Mercer Bancorp (MSBB) 10-K 29 Dec 23 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2023	Dec. 01, 2023	Mar. 31, 2023
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	000-56575
Entity Registrant Name	Mercer Bancorp, Inc.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	92-3452469
Entity Address, Address Line One	1100 Irmscher Blvd
Entity Address, City or Town	Celina
Entity Address State Or Province	OH
Entity Address, Postal Zip Code	45822
City Area Code	419
Local Phone Number	586-5158
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding		1,022,970
Entity Central Index Key	0001967306
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	SR Snodgrass
Auditor Location	Cranberry Township, Pennsylvania
Auditor Firm ID	74

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Assets
Cash and due from banks	$ 1,707,488	$ 1,361,198
Interest-bearing deposits in other financial institutions	4,583,848	13,015,520
Cash and cash equivalents	6,291,336	14,376,718
Interest-bearing time deposits	100,000	100,000
Available-for-sale securities	11,449,715	12,572,195
Held-to-maturity securities	147,291	233,388
Loans held for sale	3,094,405
Loans receivable	130,901,654	118,654,254
Allowance for loan losses	(934,331)	(983,654)
Net loans	129,967,323	117,670,600
Premises and equipment	2,601,575	2,608,291
Foreclosed real estate	54,000
Federal Home Loan Bank stock	1,368,900	1,390,200
Bank owned life insurance	1,783,880	1,742,464
Accrued interest receivable	456,867	376,903
Federal Home Loan Bank lender risk account	490,411	516,457
Deferred federal income taxes	407,304	272,051
Other assets	833,606	1,023,484
Total assets	159,046,613	152,882,751
Deposits
Demand	50,597,494	65,323,642
Savings and money market	39,900,297	44,168,770
Time	32,317,957	25,266,231
Total deposits	122,815,748	134,758,643
Advances from the Federal Home Loan Bank short term	11,000,000	1,000,000
Advances from the Federal Home Loan Bank long term	1,000,000	2,000,000
Directors plan liability	444,770	565,181
Accrued interest payable and other liabilities	1,001,470	502,597
Total liabilities	136,261,988	138,826,421
Shareholders' Equity
Preferred stock - authorized 1,000,000 shares of $0.01 par value, none issued	0	0
Common stock - authorized 9,000,000 shares of $0.01 par value, issued 1,022,970 shares at September 30, 2023	10,229
Additional paid-in capital	8,723,652
Shares acquired by ESOP	(818,380)
Retained earnings	15,729,450	14,959,892
Accumulated other comprehensive loss	(860,326)	(903,562)
Total shareholders' equity	22,784,625	14,056,330
Total liabilities and shareholders' equity	$ 159,046,613	$ 152,882,751

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical)	Sep. 30, 2023 $ / shares shares
Consolidated Balance Sheets
Preferred Stock, Shares Authorized	1,000,000
Preferred Stock Par Value | $ / shares	$ 0.01
Preferred Stock, Shares Issued	0
Common Stock, Shares Authorized	9,000,000
Common Stock, pat value | $ / shares	$ 0.01
Common Stock, Shares, Issued	1,022,970

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Interest Income
Loans	$ 5,376,255	$ 4,322,281
Investment securities	263,756	120,146
Interest-bearing deposits and other	362,502	152,532
Total interest income	6,002,513	4,594,959
Interest Expense
Deposits	485,306	232,587
Federal Home Loan Bank advances	114,566	32,292
Total interest expense	599,872	264,879
Net Interest Income	5,402,641	4,330,080
Provision for Loan Losses		25,000
Net Interest Income After Provision for Loan Losses	5,402,641	4,305,080
Noninterest Income
Service fees on deposits	317,324	327,785
Late charges and fees on loans	199,462	122,729
Gain on sale of loans	7,951	52,605
Loan servicing fees	44,496	48,030
Loss on sale of investments	(7,012)
Bank owned life insurance	58,819	53,126
Life insurance death benefits	4,514	169,069
Other income	19,801	21,057
Total noninterest income	645,355	794,401
Noninterest Expense
Salaries and employee benefits	2,197,427	2,074,632
Directors fees	91,900	84,250
Occupancy and equipment	452,674	340,113
Data processing fees	528,187	454,061
Franchise taxes	91,523	87,945
FDIC insurance premiums	60,279	41,510
Professional services	248,995	148,424
Deposit account services expense	248,977	239,797
Advertising	97,111	101,346
Loan expenses	101,743	77,210
Charitable contributions	617,900	21,650
Other	361,507	291,901
Total noninterest expense	5,098,223	3,962,839
Income before income taxes	949,773	1,136,642
Provision for income taxes	180,215	193,054
Net Income	$ 769,558	$ 943,588

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 769,558	$ 943,588
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for-sale securities	47,716	(1,202,519)
Reclassification adjustment for realized loss on sales of securities	7,012
Tax (expense) benefit	(11,492)	252,529
Other comprehensive income (loss)	43,236	(949,990)
Comprehensive income (loss)	$ 812,794	$ (6,402)

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Shares Acquired by ESOP	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Beginning balance at Sep. 30, 2021				$ 14,016,304	$ 46,428	$ 14,062,732
Net income				943,588		943,588
Other comprehensive loss / (income)					(949,990)	(949,990)
Ending balance at Sep. 30, 2022				14,959,892	(903,562)	14,056,330
Issuance of common stock	$ 10,229	$ 8,723,652	$ (818,380)			7,915,501
Net income				769,558		769,558
Other comprehensive loss / (income)					43,236	43,236
Ending balance at Sep. 30, 2023	$ 10,229	$ 8,723,652	$ (818,380)	$ 15,729,450	$ (860,326)	$ 22,784,625

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income	$ 769,558	$ 943,588
Items not requiring (providing) cash:
Depreciation and amortization	312,774	212,098
Amortization of premiums and discounts	52,852	113,250
Amortization of deferred loan fees	(72,384)	(109,681)
Deferred income taxes	(146,745)	(2,013)
Provision for loan losses		25,000
Gain on sale of loans	(7,951)	(52,605)
Proceeds from sales of loans	287,032	2,501,171
Loans originated for sale	(3,375,905)	(2,063,850)
Loss on sale of investment securities	7,012
Life insurance death benefits	(4,514)	(169,069)
Increase in cash surrender value of bank-owned life insurance	(58,819)	(53,126)
Changes in:
Accrued interest receivable	(79,964)	(57,215)
Other assets	207,594	(24,745)
Other liabilities	395,865	39,680
Net cash (used in) provided by operating activities	(1,713,595)	1,302,483
Investing Activities
Purchases of available-for-sale securities	(2,306,536)	(6,402,241)
Proceeds from sales of available-for-sale securites	1,654,746	0
Proceeds from calls, maturities and paydowns of available-for-sale securities	1,771,915	1,103,763
Principal repayments on securities held-to-maturity	83,316	101,252
Net change in loans	(12,296,339)	(5,074,840)
Purchase of premises and equipment	(295,309)	(382,742)
Proceeds from redemption of FHLB stock	320,000	215,100
Purchases of FHLB stock	(298,700)
Proceeds from sale of foreclosed real estate	18,000
Proceeds from death benefit of life insurance policies	4,514
Net cash used in investing activities	(11,344,393)	(10,439,708)
Financing Activities
Net (decrease) increase in deposit accounts	(11,942,895)	6,513,353
Proceeds from FHLB advances	13,500,000
Repayment of FHLB advances	(4,500,000)	(1,000,000)
Proceeds from issuance of common stock	7,915,501
Net cash provided by financing activities	4,972,606	5,513,353
Decrease in Cash and Cash Equivalents	(8,085,382)	(3,623,872)
Cash and Cash Equivalents, Beginning of Year	14,376,718	18,000,590
Cash and Cash Equivalents, End of Year	6,291,336	14,376,718
Supplemental Disclosure of Cash Flow Information
Interest on deposits and borrowings	533,216	265,929
Income taxes	171,979	$ 211,663
Supplemental Disclosure of Noncash Investing Activities
Transfers from loans to real estate acquired through foreclosure	$ 72,000

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2023
Nature of Operations and Summary of Significant Accounting Policies
Nature of Operations and Summary of Significant Accounting Policies	Note 1: Nature of Operations and Summary of Significant Accounting Policies Nature of Operations Mercer Bancorp, Inc. (“Mercer Bancorp” or the “Company”) is a Maryland corporation incorporated on March 7, 2023, to serve as the bank holding company for Mercer Savings Bank (“Mercer Savings” or the “Bank”) in connection with the Bank’s conversion from the mutual form of organization to the stock form of organization (the “Conversion”). The Conversion was completed on July 26, 2023. In connection with the Conversion, Mercer Bancorp acquired shares to a newly formed charitable foundation. The Bank’s employee stock ownership plan (“ESOP”) purchased Mercer Savings is an Ohio chartered stock bank engaged primarily in the business of providing a variety of deposit and lending services to individual customers in western Ohio. Its primary deposit products are checking, savings, and term certificate accounts, and its primary lending products are residential and commercial mortgage, commercial, home equity lines of credit and installment loans. Its operations are conducted through its Principles of Consolidation The consolidated financial statements as of and for the year ended September 30, 2023 include the accounts of Mercer Bancorp and its wholly-owned subsidiary, Mercer Savings. All intercompany transactions and balances have been eliminated in consolidation. The financial statements as of and for the year ended September 30, 2022 represent the Bank only, as the conversion to stock form, including the formation of Mercer Bancorp, was completed on July 26, 2023. References herein to the “Company” for periods prior to the completion of the stock conversion should be deemed to refer to the “Bank”. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, valuation of mortgage servicing rights and deferred tax assets and fair values of financial instruments. Cash Equivalents The Company considers all liquid investments with original maturities of three months or less to be cash equivalents. At September 30, 2023 and 2022, none of the Company’s cash accounts at nonfederal government or nongovernmental agencies exceeded FDIC insurance limits. In March 2020, the Federal Reserve's board of directors approved reducing the required reserve requirement ratios to zero percent, effectively eliminating the requirement to maintain reserve balances in cash or on deposit with the Federal Reserve Bank. This reduction in the required reserves does not have a defined timeframe and may be revised by the Federal Reserve's board in the future. Interest-bearing Time Deposits in Banks Interest-bearing time deposits have original maturities greater than one year at origination and are carried at cost. Debt Securities Debt securities held by the Company generally are classified and recorded in the financial statements as follows: Classified as Description Recorded at Held to maturity (“HTM”) Certain debt securities that management has the positive intent and ability to hold to maturity Amortized cost Trading Securities that are bought and held principally for the purpose of selling in the near term and, therefore, held for only a short period of time Fair value, with changes in fair value included in earnings Available for sale (“AFS”) Securities not classified as HTM or trading Fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income (loss) ​ Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities, identified as the call date as to premiums and maturity date as to discounts. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. When the fair value of securities is below amortized cost, the Company’s accounting treatment for an other-than-temporary impairment (“OTTI”) is as follows: ​ Accounting Treatment for OTTI Components Circumstances of Impairment Credit Remaining Considerations Component Portion Not intended for sale and more likely than not that the Bank will not have to sell before recovery of cost basis Recognized in earnings Recognized in other comprehensive income Intended for sale or more likely than not that the Bank will be required to sell before recovery of cost basis Recognized in earnings ​ For held-to-maturity debt securities, the amount of OTTI recorded in other comprehensive income for the noncredit portion of a previous OTTI is amortized prospectively over the remaining life of the security on the basis of the timing of future estimated cash flows of the security. When a credit loss component is separately recognized in earnings, the amount is identified as the total of principal cash flows not expected to be received over the remaining term of the security, as projected based on cash flow projections. The Company recognized no other-than-temporary impairments on debt securities in the years ended September 30, 2023 or 2022. Loans Held for Sale Mortgage and indirect auto loans originated and intended for sale in the secondary market are carried at the lower of cost or fair value in the aggregate. Net unrealized losses, if any, are recognized through a valuation allowance by charges to noninterest income. Gains and losses on loan sales are recorded in noninterest income, and direct loan origination costs and fees are deferred at origination of the loan and are recognized in noninterest income upon sale of the loan. Lender Risk Account (LRA) The Federal Home Loan Bank (FHLB) requires institutions participating in its mortgage loan sales program to place a portion of the sale proceeds in a lender risk account. The LRA is maintained to offset any credit losses associated with loans sold to the FHLB by the participating institution as well as losses experienced by the overall loan pool should an individual institution’s LRA be fully exhausted. The loan sale agreements provide for the FHLB to begin distributions of the LRA funds to the Company after loan pools have had five years of payment history. After five years, the required LRA balance is recalculated at least annually and excess amounts are returned to the participating institutions. Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding principal balances, adjusted for unearned income, charge-offs, the allowance for loan losses and any unamortized deferred fees or costs on originated loans and unamortized premiums or discounts on purchased loans. For loans amortized at cost, interest income is accrued based on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, as well as premiums and discounts, are deferred and amortized as a level yield adjustment over the respective term of the loan. For all loan portfolio segments except residential and consumer loans, the Bank promptly charges-off loans, or portions thereof, when available information confirms that specific loans are uncollectible based on information that includes, but is not limited to, (1) the deteriorating financial condition of the borrower, (2) declining collateral values, and/or (3) legal action, including bankruptcy, that impairs the borrower’s ability to adequately meet its obligations. For impaired loans that are considered to be solely collateral dependent, a partial charge-off is recorded when a loss has been confirmed by an updated appraisal or other appropriate valuation of the collateral. The Bank recognizes a loan charge-off, or portion thereof, when management reasonably determines the amount of the loss. The Bank adheres to delinquency thresholds established by applicable regulatory guidance to determine the charge-off timeframe for these loans. Loans at these delinquency thresholds for which the Bank can clearly document that the loan is both well-secured and in the process of collection, such that collection will occur regardless of delinquency status, need not be charged off. For all classes, all interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash basis or cost recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. The Bank requires a period of satisfactory performance of not less than six months before returning a nonaccrual loan to accrual status. When cash payments are received on impaired loans, the Bank records the payment as interest income unless collection of the remaining recorded principal amount is doubtful, at which time payments are used to reduce the principal balance of the loan. Troubled debt restructured loans recognize interest income on an accrual basis at the renegotiated rate if the loan is in compliance with the modified terms, no principal reduction has been granted and the loan has demonstrated the ability to perform in accordance with the renegotiated terms for a period of at least six months. Allowance for Loan Losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the collectibility of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is evaluated on a quarterly basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. The allowance consists of allocated and general components. The allocated component relates to loans that are classified as impaired. For those loans that are classified as impaired, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers nonimpaired loans and is based on historical charge-off experience by segment. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Bank over the prior three years. Management believes the three-year historical loss experience methodology is appropriate in the current economic environment. Other adjustments (qualitative/environmental considerations) for each segment may be added to the allowance for each loan segment after an assessment of internal or external influences on credit quality that are not fully reflected in the historical loss or risk rating data. A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment history and the probability of collecting scheduled principal and interest payments when due, based on the loan’s current payment status and the borrower’s financial condition, including available sources of cash flows. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is generally measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price or the fair value of the collateral if the loan is collateral dependent. For impaired loans where the Bank utilizes the discounted cash flows to determine the level of impairment, the Bank includes the entire change in the present value of cash flows as a provision for loan losses. The fair values of collateral dependent impaired loans are based on independent appraisals of the collateral. In general, the Bank acquires an updated appraisal upon identification of impairment and annually thereafter for commercial, commercial real estate and multi-family loans. If the most recent appraisal is over a year old, and a new appraisal is not performed, due to lack of comparable values or other reasons, the existing appraisal is utilized and discounted based on the age of the appraisal, condition of the subject property and overall economic conditions. After determining the collateral value as described, the fair value is calculated based on the determined collateral value less selling expenses. The potential for outdated appraisal values is considered in our determination of the allowance for loan losses through our analysis of various trends and conditions including the local economy, trends in charge-offs and delinquencies and the related qualitative adjustments assigned by the Bank. Segments of loans with similar risk characteristics are collectively evaluated for impairment based on the segment’s historical loss experience adjusted for changes in trends, conditions and other relevant factors that affect repayment of the loans. In the course of working with borrowers, the Bank may choose to restructure the contractual terms of certain loans. In this scenario, the Bank attempts to work out an alternative payment schedule with the borrower in order to optimize collectibility of the loan. Any loans that are modified are reviewed by the Bank to identify if a troubled debt restructuring (“TDR”) has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with the borrower’s current financial status, and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms or a combination of the two. If such efforts by the Bank do not result in a satisfactory arrangement, the loan is referred to legal counsel, at which time foreclosure proceedings are initiated. At any time prior to a sale of the property at foreclosure, the Bank may terminate foreclosure proceedings if the borrower is able to work out a satisfactory payment plan. It is the Bank’s policy that any restructured loans on nonaccrual status prior to being restructured remain on nonaccrual status until six months of satisfactory borrower performance, at which time management would consider its return to accrual status. If a loan was accruing at the time of restructuring, the Bank reviews the loan to determine if it is appropriate to continue the accrual of interest on the restructured loan. With regard to determination of the amount of the allowance for loan losses, troubled debt restructured loans are considered to be impaired. As a result, the determination of the amount of impaired loans for each portfolio segment within troubled debt restructurings is the same as detailed previously. Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Bank, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Bank does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity. Premises and Equipment Depreciable assets are stated at cost less accumulated depreciation. Depreciation is charged to expense using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of depreciable assets are as follows: building and improvements are 5-40 years; furniture and fixtures are 5-10 years; information technology-related equipment is 3-5 years. Servicing Assets When mortgage loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on market prices for comparable mortgage servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Servicing assets are included in other assets on the consolidated balance sheets. Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If the Bank later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. No changes in valuation allowances have been reported on the income statements. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the consolidated income statement as other noninterest income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal; or a fixed amount per loan and are recorded as income when earned. The amortization of mortgage servicing rights is netted against loan servicing fee income. Federal Home Loan Bank Stock Federal Home Loan Bank (“FHLB”) stock is a required investment for institutions that are members of the FHLB system and the transfer of the stock is substantially restricted. The required investment in the common stock is based on a predetermined formula. FHLB stock is carried at cost. FHLB stock is evaluated for impairment on an annual basis. The Bank’s investment in FHLB stock was not impaired at September 30, 2023 and 2022. Bank Owned Life Insurance The Bank has purchased life insurance on directors. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Foreclosed Assets Held for Sale Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value less cost to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in net income or expense from foreclosed assets. At September 30, 2022, the Bank had no foreclosed residential real estate properties. At September 30, 2023, the Bank had two consumer mortgage loans secured by residential real estate properties totaling $136,000 for which formal foreclosure proceedings are in process. At September 30, 2022, the Bank had no consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process. Income Taxes The Company accounts for income taxes in accordance with income tax accounting guidance (Accounting Standards Codification (“ASC”) 740, Income Taxes Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized. Tax positions are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances and information available at the reporting date and is subject to management’s judgment. If necessary, the Company recognizes interest and penalties on income taxes as a component of income tax expense. With a few exceptions, the Company is no longer subject to examination by tax authorities for calendar years before 2020. As of September 30, 2023 and 2022, the Company had no material uncertain income tax positions. Employee Stock Ownership Plan (ESOP) The cost of shares issued to the Employee Stock Ownership Plan (“ESOP”), but not yet allocated to participants, is shown as a reduction of shareholders’ equity. Compensation expense is based on the average fair value of shares as they are committed to be released to participant accounts. Earnings Per Share Basic earnings per share is calculated by dividing net income by the weighted-average number of common shares outstanding during the year. Unallocated common shares held by the ESOP are shown as a reduction in shareholders’ equity and are excluded from weighted-average common shares outstanding for both basic and diluted earnings per share calculations until they are committed to be released. The Company had no dilutive or potentially dilutive securities during the year ended September 30, 2023. Earnings per share is not meaningful to the fiscal year ended September 30, 2023, as the Company completed the stock offering and conversion to stock form on July 26, 2023. Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss), net of applicable income taxes. Other comprehensive income (loss) includes unrealized appreciation (depreciation) on available-for-sale securities and, if necessary, unrealized appreciation (depreciation) on available-for-sale securities for which a portion of an other-than-temporary impairment has been recognized in income. Accumulated other comprehensive loss consists solely of the cumulative unrealized gains and losses on available-for-sale securities, net of tax. Revenue Recognition The Company accounts for certain revenues in accordance with Accounting Standards Update (“ASU”) 2014-09 Revenue from Contracts with Customers Deposit Services. For deposit-related services, revenue is recognized when performance obligations are satisfied, which is, generally, at a point in time.

Future Change in Accounting Pri

Future Change in Accounting Principle	12 Months Ended
	Sep. 30, 2023
Future Change in Accounting Principle
Future Change in Accounting Principle	Note 2: Future Change in Accounting Principle The FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326) The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses for loans, held-to-maturity securities and other receivables at the time the financial asset is originated or acquired. The expected credit losses are adjusted each period for changes in expected lifetime credit losses. For available-for-sale securities where fair value is less than cost, credit-related impairment, if any, will be recognized in an allowance for credit losses and adjusted each period for changes in expected credit risk. This model replaces the existing impairment models, which generally require that a loss be incurred before it is recognized. The CECL model represents a significant change from existing practice and may result in material changes to the Company’s accounting for financial instruments. The Company is evaluating the effect ASU 2016-13 will have on its financial statements and related disclosures. The impact of the ASU will depend upon the state of the economy and the nature of our portfolios at the date of adoption. The new standard is effective for fiscal years beginning after December 15, 2022, or October 1, 2023 as to the Company, including interim periods within those fiscal years. The Company has finalized the methodology determination, software models, quantitative framework, and policies and procedures for how to determine expected credit losses under the new guidance. Management is finalizing the qualitative component of CECL calculation, reviewing internal procedures, policies, and assumptions.

Debt Securities

Debt Securities	12 Months Ended
	Sep. 30, 2023
Debt Securities
Debt Securities	Note 3: Debt Securities The amortized cost and fair values, together with gross unrealized gains and losses of securities are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ ​ Cost ​ Gains ​ Losses ​ Fair Value Available-for-sale Securities: ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 999,565 ​ $ — ​ $ (32,845) ​ $ 966,720 U.S. Government agencies ​ 4,009,577 ​ — ​ (184,807) ​ 3,824,770 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,647,020 ​ — ​ (414,789) ​ 3,232,231 State and political subdivisions ​ 3,882,574 ​ — ​ (456,580) ​ 3,425,994 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 12,538,736 ​ $ — ​ $ (1,089,021) ​ $ 11,449,715 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ Cost Gains Losses Fair Value Available-for-sale Securities: ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ U.S. Treasury securities ​ $ 2,008,695 ​ $ — ​ $ (84,242) ​ $ 1,924,453 U.S. Government agencies ​ 4,025,948 ​ — ​ (227,874) ​ 3,798,074 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 4,191,085 ​ — ​ (395,205) ​ 3,795,880 State and political subdivisions ​ 3,490,216 ​ 201 ​ (436,629) ​ 3,053,788 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 13,715,944 ​ $ 201 ​ $ (1,143,950) ​ $ 12,572,195 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ Cost Gains Losses Fair Value Held-to-maturity Securities: ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 147,291 ​ $ — ​ $ (4,149) ​ $ 143,142 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 233,388 ​ $ — ​ $ (5,304) ​ $ 228,084 ​ The amortized cost and fair value of available-for-sale securities at September 30, 2023, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ Fair ​ Cost Value September 30, 2023 ​ ​ Within one year ​ $ 1,999,723 ​ $ 1,955,480 One to five years ​ 3,461,141 ​ 3,258,385 Five to ten years ​ — ​ — After ten years ​ 3,430,852 ​ 3,003,619 ​ ​ 8,891,716 ​ 8,217,484 Mortgage-backed GSEs ​ 3,647,020 ​ 3,232,231 Totals ​ $ 12,538,736 ​ $ 11,449,715 ​ The carrying value of securities pledged as collateral, to secure public deposits and for other purposes, was approximately $468,000 and $460,000 at September 30, 2023 and 2022, respectively. Proceeds from sales of available for sale securities totaled approximately $1,655,000 during the fiscal year ended September 30, 2023, resulting in gross realized gains of $5,735 and gross realized losses of $12,747 . There were Certain investments in debt securities are reported in the financial statements at an amount less than their historical cost. Total fair value of these investments, comprised of 28 and 29 securities at September 30, 2023 and 2022, respectively, was approximately $11,450,000 and $12,572,000, which is approximately 100 percent and 98 percent, respectively, of the fair value of the Company’s total investment portfolio. These declines primarily resulted from changes in market interest rates. Based on evaluation of available evidence, including recent changes in market interest rates and information obtained from regulatory filings, management believes the declines in fair value for these securities are temporary. Should the impairment of any of these securities become other than temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income in the period the other-than-temporary impairment is identified. The following tables show the Company’s investments’ gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment class and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized Description of Securities Value Losses Value Losses Value Losses Available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ — ​ $ — ​ $ 966,720 ​ $ (32,845) ​ $ 966,720 ​ $ (32,845) U.S. Government agencies ​ — ​ — ​ 3,824,770 ​ (184,807) ​ 3,824,770 ​ (184,807) Mortgage-backed Government Sponsored Enterprises (GSEs) ​ — ​ — ​ 3,232,231 ​ (414,789) ​ 3,232,231 ​ (414,789) State and political subdivisions ​ 1,481,544 ​ (71,136) ​ 1,944,450 ​ (385,444) ​ 3,425,994 ​ (456,580) ​ ​ 1,481,544 ​ (71,136) ​ 9,968,171 ​ (1,017,885) ​ 11,449,715 ​ (1,089,021) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ — ​ — ​ 143,142 ​ (4,149) ​ 143,142 ​ (4,149) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 1,481,544 ​ $ (71,136) ​ $ 10,111,313 ​ $ (1,022,034) ​ $ 11,592,857 ​ $ (1,093,170) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized Description of Securities Value Losses Value Losses Value Losses Available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ — ​ $ — ​ $ 1,924,453 ​ $ (84,242) ​ $ 1,924,453 ​ $ (84,242) U.S. Government agencies ​ 1,924,522 ​ (98,137) ​ 1,873,552 ​ (129,737) ​ 3,798,074 ​ (227,874) Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,110,636 ​ (291,370) ​ 685,244 ​ (103,835) ​ 3,795,880 ​ (395,205) State and political subdivisions ​ 2,822,544 ​ (436,629) ​ — ​ — ​ 2,822,544 ​ (436,629) ​ ​ 7,857,702 ​ (826,136) ​ 4,483,249 ​ (317,814) ​ 12,340,951 ​ (1,143,950) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 228,071 ​ (5,304) ​ — ​ — ​ 228,071 ​ (5,304) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 8,085,773 ​ $ (831,440) ​ $ 4,483,249 ​ $ (317,814) ​ $ 12,569,022 ​ $ (1,149,254) ​ U.S. Government Treasuries and Agencies and State and Political Subdivisions Unrealized losses on these securities have not been recognized because the issuers’ bonds are of high credit quality, values have only been impacted by changes in interest rates since the securities were purchased, and the Company has the intent and ability to hold the securities for the foreseeable future. The fair value is expected to recover as the bonds approach the maturity date. Because the decline in market value was attributable to changes in interest rates, and not credit quality, and because the Company typically does not intend to sell the investments and it is not more likely than not the Company will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Company did not consider those investments to be other-than-temporarily impaired at September 30, 2023 and 2022. Mortgage-backed GSEs The unrealized losses on the Company’s investment in residential mortgage-backed government sponsored enterprises were caused primarily by changes in interest rates. The Company expects to recover the amortized cost basis over the term of the securities. Because the decline in market value is attributable to changes in interest rates, and not credit quality, and because the Company typically does not intend to sell the investments and it is not more likely than not the Company will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Company did not consider those investments to be other-than-temporarily impaired at September 30, 2023 and 2022.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Sep. 30, 2023
Loans and Allowance for Loan Losses
Loans and Allowance for Loan Losses	Note 4: Loans and Allowance for Loan Losses Categories of loans were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Real estate loans: ​ ​ ​ Residential ​ $ 74,561,278 ​ $ 78,311,447 Multi-family ​ 1,309,586 ​ 1,356,547 Agricultural ​ 36,378,192 ​ 28,516,448 Commercial ​ 2,311,882 ​ 1,790,159 Construction and land ​ 5,082,863 ​ 3,609,744 Home equity line of credit (HELOC) ​ 4,708,023 ​ 5,174,912 Commercial and industrial ​ 1,801,569 ​ 1,833,194 Consumer ​ 7,652,164 ​ 925,901 ​ ​ ​ ​ ​ ​ ​ Total loans ​ 133,805,557 ​ 121,518,352 ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ Undisbursed loans in process ​ 2,578,282 ​ 2,529,981 Net deferred loan fees ​ 325,621 ​ 334,117 Allowance for loan losses ​ 934,331 ​ 983,654 ​ ​ ​ ​ ​ ​ ​ Net loans ​ $ 129,967,323 ​ $ 117,670,600 ​ Indirect auto loans included in the consumer loan category totaled approximately $6.8 million at September 30, 2023. Mortgage loans serviced for others are not included in the accompanying consolidated balance sheets. The unpaid principal balances of these loans at September 30, 2023 and 2022, were approximately $19,667,000 and $21,123,000 , respectively. At September 30, 2023 and 2022, the mortgage-servicing rights included in other assets on the balance sheets were approximately The following tables present the activity in the allowance for loan losses based on portfolio segment for the years ended September 30, 2023 and 2022. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended September 30, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2022 for loan losses Charge-offs Recoveries September 30, 2023 Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 623,649 ​ $ 163,934 ​ $ (49,353) ​ $ — ​ $ 738,230 Multi-family ​ 11,008 ​ 1,832 ​ — ​ — ​ 12,840 Agricultural ​ 199,011 ​ (125,403) ​ — ​ — ​ 73,608 Commercial ​ 10,801 ​ (6,123) ​ — ​ — ​ 4,678 Construction and land ​ 35,292 ​ 14,543 ​ — ​ — ​ 49,835 Home equity line of credit (HELOC) ​ 69,234 ​ (54,945) ​ — ​ — ​ 14,289 Commercial and industrial ​ 12,086 ​ (8,441) ​ — ​ — ​ 3,645 Consumer ​ 22,573 ​ 14,603 ​ — ​ 30 ​ 37,206 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 983,654 ​ $ — ​ $ (49,353) ​ $ 30 ​ $ 934,331 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended September 30, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2021 for loan losses Charge-offs Recoveries September 30, 2022 Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 627,259 ​ $ (3,610) ​ $ — ​ $ — ​ $ 623,649 Multi-family ​ 9,983 ​ 1,025 ​ — ​ — ​ 11,008 Agricultural ​ 210,632 ​ (11,621) ​ — ​ — ​ 199,011 Commercial ​ 12,491 ​ (1,690) ​ — ​ — ​ 10,801 Construction and land ​ 31,908 ​ 3,384 ​ — ​ — ​ 35,292 Home equity line of credit (HELOC) ​ 39,716 ​ 29,518 ​ — ​ — ​ 69,234 Commercial and industrial ​ 12,255 ​ (169) ​ — ​ — ​ 12,086 Consumer ​ 13,659 ​ 8,163 ​ — ​ 751 ​ 22,573 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 957,903 ​ $ 25,000 ​ $ — ​ $ 751 ​ $ 983,654 ​ The following tables present the balance in the allowance for loan losses and the recorded investment in loans based on portfolio segment and impairment method as of September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ Loans ​ ​ Ending balance, evaluated for impairment ​ Ending balance, evaluated for impairment ​ Individually Collectively Individually Collectively ​ ​ (In thousands) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 738,230 ​ $ — ​ $ 74,561,278 Multi-family ​ — ​ 12,840 ​ — ​ 1,309,586 Agricultural ​ — ​ 73,608 ​ — ​ 36,378,192 Commercial ​ — ​ 4,678 ​ — ​ 2,311,882 Construction and land ​ — ​ 49,835 ​ — ​ 5,082,863 Home equity line of credit (HELOC) ​ — ​ 14,289 ​ — ​ 4,708,023 Commercial and industrial ​ — ​ 3,645 ​ — ​ 1,801,569 Consumer ​ — ​ 37,206 ​ — ​ 7,652,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 934,331 ​ $ — ​ $ 133,805,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ Loans ​ ​ Ending balance, evaluated for impairment ​ Ending balance, evaluated for impairment ​ Individually Collectively Individually Collectively ​ ​ (In thousands) September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 623,649 ​ $ — ​ $ 78,311,447 Multi-family ​ — ​ 11,008 ​ — ​ 1,356,547 Agricultural ​ — ​ 199,011 ​ — ​ 28,516,448 Commercial ​ — ​ 10,801 ​ — ​ 1,790,159 Construction and land ​ — ​ 35,292 ​ — ​ 3,609,744 Home equity line of credit (HELOC) ​ — ​ 69,234 ​ — ​ 5,174,912 Commercial and industrial ​ — ​ 12,086 ​ — ​ 1,833,194 Consumer ​ — ​ 22,573 ​ — ​ 925,901 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 983,654 ​ $ — ​ $ 121,518,352 ​ The Company has adopted a standard loan grading system for all loans, as follows: Pass. Special Mention. Loans have potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the Bank's credit position at some future date. Substandard. Loans which are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. Usually, this classification includes all 90 days or more, non-accrual, and past due loans Doubtful. Loss Risk characteristics of each loan portfolio segment are described as follows: Residential Real Estate These loans include first liens and junior liens on 1-4 family residential real estate (both owner and non-owner occupied). The main risks for these loans are changes in the value of the collateral and stability of the local economic environment and its impact on the borrowers' employment. Management specifically considers unemployment and changes in real estate values in the Company's market area. Multi-family Real Estate These loans include loans on residential real estate secured by property with five or more units. The main risks are changes in the value of the collateral, ability of borrowers to collect rents, vacancy and changes in the tenants' employment status. Management specifically considers unemployment and changes in real estate values in the Company's market area. Agriculture Real Estate These loans are primarily loans on farm ground and include loans secured by residential properties located on farm ground, but agricultural activities may not be the primary occupation of the borrowers. The main risks are changes in the value of the collateral and changes in the economy or borrowers' business operations. Management specifically considers unemployment and changes in real estate values in the Company's market area. Commercial Real Estate These loans are generally secured by owner-occupied commercial real estate including warehouses and offices. The main risks are changes in the value of the collateral and ability of borrowers to successfully conduct their business operations. Management specifically considers unemployment and changes in real estate values in the Company’s market area. Construction and Land Real Estate These loans include construction loans for 1-4 family residential and commercial properties (both owner and non-owner occupied) and first liens on land. The main risks for construction loans include uncertainties in estimating costs of construction and in estimating the market value of the completed project. The main risks for land loans are changes in the value of the collateral and stability of the local economic environment. Management specifically considers unemployment and changes in real estate values in the Company’s market area. HELOC These loans are generally secured by owner-occupied 1-4 family residences. The main risks for these loans are changes in the value of the collateral and stability of the local economic environment and its impact on the borrowers’ employment. Management specifically considers unemployment and changes in real estate values in the Company’s market area. Commercial and Industrial The commercial and industrial portfolio includes loans to commercial customers for use in financing working capital needs, equipment purchases and expansions. The loans in this category are repaid primarily from the cash flow of a borrower’s principal business operation. Credit risk in these loans is driven by creditworthiness of the borrower and the economic conditions that impact the cash flow stability from business operations. Consumer Loans These loans include vehicle loans, share loans and unsecured loans. The main risks for these loans are the depreciation of the collateral values (vehicles) and the financial condition of the borrowers. Major employment changes are specifically considered by management. Information regarding the credit quality indicators most closely monitored for other than residential real estate loans by class as of September 30, 2023 and 2022, follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 74,083,965 ​ $ — ​ $ 477,313 ​ $ — ​ $ 74,561,278 Multi-family ​ 1,309,586 ​ — ​ — ​ — ​ 1,309,586 Agricultural ​ 36,378,192 ​ — ​ — ​ — ​ 36,378,192 Commercial ​ 2,311,882 ​ — ​ — ​ — ​ 2,311,882 Construction and land ​ 5,082,863 ​ — ​ — ​ — ​ 5,082,863 Home equity line of credit (HELOC) ​ 4,708,023 ​ — ​ — ​ — ​ 4,708,023 Commercial and industrial ​ 1,801,569 ​ — ​ — ​ — ​ 1,801,569 Consumer ​ 7,652,164 ​ — ​ — ​ — ​ 7,652,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 133,328,244 ​ $ — ​ $ 477,313 ​ $ — ​ $ 133,805,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 77,964,201 ​ $ — ​ $ 347,246 ​ $ — ​ $ 78,311,447 Multi-family ​ 1,356,547 ​ — ​ — ​ — ​ 1,356,547 Agricultural ​ 28,516,448 ​ — ​ — ​ — ​ 28,516,448 Commercial ​ 1,790,159 ​ — ​ — ​ — ​ 1,790,159 Construction and land ​ 3,609,744 ​ — ​ — ​ — ​ 3,609,744 Home equity line of credit (HELOC) ​ 5,174,912 ​ — ​ — ​ — ​ 5,174,912 Commercial and industrial ​ 1,833,194 ​ — ​ — ​ — ​ 1,833,194 Consumer ​ 923,401 ​ — ​ 2,500 ​ — ​ 925,901 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,168,606 ​ $ — ​ $ 349,746 ​ $ — ​ $ 121,518,352 ​ The Company evaluates the loan risk grading system definitions and allowance for loan losses methodology on an ongoing basis. No significant changes were made to either during the years ended September 30, 2023 and 2022. The following tables present the Company’s loan portfolio aging analysis of the recorded investment in loans as of September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ ​ ​ Greater Than ​ ​ ​ ​ ​ ​ ​ Total Loans > ​ ​ 30-59 Days ​ 60-89 Days ​ 90 Days ​ Total ​ ​ ​ Total Loans ​ 90 Days & ​ Past Due Past Due Past Due Past Due Current Receivable Accruing Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 482,844 ​ $ 332,929 ​ $ 477,313 ​ $ 1,293,086 ​ $ 73,268,192 ​ $ 74,561,278 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,309,586 ​ 1,309,586 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 36,378,192 ​ 36,378,192 ​ — Commercial ​ — ​ — ​ — ​ — ​ 2,311,882 ​ 2,311,882 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 5,082,863 ​ 5,082,863 ​ — Home equity line of credit (HELOC) ​ — ​ — ​ — ​ — ​ 4,708,023 ​ 4,708,023 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,801,569 ​ 1,801,569 ​ — Consumer ​ 5,653 ​ 20,831 ​ — ​ 26,484 ​ 7,625,680 ​ 7,652,164 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 488,497 ​ $ 353,760 ​ $ 477,313 ​ $ 1,319,570 ​ $ 132,485,987 ​ $ 133,805,557 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ ​ ​ Greater Than ​ ​ ​ ​ ​ ​ ​ Total Loans > ​ ​ 30-59 Days ​ 60-89 Days ​ 90 Days ​ Total ​ ​ ​ Total Loans ​ 90 Days & ​ Past Due Past Due Past Due Past Due Current Receivable Accruing Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 270,843 ​ $ 65,100 ​ $ 347,246 ​ $ 683,189 ​ $ 77,628,258 ​ $ 78,311,447 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,356,547 ​ 1,356,547 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 28,516,448 ​ 28,516,448 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,790,159 ​ 1,790,159 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 3,609,744 ​ 3,609,744 ​ — Home equity line of credit (HELOC) ​ 143,983 ​ — ​ — ​ 143,983 ​ 5,030,929 ​ 5,174,912 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,833,194 ​ 1,833,194 ​ — Consumer ​ — ​ — ​ 2,500 ​ 2,500 ​ 923,401 ​ 925,901 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 414,826 ​ $ 65,100 ​ $ 349,746 ​ $ 829,672 ​ $ 120,688,680 ​ $ 121,518,352 ​ $ — ​ The Company had no loans identified as impaired as of September 30, 2023 and 2022, and no loans identified as impaired during the years ended September 30, 2023 and 2022. Nonaccrual loans at September 30, 2023 and 2022, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 ​ ​ ​ ​ ​ ​ ​ Residential real estate loans ​ $ 477,313 ​ $ 347,246 Consumer ​ — ​ 2,500 ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 477,313 ​ $ 349,746 ​ There were no loans modified in a troubled debt restructuring during the years ended September 30, 2023 and 2022. There were no troubled debt restructurings modified in the past 12 months that subsequently defaulted during the years ended September 30, 2023 and 2022.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Sep. 30, 2023
Premises and Equipment
Premises and Equipment	Note 5: Premises and Equipment Major classifications of premises and equipment, stated at cost, at September 30, 2023 and 2022, are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Land ​ $ 483,570 ​ $ 483,570 Buildings and improvements ​ 4,261,697 ​ 4,247,815 Furniture and equipment ​ 1,621,935 ​ 1,534,124 ​ ​ ​ ​ ​ ​ ​ ​ ​ 6,367,202 ​ 6,265,509 Less accumulated depreciation ​ 3,765,627 ​ 3,657,218 ​ ​ ​ ​ ​ ​ ​ Net premises and equipment ​ $ 2,601,575 ​ $ 2,608,291 ​ Depreciation expense was approximately $302,000 and $190,000 for the years ended September 30, 2023 and 2022, respectively.

Time Deposits

Time Deposits	12 Months Ended
	Sep. 30, 2023
Time Deposits.
Time Deposits	Note 6: Time Deposits Time deposits in denominations of $250,000 or more were $3,663,331 and $2,195,000 at September 30, 2023 and 2022, respectively. At September 30, 2023, the scheduled maturities of time deposits were as follows: ​ ​ ​ ​ ​ ​ September 30, ​ ​ 2023 Within one year ​ $ 26,619,426 One year to two years ​ 4,246,879 Two years to three years ​ 594,876 Three years to four years ​ 405,846 Four years to five years ​ 450,930 ​ ​ ​ ​ ​ ​ $ 32,317,957 ​

Borrowings

Borrowings	12 Months Ended
	Sep. 30, 2023
Borrowings
Borrowings	Note 7: Borrowings The Bank had Federal Home Loan Bank (FHLB) advances outstanding totaling $12,000,000 and $3,000,000 as of September 30, 2023 and 2022, respectively. The Bank has made a collateral pledge to the FHLB consisting of all shares of FHLB stock owned by the Bank and a blanket pledge of approximately $74,469,000 of its qualifying mortgage assets as of September 30, 2023. Based on this collateral, the Bank was eligible to borrow up to a total of approximately $37,603,000 as of September 30, 2023. Maturities of FHLB advances were as follows at September 30, 2023: ​ ​ ​ ​ ​ ​ September 30, ​ ​ 2023 Within one year (weighted average rate 5.02%) ​ $ 11,000,000 One year to two years (weighted average rate 1.11%) ​ 1,000,000 ​ ​ ​ ​ ​ ​ $ 12,000,000 ​ At September 30 2023 and 2022, the Bank had a cash management line of credit agreement with the FHLB providing for additional borrowing of $10 million. The Bank had no outstanding borrowings on this line at September 30 2023 and 2022.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2023
Income Taxes
Income Taxes	Note 8: Income Taxes The provision for income taxes includes these components for the years ended September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Taxes currently payable ​ $ 326,960 ​ $ 195,067 Deferred income taxes ​ (146,745) ​ (2,013) ​ ​ ​ ​ ​ ​ ​ Income tax expense ​ $ 180,215 ​ $ 193,054 ​ A reconciliation of the federal income tax expense at the statutory rate to the Company’s actual income tax expense is shown below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ % of Pretax ​ ​ ​ ​ % of Pretax ​ ​ ​ Amount Income ​ ​ ​ Amount Income Computed at statutory rate (21%) ​ $ 199,452 21.00% ​ ​ $ 238,695 21.00% Increase (decrease) resulting from: ​ ​ ​ ​ ​ Bank-owned life insurance ​ (12,352) (1.30) ​ ​ (11,156) (0.98) Nontaxable interest income on municipal securities ​ (24,121) (2.54) ​ ​ (11,130) (0.98) Nontaxable life insurance death benefit ​ (948) (0.10) ​ ​ (35,504) (3.12) Other ​ 18,184 1.91 ​ ​ 12,150 1.06 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Actual income tax expense ​ $ 180,215 18.97% ​ ​ $ 193,054 16.98% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The composition of the Company’s net deferred tax assets and liabilities at September 30, 2023 and 2022, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Deferred tax assets ​ ​ ​ Allowance for loan losses ​ $ 202,051 ​ $ 213,650 Accrued benefits ​ 157,114 ​ 122,757 Unrealized losses on available-for-sale securities ​ 228,694 ​ 240,187 Charitable contributions ​ ​ 92,946 ​ ​ — Other ​ 60,433 ​ 52,094 ​ ​ ​ ​ ​ ​ ​ Deferred tax assets ​ 741,238 ​ 628,688 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ ​ Depreciation ​ (121,554) ​ (62,832) Federal Home Loan Bank stock dividends ​ (162,732) ​ (244,098) Mortgage servicing rights ​ (28,593) ​ (30,402) Other ​ (21,055) ​ (19,305) ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ (333,934) ​ (356,637) ​ ​ ​ ​ ​ ​ ​ Net deferred tax asset ​ $ 407,304 ​ $ 272,051 ​ Retained earnings at each of September 30, 2023 and 2022, included approximately $909,000 for which no deferred federal income tax liability has been recognized. This amount represents an allocation of income to bad debt deductions for tax purposes only. Reduction of amounts so allocated for purposes other than tax bad debt losses or adjustments arising from carryback of net operating losses would create income for tax purposes only, which would be subject to the then-current corporate income tax rate. The deferred income tax liability on the preceding amount that would have been recorded if it was expected to reverse into taxable income in the foreseeable future was approximately $191,000 at September 30, 2023 and 2022.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Sep. 30, 2023
Regulatory Matters
Regulatory Matters	Note 9: Regulatory Matters The Bank is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Bank’s assets, liabilities and certain off-balance-sheet items as calculated under U.S. GAAP reporting requirements and regulatory capital standards. The Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Furthermore, the Bank’s regulators could require adjustments to regulatory capital not reflected in these financial statements. Quantitative measures established by regulatory reporting standards to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier I capital (as defined) to risk-weighted assets (as defined), common equity Tier I capital (as defined) to total risk-weighted assets (as defined) and of Tier I capital (as defined) to average assets (as defined). Management believes, as of September 30, 2023 and 2022, that the Bank met all capital adequacy requirements to which it is subject. As of September 30, 2023, the most recent notification from the regulators categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum total risk-based capital, Tier I risk-based capital, common equity Tier I risk-based capital and Tier I leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed the Bank’s category. The Bank’s actual and required capital amounts and ratios are as follows (table amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ To Be Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Under ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prompt Corrective ​ ​ ​ ​ ​ For Capital Adequacy ​ Action ​ ​ Actual Purposes ​ Provisions ​ Amount Ratio Amount Ratio Amount Ratio ​ ​ (Dollars in thousands) As of September 30, 2023 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 21,120 ​ 19.0 % $ 8,897 ​ 8.0 % $ 11,121 ​ 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 20,186 18.2 % $ 6,672 6.0 % $ 8,897 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 20,186 18.2 % $ 5,004 4.5 % $ 7,228 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 20,186 13.1 % $ 6,158 4.0 % $ 7,697 5.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,800 16.6 % $ 7,613 8.0 % $ 9,516 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 14,816 15.6 % $ 5,710 6.0 % $ 7,613 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 14,816 15.6 % $ 4,282 4.5 % $ 6,185 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 14,816 9.7 % $ 6,106 4.0 % $ 7,632 5.0 % ​

Related Party Transactions

Related Party Transactions	12 Months Ended
	Sep. 30, 2023
Related Party Transactions
Related Party Transactions	Note 10: The Bank had loans outstanding to certain of its executive officers, directors and their related interests. Activity in these loans for the years ended September 30, 2023 and 2022, is presented in the following table. Loan balances that are no longer considered part of a related party relationship are shown as other activity. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended ​ ​ September 30, ​ 2023 2022 Balance at beginning of year ​ $ 1,111,400 ​ $ 1,160,700 ​ ​ ​ ​ ​ ​ ​ New borrowings ​ 585,000 ​ 464,800 ​ ​ ​ ​ ​ ​ ​ Repayments ​ (203,006) ​ (238,100) ​ ​ ​ ​ ​ ​ ​ Other ​ — ​ (276,000) ​ ​ ​ ​ ​ ​ ​ Balance at end of year ​ $ 1,493,394 ​ $ 1,111,400 ​ In management’s opinion, such loans and other extensions of credit and deposits were made in the ordinary course of business and were made on substantially the same terms (including interest rates and collateral) as those prevailing at the time for comparable transactions with other persons. Further, in management’s opinion, these loans did not involve more than normal risk of collectability or present other unfavorable features. Deposits from related parties held by the Bank at September 30, 2023 and 2022, totaled approximately $478,000 and $640,000, respectively.

Employee Benefits

Employee Benefits	12 Months Ended
	Sep. 30, 2023
Employee Benefits
Employee Benefits	Note 11: 401(k) Plan The Bank has a defined contribution 401(k) and profit sharing benefit plan covering substantially all employees. Employees are eligible to participate once they have reached age 21 and have completed one year of service. The Bank will make matching contributions up to 4 percent of an employee's compensation once the employee has completed 12 months of service. The Bank may make a discretionary profit sharing contribution to the plan each year. The Bank's expense for this plan totaled approximately Director Retirement Plan The Bank maintains a plan to provide specified retirement benefits to each director upon their retirement from the Board. The director retirement plan expense for the years ended September 30, 2023 and 2022, was $44,000 and $72,000, respectively. The related accrued liability as of September 30, 2023 and 2022 was $445,000 and $565,000, respectively. The Bank purchased Flexible Premium Universal Life Insurance Policies to use as an informal funding vehicle for the expected future payments. The cash surrender value of these policies is reflected on the Company’s consolidated balance sheets. ​ Employee Stock Ownership Plan (ESOP) In connection with the Conversion in July 2023, the Bank established a leveraged ESOP for eligible employees of the Bank. The ESOP trust purchased -year term loan with the Company. The interest rate of the loan is and the maturity date is December 31, 2037. The loan is secured by shares purchased with the loan proceeds and will be repaid by the ESOP with funds from the Bank’s discretionary contributions to the ESOP. When loan payments are made, ESOP shares are allocated to participants based on relative compensation. The Bank recognizes expense based on the average fair value of the shares to be allocated to the ESOP participants. No ESOP shares were allocated or committed to be released during the year ended September 30, 2023. The fair value of unallocated ESOP shares was The Company recognized expense related to the ESOP totaling $30,000 during the year ended September 30, 2023.

Disclosures about Fair Value of

Disclosures about Fair Value of Assets and Liabilities	12 Months Ended
	Sep. 30, 2023
Disclosures about Fair Value of Assets and Liabilities
Disclosures about Fair Value of Assets and Liabilities	Note 12: Fair value is the exchange price that would be received to sell an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Fair value measurements must maximize the use of observable inputs and minimize the use of unobservable inputs. There is a hierarchy of three levels of inputs that may be used to measure fair value: Level 1 Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2 Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 Significant unobservable inputs that reflect an entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Recurring Measurements The following table presents the fair value measurements of assets recognized in the accompanying consolidated balance sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall at September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in ​ Significant ​ ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ for ​ Observable ​ Unobservable ​ ​ Fair ​ Identical Assets ​ Inputs ​ Inputs ​ Value (Level 1) (Level 2) (Level 3) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 966,720 ​ $ 966,720 ​ $ — ​ $ — U.S. Government agencies ​ ​ 3,824,770 ​ ​ — ​ ​ 3,824,770 ​ ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,232,231 ​ — ​ 3,232,231 ​ — State and political subdivisions ​ 3,425,994 ​ — ​ 3,425,994 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ U.S. Treasury securities ​ $ 1,924,453 ​ $ 1,924,453 ​ $ — ​ $ — U.S. Government agencies ​ 3,798,074 ​ — ​ 3,798,074 ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,795,880 ​ — ​ 3,795,880 ​ — State and political subdivisions ​ 3,053,788 ​ — ​ 3,053,788 ​ — ​ Following is a description of the valuation methodologies used for assets measured at fair value on a recurring basis and recognized in the accompanying consolidated balance sheets, as well as the general classification of such assets pursuant to the valuation hierarchy. There are no liabilities measured at fair value on a recurring basis. There have been no significant changes in the valuation techniques during the years ended September 30, 2023 and 2022. Available-for-sale Securities Where quoted market prices are available in an active market, securities are classified within Level 1 of the valuation hierarchy. If quoted market prices are not available, then fair values are estimated by using quoted prices of securities with similar characteristics or independent asset pricing services and pricing models, the inputs of which are market-based or independently sourced market parameters, including, but not limited to, yield curves, interest rates, volatilities, prepayments, defaults, cumulative loss projections and cash flows. Such securities are classified in Level 2 of the valuation hierarchy. In certain cases where Level 1 or Level 2 are not available, securities are classified within Level 3 of the hierarchy. The Bank had no Level 3 securities. Nonrecurring Measurements Assets that may be recorded at fair value on a nonrecurring basis include impaired loans, other real estate owned, and other repossessed assets. Other real estate owned is adjusted to fair value, less costs to sell, upon transfer of the loan to foreclosed assets, usually based on an appraisal of the property. Subsequently, foreclosed assets are carried at the lower of carrying value or fair value. Other repossessed assets are valued at estimated sales prices, less costs to sell. The inputs for other real estate owned and other repossessed assets are considered to be Level 3. The Company had no assets or liabilities The following table presents the fair value measurements of assets recognized in the accompanying consolidated balance sheets measured at fair value on a nonrecurring basis and the level within the fair value hierarchy in which the fair value measurements fall at September 30, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in ​ ​ ​ Significant ​ ​ ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Fair ​ Identical Assets ​ Observable Inputs ​ Inputs ​ Value (Level 1) (Level 2) (Level 3) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ $ 54,000 ​ $ — ​ $ — ​ $ 54,000 ​ The fair value for foreclosed real estate has been estimated using appraisals performed by an independent third-party. A discount ​ The estimated fair values of the Company’s financial instruments not carried at fair value on the consolidated balance sheets are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying ​ Fair ​ Fair Value Measurements Using ​ Value Value Level 1 Level 2 Level 3 September 30, 2023 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 6,291,336 ​ $ 6,291,336 ​ $ 6,291,336 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans held for sale ​ ​ 3,094,405 ​ ​ 3,096,000 ​ ​ — ​ ​ — ​ ​ 3,096,000 Loans, net ​ 129,967,323 ​ 115,340,546 ​ — ​ — ​ 115,340,546 FHLB Stock ​ 1,368,900 ​ 1,368,900 ​ — ​ 1,368,900 ​ — Bank owned life insurance ​ 1,783,880 ​ 1,783,880 ​ 1,783,880 ​ — ​ — Accrued interest receivable ​ 456,867 ​ 456,867 ​ 456,867 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ Deposits ​ 122,815,748 ​ 123,426,791 ​ 90,497,791 ​ — ​ 32,929,000 FHLB advances ​ 12,000,000 ​ 12,001,000 ​ — ​ 12,001,000 ​ — Accrued interest payable ​ 69,434 ​ 69,434 ​ 69,434 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 14,376,718 ​ $ 14,376,718 ​ $ 14,376,718 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans, net ​ 117,670,600 ​ 106,483,104 ​ — ​ — ​ 106,483,104 FHLB Stock ​ 1,390,200 ​ 1,390,200 ​ — ​ 1,390,200 ​ — Bank owned life insurance ​ 1,742,464 ​ 1,742,464 ​ 1,742,464 ​ — ​ — Accrued interest receivable ​ 376,903 ​ 376,903 ​ 376,903 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Deposits ​ 134,758,643 ​ 134,834,412 ​ 109,492,412 ​ — ​ 25,342,000 FHLB advances ​ 3,000,000 ​ 3,003,000 ​ — ​ 3,003,000 ​ — Accrued interest payable ​ 2,778 ​ 2,778 ​ 2,778 ​ — ​ — ​ Limitations: Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Fair value estimates may not be realizable in an immediate settlement of the instrument. In some instances, there are no quoted market prices for the Company’s various financial instruments, in which case fair values may be based on estimates using present value or other valuation techniques, or based on judgments regarding future expected loss experience, current economic conditions, risk characteristic of the financial instruments, or other factors. Those techniques are significantly affected by the assumptions used, including the discount rate and estimate of future cash flows. Subsequent changes in assumptions could significantly affect the estimates.

Commitments and Credit Risks

Commitments and Credit Risks	12 Months Ended
	Sep. 30, 2023
Commitments and Credit Risks
Commitments and Credit Risks	Note 13: Commitments and Credit Risks Commitments to originate loans are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since a portion of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Each customer’s creditworthiness is evaluated on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the counterparty. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, commercial real estate and residential real estate. Lines of credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Lines of credit generally have fixed expiration dates. Since a portion of the line may expire without being drawn upon, the total unused lines do not necessarily represent future cash requirements. Each customer’s creditworthiness is evaluated on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the counterparty. Collateral held varies but may include accounts receivable, inventory, property, plant and equipment, commercial real estate and residential real estate. Management uses the same credit policies in granting lines of credit as it does for on-balance-sheet instruments. Commitments outstanding were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 ​ ​ ​ ​ ​ ​ ​ Commitments to originate loans $ 2,717,974 ​ $ 3,796,192 Undisbursed balance of loans closed ​ 9,172,548 ​ 8,975,116 ​ ​ ​ ​ ​ ​ ​ Total ​ $ 11,890,522 ​ $ 12,771,308 ​

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)	Note 14: The components of accumulated other comprehensive income (loss), included in consolidated shareholders’ equity, are as follows at September 30, 2023 and 2022: ​ ​ ​ ​ ​ ​ Unrealized Gains ​ ​ and Losses on ​ ​ Available-for- ​ Sale Securities Accumulated other comprehensive income at October 1, 2021 ​ $ 46,428 ​ ​ ​ ​ Other comprehensive loss ​ ​ (949,990) ​ ​ ​ ​ Accumulated other comprehensive loss at September 30, 2022 ​ ​ (903,562) ​ ​ ​ ​ Accumulated other comprehensive loss at October 1, 2022 ​ $ (903,562) ​ ​ ​ ​ Other comprehensive income ​ ​ 37,697 ​ ​ ​ ​ Reclassification adjustment for realized loss on sale of securities ​ ​ 5,539 ​ ​ ​ ​ Accumulated other comprehensive loss at September 30, 2023 ​ $ (860,326) ​

Conversion to Stock Form

Conversion to Stock Form	12 Months Ended
	Sep. 30, 2023
Conversion to Stock Form
Conversion to Stock Form	Note 15: On March 3, 2023, the Board of Directors of the Bank adopted a plan of conversion (Plan). The Plan was subject to the approval of the Federal Deposit Insurance Corporation and the State of Ohio Division of Financial Institutions and was approved by the affirmative vote of a majority of the total votes eligible to be cast by the voting members of the Bank at a special meeting. The Plan set forth that the Bank proposed to convert into a stock bank structure with the establishment of a stock holding company (Mercer Bancorp, Inc.), as parent of the Bank. The Bank converted to the stock form of ownership, followed by the issuance of all of the Bank’s outstanding stock to Mercer Bancorp, Inc. Pursuant to the Plan, the Bank determined the total offering value and number of shares of common stock based upon an independent appraiser’s valuation. The stock was priced at per share. In addition, the Bank’s Board of Directors adopted an employee stock ownership plan (ESOP) which subscribed for of the common stock sold in the offering. Mercer Bancorp, Inc. is organized as a corporation under the laws of the State of Maryland and owns all of the outstanding common stock of the Bank upon completion of the conversion. The costs of issuing the common stock was deducted from the sales proceeds of the offering. At the completion of the conversion to stock form, the Bank established a liquidation account in the amount of retained earnings contained in the final prospectus. The liquidation account will be maintained for the benefit of eligible savings account holders who maintain deposit accounts in the Bank after conversion.

Nature of Operations and Summ_2

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2023
Nature of Operations and Summary of Significant Accounting Policies
Nature of Operations	Nature of Operations Mercer Bancorp, Inc. (“Mercer Bancorp” or the “Company”) is a Maryland corporation incorporated on March 7, 2023, to serve as the bank holding company for Mercer Savings Bank (“Mercer Savings” or the “Bank”) in connection with the Bank’s conversion from the mutual form of organization to the stock form of organization (the “Conversion”). The Conversion was completed on July 26, 2023. In connection with the Conversion, Mercer Bancorp acquired shares to a newly formed charitable foundation. The Bank’s employee stock ownership plan (“ESOP”) purchased Mercer Savings is an Ohio chartered stock bank engaged primarily in the business of providing a variety of deposit and lending services to individual customers in western Ohio. Its primary deposit products are checking, savings, and term certificate accounts, and its primary lending products are residential and commercial mortgage, commercial, home equity lines of credit and installment loans. Its operations are conducted through its
Principles of Consolidation	Principles of Consolidation The consolidated financial statements as of and for the year ended September 30, 2023 include the accounts of Mercer Bancorp and its wholly-owned subsidiary, Mercer Savings. All intercompany transactions and balances have been eliminated in consolidation. The financial statements as of and for the year ended September 30, 2022 represent the Bank only, as the conversion to stock form, including the formation of Mercer Bancorp, was completed on July 26, 2023. References herein to the “Company” for periods prior to the completion of the stock conversion should be deemed to refer to the “Bank”.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America 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 and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, valuation of mortgage servicing rights and deferred tax assets and fair values of financial instruments.
Cash Equivalents	Cash Equivalents The Company considers all liquid investments with original maturities of three months or less to be cash equivalents. At September 30, 2023 and 2022, none of the Company’s cash accounts at nonfederal government or nongovernmental agencies exceeded FDIC insurance limits. In March 2020, the Federal Reserve's board of directors approved reducing the required reserve requirement ratios to zero percent, effectively eliminating the requirement to maintain reserve balances in cash or on deposit with the Federal Reserve Bank. This reduction in the required reserves does not have a defined timeframe and may be revised by the Federal Reserve's board in the future.
Interest-bearing Time Deposits in Banks	Interest-bearing Time Deposits in Banks Interest-bearing time deposits have original maturities greater than one year at origination and are carried at cost.
Debt Securities	Debt Securities Debt securities held by the Company generally are classified and recorded in the financial statements as follows: Classified as Description Recorded at Held to maturity (“HTM”) Certain debt securities that management has the positive intent and ability to hold to maturity Amortized cost Trading Securities that are bought and held principally for the purpose of selling in the near term and, therefore, held for only a short period of time Fair value, with changes in fair value included in earnings Available for sale (“AFS”) Securities not classified as HTM or trading Fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income (loss) ​ Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities, identified as the call date as to premiums and maturity date as to discounts. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. When the fair value of securities is below amortized cost, the Company’s accounting treatment for an other-than-temporary impairment (“OTTI”) is as follows: ​ Accounting Treatment for OTTI Components Circumstances of Impairment Credit Remaining Considerations Component Portion Not intended for sale and more likely than not that the Bank will not have to sell before recovery of cost basis Recognized in earnings Recognized in other comprehensive income Intended for sale or more likely than not that the Bank will be required to sell before recovery of cost basis Recognized in earnings ​ For held-to-maturity debt securities, the amount of OTTI recorded in other comprehensive income for the noncredit portion of a previous OTTI is amortized prospectively over the remaining life of the security on the basis of the timing of future estimated cash flows of the security. When a credit loss component is separately recognized in earnings, the amount is identified as the total of principal cash flows not expected to be received over the remaining term of the security, as projected based on cash flow projections. The Company recognized no other-than-temporary impairments on debt securities in the years ended September 30, 2023 or 2022.
Loans Held for Sale	Loans Held for Sale Mortgage and indirect auto loans originated and intended for sale in the secondary market are carried at the lower of cost or fair value in the aggregate. Net unrealized losses, if any, are recognized through a valuation allowance by charges to noninterest income. Gains and losses on loan sales are recorded in noninterest income, and direct loan origination costs and fees are deferred at origination of the loan and are recognized in noninterest income upon sale of the loan.
Lender Risk Account (LRA)	Lender Risk Account (LRA) The Federal Home Loan Bank (FHLB) requires institutions participating in its mortgage loan sales program to place a portion of the sale proceeds in a lender risk account. The LRA is maintained to offset any credit losses associated with loans sold to the FHLB by the participating institution as well as losses experienced by the overall loan pool should an individual institution’s LRA be fully exhausted. The loan sale agreements provide for the FHLB to begin distributions of the LRA funds to the Company after loan pools have had five years of payment history. After five years, the required LRA balance is recalculated at least annually and excess amounts are returned to the participating institutions.
Loans	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding principal balances, adjusted for unearned income, charge-offs, the allowance for loan losses and any unamortized deferred fees or costs on originated loans and unamortized premiums or discounts on purchased loans. For loans amortized at cost, interest income is accrued based on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, as well as premiums and discounts, are deferred and amortized as a level yield adjustment over the respective term of the loan. For all loan portfolio segments except residential and consumer loans, the Bank promptly charges-off loans, or portions thereof, when available information confirms that specific loans are uncollectible based on information that includes, but is not limited to, (1) the deteriorating financial condition of the borrower, (2) declining collateral values, and/or (3) legal action, including bankruptcy, that impairs the borrower’s ability to adequately meet its obligations. For impaired loans that are considered to be solely collateral dependent, a partial charge-off is recorded when a loss has been confirmed by an updated appraisal or other appropriate valuation of the collateral. The Bank recognizes a loan charge-off, or portion thereof, when management reasonably determines the amount of the loss. The Bank adheres to delinquency thresholds established by applicable regulatory guidance to determine the charge-off timeframe for these loans. Loans at these delinquency thresholds for which the Bank can clearly document that the loan is both well-secured and in the process of collection, such that collection will occur regardless of delinquency status, need not be charged off. For all classes, all interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash basis or cost recovery method, until qualifying for return to accrual. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Nonaccrual loans are returned to accrual status when, in the opinion of management, the financial position of the borrower indicates there is no longer any reasonable doubt as to the timely collection of interest or principal. The Bank requires a period of satisfactory performance of not less than six months before returning a nonaccrual loan to accrual status. When cash payments are received on impaired loans, the Bank records the payment as interest income unless collection of the remaining recorded principal amount is doubtful, at which time payments are used to reduce the principal balance of the loan. Troubled debt restructured loans recognize interest income on an accrual basis at the renegotiated rate if the loan is in compliance with the modified terms, no principal reduction has been granted and the loan has demonstrated the ability to perform in accordance with the renegotiated terms for a period of at least six months.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the collectibility of a loan balance is doubtful. Subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is evaluated on a quarterly basis by management and is based upon management’s periodic review of the collectability of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. The allowance consists of allocated and general components. The allocated component relates to loans that are classified as impaired. For those loans that are classified as impaired, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers nonimpaired loans and is based on historical charge-off experience by segment. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Bank over the prior three years. Management believes the three-year historical loss experience methodology is appropriate in the current economic environment. Other adjustments (qualitative/environmental considerations) for each segment may be added to the allowance for each loan segment after an assessment of internal or external influences on credit quality that are not fully reflected in the historical loss or risk rating data. A loan is considered impaired when, based on current information and events, it is probable that the Bank will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment history and the probability of collecting scheduled principal and interest payments when due, based on the loan’s current payment status and the borrower’s financial condition, including available sources of cash flows. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record and the amount of the shortfall in relation to the principal and interest owed. Impairment is generally measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price or the fair value of the collateral if the loan is collateral dependent. For impaired loans where the Bank utilizes the discounted cash flows to determine the level of impairment, the Bank includes the entire change in the present value of cash flows as a provision for loan losses. The fair values of collateral dependent impaired loans are based on independent appraisals of the collateral. In general, the Bank acquires an updated appraisal upon identification of impairment and annually thereafter for commercial, commercial real estate and multi-family loans. If the most recent appraisal is over a year old, and a new appraisal is not performed, due to lack of comparable values or other reasons, the existing appraisal is utilized and discounted based on the age of the appraisal, condition of the subject property and overall economic conditions. After determining the collateral value as described, the fair value is calculated based on the determined collateral value less selling expenses. The potential for outdated appraisal values is considered in our determination of the allowance for loan losses through our analysis of various trends and conditions including the local economy, trends in charge-offs and delinquencies and the related qualitative adjustments assigned by the Bank. Segments of loans with similar risk characteristics are collectively evaluated for impairment based on the segment’s historical loss experience adjusted for changes in trends, conditions and other relevant factors that affect repayment of the loans. In the course of working with borrowers, the Bank may choose to restructure the contractual terms of certain loans. In this scenario, the Bank attempts to work out an alternative payment schedule with the borrower in order to optimize collectibility of the loan. Any loans that are modified are reviewed by the Bank to identify if a troubled debt restructuring (“TDR”) has occurred, which is when, for economic or legal reasons related to a borrower’s financial difficulties, the Bank grants a concession to the borrower that it would not otherwise consider. Terms may be modified to fit the ability of the borrower to repay in line with the borrower’s current financial status, and the restructuring of the loan may include the transfer of assets from the borrower to satisfy the debt, a modification of loan terms or a combination of the two. If such efforts by the Bank do not result in a satisfactory arrangement, the loan is referred to legal counsel, at which time foreclosure proceedings are initiated. At any time prior to a sale of the property at foreclosure, the Bank may terminate foreclosure proceedings if the borrower is able to work out a satisfactory payment plan. It is the Bank’s policy that any restructured loans on nonaccrual status prior to being restructured remain on nonaccrual status until six months of satisfactory borrower performance, at which time management would consider its return to accrual status. If a loan was accruing at the time of restructuring, the Bank reviews the loan to determine if it is appropriate to continue the accrual of interest on the restructured loan. With regard to determination of the amount of the allowance for loan losses, troubled debt restructured loans are considered to be impaired. As a result, the determination of the amount of impaired loans for each portfolio segment within troubled debt restructurings is the same as detailed previously.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Bank, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Bank does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity.
Premises and Equipment	Premises and Equipment Depreciable assets are stated at cost less accumulated depreciation. Depreciation is charged to expense using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of depreciable assets are as follows: building and improvements are 5-40 years; furniture and fixtures are 5-10 years; information technology-related equipment is 3-5 years.
Servicing Assets	Servicing Assets When mortgage loans are sold with servicing retained, servicing rights are initially recorded at fair value with the income statement effect recorded in gains on sales of loans. Fair value is based on market prices for comparable mortgage servicing contracts, when available or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into non-interest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Servicing assets are included in other assets on the consolidated balance sheets. Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to carrying amount. Impairment is determined by stratifying rights into groupings based on predominant risk characteristics, such as interest rate, loan type and investor type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. If the Bank later determines that all or a portion of the impairment no longer exists for a particular grouping, a reduction of the allowance may be recorded as an increase to income. No changes in valuation allowances have been reported on the income statements. The fair values of servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. Servicing fee income, which is reported on the consolidated income statement as other noninterest income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal; or a fixed amount per loan and are recorded as income when earned. The amortization of mortgage servicing rights is netted against loan servicing fee income.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock Federal Home Loan Bank (“FHLB”) stock is a required investment for institutions that are members of the FHLB system and the transfer of the stock is substantially restricted. The required investment in the common stock is based on a predetermined formula. FHLB stock is carried at cost. FHLB stock is evaluated for impairment on an annual basis. The Bank’s investment in FHLB stock was not impaired at September 30, 2023 and 2022.
Bank Owned Life Insurance	Bank Owned Life Insurance The Bank has purchased life insurance on directors. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Foreclosed Assets Held for Sale	Foreclosed Assets Held for Sale Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value less cost to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in net income or expense from foreclosed assets. At September 30, 2022, the Bank had no foreclosed residential real estate properties. At September 30, 2023, the Bank had two consumer mortgage loans secured by residential real estate properties totaling $136,000 for which formal foreclosure proceedings are in process. At September 30, 2022, the Bank had no consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process.
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with income tax accounting guidance (Accounting Standards Codification (“ASC”) 740, Income Taxes Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized. Tax positions are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances and information available at the reporting date and is subject to management’s judgment. If necessary, the Company recognizes interest and penalties on income taxes as a component of income tax expense. With a few exceptions, the Company is no longer subject to examination by tax authorities for calendar years before 2020. As of September 30, 2023 and 2022, the Company had no material uncertain income tax positions.
Employee Stock Ownership Plan (ESOP)	Employee Stock Ownership Plan (ESOP) The cost of shares issued to the Employee Stock Ownership Plan (“ESOP”), but not yet allocated to participants, is shown as a reduction of shareholders’ equity. Compensation expense is based on the average fair value of shares as they are committed to be released to participant accounts.
Earnings Per Share	Earnings Per Share Basic earnings per share is calculated by dividing net income by the weighted-average number of common shares outstanding during the year. Unallocated common shares held by the ESOP are shown as a reduction in shareholders’ equity and are excluded from weighted-average common shares outstanding for both basic and diluted earnings per share calculations until they are committed to be released. The Company had no dilutive or potentially dilutive securities during the year ended September 30, 2023. Earnings per share is not meaningful to the fiscal year ended September 30, 2023, as the Company completed the stock offering and conversion to stock form on July 26, 2023.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) consists of net income and other comprehensive income (loss), net of applicable income taxes. Other comprehensive income (loss) includes unrealized appreciation (depreciation) on available-for-sale securities and, if necessary, unrealized appreciation (depreciation) on available-for-sale securities for which a portion of an other-than-temporary impairment has been recognized in income. Accumulated other comprehensive loss consists solely of the cumulative unrealized gains and losses on available-for-sale securities, net of tax.
Revenue Recognition	Revenue Recognition The Company accounts for certain revenues in accordance with Accounting Standards Update (“ASU”) 2014-09 Revenue from Contracts with Customers Deposit Services. For deposit-related services, revenue is recognized when performance obligations are satisfied, which is, generally, at a point in time.

Nature of Operations and Summ_3

Nature of Operations and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2023
Nature of Operations and Summary of Significant Accounting Policies
Schedule of Circumstances of impairment considerations	​ Accounting Treatment for OTTI Components Circumstances of Impairment Credit Remaining Considerations Component Portion Not intended for sale and more likely than not that the Bank will not have to sell before recovery of cost basis Recognized in earnings Recognized in other comprehensive income Intended for sale or more likely than not that the Bank will be required to sell before recovery of cost basis Recognized in earnings

Debt Securities (Tables)

Debt Securities (Tables)	12 Months Ended
	Sep. 30, 2023
Debt Securities
Schedule of available-for-sale securities for amortized cost and fair values, together with gross unrealized gains and losses of securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ ​ Cost ​ Gains ​ Losses ​ Fair Value Available-for-sale Securities: ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 999,565 ​ $ — ​ $ (32,845) ​ $ 966,720 U.S. Government agencies ​ 4,009,577 ​ — ​ (184,807) ​ 3,824,770 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,647,020 ​ — ​ (414,789) ​ 3,232,231 State and political subdivisions ​ 3,882,574 ​ — ​ (456,580) ​ 3,425,994 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 12,538,736 ​ $ — ​ $ (1,089,021) ​ $ 11,449,715 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ Cost Gains Losses Fair Value Available-for-sale Securities: ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ U.S. Treasury securities ​ $ 2,008,695 ​ $ — ​ $ (84,242) ​ $ 1,924,453 U.S. Government agencies ​ 4,025,948 ​ — ​ (227,874) ​ 3,798,074 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 4,191,085 ​ — ​ (395,205) ​ 3,795,880 State and political subdivisions ​ 3,490,216 ​ 201 ​ (436,629) ​ 3,053,788 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 13,715,944 ​ $ 201 ​ $ (1,143,950) ​ $ 12,572,195
Schedule of held-to-maturity for amortized cost and fair values, together with gross unrealized gains and losses of securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Approximate ​ Cost Gains Losses Fair Value Held-to-maturity Securities: ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 147,291 ​ $ — ​ $ (4,149) ​ $ 143,142 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 233,388 ​ $ — ​ $ (5,304) ​ $ 228,084
Schedule of amortized cost and fair value of available-for-sale securities by contractual maturity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortized ​ Fair ​ Cost Value September 30, 2023 ​ ​ Within one year ​ $ 1,999,723 ​ $ 1,955,480 One to five years ​ 3,461,141 ​ 3,258,385 Five to ten years ​ — ​ — After ten years ​ 3,430,852 ​ 3,003,619 ​ ​ 8,891,716 ​ 8,217,484 Mortgage-backed GSEs ​ 3,647,020 ​ 3,232,231 Totals ​ $ 12,538,736 ​ $ 11,449,715
Schedule of gross unrealized losses and fair value of investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment class and length of time that individual securities have been in a continuous unrealized loss position	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized Description of Securities Value Losses Value Losses Value Losses Available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ — ​ $ — ​ $ 966,720 ​ $ (32,845) ​ $ 966,720 ​ $ (32,845) U.S. Government agencies ​ — ​ — ​ 3,824,770 ​ (184,807) ​ 3,824,770 ​ (184,807) Mortgage-backed Government Sponsored Enterprises (GSEs) ​ — ​ — ​ 3,232,231 ​ (414,789) ​ 3,232,231 ​ (414,789) State and political subdivisions ​ 1,481,544 ​ (71,136) ​ 1,944,450 ​ (385,444) ​ 3,425,994 ​ (456,580) ​ ​ 1,481,544 ​ (71,136) ​ 9,968,171 ​ (1,017,885) ​ 11,449,715 ​ (1,089,021) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ — ​ — ​ 143,142 ​ (4,149) ​ 143,142 ​ (4,149) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 1,481,544 ​ $ (71,136) ​ $ 10,111,313 ​ $ (1,022,034) ​ $ 11,592,857 ​ $ (1,093,170) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ Less than 12 Months ​ 12 Months or More ​ Total ​ ​ Fair ​ Unrealized ​ Fair ​ Unrealized ​ Fair ​ Unrealized Description of Securities Value Losses Value Losses Value Losses Available for sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ — ​ $ — ​ $ 1,924,453 ​ $ (84,242) ​ $ 1,924,453 ​ $ (84,242) U.S. Government agencies ​ 1,924,522 ​ (98,137) ​ 1,873,552 ​ (129,737) ​ 3,798,074 ​ (227,874) Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,110,636 ​ (291,370) ​ 685,244 ​ (103,835) ​ 3,795,880 ​ (395,205) State and political subdivisions ​ 2,822,544 ​ (436,629) ​ — ​ — ​ 2,822,544 ​ (436,629) ​ ​ 7,857,702 ​ (826,136) ​ 4,483,249 ​ (317,814) ​ 12,340,951 ​ (1,143,950) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 228,071 ​ (5,304) ​ — ​ — ​ 228,071 ​ (5,304) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 8,085,773 ​ $ (831,440) ​ $ 4,483,249 ​ $ (317,814) ​ $ 12,569,022 ​ $ (1,149,254)

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Sep. 30, 2023
Loans and Allowance for Loan Losses
Schedule of categories of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Real estate loans: ​ ​ ​ Residential ​ $ 74,561,278 ​ $ 78,311,447 Multi-family ​ 1,309,586 ​ 1,356,547 Agricultural ​ 36,378,192 ​ 28,516,448 Commercial ​ 2,311,882 ​ 1,790,159 Construction and land ​ 5,082,863 ​ 3,609,744 Home equity line of credit (HELOC) ​ 4,708,023 ​ 5,174,912 Commercial and industrial ​ 1,801,569 ​ 1,833,194 Consumer ​ 7,652,164 ​ 925,901 ​ ​ ​ ​ ​ ​ ​ Total loans ​ 133,805,557 ​ 121,518,352 ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ Undisbursed loans in process ​ 2,578,282 ​ 2,529,981 Net deferred loan fees ​ 325,621 ​ 334,117 Allowance for loan losses ​ 934,331 ​ 983,654 ​ ​ ​ ​ ​ ​ ​ Net loans ​ $ 129,967,323 ​ $ 117,670,600
Schedule of activity in the allowance for loan losses based on portfolio segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended September 30, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2022 for loan losses Charge-offs Recoveries September 30, 2023 Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 623,649 ​ $ 163,934 ​ $ (49,353) ​ $ — ​ $ 738,230 Multi-family ​ 11,008 ​ 1,832 ​ — ​ — ​ 12,840 Agricultural ​ 199,011 ​ (125,403) ​ — ​ — ​ 73,608 Commercial ​ 10,801 ​ (6,123) ​ — ​ — ​ 4,678 Construction and land ​ 35,292 ​ 14,543 ​ — ​ — ​ 49,835 Home equity line of credit (HELOC) ​ 69,234 ​ (54,945) ​ — ​ — ​ 14,289 Commercial and industrial ​ 12,086 ​ (8,441) ​ — ​ — ​ 3,645 Consumer ​ 22,573 ​ 14,603 ​ — ​ 30 ​ 37,206 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 983,654 ​ $ — ​ $ (49,353) ​ $ 30 ​ $ 934,331 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended September 30, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2021 for loan losses Charge-offs Recoveries September 30, 2022 Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 627,259 ​ $ (3,610) ​ $ — ​ $ — ​ $ 623,649 Multi-family ​ 9,983 ​ 1,025 ​ — ​ — ​ 11,008 Agricultural ​ 210,632 ​ (11,621) ​ — ​ — ​ 199,011 Commercial ​ 12,491 ​ (1,690) ​ — ​ — ​ 10,801 Construction and land ​ 31,908 ​ 3,384 ​ — ​ — ​ 35,292 Home equity line of credit (HELOC) ​ 39,716 ​ 29,518 ​ — ​ — ​ 69,234 Commercial and industrial ​ 12,255 ​ (169) ​ — ​ — ​ 12,086 Consumer ​ 13,659 ​ 8,163 ​ — ​ 751 ​ 22,573 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 957,903 ​ $ 25,000 ​ $ — ​ $ 751 ​ $ 983,654
Schedule of allowance for loan losses and the recorded investment in loans based on portfolio segment and impairment method	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ Loans ​ ​ Ending balance, evaluated for impairment ​ Ending balance, evaluated for impairment ​ Individually Collectively Individually Collectively ​ ​ (In thousands) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 738,230 ​ $ — ​ $ 74,561,278 Multi-family ​ — ​ 12,840 ​ — ​ 1,309,586 Agricultural ​ — ​ 73,608 ​ — ​ 36,378,192 Commercial ​ — ​ 4,678 ​ — ​ 2,311,882 Construction and land ​ — ​ 49,835 ​ — ​ 5,082,863 Home equity line of credit (HELOC) ​ — ​ 14,289 ​ — ​ 4,708,023 Commercial and industrial ​ — ​ 3,645 ​ — ​ 1,801,569 Consumer ​ — ​ 37,206 ​ — ​ 7,652,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 934,331 ​ $ — ​ $ 133,805,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ Loans ​ ​ Ending balance, evaluated for impairment ​ Ending balance, evaluated for impairment ​ Individually Collectively Individually Collectively ​ ​ (In thousands) September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 623,649 ​ $ — ​ $ 78,311,447 Multi-family ​ — ​ 11,008 ​ — ​ 1,356,547 Agricultural ​ — ​ 199,011 ​ — ​ 28,516,448 Commercial ​ — ​ 10,801 ​ — ​ 1,790,159 Construction and land ​ — ​ 35,292 ​ — ​ 3,609,744 Home equity line of credit (HELOC) ​ — ​ 69,234 ​ — ​ 5,174,912 Commercial and industrial ​ — ​ 12,086 ​ — ​ 1,833,194 Consumer ​ — ​ 22,573 ​ — ​ 925,901 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 983,654 ​ $ — ​ $ 121,518,352
Schedule of credit quality indicators	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 74,083,965 ​ $ — ​ $ 477,313 ​ $ — ​ $ 74,561,278 Multi-family ​ 1,309,586 ​ — ​ — ​ — ​ 1,309,586 Agricultural ​ 36,378,192 ​ — ​ — ​ — ​ 36,378,192 Commercial ​ 2,311,882 ​ — ​ — ​ — ​ 2,311,882 Construction and land ​ 5,082,863 ​ — ​ — ​ — ​ 5,082,863 Home equity line of credit (HELOC) ​ 4,708,023 ​ — ​ — ​ — ​ 4,708,023 Commercial and industrial ​ 1,801,569 ​ — ​ — ​ — ​ 1,801,569 Consumer ​ 7,652,164 ​ — ​ — ​ — ​ 7,652,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 133,328,244 ​ $ — ​ $ 477,313 ​ $ — ​ $ 133,805,557 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 77,964,201 ​ $ — ​ $ 347,246 ​ $ — ​ $ 78,311,447 Multi-family ​ 1,356,547 ​ — ​ — ​ — ​ 1,356,547 Agricultural ​ 28,516,448 ​ — ​ — ​ — ​ 28,516,448 Commercial ​ 1,790,159 ​ — ​ — ​ — ​ 1,790,159 Construction and land ​ 3,609,744 ​ — ​ — ​ — ​ 3,609,744 Home equity line of credit (HELOC) ​ 5,174,912 ​ — ​ — ​ — ​ 5,174,912 Commercial and industrial ​ 1,833,194 ​ — ​ — ​ — ​ 1,833,194 Consumer ​ 923,401 ​ — ​ 2,500 ​ — ​ 925,901 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,168,606 ​ $ — ​ $ 349,746 ​ $ — ​ $ 121,518,352 ​
Schedule of loan portfolio aging analysis of the recorded investment in loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2023 ​ ​ ​ ​ ​ ​ Greater Than ​ ​ ​ ​ ​ ​ ​ Total Loans > ​ ​ 30-59 Days ​ 60-89 Days ​ 90 Days ​ Total ​ ​ ​ Total Loans ​ 90 Days & ​ Past Due Past Due Past Due Past Due Current Receivable Accruing Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 482,844 ​ $ 332,929 ​ $ 477,313 ​ $ 1,293,086 ​ $ 73,268,192 ​ $ 74,561,278 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,309,586 ​ 1,309,586 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 36,378,192 ​ 36,378,192 ​ — Commercial ​ — ​ — ​ — ​ — ​ 2,311,882 ​ 2,311,882 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 5,082,863 ​ 5,082,863 ​ — Home equity line of credit (HELOC) ​ — ​ — ​ — ​ — ​ 4,708,023 ​ 4,708,023 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,801,569 ​ 1,801,569 ​ — Consumer ​ 5,653 ​ 20,831 ​ — ​ 26,484 ​ 7,625,680 ​ 7,652,164 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 488,497 ​ $ 353,760 ​ $ 477,313 ​ $ 1,319,570 ​ $ 132,485,987 ​ $ 133,805,557 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ ​ ​ Greater Than ​ ​ ​ ​ ​ ​ ​ Total Loans > ​ ​ 30-59 Days ​ 60-89 Days ​ 90 Days ​ Total ​ ​ ​ Total Loans ​ 90 Days & ​ Past Due Past Due Past Due Past Due Current Receivable Accruing Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 270,843 ​ $ 65,100 ​ $ 347,246 ​ $ 683,189 ​ $ 77,628,258 ​ $ 78,311,447 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,356,547 ​ 1,356,547 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 28,516,448 ​ 28,516,448 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,790,159 ​ 1,790,159 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 3,609,744 ​ 3,609,744 ​ — Home equity line of credit (HELOC) ​ 143,983 ​ — ​ — ​ 143,983 ​ 5,030,929 ​ 5,174,912 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,833,194 ​ 1,833,194 ​ — Consumer ​ — ​ — ​ 2,500 ​ 2,500 ​ 923,401 ​ 925,901 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 414,826 ​ $ 65,100 ​ $ 349,746 ​ $ 829,672 ​ $ 120,688,680 ​ $ 121,518,352 ​ $ — ​
Schedule of Nonaccrual loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 ​ ​ ​ ​ ​ ​ ​ Residential real estate loans ​ $ 477,313 ​ $ 347,246 Consumer ​ — ​ 2,500 ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 477,313 ​ $ 349,746

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Sep. 30, 2023
Premises and Equipment
Schedule of major classifications of premises and equipment, stated at cost	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Land ​ $ 483,570 ​ $ 483,570 Buildings and improvements ​ 4,261,697 ​ 4,247,815 Furniture and equipment ​ 1,621,935 ​ 1,534,124 ​ ​ ​ ​ ​ ​ ​ ​ ​ 6,367,202 ​ 6,265,509 Less accumulated depreciation ​ 3,765,627 ​ 3,657,218 ​ ​ ​ ​ ​ ​ ​ Net premises and equipment ​ $ 2,601,575 ​ $ 2,608,291

Time Deposits (Tables)

Time Deposits (Tables)	12 Months Ended
	Sep. 30, 2023
Time Deposits.
Schedule of maturities of time deposits	​ ​ ​ ​ ​ ​ September 30, ​ ​ 2023 Within one year ​ $ 26,619,426 One year to two years ​ 4,246,879 Two years to three years ​ 594,876 Three years to four years ​ 405,846 Four years to five years ​ 450,930 ​ ​ ​ ​ ​ ​ $ 32,317,957 ​

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Sep. 30, 2023
Borrowings
Schedule of maturities of FHLB	​ ​ ​ ​ ​ ​ September 30, ​ ​ 2023 Within one year (weighted average rate 5.02%) ​ $ 11,000,000 One year to two years (weighted average rate 1.11%) ​ 1,000,000 ​ ​ ​ ​ ​ ​ $ 12,000,000

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2023
Income Taxes
Schedule of provision for income tax components	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 Taxes currently payable ​ $ 326,960 ​ $ 195,067 Deferred income taxes ​ (146,745) ​ (2,013) ​ ​ ​ ​ ​ ​ ​ Income tax expense ​ $ 180,215 ​ $ 193,054
Schedule of reconciliation of federal income tax expense at statutory rate	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ % of Pretax ​ ​ ​ ​ % of Pretax ​ ​ ​ Amount Income ​ ​ ​ Amount Income Computed at statutory rate (21%) ​ $ 199,452 21.00% ​ ​ $ 238,695 21.00% Increase (decrease) resulting from: ​ ​ ​ ​ ​ Bank-owned life insurance ​ (12,352) (1.30) ​ ​ (11,156) (0.98) Nontaxable interest income on municipal securities ​ (24,121) (2.54) ​ ​ (11,130) (0.98) Nontaxable life insurance death benefit ​ (948) (0.10) ​ ​ (35,504) (3.12) Other ​ 18,184 1.91 ​ ​ 12,150 1.06 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Actual income tax expense ​ $ 180,215 18.97% ​ ​ $ 193,054 16.98% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of net deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Deferred tax assets ​ ​ ​ Allowance for loan losses ​ $ 202,051 ​ $ 213,650 Accrued benefits ​ 157,114 ​ 122,757 Unrealized losses on available-for-sale securities ​ 228,694 ​ 240,187 Charitable contributions ​ ​ 92,946 ​ ​ — Other ​ 60,433 ​ 52,094 ​ ​ ​ ​ ​ ​ ​ Deferred tax assets ​ 741,238 ​ 628,688 ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ ​ Depreciation ​ (121,554) ​ (62,832) Federal Home Loan Bank stock dividends ​ (162,732) ​ (244,098) Mortgage servicing rights ​ (28,593) ​ (30,402) Other ​ (21,055) ​ (19,305) ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities ​ (333,934) ​ (356,637) ​ ​ ​ ​ ​ ​ ​ Net deferred tax asset ​ $ 407,304 ​ $ 272,051

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Sep. 30, 2023
Regulatory Matters
Schedule of actual and required capital amounts and ratios	The Bank’s actual and required capital amounts and ratios are as follows (table amounts in thousands): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ To Be Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Under ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Prompt Corrective ​ ​ ​ ​ ​ For Capital Adequacy ​ Action ​ ​ Actual Purposes ​ Provisions ​ Amount Ratio Amount Ratio Amount Ratio ​ ​ (Dollars in thousands) As of September 30, 2023 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 21,120 ​ 19.0 % $ 8,897 ​ 8.0 % $ 11,121 ​ 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 20,186 18.2 % $ 6,672 6.0 % $ 8,897 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 20,186 18.2 % $ 5,004 4.5 % $ 7,228 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 20,186 13.1 % $ 6,158 4.0 % $ 7,697 5.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, 2022 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,800 16.6 % $ 7,613 8.0 % $ 9,516 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 14,816 15.6 % $ 5,710 6.0 % $ 7,613 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 14,816 15.6 % $ 4,282 4.5 % $ 6,185 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 14,816 9.7 % $ 6,106 4.0 % $ 7,632 5.0 % ​

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Sep. 30, 2023
Related Party Transactions
Schedule of bank loans outstanding to certain executive officers, directors and related interests	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Year Ended ​ ​ September 30, ​ 2023 2022 Balance at beginning of year ​ $ 1,111,400 ​ $ 1,160,700 ​ ​ ​ ​ ​ ​ ​ New borrowings ​ 585,000 ​ 464,800 ​ ​ ​ ​ ​ ​ ​ Repayments ​ (203,006) ​ (238,100) ​ ​ ​ ​ ​ ​ ​ Other ​ — ​ (276,000) ​ ​ ​ ​ ​ ​ ​ Balance at end of year ​ $ 1,493,394 ​ $ 1,111,400

Disclosures about Fair Value _2

Disclosures about Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of carrying amount and estimated fair value of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying ​ Fair ​ Fair Value Measurements Using ​ Value Value Level 1 Level 2 Level 3 September 30, 2023 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 6,291,336 ​ $ 6,291,336 ​ $ 6,291,336 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans held for sale ​ ​ 3,094,405 ​ ​ 3,096,000 ​ ​ — ​ ​ — ​ ​ 3,096,000 Loans, net ​ 129,967,323 ​ 115,340,546 ​ — ​ — ​ 115,340,546 FHLB Stock ​ 1,368,900 ​ 1,368,900 ​ — ​ 1,368,900 ​ — Bank owned life insurance ​ 1,783,880 ​ 1,783,880 ​ 1,783,880 ​ — ​ — Accrued interest receivable ​ 456,867 ​ 456,867 ​ 456,867 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ Deposits ​ 122,815,748 ​ 123,426,791 ​ 90,497,791 ​ — ​ 32,929,000 FHLB advances ​ 12,000,000 ​ 12,001,000 ​ — ​ 12,001,000 ​ — Accrued interest payable ​ 69,434 ​ 69,434 ​ 69,434 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 14,376,718 ​ $ 14,376,718 ​ $ 14,376,718 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans, net ​ 117,670,600 ​ 106,483,104 ​ — ​ — ​ 106,483,104 FHLB Stock ​ 1,390,200 ​ 1,390,200 ​ — ​ 1,390,200 ​ — Bank owned life insurance ​ 1,742,464 ​ 1,742,464 ​ 1,742,464 ​ — ​ — Accrued interest receivable ​ 376,903 ​ 376,903 ​ 376,903 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ Deposits ​ 134,758,643 ​ 134,834,412 ​ 109,492,412 ​ — ​ 25,342,000 FHLB advances ​ 3,000,000 ​ 3,003,000 ​ — ​ 3,003,000 ​ — Accrued interest payable ​ 2,778 ​ 2,778 ​ 2,778 ​ — ​ —
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of fair value measurements of assets measured at fair value on a recurring and non-recurring basis and the level within the fair value hierarchy	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in ​ Significant ​ ​ ​ ​ ​ ​ Active Markets ​ Other ​ Significant ​ ​ ​ ​ for ​ Observable ​ Unobservable ​ ​ Fair ​ Identical Assets ​ Inputs ​ Inputs ​ Value (Level 1) (Level 2) (Level 3) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 966,720 ​ $ 966,720 ​ $ — ​ $ — U.S. Government agencies ​ ​ 3,824,770 ​ ​ — ​ ​ 3,824,770 ​ ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,232,231 ​ — ​ 3,232,231 ​ — State and political subdivisions ​ 3,425,994 ​ — ​ 3,425,994 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2022 ​ ​ ​ ​ U.S. Treasury securities ​ $ 1,924,453 ​ $ 1,924,453 ​ $ — ​ $ — U.S. Government agencies ​ 3,798,074 ​ — ​ 3,798,074 ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,795,880 ​ — ​ 3,795,880 ​ — State and political subdivisions ​ 3,053,788 ​ — ​ 3,053,788 ​ —
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of fair value measurements of assets measured at fair value on a recurring and non-recurring basis and the level within the fair value hierarchy	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fair Value Measurements Using ​ ​ ​ ​ Quoted Prices in ​ ​ ​ Significant ​ ​ ​ ​ Active Markets for ​ Significant Other ​ Unobservable ​ ​ Fair ​ Identical Assets ​ Observable Inputs ​ Inputs ​ Value (Level 1) (Level 2) (Level 3) September 30, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Foreclosed real estate ​ $ 54,000 ​ $ — ​ $ — ​ $ 54,000

Commitments and Credit Risks (T

Commitments and Credit Risks (Tables)	12 Months Ended
	Sep. 30, 2023
Commitments and Credit Risks
Schedule of commitments outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, ​ 2023 2022 ​ ​ ​ ​ ​ ​ ​ Commitments to originate loans $ 2,717,974 ​ $ 3,796,192 Undisbursed balance of loans closed ​ 9,172,548 ​ 8,975,116 ​ ​ ​ ​ ​ ​ ​ Total ​ $ 11,890,522 ​ $ 12,771,308 ​

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss)
Schedule of components of accumulated other comprehensive income (loss)	​ ​ ​ ​ ​ ​ Unrealized Gains ​ ​ and Losses on ​ ​ Available-for- ​ Sale Securities Accumulated other comprehensive income at October 1, 2021 ​ $ 46,428 ​ ​ ​ ​ Other comprehensive loss ​ ​ (949,990) ​ ​ ​ ​ Accumulated other comprehensive loss at September 30, 2022 ​ ​ (903,562) ​ ​ ​ ​ Accumulated other comprehensive loss at October 1, 2022 ​ $ (903,562) ​ ​ ​ ​ Other comprehensive income ​ ​ 37,697 ​ ​ ​ ​ Reclassification adjustment for realized loss on sale of securities ​ ​ 5,539 ​ ​ ​ ​ Accumulated other comprehensive loss at September 30, 2023 ​ $ (860,326) ​

Nature of Operations and Summ_4

Nature of Operations and Summary of Significant Accounting Policies (Details)		12 Months Ended
	Jul. 26, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) Office customer	Sep. 30, 2022 USD ($) item customer
Property, Plant and Equipment [Line Items]
Number of office location | Office		4
Number of shares issued | shares	1,022,970
Number of ESOP shares sold | shares	81,838
ESOP shares issued as a percentage of common stock issued	8%
Amount contributed of the net proceeds from the offering	$ 4,117,000
Amount loaned to ESOP	818,000
Amount retained	$ 3,299,000
Other than temporary impairments on debt securities		$ 0	$ 0
Valuation allowance		$ 0
Number of foreclosed residential real estate | item			0
Number of consumer mortgage loan receivables | customer		2	0
Mortgage loans foreclosure amount		$ 136,000
Dilutive Security		$ 0
Newly Formed Charitable Foundation [Member]
Property, Plant and Equipment [Line Items]
Number of shares issued | shares	50,000
Mercer Savings Bank
Property, Plant and Equipment [Line Items]
Percentage of ownership acquired	100%
Number of shares offered and sold | shares	972,970
Price per share | $ / shares	$ 10
Gross offering proceeds	$ 9,729,700
Cost of the conversion and issuance of common stock	$ 1,496,000
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		5 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		10 years
Technology Equipment | Minimum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		3 years
Technology Equipment | Maximum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		5 years
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		5 years
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Premises and Equipment, Useful Life		40 years

Debt Securities - Available for

Debt Securities - Available for Sale Debt Securities Fair Value to Amortized Cost (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Available-for-sale Securities:
Amortized cost	$ 12,538,736	$ 13,715,944
Gross Unrealized Gains		201
Gross Unrealized Losses	(1,089,021)	(1,143,950)
Approximate Fair Value	11,449,715	12,572,195
U.S. Treasury securities
Available-for-sale Securities:
Amortized cost	999,565	2,008,695
Gross Unrealized Losses	(32,845)	(84,242)
Approximate Fair Value	966,720	1,924,453
U.S. Government agencies
Available-for-sale Securities:
Amortized cost	4,009,577	4,025,948
Gross Unrealized Losses	(184,807)	(227,874)
Approximate Fair Value	3,824,770	3,798,074
Mortgage-backed Government Sponsored Enterprises (GSEs)
Available-for-sale Securities:
Amortized cost	3,647,020	4,191,085
Gross Unrealized Losses	(414,789)	(395,205)
Approximate Fair Value	3,232,231	3,795,880
State and political subdivisions
Available-for-sale Securities:
Amortized cost	3,882,574	3,490,216
Gross Unrealized Gains		201
Gross Unrealized Losses	(456,580)	(436,629)
Approximate Fair Value	$ 3,425,994	$ 3,053,788

Debt Securities - Held-to-Matur

Debt Securities - Held-to-Maturity Fair Value to Amortized Cost (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Held-to-maturity Securities:
Held-to-maturity securities	$ 147,291	$ 233,388
Mortgage-backed Government Sponsored Enterprises (GSEs)
Held-to-maturity Securities:
Amortized Cost	147,291	233,388
Gross Unrealized Losses	(4,149)	(5,304)
Held-to-maturity securities	$ 143,142	$ 228,084

Debt Securities - Amortized Cos

Debt Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Amortized cost
Within one year	$ 1,999,723
One to five years	3,461,141
After ten years	3,430,852
Total, single maturity date	8,891,716
Amortized cost	12,538,736	$ 13,715,944
Fair value
Within one year	1,955,480
One to five years	3,258,385
After ten years	3,003,619
Total, single maturity date	8,217,484
Totals	11,449,715	12,572,195
Mortgage-backed Government Sponsored Enterprises (GSEs)
Amortized cost
Without single maturity date	3,647,020
Amortized cost	3,647,020	4,191,085
Fair value
Without single maturity date	3,232,231
Totals	$ 3,232,231	$ 3,795,880

Debt Securities - Narratives (D

Debt Securities - Narratives (Details)	12 Months Ended
	Sep. 30, 2023 USD ($) security	Sep. 30, 2022 USD ($) security
Debt Securities
Carrying value of securities pledged as collateral	$ 468,000	$ 460,000
Proceeds from sales of available-for-sale securites	1,654,746	$ 0
Gross realized gains	5,735
Gross realized losses	$ 12,747
Number of positions | security	28	29
Available-for-sale securities	$ 11,449,715	$ 12,572,195
Total fair value of these investments	$ 11,592,857	$ 12,569,022
Percentage of fair value	100%	98%

Debt Securities - Continuous Un

Debt Securities - Continuous Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Available for sale, Fair Value:
Less than 12 Months, Fair Value	$ 1,481,544	$ 7,857,702
12 Months or More, Fair Value	9,968,171	4,483,249
Total, Fair Value	11,449,715	12,340,951
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	(71,136)	(826,136)
12 Months or More, Unrealized Losses	(1,017,885)	(317,814)
Total, Unrealized Losses	(1,089,021)	(1,143,950)
Total temporarily impaired securities, Fair Value:
Less than 12 Months, Fair Value	1,481,544	8,085,773
12 Months or More, Fair Value	10,111,313	4,483,249
Total, Fair Value	11,592,857	12,569,022
Total temporarily impaired securities, Unrealized Losses:
Less than 12 Months, Unrealized Losses	(71,136)	(831,440)
12 Months or More, Unrealized Losses	(1,022,034)	(317,814)
Total, Unrealized Losses	(1,093,170)	(1,149,254)
U.S. Treasury securities
Available for sale, Fair Value:
12 Months or More, Fair Value	966,720	1,924,453
Total, Fair Value	966,720	1,924,453
Available for sale, Unrealized Losses:
12 Months or More, Unrealized Losses	(32,845)	(84,242)
Total, Unrealized Losses	(32,845)	(84,242)
U.S. Government agencies
Available for sale, Fair Value:
Less than 12 Months, Fair Value		1,924,522
12 Months or More, Fair Value	3,824,770	1,873,552
Total, Fair Value	3,824,770	3,798,074
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses		(98,137)
12 Months or More, Unrealized Losses	(184,807)	(129,737)
Total, Unrealized Losses	(184,807)	(227,874)
Mortgage-backed Government Sponsored Enterprises (GSEs)
Available for sale, Fair Value:
Less than 12 Months, Fair Value		3,110,636
12 Months or More, Fair Value	3,232,231	685,244
Total, Fair Value	3,232,231	3,795,880
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses		(291,370)
12 Months or More, Unrealized Losses	(414,789)	(103,835)
Total, Unrealized Losses	(414,789)	(395,205)
Held to maturity, Fair Value:
Less than 12 Months, Fair Value		228,071
12 Months or More, Fair Value	143,142
Total, Fair Value	143,142	228,071
Held to maturity, Unrealized Losses:
Less than 12 Months, Unrealized Losses		(5,304)
12 Months or More, Unrealized Losses	(4,149)
Total, Unrealized Losses	(4,149)	(5,304)
State and political subdivisions
Available for sale, Fair Value:
Less than 12 Months, Fair Value	1,481,544	2,822,544
12 Months or More, Fair Value	1,944,450
Total, Fair Value	3,425,994	2,822,544
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	(71,136)	(436,629)
12 Months or More, Unrealized Losses	(385,444)
Total, Unrealized Losses	$ (456,580)	$ (436,629)

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Categories of Loans (Details) - USD ($)	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2022	Oct. 01, 2021
Loans and Allowance for Loan Losses
Total loans	$ 133,805,557		$ 121,518,352
Less:
Undisbursed loans in process	2,578,282		2,529,981
Net deferred loan fees	325,621		334,117
Allowance for loan losses	934,331	$ 983,654	983,654	$ 957,903
Net loans	129,967,323		117,670,600
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	74,561,278		78,311,447
Less:
Allowance for loan losses	738,230	623,649	623,649	627,259
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,309,586		1,356,547
Less:
Allowance for loan losses	12,840	11,008	11,008	9,983
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	36,378,192		28,516,448
Less:
Allowance for loan losses	73,608	199,011	199,011	210,632
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	2,311,882		1,790,159
Less:
Allowance for loan losses	4,678	10,801	10,801	12,491
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	5,082,863		3,609,744
Less:
Allowance for loan losses	49,835	35,292	35,292	31,908
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,708,023		5,174,912
Less:
Allowance for loan losses	14,289	69,234	69,234	39,716
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,801,569		1,833,194
Less:
Allowance for loan losses	3,645	12,086	12,086	12,255
Consumer
Loans and Allowance for Loan Losses
Total loans	7,652,164		925,901
Less:
Allowance for loan losses	$ 37,206	$ 22,573	$ 22,573	$ 13,659

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Narratives (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Unpaid principal balances	$ 129,967,323	$ 117,670,600
Indirect auto loans | Consumer
Loans and Allowance for Loan Losses
Unpaid principal balances	6,800,000
Mortgage loans
Loans and Allowance for Loan Losses
Unpaid principal balances	19,667,000	21,123,000
Mortgaged-servicing rights
Loans and Allowance for Loan Losses
Servicing asset	$ 132,000	$ 140,000

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Allowance for loan losses (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	$ 983,654
Provision (credit) for loan losses		$ 25,000
Charge-offs	(49,353)
Recoveries	30	751
Balance at end	934,331	983,654
Real estate loan | Residential
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	623,649
Provision (credit) for loan losses	163,934	(3,610)
Charge-offs	(49,353)
Balance at end	738,230	623,649
Real estate loan | Multi-family
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	11,008
Provision (credit) for loan losses	1,832	1,025
Balance at end	12,840	11,008
Real estate loan | Agricultural
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	199,011
Provision (credit) for loan losses	(125,403)	(11,621)
Balance at end	73,608	199,011
Real estate loan | Commercial
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	10,801
Provision (credit) for loan losses	(6,123)	(1,690)
Balance at end	4,678	10,801
Real estate loan | Construction and land
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	35,292
Provision (credit) for loan losses	14,543	3,384
Balance at end	49,835	35,292
Real estate loan | Home equity line of credit (HELOC)
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	69,234
Provision (credit) for loan losses	(54,945)	29,518
Balance at end	14,289	69,234
Commercial and industrial
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	12,086
Provision (credit) for loan losses	(8,441)	(169)
Balance at end	3,645	12,086
Consumer
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	22,573
Provision (credit) for loan losses	14,603	8,163
Recoveries	30	751
Balance at end	$ 37,206	$ 22,573

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	$ 934,331	$ 983,654
Loans Ending balance, evaluated for impairment
Collectively Evaluated	133,805,557	121,518,352
Real estate loan | Residential
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	738,230	623,649
Loans Ending balance, evaluated for impairment
Collectively Evaluated	74,561,278	78,311,447
Real estate loan | Multi-family
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	12,840	11,008
Loans Ending balance, evaluated for impairment
Collectively Evaluated	1,309,586	1,356,547
Real estate loan | Agricultural
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	73,608	199,011
Loans Ending balance, evaluated for impairment
Collectively Evaluated	36,378,192	28,516,448
Real estate loan | Commercial
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	4,678	10,801
Loans Ending balance, evaluated for impairment
Collectively Evaluated	2,311,882	1,790,159
Real estate loan | Construction and land
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	49,835	35,292
Loans Ending balance, evaluated for impairment
Collectively Evaluated	5,082,863	3,609,744
Real estate loan | Home equity line of credit (HELOC)
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	14,289	69,234
Loans Ending balance, evaluated for impairment
Collectively Evaluated	4,708,023	5,174,912
Commercial and industrial
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	3,645	12,086
Loans Ending balance, evaluated for impairment
Collectively Evaluated	1,801,569	1,833,194
Consumer
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	37,206	22,573
Loans Ending balance, evaluated for impairment
Collectively Evaluated	$ 7,652,164	$ 925,901

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Total loans	$ 133,805,557	$ 121,518,352
Pass
Loans and Allowance for Loan Losses
Total loans	133,328,244	121,168,606
Substandard
Loans and Allowance for Loan Losses
Total loans	477,313	349,746
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	74,561,278	78,311,447
Real estate loan | Residential | Pass
Loans and Allowance for Loan Losses
Total loans	74,083,965	77,964,201
Real estate loan | Residential | Substandard
Loans and Allowance for Loan Losses
Total loans	477,313	347,246
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,309,586	1,356,547
Real estate loan | Multi-family | Pass
Loans and Allowance for Loan Losses
Total loans	1,309,586	1,356,547
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	36,378,192	28,516,448
Real estate loan | Agricultural | Pass
Loans and Allowance for Loan Losses
Total loans	36,378,192	28,516,448
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	2,311,882	1,790,159
Real estate loan | Commercial | Pass
Loans and Allowance for Loan Losses
Total loans	2,311,882	1,790,159
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	5,082,863	3,609,744
Real estate loan | Construction and land | Pass
Loans and Allowance for Loan Losses
Total loans	5,082,863	3,609,744
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,708,023	5,174,912
Real estate loan | Home equity line of credit (HELOC) | Pass
Loans and Allowance for Loan Losses
Total loans	4,708,023	5,174,912
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,801,569	1,833,194
Commercial and industrial | Pass
Loans and Allowance for Loan Losses
Total loans	1,801,569	1,833,194
Consumer
Loans and Allowance for Loan Losses
Total loans	7,652,164	925,901
Consumer | Pass
Loans and Allowance for Loan Losses
Total loans	$ 7,652,164	923,401
Consumer | Substandard
Loans and Allowance for Loan Losses
Total loans		$ 2,500

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Aging Analysis (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Loans and Allowance for Loan Losses
Total loans	$ 133,805,557	$ 121,518,352
Loan impaired	0	0	$ 0
30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	488,497	414,826
60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	353,760	65,100
Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans	477,313	349,746
Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,319,570	829,672
Current
Loans and Allowance for Loan Losses
Total loans	132,485,987	120,688,680
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	74,561,278	78,311,447
Real estate loan | Residential | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	482,844	270,843
Real estate loan | Residential | 60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	332,929	65,100
Real estate loan | Residential | Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans	477,313	347,246
Real estate loan | Residential | Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,293,086	683,189
Real estate loan | Residential | Current
Loans and Allowance for Loan Losses
Total loans	73,268,192	77,628,258
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,309,586	1,356,547
Real estate loan | Multi-family | Current
Loans and Allowance for Loan Losses
Total loans	1,309,586	1,356,547
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	36,378,192	28,516,448
Real estate loan | Agricultural | Current
Loans and Allowance for Loan Losses
Total loans	36,378,192	28,516,448
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	2,311,882	1,790,159
Real estate loan | Commercial | Current
Loans and Allowance for Loan Losses
Total loans	2,311,882	1,790,159
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	5,082,863	3,609,744
Real estate loan | Construction and land | Current
Loans and Allowance for Loan Losses
Total loans	5,082,863	3,609,744
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,708,023	5,174,912
Real estate loan | Home equity line of credit (HELOC) | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans		143,983
Real estate loan | Home equity line of credit (HELOC) | Total Past Due
Loans and Allowance for Loan Losses
Total loans		143,983
Real estate loan | Home equity line of credit (HELOC) | Current
Loans and Allowance for Loan Losses
Total loans	4,708,023	5,030,929
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,801,569	1,833,194
Commercial and industrial | Current
Loans and Allowance for Loan Losses
Total loans	1,801,569	1,833,194
Consumer
Loans and Allowance for Loan Losses
Total loans	7,652,164	925,901
Consumer | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	5,653
Consumer | 60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	20,831
Consumer | Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans		2,500
Consumer | Total Past Due
Loans and Allowance for Loan Losses
Total loans	26,484	2,500
Consumer | Current
Loans and Allowance for Loan Losses
Total loans	$ 7,625,680	$ 923,401

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Nonaccrual Loans (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 477,313,000	$ 349,746,000
Real estate loan | Residential
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 477,313	347,246
Consumer
Loans and Allowance for Loan Losses
Nonaccrual loans		$ 2,500

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Loans Modification (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Loans and Allowance for Loan Losses
Loans modified in a troubled debt restructuring	$ 0	$ 0	$ 0
Number of troubled debt restructurings modified in the past 12 months that subsequently defaulted	0	0	0

Premises and Equipment - Major

Premises and Equipment - Major classifications of premises and equipment, stated at cost (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Premises and Equipment
Gross premises and equipment	$ 6,367,202	$ 6,265,509
Less accumulated depreciation	3,765,627	3,657,218
Net premises and equipment	2,601,575	2,608,291
Land
Premises and Equipment
Gross premises and equipment	483,570	483,570
Buildings and improvements
Premises and Equipment
Gross premises and equipment	4,261,697	4,247,815
Furniture and equipment
Premises and Equipment
Gross premises and equipment	$ 1,621,935	$ 1,534,124

Premises and Equipment - Additi

Premises and Equipment - Additional information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Premises and Equipment
Depreciation expense	$ 302,000	$ 190,000

Time Deposits (Details)

Time Deposits (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Time Deposits.
Aggregate amounts of certificates of deposit accounts in denominations of $250,000 thousand dollars or more	$ 3,663,331	$ 2,195,000

Time Deposits - Maturities of t

Time Deposits - Maturities of time deposits (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Time Deposits.
Within one year	$ 26,619,426
One year to two years	4,246,879
Two years to three years	594,876
Three years to four years	405,846
Four years to five years	450,930
Time deposits	$ 32,317,957	$ 25,266,231

Borrowings (Details)

Borrowings (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Borrowings
Federal Home Loan Bank (FHLB) advances outstanding totaling	$ 12,000,000	$ 3,000,000
Federal Home Loan Bank, advances, general debt obligations, collateral pledged	74,469,000
Federal Home Loan Bank, eligible to borrow general debt obligations, collateral pledged	37,603,000
Cash management line of credit
Borrowings
Federal Home Loan Bank (FHLB) advances outstanding totaling	0	0
Federal Home Loan Bank, eligible to borrow general debt obligations, collateral pledged	$ 10	$ 10

Borrowings - Schedule of maturi

Borrowings - Schedule of maturities of FHLB (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Maturities of FHLB advances
Within one year	$ 11,000,000	$ 1,000,000
One year to two years	1,000,000
Total federal home loan banks	$ 12,000,000	$ 3,000,000
Weighted average rate, within one year	5.02%
Weighted average rate, one year to two years	1.11%

Income Taxes - Schedule of prov

Income Taxes - Schedule of provision for income tax components (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Income Taxes
Taxes currently payable	$ 326,960	$ 195,067
Deferred income taxes	(146,745)	(2,013)
Income tax expense	$ 180,215	$ 193,054

Income Taxes - Schedule of reco

Income Taxes - Schedule of reconciliation of federal income tax expense at statutory rate (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Amount:
Computed at statutory rate (21%)	$ 199,452	$ 238,695
Bank-owned life insurance	(12,352)	(11,156)
Nontaxable interest income on municipal securities	(24,121)	(11,130)
Nontaxable life insurance death benefit	(948)	(35,504)
Other	18,184	12,150
Income tax expense	$ 180,215	$ 193,054
Percent of Pretax Income
Statutory rate	21%	21%
Bank-owned life insurance	(1.30%)	(0.98%)
Nontaxable interest income on municipal securities	(2.54%)	(0.98%)
Nontaxable life insurance death benefit	(0.10%)	(3.12%)
Other	1.91%	1.06%
Actual income tax expense	18.97%	16.98%

Income Taxes - Schedule of net

Income Taxes - Schedule of net deferred tax assets and liabilities (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets
Allowance for loan losses	$ 202,051	$ 213,650
Accrued benefits	157,114	122,757
Unrealized losses on available-for-sale securities	228,694	240,187
Charitable contributions	92,946
Other	60,433	52,094
Deferred tax assets	741,238	628,688
Deferred tax liabilities
Depreciation	(121,554)	(62,832)
Federal Home Loan Bank stock dividends	(162,732)	(244,098)
Mortgage servicing rights	(28,593)	(30,402)
Other	(21,055)	(19,305)
Deferred tax liabilities	(333,934)	(356,637)
Net deferred tax asset	$ 407,304	$ 272,051

Income Taxes (Details)

Income Taxes (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Income Taxes
Retained earnings	$ 909,000	$ 909,000
Deferred income tax liability	$ 191,000	$ 191,000

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Total Capital (to Risk-Weighted Assets)
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 21,120	$ 15,800
Total Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.190	0.166
Total Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 8,897	$ 7,613
Total Capital, Amount Required for Capital Adequacy Purposes, Ratio (as a percent)	0.080	0.080
Total capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 11,121	$ 9,516
Total capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	0.100	0.100
Tier I Capital (to Risk-Weighted Assets)
Tier I Capital (to Risk-Weighted Assets), Actual, Amount	$ 20,186	$ 14,816
Tier I Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.182	0.156
Tier I Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 6,672	$ 5,710
Tier I Capital, Amount Required for Capital Adequacy Purposes, Ratio (as a percent)	0.060	0.060
Tier I Capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 8,897	$ 7,613
Tier I Capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	0.080	0.080
Common Equity Tier I Capital (to Risk-Weighted Assets)
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual, Amount	$ 20,186	$ 14,816
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.182	0.156
Common Equity Tier I Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 5,004	$ 4,282
Common Equity Tier I Capital, Amount Required for Capital Adequacy Purposes, Ratio (as a percent)	0.045	0.045
Common Equity Tier I Capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 7,228	$ 6,185
Common Equity Tier I Capital, Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	0.065	0.065
Tier 1 Capital (Average Total Assets)
Tier 1 Capital (Average Total Assets), Actual, Amount	$ 20,186	$ 14,816
Tier 1 Capital (Average Total Assets), Actual, Ratio (as a percent)	0.131	0.097
Tier 1 Capital (Average Total Assets), Amount Required for Capital Adequacy Purposes, Amount	$ 6,158	$ 6,106
Tier 1 Capital (Average Total Assets), Amount Required for Capital Adequacy Purposes, Ratio (as a percent)	0.040	0.040
Tier 1 Capital (Average Total Assets), Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 7,697	$ 7,632
Tier 1 Capital (Average Total Assets), Amount Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	0.050	0.050

Related Party Transactions - Sc

Related Party Transactions - Schedule of bank loans outstanding to certain executive officers, directors and their related interests (Details) - Certain executive officers, directors & their related interests - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$ 1,111,400	$ 1,160,700
New borrowings	585,000	464,800
Repayment	(203,006)	(238,100)
Other		(276,000)
Balance at end of year	$ 1,493,394	$ 1,111,400

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Related Party Transactions
Deposits from related parties	$ 478,000	$ 640,000

Employee Benefits - 401(k) Plan

Employee Benefits - 401(k) Plan (Details) - Other postretirement benefit plan - 401(k) Plan - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Employee Benefits
Eligible service period	1 year
Employer matching contribution (as a percent)	4%
Defined contribution expense	$ 153,000	$ 167,000

Employee Benefits - Director Re

Employee Benefits - Director Retirement Plan (Details) - Other postretirement benefit plan - Director Retirement Plan - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Employee Benefits
Retirement plan expense	$ 44,000	$ 72,000
Retirement plan accrued liability	$ 445,000	$ 565,000

Employee Benefits - Employee St

Employee Benefits - Employee Stock Ownership Plan (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2023	Sep. 30, 2023	Sep. 30, 2023
Employee Benefits
Number of shares in ESOP	81,838
Purchase price of shares held in ESOP (in dollars per share)	$ 10
ESOP loan description			financed by the 15-year term loan with the Company. The interest rate of the loan is 8.50% and the maturity date is December 31, 2037. The loan is secured by shares purchased with the loan proceeds and will be repaid by the ESOP with funds from the Bank’s discretionary contributions to the ESOP.
ESOP loan term			15 years
ESOP loan interest rate		8.50%
Number of allocated ESOP shares		0	0
Number of committed to be released ESOP shares		0	0
Fair value of unallocated ESOP shares		$ 1,129,000	$ 1,129,000
ESOP compensation expense			$ 30,000

Disclosures about Fair Value _3

Disclosures about Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 11,449,715	$ 12,572,195
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	966,720	1,924,453
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,824,770	3,798,074
Mortgage-backed Government Sponsored Enterprises (GSEs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,232,231	3,795,880
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 3,425,994	3,053,788
Foreclosed real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input, extensible list	Measurement Input, Discount Rate [Member]
Foreclosed real estate | Measurement Input, Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.10
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	0
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	0	0
Recurring | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	966,720	1,924,453
Recurring | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,824,770	3,798,074
Recurring | Mortgage-backed Government Sponsored Enterprises (GSEs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,232,231	3,795,880
Recurring | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,425,994	3,053,788
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	966,720	1,924,453
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,824,770	3,798,074
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed Government Sponsored Enterprises (GSEs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,232,231	3,795,880
Recurring | Significant Other Observable Inputs (Level 2) | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,425,994	3,053,788
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value		0
Assets measured at fair value		$ 0
Nonrecurring | Foreclosed real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	54,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Foreclosed real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 54,000

Disclosures about Fair Value _4

Disclosures about Fair Value of Assets and Liabilities - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Financial assets:
Bank owned life insurance	$ 1,783,880	$ 1,742,464
Recurring | Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	6,291,336	14,376,718
Interest-bearing time deposits	100,000	100,000
Loans held for sale	3,094,405
Loans, net	129,967,323	117,670,600
FHLB Stock	1,368,900	1,390,200
Bank owned life insurance	1,783,880	1,742,464
Accrued interest receivable	456,867	376,903
Financial liabilities:
Deposits	122,815,748	134,758,643
FHLB advances	12,000,000	3,000,000
Accrued interest payable	69,434	2,778
Recurring | Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	6,291,336	14,376,718
Interest-bearing time deposits	100,000	100,000
Loans held for sale	3,096,000
Loans, net	115,340,546	106,483,104
FHLB Stock	1,368,900	1,390,200
Bank owned life insurance	1,783,880	1,742,464
Accrued interest receivable	456,867	376,903
Financial liabilities:
Deposits	123,426,791	134,834,412
FHLB advances	12,001,000	3,003,000
Accrued interest payable	69,434	2,778
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	6,291,336	14,376,718
Interest-bearing time deposits	100,000	100,000
Bank owned life insurance	1,783,880	1,742,464
Accrued interest receivable	456,867	376,903
Financial liabilities:
Deposits	90,497,791	109,492,412
Accrued interest payable	69,434	2,778
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets:
FHLB Stock	1,368,900	1,390,200
Financial liabilities:
FHLB advances	12,001,000	3,003,000
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets:
Loans held for sale	3,096,000
Loans, net	115,340,546	106,483,104
Financial liabilities:
Deposits	$ 32,929,000	$ 25,342,000

Commitments and Credit Risks (D

Commitments and Credit Risks (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	$ 11,890,522	$ 12,771,308
Commitments to originate loans
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	2,717,974	3,796,192
Undisbursed balance of loans closed
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	$ 9,172,548	$ 8,975,116

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Components of accumulated other comprehensive income (loss)
Beginning balance	$ 14,056,330	$ 14,062,732
Ending balance	22,784,625	14,056,330
Accumulated Other Comprehensive Income (Loss)
Components of accumulated other comprehensive income (loss)
Beginning balance	(903,562)	46,428
Ending balance	(860,326)	(903,562)
Unrealized gains and losses on available for sale securities
Components of accumulated other comprehensive income (loss)
Beginning balance	(903,562,000)	46,428,000
Other comprehensive income (loss)	37,697,000	(949,990,000)
Reclassification adjustment for realized loss on sale of securities	5,539,000
Ending balance	$ (860,326,000)	$ (903,562,000)

Conversion to Stock Form (Detai

Conversion to Stock Form (Details)	Mar. 03, 2023 $ / shares
Conversion to Stock Form
Share price	$ 10
Subscribe of ESOP	8%