the Company's consolidated financial statements and therefore quantitative information regarding these streams is not disclosed.
Loans and Allowance for Credit Losses, Nonaccrual Loan Status, Policy	When a loan is more than one month past due on its scheduled payments, the loan is considered 30 days or more past due, regardless of the number of days in each month.Loans are placed in non-accrual status when they are contractually 90 days or more past due. The number of days past due is determined by the number of scheduled payments that remain unpaid, assuming a period of 30 days between each scheduled payment. Loans with a partial charge-off are placed in non-accrual and will remain in non-accrual status until, at a minimum, the loss is recovered. Loans restructured in TDRs that were in non-accrual status prior to the restructurings and loans with forbearance plans that were subsequently modified in TDRs are reported in non-accrual status for a minimum of six months after restructuring. Loans restructured in TDRs with a high debt-to-income ratio at the time of modification are placed in non-accrual status for a minimum of 12 months. Additionally, home equity loans and lines of credit where the customer has a severely delinquent first mortgage loan and loans in Chapter 7 bankruptcy status where all borrowers have filed, and not reaffirmed or been dismissed, are placed in non-accrual status. Interest on loans in accrual status is recognized in interest income as it accrues, on a daily basis. Accrued interest on loans in non-accrual status is reversed by a charge to interest income and income is subsequently recognized only to the extent cash payments are received. The Company has elected not to measure an allowance for credit losses on accrued interest receivable amounts since amounts are written off timely. Cash payments on loans in non-accrual status are applied to the oldest scheduled, unpaid payment first. Cash payments on loans with a partial charge-off are applied fully to principal, then to recovery of the charged off amount prior to interest income being recognized, except cash payments may be applied to interest capitalized in a restructuring when collection of remaining amounts due is considered probable. A non-accrual loan is generally returned to accrual status when contractual payments are less than 90 days past due. However, a loan may remain in non-accrual status when collectability is uncertain, such as a TDR that has not met minimum payment requirements, a loan with a partial charge-off, a home equity loan or line of credit with a delinquent first mortgage greater than 90 days past due, or a loan in Chapter 7 bankruptcy status where all borrowers have filed, and have not reaffirmed or been dismissed. Charge-offs on residential mortgage loans, home equity loans and lines of credit, and construction loans are recognized when triggering events, such as foreclosure actions, short sales, or deeds accepted in lieu of repayment, result in less than full repayment of the amortized cost in the loans. Partial or full charge-offs are also recognized for the amount of credit losses on loans considered collateral-dependent when the borrower is experiencing financial difficulty as described by meeting the conditions below. •For residential mortgage loans, payments are greater than 180 days delinquent; •For home equity loans and lines of credit, and residential loans restructured in TDR, payments are greater than 90 days delinquent; •For all classes of loans restructured in a TDR with a high debt-to-income ratio at time of modification; •For all classes of loans, a sheriff sale is scheduled within 60 days to sell the collateral securing the loan; •For all classes of loans, all borrowers have been discharged of their obligation through a Chapter 7 bankruptcy; •For all classes of loans, within 60 days of notification, all borrowers obligated on the loan have filed Chapter 7 bankruptcy and have not reaffirmed or been dismissed; •For all classes of loans, a borrower obligated on a loan has filed bankruptcy and the loan is greater than 30 days delinquent; and •For all classes of loans, it becomes evident that a loss is probable. Collateral-dependent residential mortgage loans and construction loans are charged-off to the extent the amortized cost in the loan, net of anticipated mortgage insurance claims, exceeds the fair value, less estimated costs to dispose of the underlying property. Management can determine if the loan is uncollectible for reasons such as foreclosures exceeding a reasonable time frame and recommend a full charge-off. Home equity loans or lines of credit are charged-off to the extent the amortized cost in the loan plus the balance of any senior liens exceeds the fair value, less estimated costs to dispose of the underlying property, or management determines the collateral is not sufficient to satisfy the loan. A loan in any portfolio identified as collateral-dependent will continue to be reported as such until it is no longer considered collateral-dependent, is less than 30 days past due and does not have a prior charge-off. A loan in any portfolio that has a partial charge-off will continue to be individually evaluated for credit loss until, at a minimum, the loss has been recovered.
Loans and Allowance for Credit Losses, Impaired Loan, Policy	For all classes of loans, a loan is considered collateral-dependent when, based on current information and events, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale of the collateral or foreclosure is probable. Factors considered in determining that a loan is collateral-dependent may include the deteriorating financial condition of the borrower indicated by missed or delinquent payments, a pending legal action, such as bankruptcy or foreclosure, or the absence of adequate security for the loan.
Loans and Allowance for Credit Losses, Troubled Debt Restructuring, Policy	Residential mortgage loans, home equity loans and lines of credit and construction loans restructured in TDRs that are not evaluated based on collateral are separately evaluated for credit losses on a loan by loan basis at each reporting date for as long as they are reported as TDRs. The credit loss evaluation is based on the present value of expected future cash flows discounted at the effective interest rate of the original loan. Expected future cash flows include a discount factor representing a potential for default. Valuation allowances are recorded for the excess of the amortized costs over the result of the cash flow analysis. Loans discharged in Chapter 7 bankruptcy are reported as TDRs and also evaluated based on the present value of expected future cash flows unless evaluated based on collateral. These loans are evaluated using expected future cash flows because the borrower, not liquidation of the collateral, is expected to be the source of repayment for the loan. Other loans are not considered for restructuring.TDRs may be restructured more than once. Among other requirements, a subsequent restructuring may be available for a borrower upon the expiration of temporary restructuring terms if the borrower is unable to resume contractually scheduled loan payments. If the borrower is experiencing an income curtailment that temporarily has reduced their capacity to repay, such as loss of employment, reduction of work hours, non-paid leave or short-term disability, a temporary restructuring is considered. If the borrower lacks the capacity to repay the loan at the current terms due to a permanent condition, a permanent restructuring is considered. In evaluating the need for a subsequent restructuring, the borrower’s ability to repay is generally assessed utilizing a debt to income and cash flow analysis.
Loans and Allowance for Credit Losses, Policy or Methodology Change	The allowance for credit losses represents the estimate of lifetime losses in the loan portfolio and unfunded loan commitments. The allowance is estimated at each reporting date using relevant available information relating to past events, current conditions and supportable forecasts. The Company utilizes loan level regression models with forecasted economic data to derive the probability of default and loss given default factors. These factors are used to calculate the loan level credit loss over a 24-month period with an immediate reversion to historical mean loss rates for the remaining life of the loans. Historical credit loss experience provides the basis for the estimation of expected credit losses. Qualitative adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency status or likely recovery of previous loan charge-offs. Qualitative adjustments for expected changes in environmental conditions, such as changes in unemployment rates, property values or other relevant factors, are recognized when forecasted economic data used in the model differs from management's view or contains significant unobservable changes within a short period, particularly when those changes are directionally positive. Identifiable model limitations may also lead to qualitative adjustments, such as those made to reflect the expected recovery of loan amounts previously charged-off, beyond what the model is able to project.
Fair Value, Transfer, Policy	Under U.S. GAAP, fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date under current market conditions. A fair value framework is established whereby assets and liabilities measured at fair value are grouped into three levels of a fair value hierarchy, based on the transparency of inputs and the reliability of assumptions used to estimate fair value.

Basis Of Presentation Basis Of Presentation (Policies)

3 Months Ended

Dec. 31, 2022

TFS Financial Corporation, a federally chartered stock holding company, conducts its principal activities through its wholly owned subsidiaries. The principal line of business of the Company is retail consumer banking, including mortgage lending, deposit gathering and, to a much lesser extent, other financial services. As of December 31, 2022, approximately 81% of the Company’s outstanding shares were owned by the federally chartered mutual holding company, Third Federal Savings and Loan Association of Cleveland, MHC. The thrift subsidiary of TFS Financial Corporation is Third Federal Savings and Loan Association of Cleveland.

Basis of Accounting, Policy

The accounting and financial reporting policies followed by the Company conform in all material respects to U.S. GAAP and to general practices in the financial services industry. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for credit losses, the valuation of deferred tax assets, and the determination of pension obligations are particularly subject to change.

The unaudited interim consolidated financial statements reflect all adjustments of a normal recurring nature which, in the opinion of management, are necessary to present fairly the consolidated financial condition of the Company at December 31, 2022, and its consolidated results of operations and cash flows for the periods presented. Such adjustments are the only adjustments reflected in the unaudited interim financial statements.

In accordance with SEC Regulation S-X for interim financial information, these financial statements do not include certain information and footnote disclosures required for complete audited financial statements. The Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022 contains audited consolidated financial statements and related notes, which should be read in conjunction with the accompanying interim consolidated financial statements. The results of operations for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the fiscal year ending September 30, 2023 or for any other period.

Effective October 1, 2020, the Company adopted ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, as amended, which replaces the incurred loss methodology with an expected loss methodology referred to as the CECL methodology. Refer to NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES for additional details.

Per ASC 606, Revenue from Contracts with Customers, an entity is required to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to receive in exchange for those goods or services. Three of the Company's revenue streams within scope of Topic 606 are the sales of REO, interchange income, and deposit account and other transaction-based service fee income. Those streams are not material to the Company's consolidated financial statements and therefore quantitative information regarding these streams is not disclosed.

Loans and Allowance for Credit Losses, Nonaccrual Loan Status, Policy

When a loan is more than one month past due on its scheduled payments, the loan is considered 30 days or more past due, regardless of the number of days in each month.Loans are placed in non-accrual status when they are contractually 90 days or more past due. The number of days past due is determined by the number of scheduled payments that remain unpaid, assuming a period of 30 days between each scheduled payment. Loans with a partial charge-off are placed in non-accrual and will remain in non-accrual status until, at a minimum, the loss is recovered. Loans restructured in TDRs that were in non-accrual status prior to the restructurings and loans with forbearance plans that were subsequently modified in TDRs are reported in non-accrual status for a minimum of six months after restructuring. Loans restructured in TDRs with a high debt-to-income ratio at the time of modification are placed in non-accrual status for a minimum of 12 months. Additionally, home equity loans and lines of credit where the customer has a severely delinquent first mortgage loan and loans in Chapter 7 bankruptcy status where all borrowers have filed, and not reaffirmed or been dismissed, are placed in non-accrual status. Interest on loans in accrual status is recognized in interest income as it accrues, on a daily basis. Accrued interest on loans in non-accrual status is reversed by a charge to interest income and income is subsequently recognized only to the extent cash payments are received. The Company has elected not to measure an allowance for credit losses on accrued interest receivable amounts since amounts are written off timely. Cash payments on loans in non-accrual status are applied to the oldest scheduled, unpaid payment first. Cash payments on loans with a partial charge-off are applied fully to principal, then to recovery of the charged off amount prior to interest income being recognized, except cash payments may be applied to interest capitalized in a restructuring when collection of remaining amounts due is considered probable. A non-accrual loan is generally returned to accrual status when contractual payments are less than 90 days past due. However, a loan may remain in non-accrual status when collectability is uncertain, such as a TDR that has not met minimum payment requirements, a loan with a partial charge-off, a home equity loan or line of credit with a delinquent first mortgage greater than 90 days past due, or a loan in Chapter 7 bankruptcy status where all borrowers have filed, and have not reaffirmed or been dismissed.

Charge-offs on residential mortgage loans, home equity loans and lines of credit, and construction loans are recognized when triggering events, such as foreclosure actions, short sales, or deeds accepted in lieu of repayment, result in less than full repayment of the amortized cost in the loans.

Partial or full charge-offs are also recognized for the amount of credit losses on loans considered collateral-dependent when the borrower is experiencing financial difficulty as described by meeting the conditions below.

•For residential mortgage loans, payments are greater than 180 days delinquent;

•For home equity loans and lines of credit, and residential loans restructured in TDR, payments are greater than 90 days delinquent;

•For all classes of loans restructured in a TDR with a high debt-to-income ratio at time of modification;

•For all classes of loans, a sheriff sale is scheduled within 60 days to sell the collateral securing the loan;

•For all classes of loans, all borrowers have been discharged of their obligation through a Chapter 7 bankruptcy;

•For all classes of loans, within 60 days of notification, all borrowers obligated on the loan have filed Chapter 7 bankruptcy and have not reaffirmed or been dismissed;

•For all classes of loans, a borrower obligated on a loan has filed bankruptcy and the loan is greater than 30 days delinquent; and

•For all classes of loans, it becomes evident that a loss is probable.

Collateral-dependent residential mortgage loans and construction loans are charged-off to the extent the amortized cost in the loan, net of anticipated mortgage insurance claims, exceeds the fair value, less estimated costs to dispose of the underlying property. Management can determine if the loan is uncollectible for reasons such as foreclosures exceeding a reasonable time frame and recommend a full charge-off. Home equity loans or lines of credit are charged-off to the extent the amortized cost in the loan plus the balance of any senior liens exceeds the fair value, less estimated costs to dispose of the underlying property, or management determines the collateral is not sufficient to satisfy the loan. A loan in any portfolio identified as collateral-dependent will continue to be reported as such until it is no longer considered collateral-dependent, is less than 30 days past due and does not have a prior charge-off. A loan in any portfolio that has a partial charge-off will continue to be individually evaluated for credit loss until, at a minimum, the loss has been recovered.

Loans and Allowance for Credit Losses, Impaired Loan, Policy

For all classes of loans, a loan is considered collateral-dependent when, based on current information and events, the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale of the collateral or foreclosure is probable. Factors considered in determining that a loan is collateral-dependent may include the deteriorating financial condition of the borrower indicated by missed or delinquent payments, a pending legal action, such as bankruptcy or foreclosure, or the absence of adequate security for the loan.

Loans and Allowance for Credit Losses, Troubled Debt Restructuring, Policy

Residential mortgage loans, home equity loans and lines of credit and construction loans restructured in TDRs that are not evaluated based on collateral are separately evaluated for credit losses on a loan by loan basis at each reporting date for as long as they are reported as TDRs. The credit loss evaluation is based on the present value of expected future cash flows discounted at the effective interest rate of the original loan. Expected future cash flows include a discount factor representing a potential for default. Valuation allowances are recorded for the excess of the amortized costs over the result of the cash flow analysis. Loans discharged in Chapter 7 bankruptcy are reported as TDRs and also evaluated based on the present value of expected future cash flows unless evaluated based on collateral. These loans are evaluated using expected future cash flows because the borrower, not liquidation of the collateral, is expected to be the source of repayment for the loan. Other loans are not considered for restructuring.TDRs may be restructured more than once. Among other requirements, a subsequent restructuring may be available for a borrower upon the expiration of temporary restructuring terms if the borrower is unable to resume contractually scheduled loan payments. If the borrower is experiencing an income curtailment that temporarily has reduced their capacity to repay, such as loss of employment, reduction of work hours, non-paid leave or short-term disability, a temporary restructuring is considered. If the borrower lacks the capacity to repay the loan at the current terms due to a permanent condition, a permanent restructuring is considered. In evaluating the need for a subsequent restructuring, the borrower’s ability to repay is generally assessed utilizing a debt to income and cash flow analysis.

Loans and Allowance for Credit Losses, Policy or Methodology Change

The allowance for credit losses represents the estimate of lifetime losses in the loan portfolio and unfunded loan commitments. The allowance is estimated at each reporting date using relevant available information relating to past events, current conditions and supportable forecasts. The Company utilizes loan level regression models with forecasted economic data to derive the probability of default and loss given default factors. These factors are used to calculate the loan level credit loss over a 24-month period with an immediate reversion to historical mean loss rates for the remaining life of the loans. Historical credit loss experience provides the basis for the estimation of expected credit losses. Qualitative adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency status or likely recovery of previous loan charge-offs. Qualitative adjustments for expected changes in environmental conditions, such as changes in unemployment rates, property values or other relevant factors, are recognized when forecasted economic data used in the model differs from management's view or contains significant unobservable changes within a short period, particularly when those changes are directionally positive. Identifiable model limitations may also lead to qualitative adjustments, such as those made to reflect the expected recovery of loan amounts previously charged-off, beyond what the model is able to project.

Fair Value, Transfer, Policy

Under U.S. GAAP, fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date under current market conditions. A fair value framework is established whereby assets and liabilities measured at fair value are grouped into three levels of a fair value hierarchy, based on the transparency of inputs and the reliability of assumptions used to estimate fair value.