Mercer Bancorp (MSBB) 10-Q 29 Jun 23 2023 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2023	Jun. 29, 2023
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	333-270445
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 Current Reporting Status	No
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		0
Entity Central Index Key	0001967306
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Balance Sheets

Condensed Balance Sheets - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Assets
Cash and due from banks	$ 1,789,272	$ 1,361,198
Interest-bearing deposits in other financial institutions	8,048,522	13,015,520
Cash and cash equivalents	9,837,794	14,376,718
Interest-bearing time deposits	100,000	100,000
Available-for-sale securities	13,270,918	12,572,195
Held-to-maturity securities	190,597	233,388
Loans receivable	119,179,516	118,654,254
Allowance for loan losses	(960,875)	(983,654)
Net loans	118,218,641	117,670,600
Premises and equipment	2,532,567	2,608,291
Federal Home Loan Bank stock	1,067,600	1,390,200
Bank owned life insurance	1,762,774	1,742,464
Accrued interest receivable	427,179	376,903
Federal Home Loan Bank lender risk account	511,522	516,457
Deferred federal income taxes	231,333	272,051
Other assets	873,388	1,023,484
Total assets	149,024,313	152,882,751
Deposits
Demand	59,004,286	65,323,642
Savings and money market	43,269,497	44,168,770
Time	28,754,643	25,266,231
Total deposits	131,028,426	134,758,643
Advances from the Federal Home Loan Bank	2,000,000	3,000,000
Directors plan liability	553,551	565,181
Accrued interest payable and other liabilities	538,622	502,597
Total liabilities	134,120,599	138,826,421
Commitments and Contingencies
Equity
Retained earnings	15,601,793	14,959,892
Accumulated other comprehensive loss	(698,079)	(903,562)
Total equity	14,903,714	14,056,330
Total liabilities and equity	$ 149,024,313	$ 152,882,751

Condensed Statements of Income

Condensed Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Interest Income
Loans	$ 1,257,083	$ 1,053,497	$ 2,479,128	$ 2,125,970
Investment securities	67,743	24,450	134,053	47,024
Interest-bearing deposits and other	115,819	9,722	221,225	20,209
Total interest income	1,440,645	1,087,669	2,834,406	2,193,203
Interest Expense
Deposits	110,571	58,757	159,180	122,272
Federal Home Loan Bank advances	7,052	8,877	14,261	17,951
Total interest expense	117,623	67,634	173,441	140,223
Net Interest Income	1,323,022	1,020,035	2,660,965	2,052,980
Provision for Loan Losses	0	10,000	0	25,000
Net Interest Income After Provision for Loan Losses	1,323,022	1,010,035	2,660,965	2,027,980
Noninterest Income
Service fees on deposits	78,629	75,845	154,544	157,693
Late charges and fees on loans	24,547	29,236	49,488	58,468
Gain on sale of loans	7,951	4,251	7,951	40,691
Loan servicing fees	18,957	15,236	29,023	39,617
Loss on sale of investments			(8,049)
Bank owned life insurance	14,507	11,024	28,888	22,337
Life insurance death benefits			4,515
Other income	4,974	5,720	10,526	10,862
Total noninterest income	149,565	141,312	276,886	329,668
Noninterest Expense
Salaries and employee benefits	538,173	503,028	1,074,133	1,008,405
Directors fees	22,975	21,625	43,150	40,450
Occupancy and equipment	109,485	90,608	222,478	175,237
Data processing fees	133,878	114,158	264,442	222,383
Franchise taxes	29,543	22,241	49,542	43,953
FDIC insurance premiums	9,774	10,155	20,038	20,269
Professional services	51,057	35,384	102,410	87,031
Deposit account services expense	61,655	59,116	122,652	116,550
Advertising	22,418	21,393	44,357	44,352
Loan expenses	18,668	22,803	38,548	43,971
Other	84,139	77,518	160,300	152,102
Total noninterest expense	1,081,765	978,029	2,142,050	1,954,703
Income before income taxes	390,822	173,318	795,801	402,945
Provision for income taxes	77,500	30,531	153,900	80,831
Net Income	$ 313,322	$ 142,787	$ 641,901	$ 322,114

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Loss) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Condensed Statements of Comprehensive Income (Loss)
Net income	$ 313,322	$ 142,787	$ 641,901	$ 322,114
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for-sale securities	81,927	(452,509)	252,055	(519,776)
Reclassification adjustment for realized loss on sales of securities			8,049
Tax (expense) benefit	(17,204)	95,027	(54,621)	109,153
Other comprehensive income (loss)	64,723	(357,482)	205,483	(410,623)
Comprehensive income (loss)	$ 378,045	$ (214,695)	$ 847,384	$ (88,509)

Condensed Statements of Changes

Condensed Statements of Changes in Equity - USD ($)	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at October 1, 2021 at Sep. 30, 2021	$ 14,016,304	$ 46,428	$ 14,062,732
Net income	322,114		322,114
Other comprehensive income / (loss)		(410,623)	(410,623)
Balance at March 31, 2022 at Mar. 31, 2022	14,338,418	(364,195)	13,974,223
Balance at October 1, 2021 at Dec. 31, 2021	14,195,631	(6,713)	14,188,918
Net income	142,787		142,787
Other comprehensive income / (loss)		(357,482)	(357,482)
Balance at March 31, 2022 at Mar. 31, 2022	14,338,418	(364,195)	13,974,223
Balance at October 1, 2021 at Sep. 30, 2022	14,959,892	(903,562)	14,056,330
Net income	641,901		641,901
Other comprehensive income / (loss)		205,483	205,483
Balance at March 31, 2022 at Mar. 31, 2023	15,601,793	(698,079)	14,903,714
Balance at October 1, 2021 at Dec. 31, 2022	15,288,471	(762,802)	14,525,669
Net income	313,322		313,322
Other comprehensive income / (loss)		64,723	64,723
Balance at March 31, 2022 at Mar. 31, 2023	$ 15,601,793	$ (698,079)	$ 14,903,714

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows - USD ($)	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities
Net income	$ 641,901	$ 322,114
Items not requiring (providing) cash:
Depreciation and amortization	148,205	108,546
Amortization of premiums and discounts	30,506	35,484
Amortization of deferred loan fees	(40,130)	(66,225)
Deferred income taxes	(13,903)	126,511
Provision for loan losses		25,000
Gain on sale of loans	(7,951)	(40,691)
Proceeds from sales of loans	286,784	1,950,400
Loans originated for sale	(281,252)	(1,521,850)
Loss on sale of investments	8,049
Life insurance death benefits	(4,515)
Increase in cash surrender value of bank-owned life insurance	(28,888)	(22,337)
Changes in:
Accrued interest receivable	(50,276)	15,890
Other assets	(385,454)	(143,137)
Other liabilities	32,973	(66,418)
Net cash provided by operating activities	336,049	723,287
Investing Activities
Purchases of available-for-sale securities	(1,273,478)	(1,005,500)
Proceeds from sales of available-for-sale securities	527,487	0
Proceeds from calls, maturities and paydowns of available-for-sale securities	270,258	252,920
Principal repayments on securities held-to-maturity	41,350	57,354
Net change in loans	(525,911)	1,019,353
Purchase of premises and equipment	(67,049)	(1,285)
Proceeds from redemption of FHLB stock	322,600
Proceeds from sale of foreclosed real estate	18,000
Proceeds from death benefit of life insurance policies	541,987
Net cash provided by (used in) investing activities	(144,756)	322,842
Financing Activities
Net increase (decrease) in deposit accounts	(3,730,217)	6,401,930
Repayment of FHLB advances	(1,000,000)	(1,000,000)
Net cash (used in) provided by financing activities	(4,730,217)	5,401,930
(Decrease) Increase in Cash and Cash Equivalents	(4,538,924)	6,448,059
Cash and Cash Equivalents, Beginning of Period	14,376,718	18,000,590
Cash and Cash Equivalents, End of Period	9,837,794	24,448,649
Supplemental Disclosure of Cash Flow Information
Interest on deposits and borrowings	$ 146,289	$ 72,857

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 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 Inclusion of Unaudited Information The financial information included herein as of March 31, 2023, and for the interim three and six month periods ended March 31, 2023 and 2022 is unaudited. However, in management’s opinion, the information reflects all normal, recurring adjustments that are necessary for a fair presentation. The results shown for the three and six months ended March 31, 2023 and 2022, are not necessarily indicative of the results to be obtained for a full year. Nature of Operations Mercer Savings Bank (“Bank”) is an Ohio chartered mutual 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, agricultural, commercial, home equity lines of credit and installment loans, and indirect automobile loans. Its operations are conducted through its four office locations in Celina, Ft. Recovery and Greenville, Ohio. The Bank faces competition from other financial institutions and is subject to the regulation of certain federal and state agencies and undergoes periodic examinations by those regulatory authorities. 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. 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 charges-off loans, or portions thereof, when the Bank 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, collateral value 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 collectability 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. Revenue Recognition The Bank 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	6 Months Ended
	Mar. 31, 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 Bank’s accounting for financial instruments. The Bank 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 Bank, including interim periods within those fiscal years. Management is continuing to evaluate the provisions of the ASU.

Debt Securities

Debt Securities	6 Months Ended
	Mar. 31, 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: ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 2,001,657 ​ $ — ​ $ 52,249 ​ $ 1,949,408 U.S. Government agencies ​ 4,017,808 ​ — ​ 187,115 ​ 3,830,693 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,909,479 ​ — ​ 363,120 ​ 3,546,359 State and political subdivisions ​ 4,225,619 ​ 20,060 ​ 301,221 ​ 3,944,458 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 14,154,563 ​ $ 20,060 ​ $ 903,705 ​ $ 13,270,918 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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: ​ ​ ​ ​ March 31, 2023 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 190,597 ​ $ — ​ $ 3,445 ​ $ 187,152 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 March 31, 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 March 31, 2023 ​ ​ Within one year ​ $ 2,254,774 ​ $ 2,213,951 One to five years ​ 4,460,978 ​ 4,242,595 Five to ten years ​ — ​ — After ten years ​ 3,529,332 ​ 3,268,013 ​ ​ 10,245,084 ​ 9,724,559 Mortgage-backed GSEs ​ 3,909,479 ​ 3,546,359 Totals ​ $ 14,154,563 ​ $ 13,270,918 ​ The carrying value of securities pledged as collateral, to secure public deposits and for other purposes, was approximately $500,000 (unaudited) and $460,000 at March 31, 2023 and September 30, 2022, respectively. Proceeds from sales of available for sale securities totaled $527,000 during the six months ended March 31, 2023, resulting in a gross realized loss of $8,049. There were no sales of securities during the six-month period ended March 31, 2022. 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 26 securities at March 31, 2023 (unaudited), and 30 securities at September 30, 2022, was approximately 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 Bank’s investments’ gross unrealized losses and fair value of the Bank’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 March 31, 2023 (unaudited) and September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 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 ​ $ — ​ $ — ​ $ 1,949,408 ​ $ 52,249 ​ $ 1,949,408 ​ $ 52,249 U.S. Government agencies ​ 1,929,114 ​ 86,328 ​ 1,901,579 ​ 100,787 ​ 3,830,693 ​ 187,115 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 1,713,447 ​ 130,306 ​ 1,832,912 ​ 232,814 ​ 3,546,359 ​ 363,120 State and political subdivisions ​ 958,275 ​ 38,481 ​ 1,319,295 ​ 262,740 ​ 2,277,570 ​ 301,221 ​ ​ 4,600,836 ​ 255,115 ​ 7,003,194 ​ 648,590 ​ 11,604,030 ​ 903,705 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 187,152 ​ 3,445 ​ — ​ — ​ 187,152 ​ 3,445 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 4,787,988 ​ $ 258,560 ​ $ 7,003,194 ​ $ 648,590 ​ $ 11,791,182 ​ $ 907,150 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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) ​ 228,084 ​ 5,304 ​ — ​ — ​ 228,084 ​ 5,304 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 8,085,786 ​ $ 831,440 ​ $ 4,483,249 ​ $ 317,814 ​ $ 12,569,035 ​ $ 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 Bank 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 Bank typically does not intend to sell the investments and it is not more likely than not the Bank will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Bank does not consider those investments to be other-than-temporarily impaired at March 31, 2023 (unaudited). Mortgage-backed GSEs The unrealized losses on the Bank’s investment in residential mortgage-backed government sponsored enterprises were caused primarily by changes in interest rates. The Bank 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 Bank typically does not intend to sell the investments and it is not more likely than not the Bank will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Bank does not consider those investments to be other-than-temporarily impaired at March 31, 2023 (unaudited).

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	6 Months Ended
	Mar. 31, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ ​ (In thousands) ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ 75,497 ​ $ 78,312 ​ Multi-family ​ 1,334 ​ 1,356 ​ Agricultural ​ 31,546 ​ 28,516 ​ Commercial ​ 1,766 ​ 1,790 ​ Construction and land ​ 4,135 ​ 3,610 ​ Home equity line of credit (HELOC) ​ 4,456 ​ 5,175 ​ Commercial and industrial ​ 1,766 ​ 1,833 ​ Consumer ​ 1,301 ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ 121,801 ​ 121,518 ​ ​ ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ Undisbursed loans in process ​ 2,297 ​ 2,530 ​ Net deferred loan fees ​ 324 ​ 334 ​ Allowance for loan losses ​ 961 ​ 984 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loans ​ $ 118,219 ​ $ 117,670 ​ ​ Mortgage loans serviced for others are not included in the accompanying balance sheets. The unpaid principal balances of these loans at March 31, 2023 (unaudited) and September 30, 2022, were approximately $20,508,000 and $21,123,000 respectively. The following tables present the activity in the allowance for loan losses based on portfolio segment for ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ January 1, 2023 for loan losses Charge-offs Recoveries March 31, 2023 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 660 ​ $ (13) ​ $ — ​ $ — ​ $ 647 Multi-family ​ 12 ​ (1) ​ — ​ — ​ 11 Agricultural ​ 154 ​ 68 ​ — ​ — ​ 222 Commercial ​ 9 ​ 3 ​ — ​ — ​ 12 Construction and land ​ 39 ​ (4) ​ — ​ — ​ 35 Home equity line of credit (HELOC) ​ 47 ​ (37) ​ — ​ — ​ 10 Commercial and industrial ​ 9 ​ (1) ​ — ​ — ​ 8 Consumer ​ 31 ​ (17) ​ — ​ — ​ 14 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 961 ​ $ (0) ​ $ — ​ $ — ​ $ 961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ January 1, 2022 for loan losses Charge-offs Recoveries March 31, 2022 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 659 ​ $ (25) ​ $ — ​ $ — ​ $ 634 Multi-family ​ 10 ​ (1) ​ — ​ — ​ 9 Agricultural ​ 216 ​ 25 ​ — ​ — ​ 241 Commercial ​ 12 ​ 4 ​ — ​ — ​ 16 Construction and land ​ 12 ​ 1 ​ — ​ — ​ 13 Home equity line of credit (HELOC) ​ 38 ​ 7 ​ — ​ — ​ 45 Commercial and industrial ​ 11 ​ 2 ​ — ​ — ​ 13 Consumer ​ 15 ​ (3) ​ — ​ — ​ 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 973 ​ $ 10 ​ $ — ​ $ — ​ $ 983 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2022 for loan losses Charge-offs Recoveries March 31, 2023 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 624 ​ $ 46 ​ $ (23) ​ $ — ​ $ 647 Multi-family ​ 11 ​ 0 ​ — ​ — ​ 11 Agricultural ​ 199 ​ 23 ​ — ​ — ​ 222 Commercial ​ 11 ​ 1 ​ — ​ — ​ 12 Construction and land ​ 35 ​ 0 ​ — ​ — ​ 35 Home equity line of credit (HELOC) ​ 69 ​ (59) ​ — ​ — ​ 10 Commercial and industrial ​ 12 ​ (4) ​ — ​ — ​ 8 Consumer ​ 23 ​ (9) ​ — ​ — ​ 14 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 984 ​ $ (0) ​ $ (23) ​ $ — ​ $ 961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2021 for loan losses Charge-offs Recoveries March 31, 2022 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 627 ​ $ 7 ​ $ — ​ $ — ​ $ 634 Multi-family ​ 10 ​ (1) ​ — ​ — ​ 9 Agricultural ​ 211 ​ 30 ​ — ​ — ​ 241 Commercial ​ 12 ​ 4 ​ — ​ — ​ 16 Construction and land ​ 32 ​ (19) ​ — ​ — ​ 13 Home equity line of credit (HELOC) ​ 40 ​ 5 ​ — ​ — ​ 45 Commercial and industrial ​ 12 ​ 1 ​ — ​ — ​ 13 Consumer ​ 14 ​ (2) ​ — ​ — ​ 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 958 ​ $ 25 ​ $ — ​ $ — ​ $ 983 ​ 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 March 31, 2023 and September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for loan losses ​ Loans ​ ​ Ending balance, evaluated for impairment ​ Ending balance, evaluated for impairment ​ Individually Collectively Individually Collectively ​ ​ (In thousands) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 647 ​ $ — ​ $ 75,497 Multi-family ​ — ​ 11 ​ — ​ 1,334 Agricultural ​ — ​ 222 ​ — ​ 31,546 Commercial ​ — ​ 12 ​ — ​ 1,766 Construction and land ​ — ​ 35 ​ — ​ 4,135 Home equity line of credit (HELOC) ​ — ​ 10 ​ — ​ 4,456 Commercial and industrial ​ — ​ 8 ​ — ​ 1,766 Consumer ​ — ​ 14 ​ — ​ 1,301 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 961 ​ $ — ​ $ 121,801 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ — ​ $ 624 ​ $ — ​ $ 78,312 Multi-family ​ — ​ 11 ​ — ​ 1,356 Agricultural ​ — ​ 199 ​ — ​ 28,516 Commercial ​ — ​ 11 ​ — ​ 1,790 Construction and land ​ — ​ 35 ​ — ​ 3,610 Home equity line of credit (HELOC) ​ — ​ 69 ​ — ​ 5,175 Commercial and industrial ​ — ​ 12 ​ — ​ 1,833 Consumer ​ — ​ 23 ​ — ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 984 ​ $ — ​ $ 121,518 ​ The Bank has adopted a standard loan grading system for all loans, as follows: Pass. Special Mention. Substandard. 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 Bank’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 Bank’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 Bank’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 Bank’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 Bank’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 Bank’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 March 31, 2023 (unaudited) and September 30, 2022, follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total ​ ​ (In thousands) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 74,909 ​ $ — ​ $ 588 ​ $ — ​ $ 75,497 Multi-family ​ 1,334 ​ — ​ — ​ — ​ 1,334 Agricultural ​ 31,546 ​ — ​ — ​ — ​ 31,546 Commercial ​ 1,766 ​ — ​ — ​ — ​ 1,766 Construction and land ​ 4,135 ​ — ​ — ​ — ​ 4,135 Home equity line of credit (HELOC) ​ 4,456 ​ — ​ — ​ — ​ 4,456 Commercial and industrial ​ 1,766 ​ — ​ — ​ — ​ 1,766 Consumer ​ 1,301 ​ — ​ — ​ — ​ 1,301 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,213 ​ $ — ​ $ 588 ​ $ — ​ $ 121,801 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total ​ (In thousands) September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 77,965 ​ $ — ​ $ 347 ​ $ — ​ $ 78,312 Multi-family ​ 1,356 ​ — ​ — ​ — ​ 1,356 Agricultural ​ 28,516 ​ — ​ — ​ — ​ 28,516 Commercial ​ 1,790 ​ — ​ — ​ — ​ 1,790 Construction and land ​ 3,610 ​ — ​ — ​ — ​ 3,610 Home equity line of credit (HELOC) ​ 5,175 ​ — ​ — ​ — ​ 5,175 Commercial and industrial ​ 1,833 ​ — ​ — ​ — ​ 1,833 Consumer ​ 923 ​ — ​ 3 ​ — ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,168 ​ $ — ​ $ 350 ​ $ — ​ $ 121,518 ​ The Bank 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 six months ended March 31, 2023 (unaudited) or the year ended September 30, 2022. The following tables present the Bank’s loan portfolio aging analysis of the recorded investment in loans as of March 31, 2023 and September 30, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 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 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 260 ​ $ 170 ​ $ 588 ​ $ 1,018 ​ $ 74,479 ​ $ 75,497 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,334 ​ 1,334 ​ — Agricultural ​ — ​ 153 ​ — ​ 153 ​ 31,393 ​ 31,546 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,766 ​ 1,766 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 4,135 ​ 4,135 ​ — Home equity line of credit (HELOC) ​ — ​ — ​ — ​ — ​ 4,456 ​ 4,456 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,766 ​ 1,766 ​ — Consumer ​ 30 ​ — ​ — ​ 30 ​ 1,271 ​ 1,301 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 290 ​ $ 323 ​ $ 588 ​ $ 1,201 ​ $ 120,600 ​ $ 121,801 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 271 ​ $ 65 ​ $ 347 ​ $ 683 ​ $ 77,629 ​ $ 78,312 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,356 ​ 1,356 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 28,516 ​ 28,516 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,790 ​ 1,790 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 3,610 ​ 3,610 ​ — Home equity line of credit (HELOC) ​ 144 ​ — ​ — ​ 144 ​ 5,031 ​ 5,175 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,833 ​ 1,833 ​ — Consumer ​ — ​ — ​ 3 ​ 3 ​ 923 ​ 926 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 415 ​ $ 65 ​ $ 350 ​ $ 830 ​ $ 120,688 ​ $ 121,518 ​ $ — ​ The Bank had no loans identified as impaired as of March 31, 2023 and September 30, 2022, and no loans identified as impaired during the three and six months ended March 31, 2023 and 2022 (unaudited) and during the year ended September 30, 2022. Nonaccrual loans at March 31, 2023 and September 30, 2022, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ ​ (In thousands) ​ Residential real estate loans ​ $ 588 ​ $ 247 ​ Consumer ​ — ​ 3 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 588 ​ $ 250 ​ ​ There were no loans modified in a troubled debt restructuring during the three and six months ended March 31, 2023 and 2022 (unaudited) and during the year ended September 30, 2022. There were no troubled debt restructurings modified in the past 12 months that subsequently defaulted during the three and six months ended March 31, 2023 and 2022 (unaudited) and during the year ended September 30, 2022.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Mar. 31, 2023
Regulatory Matters
Regulatory Matters	Note 5: 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 March 31, 2023 (unaudited) and September 30, 2022, that the Bank met all capital adequacy requirements to which it is subject. As of March 31, 2023 (unaudited), 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 March 31, 2023 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 16,472 ​ 16.9 % $ 7,798 ​ 8.0 % $ 9,747 ​ 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,511 15.9 % $ 5,848 6.0 % $ 7,798 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,511 15.9 % $ 4,386 4.5 % $ 6,336 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 15,511 10.3 % $ 5,998 4.0 % $ 7,498 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 % ​

Disclosures about Fair Value of

Disclosures about Fair Value of Assets and Liabilities	6 Months Ended
	Mar. 31, 2023
Disclosures about Fair Value of Assets and Liabilities
Disclosures about Fair Value of Assets and Liabilities	Note 6: 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 Level 2 Level 3 Recurring Measurements The following table presents the fair value measurements of assets recognized in the accompanying 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 March 31, 2023 (unaudited), and September 30, 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) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 1,949,408 ​ $ 1,949,408 ​ $ — ​ $ — U.S. Government agencies ​ ​ 3,830,693 ​ ​ — ​ ​ 3,830,693 ​ ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,546,359 ​ — ​ 3,546,359 ​ — State and political subdivisions ​ 3,944,458 ​ — ​ 3,944,458 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 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 three and six months ended March 31, 2023 (unaudited) and the year ended September 30, 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 The Bank had no assets or liabilities measured at fair value on a nonrecurring basis at March 31, 2023 (unaudited) and September 30, 2022. The estimated fair values of the Bank’s financial instruments not carried at fair value on the balance sheets are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Carrying ​ Fair ​ Fair Value Measurements Using ​ Value Value Level 1 Level 2 Level 3 March 31, 2023 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 9,837,794 ​ $ 9,837,794 ​ $ 9,837,794 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans, net ​ 118,218,641 ​ 104,997,000 ​ — ​ — ​ 104,997,000 FHLB Stock ​ 1,067,600 ​ 1,067,600 ​ — ​ 1,067,600 ​ — Bank owned life insurance ​ 1,762,774 ​ 1,762,774 ​ 1,762,774 ​ — ​ — Accrued interest receivable ​ 427,179 ​ 421,179 ​ 421,179 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ Deposits ​ 131,028,426 ​ 131,114,783 ​ 102,273,783 ​ — ​ 28,841,000 FHLB advances ​ 2,000,000 ​ 2,002,000 ​ — ​ 2,002,000 ​ — Accrued interest payable ​ 29,930 ​ 29,930 ​ 29,930 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ 106,895,000 ​ — ​ — ​ 106,895,000 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:

Commitments and Credit Risks

Commitments and Credit Risks	6 Months Ended
	Mar. 31, 2023
Commitments and Credit Risks
Commitments and Credit Risks	Note 7: 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ (In thousands) ​ Commitments to originate loans ​ $ 1,705 ​ $ 3,796 Undisbursed balance of loans closed ​ 11,079 ​ ​ 8,975 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 12,784 ​ $ 12,771 ​ ​

Plan of Conversion and Change i

Plan of Conversion and Change in Corporate Form	6 Months Ended
	Mar. 31, 2023
Plan of Conversion and Change in Corporate Form
Plan of Conversion and Change in Corporate Form	Note 8: On March 3, 2023, the Board of Directors of the Bank adopted a plan of conversion (Plan). The Plan is subject to the approval of the Federal Deposit Insurance Corporation and the State of Ohio Division of Financial Institutions and must be approved by the affirmative vote of at least two Mercer Bancorp, Inc. is organized as a corporation under the laws of the State of Maryland and will own all of the outstanding common stock of the Bank upon completion of the conversion. The costs of issuing the common stock will be deferred and deducted from the sales proceeds of the offering. If the conversion is unsuccessful, all deferred costs will be charged to operations. The Bank had incurred $420,158 and $0 in deferred conversion costs as of March 31, 2023 (unaudited) and September 30, 2022, respectively. At the completion of the conversion to stock form, the Bank will establish a liquidation account in the amount of retained earnings at the time of conversion. The liquidation account will be maintained for the benefit of eligible deposit account holders who maintain their accounts in the Bank after conversion. The conversion will be accounted for as a change in corporate form with the historic basis of the Bank’s assets, liabilities and equity unchanged as a result. Mercer Bancorp, Inc. is an emerging growth company, and, for as long as it continues to be an emerging growth company, it may choose to take advantage of exemptions from various reporting requirements applicable to other public companies but not to “emerging growth companies.” Mercer Bancorp, Inc. intends to use the extended transition period to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. Accordingly, its financial statements may not be comparable to the financial statements of public companies that comply with such new or revised accounting standards.

Nature of Operations and Summ_2

Nature of Operations and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2023
Nature of Operations and Summary of Significant Accounting Policies
Nature of Operations	Nature of Operations Mercer Savings Bank (“Bank”) is an Ohio chartered mutual 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, agricultural, commercial, home equity lines of credit and installment loans, and indirect automobile loans. Its operations are conducted through its four office locations in Celina, Ft. Recovery and Greenville, Ohio. The Bank faces competition from other financial institutions and is subject to the regulation of certain federal and state agencies and undergoes periodic examinations by those regulatory authorities.
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.
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 charges-off loans, or portions thereof, when the Bank 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, collateral value 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 collectability 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.
Revenue Recognition	Revenue Recognition The Bank 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.

Debt Securities (Tables)

Debt Securities (Tables)	6 Months Ended
	Mar. 31, 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: ​ ​ ​ ​ ​ ​ ​ ​ March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 2,001,657 ​ $ — ​ $ 52,249 ​ $ 1,949,408 U.S. Government agencies ​ 4,017,808 ​ — ​ 187,115 ​ 3,830,693 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,909,479 ​ — ​ 363,120 ​ 3,546,359 State and political subdivisions ​ 4,225,619 ​ 20,060 ​ 301,221 ​ 3,944,458 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 14,154,563 ​ $ 20,060 ​ $ 903,705 ​ $ 13,270,918 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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: ​ ​ ​ ​ March 31, 2023 ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ $ 190,597 ​ $ — ​ $ 3,445 ​ $ 187,152 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 March 31, 2023 ​ ​ Within one year ​ $ 2,254,774 ​ $ 2,213,951 One to five years ​ 4,460,978 ​ 4,242,595 Five to ten years ​ — ​ — After ten years ​ 3,529,332 ​ 3,268,013 ​ ​ 10,245,084 ​ 9,724,559 Mortgage-backed GSEs ​ 3,909,479 ​ 3,546,359 Totals ​ $ 14,154,563 ​ $ 13,270,918
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	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 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 ​ $ — ​ $ — ​ $ 1,949,408 ​ $ 52,249 ​ $ 1,949,408 ​ $ 52,249 U.S. Government agencies ​ 1,929,114 ​ 86,328 ​ 1,901,579 ​ 100,787 ​ 3,830,693 ​ 187,115 Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 1,713,447 ​ 130,306 ​ 1,832,912 ​ 232,814 ​ 3,546,359 ​ 363,120 State and political subdivisions ​ 958,275 ​ 38,481 ​ 1,319,295 ​ 262,740 ​ 2,277,570 ​ 301,221 ​ ​ 4,600,836 ​ 255,115 ​ 7,003,194 ​ 648,590 ​ 11,604,030 ​ 903,705 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Held to maturity ​ ​ ​ ​ ​ ​ Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 187,152 ​ 3,445 ​ — ​ — ​ 187,152 ​ 3,445 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 4,787,988 ​ $ 258,560 ​ $ 7,003,194 ​ $ 648,590 ​ $ 11,791,182 ​ $ 907,150 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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) ​ 228,084 ​ 5,304 ​ — ​ — ​ 228,084 ​ 5,304 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total temporarily impaired securities ​ $ 8,085,786 ​ $ 831,440 ​ $ 4,483,249 ​ $ 317,814 ​ $ 12,569,035 ​ $ 1,149,254

Loans and Allowance for Loan _2

Loans and Allowance for Loan Losses (Tables)	6 Months Ended
	Mar. 31, 2023
Loans and Allowance for Loan Losses
Schedule of categories of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ ​ (In thousands) ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ 75,497 ​ $ 78,312 ​ Multi-family ​ 1,334 ​ 1,356 ​ Agricultural ​ 31,546 ​ 28,516 ​ Commercial ​ 1,766 ​ 1,790 ​ Construction and land ​ 4,135 ​ 3,610 ​ Home equity line of credit (HELOC) ​ 4,456 ​ 5,175 ​ Commercial and industrial ​ 1,766 ​ 1,833 ​ Consumer ​ 1,301 ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ 121,801 ​ 121,518 ​ ​ ​ ​ ​ ​ ​ ​ ​ Less: ​ ​ ​ Undisbursed loans in process ​ 2,297 ​ 2,530 ​ Net deferred loan fees ​ 324 ​ 334 ​ Allowance for loan losses ​ 961 ​ 984 ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loans ​ $ 118,219 ​ $ 117,670 ​
Schedule of activity in the allowance for loan losses based on portfolio segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ January 1, 2023 for loan losses Charge-offs Recoveries March 31, 2023 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 660 ​ $ (13) ​ $ — ​ $ — ​ $ 647 Multi-family ​ 12 ​ (1) ​ — ​ — ​ 11 Agricultural ​ 154 ​ 68 ​ — ​ — ​ 222 Commercial ​ 9 ​ 3 ​ — ​ — ​ 12 Construction and land ​ 39 ​ (4) ​ — ​ — ​ 35 Home equity line of credit (HELOC) ​ 47 ​ (37) ​ — ​ — ​ 10 Commercial and industrial ​ 9 ​ (1) ​ — ​ — ​ 8 Consumer ​ 31 ​ (17) ​ — ​ — ​ 14 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 961 ​ $ (0) ​ $ — ​ $ — ​ $ 961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three Months Ended March 31, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ January 1, 2022 for loan losses Charge-offs Recoveries March 31, 2022 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 659 ​ $ (25) ​ $ — ​ $ — ​ $ 634 Multi-family ​ 10 ​ (1) ​ — ​ — ​ 9 Agricultural ​ 216 ​ 25 ​ — ​ — ​ 241 Commercial ​ 12 ​ 4 ​ — ​ — ​ 16 Construction and land ​ 12 ​ 1 ​ — ​ — ​ 13 Home equity line of credit (HELOC) ​ 38 ​ 7 ​ — ​ — ​ 45 Commercial and industrial ​ 11 ​ 2 ​ — ​ — ​ 13 Consumer ​ 15 ​ (3) ​ — ​ — ​ 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 973 ​ $ 10 ​ $ — ​ $ — ​ $ 983 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2023 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2022 for loan losses Charge-offs Recoveries March 31, 2023 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 624 ​ $ 46 ​ $ (23) ​ $ — ​ $ 647 Multi-family ​ 11 ​ 0 ​ — ​ — ​ 11 Agricultural ​ 199 ​ 23 ​ — ​ — ​ 222 Commercial ​ 11 ​ 1 ​ — ​ — ​ 12 Construction and land ​ 35 ​ 0 ​ — ​ — ​ 35 Home equity line of credit (HELOC) ​ 69 ​ (59) ​ — ​ — ​ 10 Commercial and industrial ​ 12 ​ (4) ​ — ​ — ​ 8 Consumer ​ 23 ​ (9) ​ — ​ — ​ 14 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 984 ​ $ (0) ​ $ (23) ​ $ — ​ $ 961 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Six Months Ended March 31, 2022 ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ Balance ​ (credit) ​ ​ ​ ​ ​ Balance ​ October 1, 2021 for loan losses Charge-offs Recoveries March 31, 2022 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 627 ​ $ 7 ​ $ — ​ $ — ​ $ 634 Multi-family ​ 10 ​ (1) ​ — ​ — ​ 9 Agricultural ​ 211 ​ 30 ​ — ​ — ​ 241 Commercial ​ 12 ​ 4 ​ — ​ — ​ 16 Construction and land ​ 32 ​ (19) ​ — ​ — ​ 13 Home equity line of credit (HELOC) ​ 40 ​ 5 ​ — ​ — ​ 45 Commercial and industrial ​ 12 ​ 1 ​ — ​ — ​ 13 Consumer ​ 14 ​ (2) ​ — ​ — ​ 12 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 958 ​ $ 25 ​ $ — ​ $ — ​ $ 983
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) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ Residential ​ $ — ​ $ 647 ​ $ — ​ $ 75,497 Multi-family ​ — ​ 11 ​ — ​ 1,334 Agricultural ​ — ​ 222 ​ — ​ 31,546 Commercial ​ — ​ 12 ​ — ​ 1,766 Construction and land ​ — ​ 35 ​ — ​ 4,135 Home equity line of credit (HELOC) ​ — ​ 10 ​ — ​ 4,456 Commercial and industrial ​ — ​ 8 ​ — ​ 1,766 Consumer ​ — ​ 14 ​ — ​ 1,301 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 961 ​ $ — ​ $ 121,801 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ — ​ $ 624 ​ $ — ​ $ 78,312 Multi-family ​ — ​ 11 ​ — ​ 1,356 Agricultural ​ — ​ 199 ​ — ​ 28,516 Commercial ​ — ​ 11 ​ — ​ 1,790 Construction and land ​ — ​ 35 ​ — ​ 3,610 Home equity line of credit (HELOC) ​ — ​ 69 ​ — ​ 5,175 Commercial and industrial ​ — ​ 12 ​ — ​ 1,833 Consumer ​ — ​ 23 ​ — ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ — ​ $ 984 ​ $ — ​ $ 121,518
Schedule of credit quality indicators	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total ​ ​ (In thousands) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 74,909 ​ $ — ​ $ 588 ​ $ — ​ $ 75,497 Multi-family ​ 1,334 ​ — ​ — ​ — ​ 1,334 Agricultural ​ 31,546 ​ — ​ — ​ — ​ 31,546 Commercial ​ 1,766 ​ — ​ — ​ — ​ 1,766 Construction and land ​ 4,135 ​ — ​ — ​ — ​ 4,135 Home equity line of credit (HELOC) ​ 4,456 ​ — ​ — ​ — ​ 4,456 Commercial and industrial ​ 1,766 ​ — ​ — ​ — ​ 1,766 Consumer ​ 1,301 ​ — ​ — ​ — ​ 1,301 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,213 ​ $ — ​ $ 588 ​ $ — ​ $ 121,801 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass Mention Substandard Doubtful Total ​ (In thousands) September 30, 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 77,965 ​ $ — ​ $ 347 ​ $ — ​ $ 78,312 Multi-family ​ 1,356 ​ — ​ — ​ — ​ 1,356 Agricultural ​ 28,516 ​ — ​ — ​ — ​ 28,516 Commercial ​ 1,790 ​ — ​ — ​ — ​ 1,790 Construction and land ​ 3,610 ​ — ​ — ​ — ​ 3,610 Home equity line of credit (HELOC) ​ 5,175 ​ — ​ — ​ — ​ 5,175 Commercial and industrial ​ 1,833 ​ — ​ — ​ — ​ 1,833 Consumer ​ 923 ​ — ​ 3 ​ — ​ 926 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ $ 121,168 ​ $ — ​ $ 350 ​ $ — ​ $ 121,518
Schedule of loan portfolio aging analysis of the recorded investment in loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, 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 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 260 ​ $ 170 ​ $ 588 ​ $ 1,018 ​ $ 74,479 ​ $ 75,497 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,334 ​ 1,334 ​ — Agricultural ​ — ​ 153 ​ — ​ 153 ​ 31,393 ​ 31,546 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,766 ​ 1,766 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 4,135 ​ 4,135 ​ — Home equity line of credit (HELOC) ​ — ​ — ​ — ​ — ​ 4,456 ​ 4,456 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,766 ​ 1,766 ​ — Consumer ​ 30 ​ — ​ — ​ 30 ​ 1,271 ​ 1,301 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 290 ​ $ 323 ​ $ 588 ​ $ 1,201 ​ $ 120,600 ​ $ 121,801 ​ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ (In thousands) Real estate loans: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential ​ $ 271 ​ $ 65 ​ $ 347 ​ $ 683 ​ $ 77,629 ​ $ 78,312 ​ $ — Multi-family ​ — ​ — ​ — ​ — ​ 1,356 ​ 1,356 ​ — Agricultural ​ — ​ — ​ — ​ — ​ 28,516 ​ 28,516 ​ — Commercial ​ — ​ — ​ — ​ — ​ 1,790 ​ 1,790 ​ — Construction and land ​ — ​ — ​ — ​ — ​ 3,610 ​ 3,610 ​ — Home equity line of credit (HELOC) ​ 144 ​ — ​ — ​ 144 ​ 5,031 ​ 5,175 ​ — Commercial and industrial ​ — ​ — ​ — ​ — ​ 1,833 ​ 1,833 ​ — Consumer ​ — ​ — ​ 3 ​ 3 ​ 923 ​ 926 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 415 ​ $ 65 ​ $ 350 ​ $ 830 ​ $ 120,688 ​ $ 121,518 ​ $ —
Schedule of Nonaccrual loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ ​ (In thousands) ​ Residential real estate loans ​ $ 588 ​ $ 247 ​ Consumer ​ — ​ 3 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 588 ​ $ 250 ​

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Mar. 31, 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 March 31, 2023 ​ ​ ​ ​ Total Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 16,472 ​ 16.9 % $ 7,798 ​ 8.0 % $ 9,747 ​ 10.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier 1 Capital ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,511 15.9 % $ 5,848 6.0 % $ 7,798 8.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common Equity Tier I Capital ​ ​ ​ ​ (to Risk-Weighted Assets) ​ $ 15,511 15.9 % $ 4,386 4.5 % $ 6,336 6.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Tier I Capital ​ ​ ​ ​ (to Average Total Assets) ​ $ 15,511 10.3 % $ 5,998 4.0 % $ 7,498 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 %

Disclosures about Fair Value _2

Disclosures about Fair Value of Assets and Liabilities (Tables)	6 Months Ended
	Mar. 31, 2023
Disclosures about Fair Value of Assets and Liabilities
Schedule of fair value measurements of assets measured at fair value on a 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) March 31, 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury securities ​ $ 1,949,408 ​ $ 1,949,408 ​ $ — ​ $ — U.S. Government agencies ​ ​ 3,830,693 ​ ​ — ​ ​ 3,830,693 ​ ​ — Mortgage-backed Government Sponsored Enterprises (GSEs) ​ 3,546,359 ​ — ​ 3,546,359 ​ — State and political subdivisions ​ 3,944,458 ​ — ​ 3,944,458 ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ —
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 March 31, 2023 ​ ​ ​ ​ ​ Financial assets: ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 9,837,794 ​ $ 9,837,794 ​ $ 9,837,794 ​ $ — ​ $ — Interest-bearing time deposits ​ 100,000 ​ 100,000 ​ 100,000 ​ — ​ — Loans, net ​ 118,218,641 ​ 104,997,000 ​ — ​ — ​ 104,997,000 FHLB Stock ​ 1,067,600 ​ 1,067,600 ​ — ​ 1,067,600 ​ — Bank owned life insurance ​ 1,762,774 ​ 1,762,774 ​ 1,762,774 ​ — ​ — Accrued interest receivable ​ 427,179 ​ 421,179 ​ 421,179 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ Deposits ​ 131,028,426 ​ 131,114,783 ​ 102,273,783 ​ — ​ 28,841,000 FHLB advances ​ 2,000,000 ​ 2,002,000 ​ — ​ 2,002,000 ​ — Accrued interest payable ​ 29,930 ​ 29,930 ​ 29,930 ​ — ​ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ 106,895,000 ​ — ​ — ​ 106,895,000 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 ​ — ​ —

Commitments and Credit Risks (T

Commitments and Credit Risks (Tables)	6 Months Ended
	Mar. 31, 2023
Commitments and Credit Risks
Schedule of commitments outstanding	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ March 31, ​ September 30, ​ ​ 2023 2022 ​ (In thousands) ​ Commitments to originate loans ​ $ 1,705 ​ $ 3,796 Undisbursed balance of loans closed ​ 11,079 ​ ​ 8,975 ​ ​ ​ ​ ​ ​ ​ ​ ​ Total ​ $ 12,784 ​ $ 12,771 ​

Nature of Operations and Summ_3

Nature of Operations and Summary of Significant Accounting Policies (Details)	6 Months Ended
	Mar. 31, 2023 location
Nature of Operations and Summary of Significant Accounting Policies
Number of office location	4

Debt Securities - Available for

Debt Securities - Available for Sale Debt Securities Fair Value to Amortized Cost (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Available-for-sale Securities:
Amortized cost	$ 14,154,563	$ 13,715,944
Gross Unrealized Gains	20,060	201
Gross Unrealized Losses	903,705	1,143,950
Approximate Fair Value	13,270,918	12,572,195
U.S. Treasury securities
Available-for-sale Securities:
Amortized cost	2,001,657	2,008,695
Gross Unrealized Losses	52,249	84,242
Approximate Fair Value	1,949,408	1,924,453
U.S. Government agencies
Available-for-sale Securities:
Amortized cost	4,017,808	4,025,948
Gross Unrealized Losses	187,115	227,874
Approximate Fair Value	3,830,693	3,798,074
Mortgage-backed Government Sponsored Enterprises (GSEs)
Available-for-sale Securities:
Amortized cost	3,909,479	4,191,085
Gross Unrealized Losses	363,120	395,205
Approximate Fair Value	3,546,359	3,795,880
State and political subdivisions
Available-for-sale Securities:
Amortized cost	4,225,619	3,490,216
Gross Unrealized Gains	20,060	201
Gross Unrealized Losses	301,221	436,629
Approximate Fair Value	$ 3,944,458	$ 3,053,788

Debt Securities - Held-to-Matur

Debt Securities - Held-to-Maturity Fair Value to Amortized Cost (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Held-to-maturity Securities:
Held-to-maturity securities	$ 190,597	$ 233,388
Mortgage-backed Government Sponsored Enterprises (GSEs)
Held-to-maturity Securities:
Amortized Cost	190,597	233,388
Gross Unrealized Losses	3,445	5,304
Held-to-maturity securities	$ 187,152	$ 228,084

Debt Securities - Amortized Cos

Debt Securities - Amortized Cost and Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Amortized cost
Within one year	$ 2,254,774
One to five years	4,460,978
After ten years	3,529,332
Total, single maturity date	10,245,084
Amortized cost	14,154,563	$ 13,715,944
Fair value
Within one year	2,213,951
One to five years	4,242,595
After ten years	3,268,013
Total, single maturity date	9,724,559
Totals	13,270,918	12,572,195
Mortgage-backed Government Sponsored Enterprises (GSEs)
Amortized cost
Without single maturity date	3,909,479
Amortized cost	3,909,479	4,191,085
Fair value
Without single maturity date	3,546,359
Totals	$ 3,546,359	$ 3,795,880

Debt Securities - Narratives (D

Debt Securities - Narratives (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) security	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($) security
Debt Securities
Carrying value of securities	$ 500,000		$ 500,000		$ 460,000
Debt Securities, Available-for-Sale, Restriction Type [Extensible Enumeration]	us-gaap:AssetPledgedAsCollateralMember		us-gaap:AssetPledgedAsCollateralMember		us-gaap:AssetPledgedAsCollateralMember
Proceeds from sales of available-for-sale securities	$ 0	$ 0	$ 527,487	$ 0
Gross realized loss			$ (8,049)
Number of positions | security			26		30
Total fair value of these investments	$ 11,791,182		$ 11,791,182		$ 12,569,035
Percentage of fair value	88%		88%		98%

Debt Securities - Continuous Un

Debt Securities - Continuous Unrealized Loss Position (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Available for sale, Fair Value:
Less than 12 Months, Fair Value	$ 4,600,836	$ 7,857,702
12 Months or More, Fair Value	7,003,194	4,483,249
Total, Fair Value	11,604,030	12,340,951
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	255,115	826,136
12 Months or More, Unrealized Losses	648,590	317,814
Total, Unrealized Losses	903,705	1,143,950
Total temporarily impaired securities, Fair Value:
Less than 12 Months, Fair Value	4,787,988	8,085,786
12 Months or More, Fair Value	7,003,194	4,483,249
Total, Fair Value	11,791,182	12,569,035
Total temporarily impaired securities, Unrealized Losses:
Less than 12 Months, Unrealized Losses	258,560	831,440
12 Months or More, Unrealized Losses	648,590	317,814
Total, Unrealized Losses	907,150	1,149,254
U.S. Treasury securities
Available for sale, Fair Value:
12 Months or More, Fair Value	1,949,408	1,924,453
Total, Fair Value	1,949,408	1,924,453
Available for sale, Unrealized Losses:
12 Months or More, Unrealized Losses	52,249	84,242
Total, Unrealized Losses	52,249	84,242
U.S. Government agencies
Available for sale, Fair Value:
Less than 12 Months, Fair Value	1,929,114	1,924,522
12 Months or More, Fair Value	1,901,579	1,873,552
Total, Fair Value	3,830,693	3,798,074
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	86,328	98,137
12 Months or More, Unrealized Losses	100,787	129,737
Total, Unrealized Losses	187,115	227,874
Mortgage-backed Government Sponsored Enterprises (GSEs)
Available for sale, Fair Value:
Less than 12 Months, Fair Value	1,713,447	3,110,636
12 Months or More, Fair Value	1,832,912	685,244
Total, Fair Value	3,546,359	3,795,880
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	130,306	291,370
12 Months or More, Unrealized Losses	232,814	103,835
Total, Unrealized Losses	363,120	395,205
Held to maturity, Fair Value:
Less than 12 Months, Fair Value	187,152	228,084
Total, Fair Value	187,152	228,084
Held to maturity, Unrealized Losses:
Less than 12 Months, Unrealized Losses	3,445	5,304
Total, Unrealized Losses	3,445	5,304
State and political subdivisions
Available for sale, Fair Value:
Less than 12 Months, Fair Value	958,275	2,822,544
12 Months or More, Fair Value	1,319,295
Total, Fair Value	2,277,570	2,822,544
Available for sale, Unrealized Losses:
Less than 12 Months, Unrealized Losses	38,481	436,629
12 Months or More, Unrealized Losses	262,740
Total, Unrealized Losses	$ 301,221	$ 436,629

Loans and Allowance for Loan _3

Loans and Allowance for Loan Losses - Categories of Loans (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Loans and Allowance for Loan Losses
Total loans	$ 121,801,000		$ 121,518,000
Less:
Undisbursed loans in process	2,297,000		2,530,000
Net deferred loan fees	324,000		334,000
Allowance for loan losses	960,875	$ 961,000	983,654	$ 983,000	$ 973,000	$ 958,000
Net loans	118,218,641		117,670,600
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	75,497,000		78,312,000
Less:
Allowance for loan losses	647,000	660,000	624,000	634,000	659,000	627,000
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,334,000		1,356,000
Less:
Allowance for loan losses	11,000	12,000	11,000	9,000	10,000	10,000
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	31,546,000		28,516,000
Less:
Allowance for loan losses	222,000	154,000	199,000	241,000	216,000	211,000
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	1,766,000		1,790,000
Less:
Allowance for loan losses	12,000	9,000	11,000	16,000	12,000	12,000
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	4,135,000		3,610,000
Less:
Allowance for loan losses	35,000	39,000	35,000	13,000	12,000	32,000
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,456,000		5,175,000
Less:
Allowance for loan losses	10,000	47,000	69,000	45,000	38,000	40,000
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,766,000		1,833,000
Less:
Allowance for loan losses	8,000	9,000	12,000	13,000	11,000	12,000
Consumer
Loans and Allowance for Loan Losses
Total loans	1,301,000		926,000
Less:
Allowance for loan losses	$ 14,000	$ 31,000	$ 23,000	$ 12,000	$ 15,000	$ 14,000

Loans and Allowance for Loan _4

Loans and Allowance for Loan Losses - Narratives (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Unpaid principal balances	$ 118,218,641	$ 117,670,600
Mortgage loans
Loans and Allowance for Loan Losses
Unpaid principal balances	$ 20,508,000	$ 21,123,000

Loans and Allowance for Loan _5

Loans and Allowance for Loan Losses - Allowance for loan losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	$ 961,000	$ 973,000	$ 983,654	$ 958,000
Provision (credit) for loan losses	0	10,000	0	25,000
Charge-offs			(23,000)
Balance at end	960,875	983,000	960,875	983,000
Real estate loan | Residential
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	660,000	659,000	624,000	627,000
Provision (credit) for loan losses	(13,000)	(25,000)	46,000	7,000
Charge-offs			(23,000)
Balance at end	647,000	634,000	647,000	634,000
Real estate loan | Multi-family
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	12,000	10,000	11,000	10,000
Provision (credit) for loan losses	(1,000)	(1,000)	0	(1,000)
Balance at end	11,000	9,000	11,000	9,000
Real estate loan | Agricultural
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	154,000	216,000	199,000	211,000
Provision (credit) for loan losses	68,000	25,000	23,000	30,000
Balance at end	222,000	241,000	222,000	241,000
Real estate loan | Commercial
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	9,000	12,000	11,000	12,000
Provision (credit) for loan losses	3,000	4,000	1,000	4,000
Balance at end	12,000	16,000	12,000	16,000
Real estate loan | Construction and land
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	39,000	12,000	35,000	32,000
Provision (credit) for loan losses	(4,000)	1,000	0	(19,000)
Balance at end	35,000	13,000	35,000	13,000
Real estate loan | Home equity line of credit (HELOC)
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	47,000	38,000	69,000	40,000
Provision (credit) for loan losses	(37,000)	7,000	(59,000)	5,000
Balance at end	10,000	45,000	10,000	45,000
Commercial and industrial
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	9,000	11,000	12,000	12,000
Provision (credit) for loan losses	(1,000)	2,000	(4,000)	1,000
Balance at end	8,000	13,000	8,000	13,000
Consumer
Activity in the allowance for loan losses based on portfolio segment
Balance at beginning	31,000	15,000	23,000	14,000
Provision (credit) for loan losses	(17,000)	(3,000)	(9,000)	(2,000)
Balance at end	$ 14,000	$ 12,000	$ 14,000	$ 12,000

Loans and Allowance for Loan _6

Loans and Allowance for Loan Losses - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	$ 961	$ 984
Loans Ending balance, evaluated for impairment
Collectively Evaluated	121,801	121,518
Real estate loan | Residential
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	647	624
Loans Ending balance, evaluated for impairment
Collectively Evaluated	75,497	78,312
Real estate loan | Multi-family
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	11	11
Loans Ending balance, evaluated for impairment
Collectively Evaluated	1,334	1,356
Real estate loan | Agricultural
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	222	199
Loans Ending balance, evaluated for impairment
Collectively Evaluated	31,546	28,516
Real estate loan | Commercial
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	12	11
Loans Ending balance, evaluated for impairment
Collectively Evaluated	1,766	1,790
Real estate loan | Construction and land
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	35	35
Loans Ending balance, evaluated for impairment
Collectively Evaluated	4,135	3,610
Real estate loan | Home equity line of credit (HELOC)
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	10	69
Loans Ending balance, evaluated for impairment
Collectively Evaluated	4,456	5,175
Commercial and industrial
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	8	12
Loans Ending balance, evaluated for impairment
Collectively Evaluated	1,766	1,833
Consumer
Allowance for loan losses Ending balance, evaluated for impairment
Collectively Evaluated	14	23
Loans Ending balance, evaluated for impairment
Collectively Evaluated	$ 1,301	$ 926

Loans and Allowance for Loan _7

Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Total loans	$ 121,801	$ 121,518
Pass
Loans and Allowance for Loan Losses
Total loans	121,213	121,168
Substandard
Loans and Allowance for Loan Losses
Total loans	588	350
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	75,497	78,312
Real estate loan | Residential | Pass
Loans and Allowance for Loan Losses
Total loans	74,909	77,965
Real estate loan | Residential | Substandard
Loans and Allowance for Loan Losses
Total loans	588	347
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,334	1,356
Real estate loan | Multi-family | Pass
Loans and Allowance for Loan Losses
Total loans	1,334	1,356
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	31,546	28,516
Real estate loan | Agricultural | Pass
Loans and Allowance for Loan Losses
Total loans	31,546	28,516
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	1,766	1,790
Real estate loan | Commercial | Pass
Loans and Allowance for Loan Losses
Total loans	1,766	1,790
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	4,135	3,610
Real estate loan | Construction and land | Pass
Loans and Allowance for Loan Losses
Total loans	4,135	3,610
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,456	5,175
Real estate loan | Home equity line of credit (HELOC) | Pass
Loans and Allowance for Loan Losses
Total loans	4,456	5,175
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,766	1,833
Commercial and industrial | Pass
Loans and Allowance for Loan Losses
Total loans	1,766	1,833
Consumer
Loans and Allowance for Loan Losses
Total loans	1,301	926
Consumer | Pass
Loans and Allowance for Loan Losses
Total loans	$ 1,301	923
Consumer | Substandard
Loans and Allowance for Loan Losses
Total loans		$ 3

Loans and Allowance for Loan _8

Loans and Allowance for Loan Losses - Aging Analysis (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Loans and Allowance for Loan Losses
Total loans	$ 121,801,000	$ 121,518,000
Loan impaired	0	0	$ 0
30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	290,000	415,000
60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	323,000	65,000
Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans	588,000	350,000
Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,201,000	830,000
Current
Loans and Allowance for Loan Losses
Total loans	120,600,000	120,688,000
Real estate loan | Residential
Loans and Allowance for Loan Losses
Total loans	75,497,000	78,312,000
Real estate loan | Residential | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	260,000	271,000
Real estate loan | Residential | 60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	170,000	65,000
Real estate loan | Residential | Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans	588,000	347,000
Real estate loan | Residential | Total Past Due
Loans and Allowance for Loan Losses
Total loans	1,018,000	683,000
Real estate loan | Residential | Current
Loans and Allowance for Loan Losses
Total loans	74,479,000	77,629,000
Real estate loan | Multi-family
Loans and Allowance for Loan Losses
Total loans	1,334,000	1,356,000
Real estate loan | Multi-family | Current
Loans and Allowance for Loan Losses
Total loans	1,334,000	1,356,000
Real estate loan | Agricultural
Loans and Allowance for Loan Losses
Total loans	31,546,000	28,516,000
Real estate loan | Agricultural | 60 - 89 Days Past Due
Loans and Allowance for Loan Losses
Total loans	153,000
Real estate loan | Agricultural | Total Past Due
Loans and Allowance for Loan Losses
Total loans	153,000
Real estate loan | Agricultural | Current
Loans and Allowance for Loan Losses
Total loans	31,393,000	28,516,000
Real estate loan | Commercial
Loans and Allowance for Loan Losses
Total loans	1,766,000	1,790,000
Real estate loan | Commercial | Current
Loans and Allowance for Loan Losses
Total loans	1,766,000	1,790,000
Real estate loan | Construction and land
Loans and Allowance for Loan Losses
Total loans	4,135,000	3,610,000
Real estate loan | Construction and land | Current
Loans and Allowance for Loan Losses
Total loans	4,135,000	3,610,000
Real estate loan | Home equity line of credit (HELOC)
Loans and Allowance for Loan Losses
Total loans	4,456,000	5,175,000
Real estate loan | Home equity line of credit (HELOC) | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans		144,000
Real estate loan | Home equity line of credit (HELOC) | Total Past Due
Loans and Allowance for Loan Losses
Total loans		144,000
Real estate loan | Home equity line of credit (HELOC) | Current
Loans and Allowance for Loan Losses
Total loans	4,456,000	5,031,000
Commercial and industrial
Loans and Allowance for Loan Losses
Total loans	1,766,000	1,833,000
Commercial and industrial | Current
Loans and Allowance for Loan Losses
Total loans	1,766,000	1,833,000
Consumer
Loans and Allowance for Loan Losses
Total loans	1,301,000	926,000
Consumer | 30 - 59 Days Past Due
Loans and Allowance for Loan Losses
Total loans	30,000
Consumer | Greater than 90 Days Past Due
Loans and Allowance for Loan Losses
Total loans		3,000
Consumer | Total Past Due
Loans and Allowance for Loan Losses
Total loans	30,000	3,000
Consumer | Current
Loans and Allowance for Loan Losses
Total loans	$ 1,271,000	$ 923,000

Loans and Allowance for Loan _9

Loans and Allowance for Loan Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 588	$ 250
Real estate loan | Residential
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 588	247
Consumer
Loans and Allowance for Loan Losses
Nonaccrual loans		$ 3

Loans and Allowance for Loan_10

Loans and Allowance for Loan Losses - Loans Modification (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)
Loans and Allowance for Loan Losses
Loans modified in a troubled debt restructuring	$ 0	$ 0	$ 0	$ 0	$ 0
Number of troubled debt restructurings modified in the past 12 months that subsequently defaulted	0	0	0	0	0

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)
Total Capital (to Risk-Weighted Assets)
Total Capital (to Risk-Weighted Assets), Actual, Amount	$ 16,472	$ 15,800
Total Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.169	0.166
Total Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 7,798	$ 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	$ 9,747	$ 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	$ 15,511	$ 14,816
Tier I Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.159	0.156
Tier I Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 5,848	$ 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	$ 7,798	$ 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	$ 15,511	$ 14,816
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual, Ratio (as a percent)	0.159	0.156
Common Equity Tier I Capital, Amount Required for Capital Adequacy Purposes, Amount	$ 4,386	$ 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	$ 6,336	$ 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	$ 15,511	$ 14,816
Tier 1 Capital (Average Total Assets), Actual, Ratio (as a percent)	0.103	0.097
Tier 1 Capital (Average Total Assets), Amount Required for Capital Adequacy Purposes, Amount	$ 5,998	$ 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	$ 7,498	$ 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

Disclosures about Fair Value _3

Disclosures about Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 13,270,918	$ 12,572,195
U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,949,408	1,924,453
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,830,693	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	3,546,359	3,795,880
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,944,458	3,053,788
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	1,949,408	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	3,830,693	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	3,546,359	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	3,944,458	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	1,949,408	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	3,830,693	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	3,546,359	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	3,944,458	3,053,788
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	0	0
Assets measured at fair value	$ 0	$ 0

Disclosures about Fair Value _4

Disclosures about Fair Value of Assets and Liabilities - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - Recurring - USD ($)	Mar. 31, 2023	Sep. 30, 2022
Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	$ 9,837,794	$ 14,376,718
Interest-bearing time deposits	100,000	100,000
Loans, net	118,218,641	117,670,600
FHLB Stock	1,067,600	1,390,200
Bank owned life insurance	1,762,774	1,742,464
Accrued interest receivable	427,179	376,903
Financial liabilities:
Deposits	131,028,426	134,758,643
FHLB advances	2,000,000	3,000,000
Accrued interest payable	29,930	2,778
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	9,837,794	14,376,718
Interest-bearing time deposits	100,000	100,000
Loans, net	104,997,000	106,895,000
FHLB Stock	1,067,600	1,390,200
Bank owned life insurance	1,762,774	1,742,464
Accrued interest receivable	421,179	376,903
Financial liabilities:
Deposits	131,114,783	134,834,412
FHLB advances	2,002,000	3,003,000
Accrued interest payable	29,930	2,778
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	9,837,794	14,376,718
Interest-bearing time deposits	100,000	100,000
Bank owned life insurance	1,762,774	1,742,464
Accrued interest receivable	421,179	376,903
Financial liabilities:
Deposits	102,273,783	109,492,412
Accrued interest payable	29,930	2,778
Significant Other Observable Inputs (Level 2)
Financial assets:
FHLB Stock	1,067,600	1,390,200
Financial liabilities:
FHLB advances	2,002,000	3,003,000
Significant Unobservable Inputs (Level 3)
Financial assets:
Loans, net	104,997,000	106,895,000
Financial liabilities:
Deposits	$ 28,841,000	$ 25,342,000

Commitments and Credit Risks (D

Commitments and Credit Risks (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	$ 12,784	$ 12,771
Commitments to originate loans
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	1,705	3,796
Undisbursed balance of loans closed
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Commitments outstanding	$ 11,079	$ 8,975

Plan of Conversion and Change_2

Plan of Conversion and Change in Corporate Form (Details) - USD ($)	Mar. 03, 2023	Mar. 31, 2023	Sep. 30, 2022
Plan of Conversion and Change in Corporate Form
Percentage of voting rights	66%
Share price	$ 10
Subscribe of ESOP	8%
Deferred offering costs		$ 420,158	$ 0