Prudential Bancorp (PBIP) 10-K17 Dec 212021 FY Annual reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Sep. 30, 2021	Dec. 08, 2021	Mar. 31, 2021
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity Registrant Name	PRUDENTIAL BANCORP, INC.
Entity Central Index Key	0001578776
Entity File Number	000-55084
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	46-2935427
Entity Address, Address Line One	1834 WEST OREGON AVENUE
Entity Address, City or Town	PHILADELPHIA
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19145
City Area Code	215
Local Phone Number	755-1500
Title of 12(b) Security	Common Stock
Trading Symbol	PBIP
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
ICFR Auditor Attestation Flag	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 111.3
Entity Common Stock Shares Outstanding		7,769,387
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY

CONSOLIDATED STATEMENT OF FINAN

CONSOLIDATED STATEMENT OF FINANCIAL CONDITION - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
ASSETS
Cash and amounts due from depository institutions	$ 2,233	$ 2,781
Interest-bearing deposits	80,465	114,300
Total cash and cash equivalents	82,698	117,081
Certificates of deposit	1,106	2,102
Investment and mortgage-backed securities available for sale at fair value	305,947	420,364
Investment and mortgage-backed securities held to maturity (fair value-September 30, 2021, $21,161; September 30, 2020, $24,330)	20,074	22,860
Equity securities	22	51
Loans receivable-net of allowance for loan losses (September 30, 2021, $8,517; September 30, 2020, $8,303)	618,206	588,300
Accrued interest receivable	4,326	4,699
Other real estate owned	4,109
Restricted bank stock-at cost	10,091	12,532
Office properties and equipment-net	6,850	7,129
Bank owned life insurance (BOLI)	33,116	32,498
Deferred income taxes, net	3,021	3,902
Goodwill	6,102	6,102
Core deposit intangible	246	340
Prepaid expenses and other assets	4,554	5,393
TOTAL ASSETS	1,100,468	1,223,353
Deposits:
Non-interest-bearing	37,409	30,002
Interest-bearing	674,106	740,947
Total deposits	711,515	770,949
Advances from Federal Home Loan Bank - short term		25,000
Advances from Federal Home Loan Bank - long term	232,025	260,253
Accrued interest payable	2,558	3,374
Advances from borrowers for taxes and insurance	1,698	2,798
Interest rate swap contracts	12,834	20,960
Accounts payable and accrued expenses	9,382	10,902
Total liabilities	970,012	1,094,236
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued
Common stock, $.01 par value, 40,000,000 shares authorized; 10,819,006 issued and 7,769,387 outstanding at September 30, 2021; 10,819,006 issued and 8,138,675 outstanding at September 30, 2020	108	108
Additional paid-in capital	118,424	118,270
Treasury stock, at cost: 3,049,619 shares at September 30, 2021 and 2,680,331 shares at September 30, 2020	(44,351)	(39,207)
Retained earnings	58,450	52,889
Accumulated other comprehensive (loss) income	(2,175)	(2,943)
Total stockholders' equity	130,456	129,117
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 1,100,468	$ 1,223,353

CONSOLIDATED STATEMENT OF FIN_2

CONSOLIDATED STATEMENT OF FINANCIAL CONDITION (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENT OF FINANCIAL CONDITION
Investment and mortgage-backed securities held to maturity, fair value (in dollars)	$ 21,161	$ 24,330
Allowance for loan losses on loans receivable (in dollars)	$ 8,517	$ 8,303
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	10,819,006	10,819,006
Common stock, shares outstanding	7,769,387	8,138,675
Number of treasury share purchased	3,049,619	2,680,331

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
INTEREST INCOME:
Interest and fees on loans	$ 25,661,000	$ 25,141,000	$ 26,737,000
Interest on mortgage-backed securities	5,445,000	9,197,000	9,561,000
Interest and dividends on investments	6,816,000	6,942,000	6,782,000
Interest on interest-bearing deposits	115,000	947,000	960,000
Total interest income	38,037,000	42,227,000	44,040,000
INTEREST EXPENSE:
Interest on deposits	8,277,000	10,902,000	13,160,000
Interest on advances from FHLB - short term	39,000	1,056,000	790,000
Interest on advances from FHLB - long term	6,482,000	7,467,000	5,339,000
Total interest expense	14,798,000	19,425,000	19,289,000
NET INTEREST INCOME	23,239,000	22,802,000	24,751,000
PROVISION FOR LOAN LOSSES	200,000	3,025,000	100,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	23,039,000	19,777,000	24,651,000
NON-INTEREST INCOME:
Fees and other service charges	573,000	540,000	661,000
Gain on sale of mortgage-backed securities available for sale	1,644,000	5,993,000	1,057,000
Gain (loss) on equity securities, net	(29,000)	(44,000)	58,000
Gain on sale of loans	110,000	488,000	9,000
Swap income (loss)	384,000	(56,000)	158,000
Earnings from bank owned life insurance	616,000	656,000	645,000
Other	341,000	526,000	506,000
Total non-interest income	3,639,000	8,103,000	3,094,000
NON-INTEREST EXPENSES:
Salaries and employee benefits	10,558,000	9,562,000	8,857,000
Data processing	923,000	857,000	789,000
Professional services	1,634,000	1,698,000	1,460,000
Office occupancy	954,000	856,000	968,000
Depreciation	435,000	484,000	619,000
Director compensation	231,000	246,000	255,000
Federal Deposit Insurance Corporation deposit insurance premiums	860,000	701,000	472,000
Real estate owned expense	10,000	165,000	81,000
Advertising	100,000	186,000	279,000
Core deposit amortization	94,000	108,000	123,000
Other	1,830,000	1,862,000	2,162,000
Total non-interest expenses	17,629,000	16,725,000	16,065,000
INCOME BEFORE INCOME TAXES	9,049,000	11,155,000	11,680,000
INCOME TAXES:
Current	592,000	2,045,000	2,338,000
Deferred (benefit) expense	677,000	(445,000)	(188,000)
Total income tax provision	1,269,000	1,600,000	2,150,000
NET INCOME	$ 7,780,000	$ 9,555,000	$ 9,530,000
BASIC EARNINGS PER SHARE	$ 0.98	$ 1.12	$ 1.09
DILUTED EARNINGS PER SHARE	$ 0.98	$ 1.12	$ 1.07

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 7,780	$ 9,555	$ 9,530
Unrealized holding gain (loss) on available-for-sale securities	(4,035)	9,141	21,871
Tax effect	847	(1,920)	(4,593)
Reclassification adjustment for net securities (gains) losses realized in net income	(1,644)	(5,993)	(1,057)
Tax effect	345	1,259	222
Unrealized holding gain (loss) on interest rate swaps	6,652	(8,382)	(8,952)
Tax effect	(1,397)	1,760	1,880
Total other comprehensive (loss) income	768	(4,135)	9,371
Comprehensive income (loss)	$ 8,548	$ 5,420	$ 18,901

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
BALANCE at Sep. 30, 2018	$ 108	$ 118,345	$ (27,744)	$ 45,854	$ (8,154)	$ 128,409
Increase (Decrease) in Stockholders' Equity
Net income				9,530		9,530
Other comprehensive income (loss)					9,371	9,371
Dividends paid				(5,784)		(5,784)
Purchase of treasury stock			(3,648)			(3,648)
Treasury stock used for employee benefit plans		(1,154)	1,694			540
Stock option expense		573				573
Restricted shares award expense		620				620
Reclassification due to change in federal income tax rate				25	(25)
BALANCE at Sep. 30, 2019	108	118,384	(29,698)	49,625	1,192	139,611
Increase (Decrease) in Stockholders' Equity
Net income				9,555		9,555
Other comprehensive income (loss)					(4,135)	(4,135)
Dividends paid				(6,216)		(6,216)
Purchase of treasury stock			(10,534)			(10,534)
Treasury stock used for employee benefit plans		(811)	1,025			214
Stock option expense		353				353
Restricted shares award expense		344				344
Reclassification for adoption of ASU 2016-01				75		75
BALANCE at Sep. 30, 2020	108	118,270	(39,207)	52,889	(2,943)	129,117
Increase (Decrease) in Stockholders' Equity
Net income				7,780		7,780
Other comprehensive income (loss)					768	768
Dividends paid				(2,219)		(2,219)
Purchase of treasury stock			(5,391)			(5,391)
Treasury stock used for employee benefit plans		(185)	247			62
Stock option expense		169				169
Restricted shares award expense		170				170
BALANCE at Sep. 30, 2021	$ 108	$ 118,424	$ (44,351)	$ 58,450	$ (2,175)	$ 130,456

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Dividends paid (in dollars per share)	$ 0.28	$ 0.71	$ 0.65
Treasury stock used for employee benefit plan	(17,595)	(78,616)	(109,634)
Common Stock
Purchase of treasury stock	(386,883)	(829,388)	(207,543)

CONSOLIDATED STATEMENTS OF CH_3

CONSOLIDATED STATEMENTS OF CHANGES OF CASH FLOW - USD ($)	12 Months Ended
CONSOLIDATED STATEMENTS OF CHANGES OF CASH FLOW - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES:
Net income	$ 7,780,000	$ 9,555,000	$ 9,530,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	435,000	484,000	619,000
Net amortization/accretion of premiums/discounts and other amortization	(780,000)	(1,934,000)	(2,407,000)
Earnings on BOLI	(616,000)	(656,000)	(645,000)
Provision for loan losses	200,000	3,025,000	100,000
Accretion of deferred loan fees and costs	(299,000)	(76,000)	(136,000)
(Gain) loss on sale of real estate owned		(99,000)	46,000
(Gain) loss on sale of investment and mortgage-backed securities	(1,644,000)	(5,993,000)	(1,057,000)
Write-down of real estate owned		125,000	75,000
Gain on sale of loans	(110,000)	(488,000)	(9,000)
Proceeds from the sale of loans	6,500,000	31,774,000	612,000
Originations of loans held for sale	(6,390,000)	(12,192,000)	(603,000)
Share-based compensation expense	339,000	697,000	1,193,000
Holding (gains) losses on equity securities	29,000	45,000	(58,000)
Holding losses (gains) on equity securities	29,000	(44,000)	(58,000)
Deferred income tax benefit	677,000	(445,000)	(188,000)
Changes in assets and liabilities which used cash:
Accrued interest receivable	373,000	(150,000)	(724,000)
Accrued interest payable	(816,000)	(954,000)	1,096,000
Other, net	(628,000)	(430,000)	543,000
Net cash provided by operating activities	5,050,000	22,288,000	7,987,000
INVESTING ACTIVITIES:
Purchase of investment and mortgage-backed securities available for sale	(55,146,000)	(175,710,000)	(280,303,000)
Purchase of investment and mortgage-backed securities held to maturity	(1,737,000)	(2,500,000)	(11,849,000)
Loans originated or acquired	(280,330,000)	(138,272,000)	(100,371,000)
Principal collected on loans	246,802,000	113,170,000	118,404,000
Principal payments received on investment and mortgage-backed securities:
Held-to-maturity	4,439,000	48,216,000	3,002,000
Available-for-sale	138,522,000	138,074,000	24,091,000
Redemption of certificates of deposit	996,000	249,000	(747,000)
Proceeds from sale of investment and mortgage-backed securities	26,059,000	142,055,000	75,639,000
Proceeds from redemption of FHLB stock	3,461,000	10,905,000	5,145,000
Purchase of FHLB stock	(1,020,000)	(7,031,000)	(13,966,000)
Purchase of BOLI			(2,500,000)
Proceeds from sale of other real estate owned		505,000	557,000
Purchases of equipment	(156,000)	(407,000)	(386,000)
Net cash provided by investing activities	81,890,000	129,254,000	(183,284,000)
FINANCING ACTIVITIES:
Net increase (decrease) in demand deposits, NOW accounts, and savings accounts	(34,701,000)	269,078,000	11,816,000
Net (decrease) increase in certificates of deposit	(24,727,000)	(243,573,000)	(50,501,000)
Net (decrease) increase in FHLB short-term advances	(25,000,000)	(65,000,000)	80,000,000
Proceeds from FHLB advances - long term			175,997,000
Repayment of FHLB advances - long term	(28,185,000)	(26,650,000)	(33,575,000)
Increase in advances from borrowers for taxes and insurance	(1,100,000)	466,000	249,000
Cash dividends paid	(2,219,000)	(6,216,000)	(5,784,000)
Purchase of treasury stock	(5,391,000)	(10,534,000)	(3,108,000)
Net cash used in financing activities	(121,323,000)	(82,429,000)	175,094,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	(34,383,000)	69,113,000	(203,000)
CASH AND CASH EQUIVALENTS-Beginning of period	117,081,000	47,968,000	48,171,000
CASH AND CASH EQUIVALENTS-End of period	82,698,000	117,081,000	47,968,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Interest on deposits and advances from Federal Home Loan Bank	15,614,000	20,379,000	18,531,000
Income taxes paid	70,000	3,070,000	$ 2,409,000
SUPPLEMENTAL DISCLOSURES OF NONCASH ITEMS
Loans transferred to other real estate owned	$ 4,109,000	183,000
Lease adoption:
Right of use lease asset		1,415,000
Lease liability		$ 1,536,000

NATURE OF OPERATIONS AND BASIS

NATURE OF OPERATIONS AND BASIS OF PRESENTATION	12 Months Ended
NATURE OF OPERATIONS AND BASIS OF PRESENTATION	Sep. 30, 2021
NATURE OF OPERATIONS AND BASIS OF PRESENTATION
NATURE OF OPERATIONS AND BASIS OF PRESENTATION	1. NATURE OF OPERATIONS AND BASIS OF PRESENTATION Prudential Bancorp, Inc. (the “Company”) is a Pennsylvania corporation that was incorporated in June 2013 to be the successor corporation of Prudential Bancorp, Inc. of Pennsylvania (“Old Prudential Bancorp”), the former stock holding company for Prudential Bank (the “Bank”), a Pennsylvania-chartered, FDIC-insured savings bank with ten full service branches in the Philadelphia area. The Bank’s primary federal banking regulator is the Federal Deposit Insurance Corporation (the “FDIC”). The Bank is also regulated by the Pennsylvania Department of Banking and Securities ( the “Department”). The Bank is principally in the business of attracting deposits from its community through its branch offices and investing those deposits, together with funds from borrowings, primarily in loans and investments. The Bank’s sole subsidiary as of September 30, 2021 was PSB Delaware, Inc. (“PSB”), a Delaware-chartered corporation established to hold certain investments. As of September 30, 2021, PSB had total assets of $275.5 million primarily consisting of investment and mortgage-backed securities. Most of the Company’s business activities are conducted within a few hours’ drive from Philadelphia and include eastern Pennsylvania, Delaware, New Jersey and southern New York.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidation – . Use of Estimates in the Preparation of Financial Statements — Cash and Cash Equivalents — Certificates of Deposit— one Investment Securities and Mortgage-Backed Securities — Held to Maturity Available for Sale are reported net of tax as a separate component of stockholders’ equity until realized. Realized gains or losses on the sale of investment and mortgage-backed securities are reported in earnings as of the trade date and determined using the adjusted cost of the specific security sold. Premiums are amortized and discounts are accreted using the interest method over the estimated remaining term of the underlying security. Equity Securities Other-than-temporary impairment Loans Receivable — Loan Origination and Commitment Fees — Interest on Loans — Allowance for Loan Losses— Impaired loans are loans for which it is not probable to collect all amounts due according to the contractual terms of the loan agreements. Management individually evaluates such loans for impairment and does not aggregate loans by major risk classifications. Factors considered by management in determining impairment include payment status and collateral value. The amount of impairment for impaired loans is determined by the difference between the present value of the expected cash flows related to the loans, using the original interest rate, and their recorded value, or as a practical expedient in the case of collateralized loans, the difference between the fair value of the collateral and the recorded amount of the loans. When foreclosure is probable, impairment is measured based on the then fair value of the collateral. Mortgage loans and consumer loans are comprised of large groups of smaller balance homogeneous loans which are evaluated for impairment collectively. Loans that experience insignificant payment delays, which are defined as delays of less than 90 days, generally are not classified as impaired. Management determines the significance of payment delays 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 borrower’s prior payment record, and the amount of shortfall in relation to the principal and interest owed. Real Estate Owned — Restricted Bank Stock – The Bank is a member of the FHLB of Pittsburgh and as such, is required to maintain a minimum investment in stock of the FHLB that varies with the level of advances outstanding with the FHLB. The stock is bought from and sold to the FHLB based upon its $100 par value. The stock does not have a readily determinable fair value and as such is classified as restricted stock, carried at cost and evaluated for impairment by management. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) the significance of the decline in net assets of the FHLB as compared to the capital stock amount and the length of time this situation has persisted; (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance; (c) the impact of legislative and regulatory changes on the customer base of the FHLB; and (d) the liquidity position of the FHLB. The FHLB of Pittsburgh continues to report net income, continues to declare quarterly cash dividends and had its Aaa bond rating affirmed by Moody’s and its AA+ rating affirmed by Standard and Poor’s, which ratings during 2021 remained unchanged as of September 30, 2021. With consideration given to these factors, management concluded that the stock was not impaired at September 30, 2021 or 2020. In 2018, the Bank purchased $90,000 of stock in ACBB to support a $12.5 million line of credit. The line has not been drawn on. Office Properties and Equipment — Cash Surrender Value of Life Insurance— Dividend Payable Goodwill Share-Based Compensation Treasury Stock – Comprehensive Income Income Taxes— In evaluating the Company’s ability to recover deferred tax assets, management considers all available positive and negative evidence, including past operating results and forecast of future taxable income. In determining future taxable income, management makes assumptions for the amount of taxable income, the reversal of temporary differences and the implementation of feasible and prudent tax planning strategies. These assumptions require management to make judgments about future taxable income and are consistent with the plans and estimates the Company uses to manage the business. Any reduction in estimated future taxable income may require management to record an additional valuation allowance against the deferred tax assets. An increase in the valuation allowance would result in additional income tax expense in the period and could have a significant impact on our future earnings. Transfers and Servicing of Financial Assets and Extinguishments of Liabilities — Interest Rate Swap Agreement - For the fair value hedges, changes in the fair value of the interest rate swap are expected to be “perfectly effective” in offsetting changes in the fair value of the hedged item, thus no portion of the change in market value is anticipated to be recognized in earnings. For cash flow hedges, the net settlement (upon close-out or termination) that offsets changes in the value of the hedged debt is deferred and amortized into net interest income over the life of the hedged debt. For fair value hedges, the net settlement (upon close-out or termination) that offsets changes in the value of the loans adjusts the basis of the loans and is deferred and amortized to loan interest income over the life of the loans. The portion, if any, of the net settlement amount that did not offset changes in the value of the hedged asset or liability is recognized immediately in non-interest income. Interest rate derivative financial instruments receive hedge accounting treatment only if they are designated as a hedge and are expected to be, and are, effective in substantially reducing interest rate risk arising from the assets and liabilities identified as exposing the Company to risk. Those derivative financial instruments that do not meet specified hedging criteria would be recorded at fair value, with changes in fair value recorded in income. If periodic assessment indicates derivatives no longer provide an effective hedge, the derivative contracts would be closed out and settled, or classified as a trading activity. Loans Acquired For purchased loans acquired that are not deemed impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Loans are aggregated and accounted for as a pool of loans if the loans being aggregated have common risk characteristics. Subsequent to the purchase date, the methods utilized to estimate the required allowance for credit losses for these loans is similar to originated loans; however, the Company records a provision for loan losses only when the required allowance exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loans. Revenue Recognition - Service charges on deposit accounts consist of account analysis fees (i.e. net fees earned on analyzed business and public checking accounts), monthly service fees, check orders, and other deposit account related fees. The Company’s performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees are largely transactional based, and therefore, the Company’s performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Fees, interchange, and other service charges are primarily comprised of debit card income, ATM fees, cash management income, and other services charges. Debit card income is primarily comprised of interchange fees earned whenever the Company’s debit cards are processed through card payment networks such as Mastercard. ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a company ATM. Other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for fees, exchange, and other service charges are largely satisfied, and related revenue recognized when the services are rendered or upon completion. Payment is typically received immediately or in the following month. Reclassification of Comparative Amounts - Recently Adopted Accounting Pronouncements In August 2021, the FASB issued ASU 2021-06, Presentation of Financial Statements (Topic 205), Financial Services – Depository and Lending (Topic 942), and Financial Services – Investment Companies (Topic 946): Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases No. 33-10786, Amendments to Financial Disclosures about Acquired and Disposed Businesses, and No. 33-10835, Update of Statistical Disclosures for Bank and Savings and Loan Registrants (SEC Update) Amendments to Financial Disclosures about Acquired and Disposed Businesses Update of Statistical Disclosures for Bank and Savings and Loan Registrants In January 2020, the FASB issued ASU 2020-4, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, March 2020 In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848) hedging relationships evaluated for effectiveness for periods after December 31, 2022, except for certain hedging relationships existing as of December 31, 2022, that apply certain optional expedients in which the accounting effects are recorded through the end of the hedging relationship. The update has not had a significant impact on the Company’s financial position and/or results of operations. Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments In May 2019, the FASB issued ASU 2019-05, Financial Instruments – Credit Losses, Topic 326 In November 2019, the FASB issued ASU 2019-10, Financial Instruments Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) Intangibles ‒ Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (Goodwill) In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt – Modifications and Extinguishments (Subtopic 470-50), Compensation – Stock Compensation (Topic 718), and Derivatives and Hedging – Contracts in Entity’s Own Equity (Subtopic 815-40), entities, including adoption in an interim period. If an entity elects to early adopt the amendments in this Update in an interim period, the guidance should be applied as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
EARNINGS PER SHARE	Sep. 30, 2021
EARNINGS PER SHARE
EARNINGS PER SHARE	3. EARNINGS PER SHARE Basic earnings per share is computed based on the weighted average number of common shares outstanding. Diluted earnings per share is computed based on the weighted average number of common shares outstanding and common share equivalents (“CSEs”) that would arise from the exercise of dilutive shares. The calculated basic and diluted earnings per share are as follows: Year Ended September 30, 2021 2020 2019 (Dollars in Thousands Except Per Share Data) Basic Diluted Basic Diluted Basic Diluted Net income $ 7,780 $ 7,780 $ 9,555 $ 9,555 $ 9,530 $ 9,530 Weighted average common shares outstanding 7,935,143 7,935,143 8,538,006 8,538,006 8,777,794 8,777,794 Effect of CSEs — 17,794 — 24,470 — 158,083 Adjusted weighted average common shares used in earnings per share computation 7,935,143 7,952,937 8,538,006 8,562,476 8,777,794 8,935,877 Earnings per share $ 0.98 $ 0.98 $ 1.12 $ 1.12 $ 1.09 $ 1.07 As of September 30, 2021, 2020, and 2019, there were 267,728, 282,728 and 550,833 shares, respectively, of common stock subject to options with an exercise price less than the then current market value, as of such dates and which were included in the computation of diluted earnings per share. At September 30, 2021, 2020 and 2019, there were 253,530, 288,530 and 242,201 shares, respectively, that had exercise prices greater than the average market value during the period and are considered anti-dilutive and not included in diluted earnings per share.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	12 Months Ended
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	Sep. 30, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	4. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table presents the changes in accumulated other comprehensive (loss) income by component net of tax: Year Ended September 30, 2021 2021 2021 2020 2020 2020 (Dollars in Thousands) Total Total accumulated accumulated Unrealized gain Unrealized gain (loss) other Unrealized gain Unrealized loss other (loss) on AFS on interest rate swaps comprehensive (loss) on AFS on interest rate comprehensive securities (a) (a) income (loss) securities (a) swaps (a) income (loss) Beginning Balance, October 1 $ 10,585 $ (13,528) $ (2,943) $ 8,098 $ (6,906) $ 1,192 Other comprehensive (loss) income before reclassification (3,188) 5,255 2,067 7,221 (6,622) 599 Amount reclassified from accumulated other comprehensive income (1,299) — (1,299) (4,734) — (4,734) Ending Balance, September 30 $ 6,098 $ (8,273) $ (2,175) $ 10,585 $ (13,528) $ (2,943) Year Ended September 30, 2019 2019 2019 (Dollars in Thousands) Total accumulated Unrealized gain Unrealized gain (loss) other (loss) on AFS on interest rate swaps comprehensive securities (a) (a) income (loss) Beginning Balance, October 1 $ (8,320) $ 166 $ (8,154) Other comprehensive (loss) income before reclassification 17,278 (7,072) 10,206 Amount reclassified from accumulated other comprehensive income (835) — (835) Reclassification for net gains recorded in net income (25) — (25) Ending Balance, September 30 $ 8,098 $ (6,906) $ 1,192 (a) All amounts are net of tax. Amounts in parentheses indicate debits. The following table presents significant amounts reclassified out of each component of accumulated other comprehensive (loss) income for the years ended September 30, 2021, 2020 and 2019. Year Ended September 30, 2021 2021 2021 2020 2020 2020 (Dollars in Thousands) Securities Swaps Total Securities Swaps Total Unrealized gain $ 1,644 (1) $ — $ 1,644 $ 5,993 (1) $ — $ 5,993 Income taxes (345) (2) — (345) (1,259) (2) — (1,259) $ 1,299 $ — $ 1,299 $ 4,734 $ — $ 4,734 Year Ended September 30, 2019 2019 2019 (Dollars in Thousands) Securities Swaps Total Unrealized gain $ 1,057 (1) $ — $ 1,057 Income taxes (222) (2) — (222) $ 835 $ — $ 835 (1) Recorded as a gain on the sale of investment and mortgage-backed securities available for sale. (2) Recorded as income tax expense

INVESTMENT AND MORTGAGE-BACKED

INVESTMENT AND MORTGAGE-BACKED SECURITIES	12 Months Ended
INVESTMENT AND MORTGAGE-BACKED SECURITIES	Sep. 30, 2021
INVESTMENT AND MORTGAGE-BACKED SECURITIES
INVESTMENT AND MORTGAGE-BACKED SECURITIES	5. INVESTMENT AND MORTGAGE-BACKED SECURITIES The amortized cost and fair value of securities, with gross unrealized gains and losses, are as follows: September 30, 2021 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in Thousands) Securities Available for Sale: U.S. government and agency obligations $ 3,117 $ 77 $ — $ 3,194 State and political subdivisions 70,625 1,793 (159) 72,259 Mortgage-backed securities - U.S. government agencies 131,842 4,267 (756) 135,353 Corporate debt securities 92,645 2,683 (187) 95,141 Total debt securities available for sale $ 298,229 $ 8,820 $ (1,102) $ 305,947 Securities Held to Maturity: U.S. government and agency obligations $ 1,000 $ 173 $ — $ 1,173 State and political subdivisions 14,983 727 — 15,710 Mortgage-backed securities - U.S. government agencies 4,091 211 (24) 4,278 Total securities held to maturity $ 20,074 $ 1,111 $ (24) $ 21,161 September 30, 2020 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in Thousands) Securities Available for Sale: U.S. government and agency obligations $ 22,241 $ 153 $ — $ 22,394 State and political subdivisions 79,099 1,940 (1,418) 79,621 Mortgage-backed securities - U.S. government agencies 226,863 9,774 (71) 236,566 Corporate debt securities 78,764 3,564 (545) 81,783 Total debt securities available for sale $ 406,967 $ 15,431 $ (2,034) $ 420,364 Securities Held to Maturity: U.S. government and agency obligations $ 1,000 $ 236 $ — $ 1,236 State and political subdivisions 18,076 925 — 19,001 Mortgage-backed securities - U.S. government agencies 3,784 309 — 4,093 Total securities held to maturity $ 22,860 $ 1,470 $ — $ 24,330 As of September 30, 2021, the Bank maintained securities with a fair value of $106.8 million in a safekeeping account at the FHLB of Pittsburgh used for collateral and convenience. The Bank is only required to hold $94.2 million as specific collateral for its borrowings; therefore the $12.6 million in excess securities are not restricted and could be sold or transferred if needed. The following table shows the gross unrealized losses and related fair values of the Company’s available for sale investment securities, aggregated by investment category and the length of time that individual securities had been in a continuous loss position at September 30, 2021: Less than 12 months More than 12 months Total Gross Gross Gross Unrealized Fair Unrealized Fair Unrealized Fair Losses Value Losses Value Losses Value (Dollars in Thousands) Securities Available for Sale: State and political subdivisions $ (93) $ 14,383 $ (66) $ 4,417 $ (159) $ 18,800 Mortgage-backed securities -U.S. government agencies (487) 18,493 (269) 7,849 (756) 26,342 Corporate debt securities (187) 24,816 — — (187) 24,816 Total securities available for sale $ (767) $ 57,692 $ (335) $ 12,266 $ (1,102) $ 69,958 Securities Held to Maturity: Mortgage-backed securities -U.S. government agencies $ (24) $ 1,269 $ — $ — $ (24) $ 1,269 Total securities held to maturity $ (24) $ 1,269 $ — $ — $ (24) $ 1,269 Total $ (791) $ 58,961 $ (335) $ 12,266 $ (1,126) $ 71,227 Management evaluates securities for other-than-temporary impairment (“OTTI”) at least once per quarter, and more frequently when economic or market conditions warrant such evaluation. The evaluation is based upon factors such as the creditworthiness of the issuers/guarantors, the underlying collateral, if applicable, and the continuing performance of the securities. Management also evaluates other facts and circumstances that may be indicative of an OTTI condition. This includes, but is not limited to, an evaluation of the type of security, the length of time and extent to which the fair value of the security has been less than cost, and the near-term prospects of the issuer. The Company assesses the credit loss by considering whether (1) the Company has the intent to sell the security, (2) it is more likely than not that it will be required to sell the security before recovery, or (3) it does not expect to recover the entire amortized cost basis of the security. The Company bifurcates the OTTI impact on impaired securities where impairment in value was deemed to be other than temporary between the component representing credit loss and the component representing loss related to other factors. The portion of the fair value decline attributable to credit loss must be recognized through a charge to earnings. The credit component is determined by comparing the present value of the cash flows expected to be collected, discounted at the rate in effect before recognizing any OTTI with the amortized cost basis of the debt security. The Company uses the cash flow expected to be realized from the security, which includes assumptions about interest rates, timing and severity of defaults, estimates of potential recoveries, the cash flow distribution from the bond indenture and other factors, then applies a discount rate equal to the effective yield of the security. The difference between the present value of the expected cash flows and the amortized book value is considered a credit loss. The fair value of the security is determined using the same expected cash flows; the discount rate is a rate the Company determines from the open market and other sources as appropriate for the security. The difference between the fair value and the security’s remaining amortized cost is recognized in other comprehensive income (loss). For the years ended September 30, 2021, 2020 and 2019, the Company determined that no OTTI had occurred within the investment and mortgage-backed securities portfolios. U.S. Government and agency obligations– Mortgage-backed securities – U.S. government agencies — Corporate debt securities — State and political subdivision debt securities — the Company anticipates it will recover the entire amortized cost basis of the securities. As a result, the Company did not consider these investments to be other-than-temporarily impaired at September 30, 2021. The following table shows the gross unrealized losses and related fair values of the investment securities, aggregated by investment category and length of time that individual securities have been in a continuous loss position at September 30, 2020: Less than 12 months More than 12 months Total Gross Gross Gross Unrealized Fair Unrealized Fair Unrealized Fair Losses Value Losses Value Losses Value (Dollars in Thousands) Securities Available for Sale: State and political subdivisions $ (126) $ 10,735 $ (1,292) $ 24,510 $ (1,418) $ 35,245 Mortgage-backed securities - US government agencies (66) 10,025 (5) 584 (71) 10,609 Corporate debt securities (545) 16,472 — — (545) 16,472 Total securities available for sale $ (737) $ 37,232 $ (1,297) $ 25,094 $ (2,034) $ 62,326 The amortized cost and fair value of debt securities by contractual maturity are shown below. Expected maturities as of September 30, 2021 will differ from contractual maturities because of call provisions in the securities. Mortgage-backed securities were not included as the contractual maturity is generally irrelevant due to the borrowers’ right to prepay without pre-payment penalty which results in significant prepayments. September 30, 2021 Held to Maturity Available for Sale Amortized Fair Amortized Fair Cost Value Cost Value (Dollars in Thousands) Due within one year $ 1,035 $ 1,049 $ — $ — Due after one through five years 4,444 4,792 40,137 41,330 Due after five through ten years 6,465 6,730 54,223 55,628 Due after ten years 4,039 4,312 72,027 73,636 Total $ 15,983 $ 16,883 $ 166,387 $ 170,594 During the fiscal years ended September 30, 2021, 2020 and 2019, the Company recorded realized gross gains of $1.6 million, $6.1 million and $1.3 million, respectively. The Company recorded gross losses of $-0-, $68,000 and $280,000, respectively, for the same periods. Gross proceeds from the sale of investment and mortgage-backed securities totaled $26.1 million, $142.1 million and $75.6 million, for the respective fiscal years.

LOANS RECEIVABLE

LOANS RECEIVABLE	12 Months Ended
LOANS RECEIVABLE	Sep. 30, 2021
LOANS RECEIVABLE
LOANS RECEIVABLE	6. LOANS RECEIVABLE Loans receivable consist of the following: September 30, September 30, 2021 2020 (Dollars in Thousands) One-to-four family residential $ 202,330 $ 233,872 Multi-family residential 76,122 31,100 Commercial real estate 165,992 139,943 Construction and land development 205,413 260,648 Loans to financial institutions — 6,000 Commercial business 57,236 12,916 Leases — 176 Consumer 530 604 Total loans 707,623 685,259 Undisbursed portion of loans-in-process (80,620) (86,862) Deferred loan fees (280) (1,794) Allowance for loan losses (8,517) (8,303) Net loans $ 618,206 $ 588,300 The Company originates loans to customers located primarily in its market area of eastern Pennsylvania, Delaware, New Jersey and southern New York. The ultimate repayment of these loans at September 30, 2021 is dependent, to a certain degree, on the state of the economy and real estate market in these areas. The following table summarizes the loans individually and collectively evaluated for impairment by loan segment at September 30, 2021: One to four Multi-family Commercial Construction and Commercial family residential residential real estate land development business Consumer Unallocated Total (Dollars in Thousands) Allowance for loan losses: Individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 1,665 1,051 2,220 1,968 799 15 799 8,517 Total ending allowance balance $ 1,665 $ 1,051 $ 2,220 $ 1,968 $ 799 $ 15 $ 799 $ 8,517 Loans: Individually evaluated for impairment $ 3,006 $ — $ 1,280 $ 4,093 $ — $ — $ 8,379 Collectively evaluated for impairment 199,324 76,122 164,712 201,320 57,236 530 699,244 Total loans $ 202,330 $ 76,122 $ 165,992 $ 205,413 $ 57,236 $ 530 $ 707,623 The following table summarizes the loans individually and collectively evaluated for impairment by loan segment at September 30, 2020: One to Loans to four Multi-family Commercial Construction and Commercial financial family residential residential real estate land development business institutions Leases Consumer Unallocated Total (Dollars in Thousands) Allowance for loan losses: Individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 1,877 460 1,989 2,888 194 89 3 6 797 8,303 Total ending allowance balance $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 Loans: Individually evaluated for impairment $ 3,095 $ — $ 1,417 $ 8,525 $ — $ — $ — $ — $ 13,037 Collectively evaluated for impairment 230,777 31,100 138,526 252,123 12,916 6,000 176 604 672,222 Total loans $ 233,872 $ 31,100 $ 139,943 $ 260,648 $ 12,916 $ 6,000 $ 176 $ 604 $ 685,259 The loan portfolio is segmented at a level that allows management to monitor risk and performance. Management evaluates all loans classified as substandard or lower and loans delinquent 90 or more days for potential impairment. Loans are considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Once the determination is made that a loan is impaired, the determination of whether a specific allocation of the allowance, or charge off, is necessary is generally measured by comparing the recorded investment in the loan to the fair value of the loan using one of the following three methods: (a) the present value of the expected future cash flows discounted at the loan’s effective interest rate; (b) the loan’s observable market price; or (c) the fair value of the collateral less selling costs. Management primarily utilizes the fair value of collateral method as a practically expedient alternative. The following table presents impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary as of September 30, 2021: Impaired Loans with Impaired Loans with No Specific Specific Allowance Allowance Total Impaired Loans (Dollars in Thousands) Unpaid Recorded Related Recorded Recorded Principal Investment Allowance Investment Investment Balance One-to-four family residential $ — $ — $ 3,006 $ 3,006 $ 3,304 Commercial real estate — — 1,280 1,280 1,457 Construction and land development — — 4,093 4,093 4,340 Total $ — $ — $ 8,379 $ 8,379 $ 9,101 The following table presents impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary as of September 30, 2020: Impaired Loans with Impaired Loans with No Specific Specific Allowance Allowance Total Impaired Loans (Dollars in Thousands) Unpaid Recorded Related Recorded Recorded Principal Investment Allowance Investment Investment Balance One-to-four family residential $ — $ — $ 3,095 $ 3,095 $ 3,482 Commercial real estate — — 1,417 1,417 1,600 Construction and land development — — 8,525 8,525 10,906 Total $ — $ — $ 13,037 $ 13,037 $ 15,988 The following tables present the average investment in impaired loans and related interest income recognized for the periods indicated: Year Ended September 30, 2021 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 3,212 $ 18 $ 13 Commercial real estate 1,336 — — Construction and land development 6,697 — — Total impaired loans $ 11,245 $ 18 $ 13 Year Ended September 30, 2020 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 3,825 $ 13 $ 26 Multi-family residential 56 — — Commercial real estate 1,549 — 1 Construction and land development 8,685 — — Commercial business 2 — — Consumer 24 — — Total impaired loans $ 14,141 $ 13 $ 27 Year Ended September 30, 2019 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 4,685 $ 77 $ 22 Multi-family residential 145 10 — Commercial real estate 2,139 36 4 Construction and land development 8,751 — — Total $ 15,720 $ 123 $ 26 Federal banking regulations and our policies require that the Bank utilize an internal asset classification system as a means of reporting problem and potential problem assets. The Bank has incorporated an internal asset classification system, consistent with Federal banking regulations, as a part of the credit monitoring system. Management currently classifies problem and potential problem assets as “special mention,” “substandard,” “doubtful” or “loss” assets. An asset is considered “substandard” if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. “Substandard” assets include those characterized by the “distinct possibility” that the insured institution will sustain “some loss” if the deficiencies are not corrected. Assets classified as “doubtful” have all of the weaknesses inherent in those classified “substandard” with the added characteristic that the weaknesses present make “collection or liquidation in full,” on the basis of currently existing facts, conditions, and values, “highly questionable and improbable.” Assets classified as “loss” are those considered “uncollectible” and of such little value that their continuance as assets without the establishment of a specific loss reserve is not warranted. Assets which do not currently expose the insured institution to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses are required to be designated “special mention.” The following tables present the classes of the loan portfolio in which a formal risk weighting system is utilized summarized by the aggregate “Pass” and the criticized category of “special mention”, and the classified categories of “substandard” and “doubtful” within the Bank’s risk rating system. The Bank had no loans classified as “doubtful” or “loss” at either of the dates presented. September 30, 2021 Special Pass Mention Substandard Doubtful Total (Dollars in Thousands) One-to-four residential $ 197,920 $ 1,404 $ 3,006 $ — $ 202,330 Multi-family residential 71,497 4,625 — — 76,122 Commercial real estate 162,657 2,055 1,280 — 165,992 Construction and land development 201,320 — 4,093 — 205,413 Loans to financial institutions — — — — — Commercial business 57,236 — — — 57,236 Total $ 690,630 $ 8,084 $ 8,379 $ — $ 707,093 September 30, 2020 Special Pass Mention Substandard Doubtful Total (Dollars in Thousands) One-to-four residential $ 229,361 $ 1,416 $ 3,095 $ — $ 233,872 Multi-family residential 31,100 — — — 31,100 Commercial real estate 128,527 9,999 1,417 — 139,943 Construction and land development 252,123 — 8,525 — 260,648 Loans to financial institutions 6,000 — — — 6,000 Commercial business 12,916 — — — 12,916 Total $ 660,027 $ 11,415 $ 13,037 $ — $ 684,479 The following tables present loans in which a formal risk rating system is not utilized, but loans are segregated between performing and non-performing based primarily on delinquency status: September 30, 2021 Non- Performing Performing Total (Dollars in Thousands) Consumer $ 530 $ — $ 530 September 30, 2020 Non- Performing Performing Total (Dollars in Thousands) Leases $ 176 $ — $ 176 Consumer 604 — 604 Total $ 780 $ — $ 780 Management further monitors the performance and credit quality of the loan portfolio by analyzing the age of the portfolio as determined by the length of time a recorded payment is due. The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and non-accrual loans: September 30, 2021 90 Days+ 30 ‑ 89 Days 90 Days + Total Total Non- Past Due Current Past Due Past Due Past Due Loans Accrual and Accruing (Dollars in Thousands) One-to-four family residential $ 199,799 $ 487 $ 2,044 $ 2,531 $ 202,330 $ 3,006 $ — Multi-family residential 76,122 — — — 76,122 — — Commercial real estate 164,712 — 1,280 1,280 165,992 1,280 — Construction and land development 201,320 — 4,093 4,093 205,413 4,093 — Commercial business 57,236 — — — 57,236 — — Consumer 493 37 — 37 530 — — Total Loans $ 699,682 $ 524 $ 7,417 $ 7,941 $ 707,623 $ 8,379 $ — September 30, 2020 90 Days+ 30 ‑ 89 Days 90 Days + Total Total Non- Past Due Current Past Due Past Due Past Due Loans Accrual and Accruing (Dollars in Thousands) One-to-four family residential $ 231,196 $ 523 $ 2,153 $ 2,676 $ 233,872 $ 3,095 $ — Multi-family residential 31,100 — — — 31,100 — — Commercial real estate 136,225 2,301 1,417 3,718 139,943 1,417 — Construction and land development 252,123 — 8,525 8,525 260,648 8,525 — Commercial business 12,916 — — — 12,916 — — Loans to financial institutions 6,000 — — — 6,000 — — Leases 176 — — — 176 — Consumer 604 — — — 604 — — Total Loans $ 670,340 $ 2,824 $ 12,095 $ 14,919 $ 685,259 $ 13,037 $ — Interest income on non-accrual loans would have increased by approximately $513,000, $748,000, and $786,000, during fiscal years ended September 30, 2021, 2020, and 2019, respectively, if these loans had performed in accordance with their original terms. The allowance for loan losses is established through a provision for loan losses charged to expense. Management maintains the allowance at a level believed to cover all known and inherent losses in the portfolio that are both probable and reasonable to estimate at each reporting date. Management reviews the allowance for loan losses no less than quarterly in order to identify those inherent losses and to assess the overall collection probability for the loan portfolio in view of these inherent losses. For each primary type of loan, a loss factor is established reflecting an estimate of the known and inherent losses in such loan type using both a quantitative analysis as well as consideration of qualitative factors. The evaluation process includes, among other things, an analysis of delinquency trends, nonperforming loan trends, the level of charge-offs and recoveries, prior loss experience, total loans outstanding, the volume of loan originations, the type, size and geographic concentration of our loans, the value of collateral securing the loans, the borrowers’ ability to repay and repayment performance, the number of loans requiring heightened management oversight, local economic conditions and industry experience. Commercial real estate loans entail significant additional credit risks compared to one-to-four family residential mortgage loans, as they generally involve large loan balances concentrated with single borrowers or groups of related borrowers. In addition, the payment experience on loans secured by income-producing properties typically depends on the successful operation of the related real estate project and/or business of the borrower who is also the primary occupant, and thus may be subject to a greater extent to the effects of adverse conditions in the real estate market and in the economy in general. Commercial business loans typically involve a higher risk of default than residential loans of like duration since their repayment is generally dependent on the successful operation of the borrower’s business and the sufficiency of collateral, if any. Land acquisition, development and construction lending exposes us to greater credit risk than permanent mortgage financing. The repayment of land acquisition, development and construction loans depends upon the sale of the property to third parties or the availability of permanent financing upon completion of all improvements. These events may adversely affect the borrower and the value of the collateral property. The following tables summarize the primary segments of the allowance for loan losses, segmented into the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of September 30, 2021, 2020 and 2019. Activity in the allowance is presented for the years ended September 30, 2021, 2020 and 2019: Year Ended September 30, 2021 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2020 $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 Charge-offs — — — (40) — — — — — (40) Recoveries 5 — — — 14 — — 35 — 54 Provision (217) 591 231 (880) 591 (89) (3) (26) 2 200 ALLL balance at September 30, 2021 $ 1,665 $ 1,051 $ 2,220 $ 1,968 $ 799 $ — $ — $ 15 $ 799 $ 8,517 Year Ended September 30, 2020 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2019 $ 1,002 $ 315 $ 1,257 $ 2,034 $ 206 $ 63 $ 5 $ 13 $ 498 $ 5,393 Charge-offs (3) — — — (15) — — (126) — (144) Recoveries 14 — — — — — 9 6 — 29 Provision 864 145 732 854 3 26 (11) 113 299 3,025 ALLL balance at September 30, 2020 $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 September 30, 2019 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2018 $ 1,325 $ 347 $ 1,154 $ 1,554 $ 187 $ 64 $ 18 $ 17 $ 501 $ 5,167 Charge-offs (7) — — — — — (31) — — (38) Recoveries 164 — — — — — — — — 164 Provision (480) (32) 103 480 19 (1) 18 (4) (3) 100 ALLL balance at September 30, 2019 $ 1,002 $ 315 $ 1,257 $ 2,034 $ 206 $ 63 $ 5 $ 13 $ 498 $ 5,393 The provision credit for the fiscal year ended September 30, 2021 applicable to one to four family residential loans and construction and land development loans was commensurate with the decrease in the applicable portfolio. The increase in provision expense for fiscal year ended September 30, 2020 was primarily applicable to the uncertainties surrounding the COVID-19 pandemic. The increase in provision expense for fiscal year ended September 30, 2019 applicable to the increase in construction and land development was due to the increase in the portfolio, while the provision credit for the one to four family residential loans decreased due to the decrease in the portfolio. Loans acquired in the merger with Polonia Bancorp were recorded at fair value with no carryover of the related allowance for loan losses. Management measured loan fair values based on loan file reviews, appraised collateral values, expected cash flows, and historical loss factors of Polonia Bank. The fair value of the loans acquired was $160.8 million net of a $4.6 million discount of which $2.1 million of the discount remained as of September 30, 2021. The discount is accreted to interest income over the remaining contractual life of the loans acquired. All loans that had a loan-to-value ratio of greater than 80% were determined to have sufficient collateral to recover the carrying amount. Thus, none of the loans acquired were considered to be purchased credit-impaired loans and any possible loss would be considered immaterial. Management established a provision for loan losses of $200,000, $3.0 million and $100,000 for the years ended September 30, 2021, 2020 and 2019, respectively. The provision for loan losses was deemed necessary for fiscal 2021 primarily to maintain the allowance at a level sufficient to cover all inherent and probable losses in the current portfolio. Minimal delinquencies have occurred as of September 30, 2021 due to the effects of the COVID-19 pandemic. There were no loan deferments outstanding as of September 30, 2021 and all previously existing COVID-19 deferrals had ended by September 30, 2020. Two participation interests in commercial real estate loans aggregating $10.0 million, or 1.5% of total loans, each entered into a subsequent deferral period during October 2020 and returned to normal payment status upon expiration of the deferral period. These deferments were not considered to be TDRs as of September 30, 2020 as all applicable borrowers were current as of December 31, 2019 and the request for the deferments were related to the current economic conditions caused by the COVID-19 pandemic, and not by underlying weaknesses within the respective loans. The Company believes that the allowance for loan losses at September 30, 2021 was sufficient to cover all inherent and probable losses associated with the loan portfolio at such date. At September 30, 2021, the Company’s non-performing assets totaled $12.5 million or 1.1% of total assets as compared to $13.0 million or 1.1% of total assets at September 30, 2020. Non-performing assets at September 30, 2021 included three construction loans aggregating $4.1 million, 18 one-to-four family residential loans aggregating $3.0 million, two commercial real estate loans aggregating $1.3 million and two construction loans aggregating $4.1 million that were foreclosed during the third quarter of fiscal 2021 and are held as other real estate owned. At September 30, 2021, the Company had two loans totaling $1.1 million that were classified as troubled debt restructurings (“TDRs”). One TDR is on non-accrual and consists of a $390,000 loan secured by a single-family residential property and is performing in accordance with the restructured terms. The remaining TDR is a $705,000 commercial real estate loan classified as non-accrual and is part of a lending relationship totaling $6.0 million (after taking into account the previously disclosed $1.9 million write-down recognized during the quarter ending March 31, 2017 related to this borrowing relationship and the two construction loans noted above that became other real estate owned during fiscal 2021). There were no TDRs approved in 2021, 2020 or 2019. All of the existing TDRs involved changes in the interest rates on the loans; no debt was forgiven. At September 30, 2021, both of the two then-existing TDR loans were classified as non-performing. At September 30, 2021, the Company had five one-to-four family residential loans with a carrying amount of $613,000 that are secured by residential real estate property for which foreclosure proceedings are in process according to local jurisdictions.

OFFICE PROPERTIES AND EQUIPMENT

OFFICE PROPERTIES AND EQUIPMENT	12 Months Ended
OFFICE PROPERTIES AND EQUIPMENT	Sep. 30, 2021
OFFICE PROPERTIES AND EQUIPMENT
OFFICE PROPERTIES AND EQUIPMENT	7. Office properties and equipment are summarized by major classifications as follows: September 30, 2021 2020 (Dollars in Thousands) Land $ 1,437 $ 1,437 Buildings and improvements 7,449 7,449 Furniture and equipment 4,202 4,046 Total 13,088 12,932 Accumulated depreciation (6,238) (5,803) Total office properties and equipment, net of accumulated depreciation $ 6,850 $ 7,129 For the years ended September 30, 2021, 2020 and 2019, depreciation expense amounted to $435,000, $484,000 and $619,000, respectively. .

DEPOSITS

DEPOSITS	12 Months Ended
DEPOSITS	Sep. 30, 2021
DEPOSITS [Abstract]
DEPOSITS	8. DEPOSITS Deposits consist of the following major classifications: September 30, September 30, 2021 2020 Amount Percent Amount Percent (Dollars in Thousands) Non-interest-bearing checking accounts $ 37,409 5.3 % $ 30,002 3.9 % Interest-bearing checking accounts 87,752 12.3 135,797 17.6 Money market deposit accounts 111,488 15.7 111,105 14.4 Passbook, club and statement savings 229,989 32.3 224,435 29.1 Certificates maturing in six months or less 143,767 20.2 125,165 16.2 Certificates maturing in more than six months 101,110 14.2 144,445 18.8 Total $ 711,515 100.0 % $ 770,949 100.0 % The amount of scheduled maturities of certificate accounts was as follows: September 30, 2021 (Dollars in Thousands) One year or less $ 182,719 One through two years 33,547 Two through three years 19,700 Three through four years 6,073 Four through five years 2,838 Total $ 244,877 Certificates of deposit of $250,000 or more at September 30, 2021 and 2020 totaled $95.3 million and $76.6 million, respectively. Included in certificates of deposit at September 30, 2021 and 2020 are brokered deposits totaling $91.7 million and $63.4 million, respectively. Interest expense on deposits was comprised of the following: Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) Checking and money market deposit accounts $ 3,580 $ 2,045 $ 899 Passbook, club and statement savings accounts 10 38 124 Certificate accounts 4,687 8,819 12,137 Total $ 8,277 $ 10,902 $ 13,160

ADVANCES FROM FEDERAL HOME LOAN

ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM	12 Months Ended
ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM	Sep. 30, 2021
ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM
ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM	9. ADVANCES FROM FEDERAL HOME LOAN BANK – SHORT TERM The years ended September 30, 2021 and 2020 outstanding balances and related information regarding short-term borrowings from the FHLB of Pittsburgh are summarized follows: At or For the Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) FHLB advances: Average balance outstanding $ 9,932 $ 66,735 $ 31,158 Maximum amount outstanding at any month-end during the period 25,000 115,000 90,000 Balance outstanding at end of period — 25,000 90,000 Average interest rate during the period 0.39 % 1.58 % 2.53 % Weighted average interest rate at end of period — % 0.39 % 2.32 % As of September 30, 2020, the $25.0 million borrowing consisted of one 90-day FHLB advance associated with an interest rate swap contract. The Bank maintains borrowing facilities with the FHLB of Pittsburgh, ACBB and the Federal Reserve Bank of Philadelphia and the terms and interest rates are subject to change on the date of execution of borrowings. Available borrowings are based on collateral with the facility. The Company maintains unsecured borrowing facilities with ACBB and PNC for $12.5 million and $10.0 million, respectively. Neither line has been drawn upon to date.

ADVANCES FROM FEDERAL HOME LO_2

ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM	12 Months Ended
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM	Sep. 30, 2021
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM	10. ADVANCES FROM FEDERAL HOME LOAN BANK – LONG TERM Pursuant to collateral agreements with the FHLB of Pittsburgh, advances are secured by a blanket collateral pledge of loans held by the Bank and qualifying fixed-income securities and FHLB stock. The long-term advances outstanding as of September 30, 2021 are as follows: Lomg-term FHLB advances: Maturity range Weighted average Stated interest rate range Description from to interest rate from to 2021 2020 (Dollars in Thousands) Fixed Rate - Amortizing 1 ‑ Oct ‑ 20 30 ‑ Sep ‑ 21 2.77 % 1.94 % 2.83 % — 5,179 Fixed Rate - Amortizing 1 ‑ Oct ‑ 21 30 ‑ Sep ‑ 22 2.96 % 1.99 % 3.05 % 2,227 5,523 Fixed Rate - Amortizing 1 ‑ Oct ‑ 22 30 ‑ Sep ‑ 23 2.89 % 1.94 % 3.11 % 3,551 5,265 Total 2.92 % $ 5,778 $ 15,967 Fixed Rate - Advances 1 ‑ Oct ‑ 20 30 ‑ Sep ‑ 21 2.37 % 1.42 % 2.92 % — 17,996 Fixed Rate - Advances 1 ‑ Oct ‑ 21 30 ‑ Sep ‑ 22 2.31 % 1.94 % 3.23 % 63,250 63,293 Fixed Rate - Advances 1 ‑ Oct ‑ 22 30 ‑ Sep ‑ 23 2.52 % 2.00 % 3.22 % 94,999 94,999 Fixed Rate - Advances 1 ‑ Oct ‑ 23 30 ‑ Sep ‑ 24 2.88 % 2.38 % 3.20 % 67,998 67,998 Total 2.57 % $ 226,247 $ 244,286 2.58 % Total $ 232,025 $ 260,253 Weighted Average Maturity in Fiscal Amount Coupon Rate (Dollars in Thousands) 2022 $ 65,477 2.33 % 2023 98,550 2.54 2024 67,998 2.88 $ 232,025 2.58 The Bank maintains a blanket collateral pledge agreement using qualifying loans with the FHLB of Pittsburgh for future borrowing needs. At September 30, 2021, the Bank had the ability to obtain $101.7 million of additional FHLB advances.

INCOME TAXES

INCOME TAXES	12 Months Ended
INCOME TAXES	Sep. 30, 2021
INCOME TAXES
INCOME TAXES	11. INCOME TAXES The Company files a consolidated federal income tax return. The Company uses the specific charge-off method for computing reserves for bad debts. Generally this method allows the Company to deduct an annual addition to the reserve for bad debts equal to its net charge-offs. The provision for income taxes for the fiscal years ended September 30, 2021, 2020 and 2019 consists of the following: Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) Current: Federal expense $ 564 $ 1,952 $ 2,133 State expense 28 93 205 Total current taxes 592 2,045 2,338 Deferred income tax expense (benefit) 677 (445) (188) Total income tax provision $ 1,269 $ 1,600 $ 2,150 Items that gave rise to significant portions of deferred income taxes are as follows: September 30, September 30, 2021 2020 (Dollars in Thousands) Deferred tax assets: Allowance for loan losses $ 1,716 $ 2,071 Nonaccrual interest 395 561 Accrued vacation 14 16 Capital loss carryforward 4 4 Split dollar life insurance 9 9 Post-retirement benefits 67 72 Realized loss on equity securities — 3 Unrealized losses on interest rate swaps 2,199 3,596 Deferred compensation 767 781 Goodwill 47 58 Lease liability 256 — Other 79 48 Employee benefit plans 242 187 Total deferred tax assets 5,795 7,406 Valuation allowance (4) (4) Total deferred tax assets, net of valuation allowance 5,791 7,402 Deferred tax liabilities: Property 127 137 Right of Use 233 — Realized gain on equity securities 3 — Unrealized gains on available for sale securities 1,621 2,813 Purchase accounting adjustments 394 321 Deferred loan fees 392 229 Total deferred tax liabilities 2,770 3,500 Net deferred tax assets $ 3,021 $ 3,902 The Company establishes a valuation allowance for deferred tax assets when management believes that the deferred tax assets are not likely to be realized either through a carry back to taxable income in prior years, future reversals of existing taxable temporary differences, and, to a lesser extent, future taxable income. The valuation allowance totaled $4,000 and $4,000 at September 30, 2021 and 2020, respectively. The income tax expense differs from that computed at the statutory federal corporate tax rate as follows: Year Ended September 30, 2021 2020 2019 Percentage Percentage Percentage of Pretax of Pretax of Pretax Amount Income Amount Income Amount Income (Loss) (Dollars in Thousands) Tax at statutory rate $ 1,900 21.0 % $ 2,343 21.0 % $ 2,453 21.0 % Adjustments resulting from: State tax expense 28 0.3 93 0.8 162 1.3 Tax exempt interest income (553) (6.1) (537) (4.8) (313) (2.7) Capital gain from sale of securities — — (117) (1.0) — — Earnings from bank owned life insurance (130) (1.4) (138) (1.2) (135) (1.1) Employee benefit plans 24 0.2 (27) (0.3) (27) (0.2) Other — — (17) (0.2) 10 0.1 Income tax expense $ 1,269 14.0 % $ 1,600 14.3 % $ 2,150 18.4 % There is currently no liability for uncertain tax positions and no known unrecognized tax benefits. The Company recognizes, when applicable, interest and penalties related to unrecognized tax benefits in the provision for income taxes in the Consolidated Statements of Operations as a component of income tax expense. The Company’s federal and state income tax returns for taxable years through September 30, 2017 have been closed for purposes of examination by the Internal Revenue Service and the Pennsylvania Department of Revenue.

REGULATORY CAPITAL REQUIREMENTS

REGULATORY CAPITAL REQUIREMENTS	12 Months Ended
REGULATORY CAPITAL REQUIREMENTS	Sep. 30, 2021
REGULATORY CAPITAL REQUIREMENTS
REGULATORY CAPITAL REQUIREMENTS	12. REGULATORY CAPITAL REQUIREMENTS The Company and the Bank are 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 Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and the Bank’s classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (set forth in the table below) of Tier 1 capital (as defined in the regulations) to average assets (as defined) and risk-weighted assets (as defined), Tier 1 common capital (as defined) to risk-weighted assets and total capital (as defined) to risk-weighted assets. Management believes, as of September 30, 2021 and 2020, that the Bank met all regulatory capital adequacy requirements to which it is subject. To be categorized as well capitalized, the Bank must maintain the minimum Tier 1 capital, Tier 1 common equity, Tier 1 risk-based and total risk-based ratios as set forth in the table below. The Company is not subject to the regulatory capital ratios imposed by Basel III on bank holding companies because the Company is deemed to be a small bank holding company. The Company’s and the Bank’s actual capital amounts and ratios are also presented in the following table: To Be Well Capitalized Under Prompt Required for Capital Corrective Action Actual Adequacy Purposes Provisions Amount Ratio Amount Ratio Amount Ratio (Dollars in Thousands) September 30, 2021: Tier 1 capital (to average assets) Company $ 126,281 11.48 % N/A N/A N/A N/A Bank 123,840 11.30 $ 43,855 4.0 % $ 54,819 5.0 % Tier 1 Common (to risk-weighted assets) Company 126,281 16.70 N/A N/A N/A N/A Bank 123,840 16.37 34,033 4.5 49,159 6.5 Tier 1 capital (to risk-weighted assets) Company 126,281 16.70 N/A N/A N/A N/A Bank 123,840 16.37 45,377 6.0 60,503 8.0 Total capital (to risk-weighted assets) Company 135,167 17.87 N/A N/A N/A N/A Bank 132,726 17.55 60,503 8.0 75,629 10.0 September 30, 2020: Tier 1 capital (to average assets) Company $ 125,618 10.34 % N/A N/A N/A N/A Bank 123,185 10.51 $ 46,867 4.0 % $ 58,584 5.0 % Tier 1 Common (to risk-weighted assets) Company 125,618 17.21 N/A N/A N/A N/A Bank 123,185 16.88 32,841 4.5 47,437 6.5 Tier 1 capital (to risk-weighted assets) Company 125,618 17.21 N/A N/A N/A N/A Bank 123,185 16.88 43,788 6.0 58,384 8.0 Total capital (to risk-weighted assets) Company 134,389 18.41 N/A N/A N/A N/A Bank 131,956 18.08 58,384 8.0 72,980 10.0

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	12 Months Ended
EMPLOYEE BENEFITS	Sep. 30, 2021
STOCK COMPENSATION PLANS
EMPLOYEE BENEFITS	13. EMPLOYEE BENEFITS The Bank is a member of a multi-employer (under the provisions of the Employee Retirement Income Security Act of 1974 and the Internal Revenue Code of 1986) defined benefit pension plan covering all employees meeting certain eligibility requirements. The Bank’s policy is to fund pension costs accrued. The expense relating to this plan for the years ended September 30, 2021, 2020 and 2019 was $780,000, $743,000 and $632,000, respectively. There are no collective bargaining agreements in place that require contributions to the plan. Additional information regarding the plan as of September 30, 2021 is noted below: Pentegra Defined Benefit Plan for Legal Name of Plan Financial Institutions Plan Employer Identification Number 13-5645888 The Company's Contribution for the year ended September 30, 2021 $ 780,000 Are Company's Contributions more than 5% of total contributions? No Funded Status 96.49 % The Pentegra Defined Benefits Plan for Financial Institutions is a single plan under Internal Revenue Code Section 413(c) and, as a result, all of the assets of the Plan stand behind all of the liabilities of the Plan. Accordingly, under the Plan, contributions made by a participating employer may be used to provide benefits to participants of other participating employers. In November 2017, participation in the plan by Bank employees was frozen in an effort to reduce expenses on a going forward basis. The Bank also has a defined contribution plan for employees meeting certain eligibility requirements. The defined contribution plan may be terminated at any time at the discretion of the Bank. There were expenses relating to this plan for the fiscal years ended September 30, 2021, 2020 and 2019 of $254,000, $231,000 and $126,000, respectively. The Company maintains the 2008 Recognition and Retention Plan (“2008 RRP”) which is administered by a committee of the Board of Directors of the Company. The RRP provides for the grant of shares of common stock of the Company to officers, employees and directors of the Company. Grants can no longer be made pursuant to the 2008 RRP even if previously awarded grants are forfeited. During February 2015, shareholders approved the 2014 Stock Incentive Plan (the “2014 SIP”). As part of the 2014 SIP, a maximum of 285,655 shares of common stock can be awarded as restricted stock awards or units, of which 233,500 shares were awarded during February 2015. In March 2019, the Company granted 8,209 shares under the 2008 RRP and 18,291 shares under the 2014 SIP. There were no shares awarded during 2020 and 2021. Shares subject to awards under either plan generally vest at the rate of 20% per year over five years. A summary of the Company’s non-vested stock award activity for the year ended September 30, 2021 is presented in the following table: Year Ended September 30, 2021 Number of Weighted Average Shares Grant Date Fair Value Non-vested stock awards at October 1, 2020 23,056 $ 17.78 Granted — — Forfeited — — Vested (11,085) 17.30 Non-vested stock awards at September 30, 2021 11,971 $ 18.24 The Company maintains the 2008 Stock Option Plan (the “Option Plan”) which authorizes the grant of stock options to officers, employees and directors of the Company to acquire shares of common stock with an exercise price at least equal to the fair market value of the common stock on the grant date. Options generally become vested and exercisable at the rate of 20% per year over five years and are generally exercisable for a period of ten years after the grant date. A total of 533,808 (on a converted basis) shares of common stock were approved for future issuance pursuant to the Option Plan. As of September 30, 2019, all of the options had been awarded under the Option Plan and no grants can be made in the future by the Option Plan even if previously awarded grants are forfeited. The 2014 SIP reserved up to 714,145 shares for issuance pursuant to options. In July 2019, the Company granted 39,702 shares under the 2014 SIP. In September 2020, the Company granted 12,500 shares under the 2014 SIP. In June 2021, the Company granted 4,500 shares under the 2014 SIP. A summary of the status of the Company’s stock options under the Option Plan and the 2014 SIP as of September 30, 2021 and changes during the year ended September 30, 2021 are presented below: Year Ended September 30, 2021 Number of Weighted Average Shares Exercise Price Options outstanding at October 1, 2020 571,258 $ 14.58 Granted 4,500 13.86 Exercised (15,000) 12.23 Forfeited (39,500) 18.42 Outstanding at September 30, 2021 521,258 $ 14.23 Exercisable at September 30, 2021 418,471 $ 13.74 The weighted average remaining contractual term of the outstanding options was approximately 5.1 years for options outstanding as of September 30, 2021. The estimated fair value of options granted during fiscal 2019 was $3.38 per share, $2.31 for options granted in fiscal 2020 and $3.91 for options granted in fiscal 2021. The fair value for grants made in fiscal 2019 was estimated on the date of grant using the Black-Scholes pricing model with the following assumptions: an exercise and fair value of $18.16, term of seven years, volatility rate of 17.76%, interest rate of 1.87% and a yield rate of 1.10%. The fair value for grants made in fiscal 2020 was estimated on the date of grant using the Black-Scholes pricing model with the following assumptions: an exercise and fair value of $10.00, term of seven years, volatility rate of 33.22%, interest rate of 0.41% and a yield rate of 2.80%. The fair value for grants made in fiscal 2021 was estimated on the date of grant using the Black-Scholes pricing model with the following assumptions: an exercise and fair value of $13.86, term of seven years, volatility rate of 34.46%, interest rate of 1.19% and a yield rate of 2.02%. During the year ended September 30, 2021, $169,000 was recognized in aggregate compensation expense for the Option Plan and the 2014 SIP. During the year ended September 30, 2020, $353,000 was recognized in aggregate compensation expense for the Option Plan and the 2014 SIP. During the year ended September 30, 2019, $573,000 was recognized in aggregate compensation expense for the Option Plan and the 2014 SIP. At September 30, 2021, approximately $271,000 of additional compensation expense for awarded options remained unrecognized. The weighted average period over which this expense will be recognized is approximately 2.0 years.

INTEREST RATE SWAP AGREEMENTS

INTEREST RATE SWAP AGREEMENTS	12 Months Ended
INTEREST RATE SWAP AGREEMENTS	Sep. 30, 2021
INTEREST RATE SWAPS
INTEREST RATE SWAP AGREEMENTS	14. INTEREST RATE SWAP AGREEMENTS The Company uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the payment of either fixed or variable-rate amounts in exchange for the receipt of variable or fixed-rate amounts from a counterparty, respectively. The Company uses interest rate swaps to manage its exposure to changes in fair value. Interest rate swaps designated as fair value hedges involve the receipt of variable-rate payments from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. The Company has contracted with a third party to participate in interest rate swap contracts. There are thirteen additional cash flow hedges tied to wholesale funding at September 30, 2021. These interest rate swaps involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments. During the fiscal year ended September 30, 2021, $5,000 of income was recognized as ineffectiveness through earnings, while $4,000 of expense was recognized as ineffectiveness through earnings during fiscal 2020. $12,000 of income was recognized as ineffectiveness through earnings during fiscal 2019. There were nine interest rate swaps designated as fair value hedges involving the receipt of variable-rate payments from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements that were applicable to four loans and seven investment securities as of September 30, 2021 and there were nine interest rate swaps designated as fair value hedges involving the receipt of variable-rate payments from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements that were applicable to three loans and seven investment securities three loans and seven investments at September 30, 2020. The fair value of the swaps is recorded in the other liabilities section of the Consolidated Statements of Financial Condition. Below is a summary of the interest rate swap agreements and the terms as of September 30, 2021 and 2020. 2021 Hedged Notional Pay Rate Receive Maturity Date Unrealized Item Amount from to Rate from to Loss (Dollars in thousands) State and political subdivisions $ 21,570 3.06 % 3.07 % 3 Mth Libor 1-Feb-27 1-May-28 $ (2,365) Commercial loans 23,656 4.10 % 5.74 % 1 Mth Libor +225 to 276 bp 13-Jun-25 1-Aug-26 — 30 day wholesale funding 90,000 1.36 % 2.70 % 1 Mth Libor 15-Feb-24 12-Jun-26 (3,495) 90 day wholesale funding 135,000 2.51 % 2.78 % 3 Mth Libor 11-Jan-24 27-Mar-24 (6,974) $ (12,834) 2020 Hedged Notional Pay Rate Receive Maturity Date Unrealized Item Amount from to Rate from to Loss (Dollars in t housands) State and political subdivisions $ 21,570 3.06 % 3.07 % 3 Mth Libor 1-Feb-27 1-May-28 $ (3,834) Commercial loans 23,656 4.10 % 5.74 % 1 Mth Libor +225 to 276 bp 13-Jun-25 1-Aug-26 — 30 day wholesale funding 90,000 1.36 % 2.70 % 1 Mth Libor 15-Feb-24 12-Jun-26 (6,157) 90 day wholesale funding 135,000 2.51 % 2.78 % 3 Mth Libor 11-Jan-24 27-Mar-24 (10,969) $ (20,960)

COMMITMENTS AND CONTINGENT LIAB

COMMITMENTS AND CONTINGENT LIABILITIES	12 Months Ended
COMMITMENTS AND CONTINGENT LIABILITIES	Sep. 30, 2021
COMMITMENTS AND CONTINGENT LIABILITIES
COMMITMENTS AND CONTINGENT LIABILITIES	15. COMMITMENTS AND CONTINGENT LIABILITIES At September 30, 2021, the Company had $34.9 million in outstanding commitments to originate fixed and variable-rate loans with market interest rates ranging from 2.99% to 5.00%. At September 30, 2020, the Company had $29.9 million in outstanding commitments to originate fixed and variable-rate loans with market interest rates ranging from 3.25% to 4.75%. The aggregate undisbursed portion of loans-in-process amounted to $80.6 million and $86.9 million, respectively, at September 30, 2021 and 2020. The Company also had commitments under unused lines of credit of $68.1 million as of September 30, 2021 and $40.1 million as of September 30, 2020 and letters of credit outstanding of $1.2 million as of September 30, 2021 and $1.1 million as of September 30, 2020. The Company is subject to various pending claims and contingent liabilities arising in the normal course of business which are not reflected in the accompanying consolidated financial statements. Management considers that the aggregate liability, if any, resulting from such matters will not be material. Among the Company’s contingent liabilities are exposures to limited recourse arrangements with respect to the Company’s sales of whole loans and participation interests. At September 30, 2021, the exposure, which represents a portion of credit risk associated with the sold interests, amounted to $600,000. This exposure is for the life of the related loans and payables, on the Company’s proportionate share, as actual losses are incurred. The Company is involved in various legal proceedings occurring in the ordinary course of business. Management of the Company, based on discussions with litigation counsel, does not believe that such proceedings will have a material adverse effect on the financial condition or operations of the Company. However, there can be no assurance that any of the outstanding legal proceedings to which the Company is party will not be decided adversely to the Company’s interest and have a material adverse effect on the financial condition and results of operations of the Company.

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	12 Months Ended
FAIR VALUE MEASUREMENT	Sep. 30, 2021
FAIR VALUE MEASUREMENT
FAIR VALUE MEASUREMENT	The fair value estimates presented herein are based on pertinent information available to management as of September 30, 2021 and 2020, respectively. Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date and, therefore, current estimates of fair value may differ significantly from the amounts presented herein. Generally accepted accounting principles used in the United States establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value. The three broad levels of hierarchy are as follows: Level 1 Level 2 Level 3 Those assets as of September 30, 2021 which are measured at fair value on a recurring basis are as follows: Category Used for Fair Value Measurement Level 1 Level 2 Level 3 Total (Dollars in Thousands) Assets: Securities available for sale: U.S. Government and agency obligations $ — $ 3,194 $ — $ 3,194 State and political subdivisions — 72,259 — 72,259 Mortgage-backed securities - U.S. Government agencies — 135,353 — 135,353 Corporate bonds — 95,141 — 95,141 Equity security - FHLMC preferred stock 22 — — 22 Total $ 22 $ 305,947 $ — $ 305,969 Liabilities: Interest rate swap contracts $ — $ 12,834 $ — $ 12,834 Total $ — $ 12,834 $ — $ 12,834 Those assets as of September 30, 2020 which are measured at fair value on a recurring basis are as follows: Category Used for Fair Value Measurement Level 1 Level 2 Level 3 Total (Dollars in Thousands) Assets: Securities available for sale: U.S. Government and agency obligations $ — $ 22,394 $ — $ 22,394 State and political subdivisions — 79,621 — 79,621 Mortgage-backed securities - U.S. Government agencies — 236,566 — 236,566 Corporate bonds — 81,783 — 81,783 Equity security - FHLMC preferred stock 51 — — 51 Total $ 51 $ 420,364 $ — $ 420,415 Liabilities: Interest rate swap contracts $ — $ 20,960 $ — $ 20,960 Total $ — $ 20,960 $ — $ 20,960 Certain assets are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The Company measures impaired loans and real estate owned at fair value on a non-recurring basis. Investments and Mortgage-Backed Securities The fair value of investment and mortgage-backed securities is based on quoted market prices, dealer quotes, and prices obtained from independent pricing services. Collateral dependent impaired loans are based on the fair value of the collateral which is based on appraisals and would be categorized as Level 2 measurement. In some cases, adjustments are made to the appraised values for various factors including the age of the appraisal, age of the comparable included in the appraisal, and known changes in the market and in the collateral. These adjustments are based upon unobservable inputs, and therefore, the fair value measurement of these assets has been categorized as a Level 3 measurement. These loans are reviewed for impairment and written down to their net realizable value by charges against the allowance for loan losses. The collateral underlying these loans had a fair value of $8.4 million and $13.0 million at September 30, 2021 and 2020, respectively. Real Estate Owned Once an asset is determined to be uncollectible, the underlying collateral is generally repossessed and reclassified to foreclosed real estate and repossessed assets. These repossessed assets are carried at the lower of cost or fair value of the collateral, based on independent appraisals, less cost to sell and would be categorized as Level 3 measurement. In some cases, adjustments are made to the appraised values for various factors including the age of the appraisal, the age of the comparables included in the appraisal, and known changes in the market and in the collateral. Thus the evaluations are based upon unobservable inputs, and therefore, the fair value measurement of these assets has been categorized as a Level 3 measurement. Summary of Non-Recurring Fair Value Measurements At September 30, 2021 (Dollars in Thousands) Level 1 Level 2 Level 3 Total Other real estate owned $ — $ — $ 4,109 $ 4,109 Total $ — $ — $ 4,109 $ 4,109 The following table provides information describing the valuation process used to determine nonrecurring fair value measurements categorized within level 3 of the fair value hierarchy: At September 30, 2021 (Dollars in Thousands) Valuation Range/ Fair Value Technique Unobservable Input Weighted Ave. Other real estate owned $ 4,109 Property appraisals (1) (3) Management discount for selling costs, property type and market volatility (2) 2% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally includes various level 3 inputs, which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal. (3) Includes qualitative adjustments by management and estimated liquidation expenses. The fair value of financial instruments has been determined by the Company using available market information and appropriate valuation methodologies. However, considerable judgment is necessarily required to interpret market data to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange. The estimated fair values of the Company’s financial instruments that are not required to be measured or reported at fair value were as follows at September 30, 2021 and September 30, 2020. Fair Value Measurements at Carrying Fair September 30, 2021 Amount Value (Level 1) (Level 2) (Level 3) (Dollars in Thousands) Assets: Investment and mortgage-backed securities held to maturity $ 20,074 $ 21,161 $ — $ 21,161 $ — Loans receivable, net 618,206 620,017 — — 620,017 Liabilities: Certificates of deposit 244,877 252,510 — — 252,510 Advances from FHLB -long-term 232,025 239,301 — — 239,301 Fair Value Measurements at Carrying Fair September 30, 2020 Amount Value (Level 1) (Level 2) (Level 3) (Dollars in Thousands) Assets: Investment and mortgage-backed securities held to maturity $ 22,860 $ 24,330 $ — $ 24,330 $ — Loans receivable, net 588,300 593,768 — — 593,768 Liabilities: Certificates of deposit 269,610 278,224 — — 278,224 Advances from FHLB -long-term 260,253 274,172 — — 274,172

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS	Sep. 30, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS	17. GOODWILL AND OTHER INTANGIBLE ASSETS The Company’s goodwill and intangible assets are related to the acquisition of Polonia Bancorp completed as of January 1, 2017. Balance Balance October 1, Additions/ September 30, Amortization 2020 Adjustments Amortization 2021 Period (Dollars in Thousands) Goodwill $ 6,102 $ — $ — $ 6,102 Core deposit intangible 340 — (94) 246 10 years $ 6,442 $ — $ (94) $ 6,348 As of September 30, 2021, the future fiscal periods amortization expense for the core deposit intangible is: (Dollars In Thousands) 2022 $ 78 2023 64 2024 49 2025 34 2026 18 Thereafter 3 $ 246

LEASES

LEASES	12 Months Ended
LEASES	Sep. 30, 2021
LEASES [Abstract]
LEASES	18. LEASES Operating leases in which the Company is the lessee are recorded as operating lease Right of Use ("ROU") assets and operating lease liabilities, included in other assets and other liabilities, respectively, on the Consolidated Statements of Financial Condition. The Company does not currently have any finance leases. Operating lease ROU assets represent the right to use an underlying asset during the lease term and operating lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities were recognized as of the date of adoption of ASU 2017-02 based on the present value of the remaining lease payments using a discount rate that represented the then Company's incremental borrowing rate at the date of initial application. Operating lease expense, which is comprised of amortization of the ROU assets and the implicit interest accreted on the operating lease liability, is recognized on a straight line basis over the remaining lease term of the operating lease, and is recorded in office occupancy expense in the Consolidated Statements of Operations. The leases relate to Bank branches with remaining lease terms of generally five Lease expense was $239,000, $236,000 and $304,000 for the years ended September 30, 2021, 2020 and 2019, respectively. The Company has executed certain lease commitments and is, as a result, obligated to pay the following amounts: $246,000 for fiscal year 2022, $249,000 for fiscal year 2023, $252,000 for fiscal year 2024, $266,000 for fiscal 2025, $169,000 for fiscal 2026 and $309,000 thereafter As of September 30, 2021, operating lease ROU assets The following table summarizes other information related to our operating leases: September 30, 2021 Weighted-average remaining lease term - operating leases in years 6.25 Weighted-average discount rate - operating leases 2.0 % The following table presents aggregate lease (Dollars in Thousands) 2022 $ 213 2023 216 2024 220 2025 231 2026 126 2027 and thereafter 291 Total lease payments 1,297 Less: interest 77 Present value of lease liabilities $ 1,220

PRUDENTIAL BANCORP, INC. (PAREN

PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)	12 Months Ended
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)	Sep. 30, 2021
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)	19. PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) STATEMENT OF FINANCIAL CONDITION September 30, 2021 2020 (Dollars in Thousands) Assets: Cash $ 854 $ 955 Investment in Bank 128,014 126,684 Other assets 1,588 1,478 Total assets $ 130,456 $ 129,117 Stockholders' equity: Preferred stock $ — $ — Common stock 108 108 Additional paid-in-capital 118,424 118,270 Treasury stock (44,351) (39,207) Retained earnings 58,450 52,889 Accumulated other comprehensive loss (2,175) (2,943) Total stockholders' equity $ 130,456 $ 129,117 STATEMENT OF OPERATIONS 2021 2020 2019 (Dollars in Thousands) Equity in the earnings of the Bank $ 8,221 $ 9,959 $ 9,954 Total income 8,221 9,959 9,954 Professional services 180 168 168 Other expense 378 344 369 Total expense 558 512 537 Income before income taxes 7,663 9,447 9,417 Income tax benefit (117) (108) (113) Net income $ 7,780 $ 9,555 $ 9,530 CASH FLOWS 2021 2020 2019 (Dollars in Thousands) Operating activities: Net income $ 7,780 $ 9,555 $ 9,530 Other, net (50) 52 (115) Equity in the undistributed earnings of the Bank (8,221) (9,959) (9,954) Net cash used in operating activities (491) (352) (539) Financing activities: Purchase of treasury stock (5,391) (10,481) (3,108) Cash dividends paid (2,219) (6,216) (5,784) Dividends from the Bank 8,000 17,000 5,000 Net cash provided by (used in) financing activities 390 303 (3,892) Net decrease in cash and cash equivalents (101) (49) (4,431) Cash and cash equivalents, beginning of year 955 1,004 5,435 Cash and cash equivalents, end of year $ 854 $ 955 $ 1,004

CONSOLIDATED QUARTERLY FINANCIA

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)	Sep. 30, 2021
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)	20. CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) Unaudited quarterly financial data for the years ended September 30, 2021, 2020, and 2019 is as follows: September 30, 2021 September 30, 2020 1st 2nd 3rd 4th 1st 2nd 3rd 4th Qtr Qtr Qtr Qtr Qtr Qtr Qtr Qtr (Dollars in Thousands, Except Per Share Data) Interest income $ 9,689 $ 9,464 $ 9,339 $ 9,544 $ 11,827 $ 11,010 $ 9,791 $ 9,599 Interest expense 4,006 3,740 3,566 3,486 5,484 5,222 4,486 4,233 Net interest income 5,683 5,724 5,773 6,058 6,343 5,788 5,305 5,366 Provision for loan losses — — — 200 125 500 750 1,650 Net interest income after provision for loan losses 5,683 5,724 5,773 5,858 6,218 5,288 4,555 3,716 Non-interest income 537 575 1,395 1,132 832 2,668 3,762 841 Non-interest expense 4,097 4,350 4,543 4,638 4,021 4,460 3,996 4,248 Income before income tax expense (benefit) 2,123 1,949 2,625 2,352 3,029 3,496 4,321 309 Income tax expense (benefit) 286 235 387 361 566 572 701 (239) Net income $ 1,837 $ 1,714 $ 2,238 $ 1,991 $ 2,463 $ 2,924 $ 3,620 $ 548 Per share: Earnings per share - basic $ 0.23 $ 0.22 $ 0.28 $ 0.25 $ 0.28 $ 0.33 $ 0.44 $ 0.07 Earnings per share - diluted $ 0.23 $ 0.22 $ 0.28 $ 0.25 $ 0.28 $ 0.32 $ 0.44 $ 0.07 Dividends per share $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.50 $ 0.07 $ 0.07 September 30, 2019 1st 2nd 3rd 4th Qtr Qtr Qtr Qtr (Dollars in Thousands, Except Per Share Data) Interest income $ 10,002 $ 11,134 $ 11,273 $ 11,631 Interest expense 3,986 4,811 5,058 5,434 Net interest income 6,016 6,323 6,215 6,197 Provision for loan losses — — — 100 Net interest income after provision for loan losses 6,016 6,323 6,215 6,097 Non-interest income 380 542 1,187 985 Non-interest expense 4,033 4,146 4,190 3,696 Income before income tax expense 2,363 2,719 3,212 3,386 Income tax expense 389 380 582 799 Net income $ 1,974 $ 2,339 $ 2,630 $ 2,587 Per share: Earnings per share - basic $ 0.22 $ 0.27 $ 0.30 $ 0.30 Earnings per share - diluted $ 0.22 $ 0.26 $ 0.29 $ 0.29 Dividends per share $ 0.05 $ 0.05 $ 0.50 $ 0.05 Due to rounding, the sum of the earnings per share in individual quarters may differ from reported amounts.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Consolidation	Consolidation – .
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements —
Cash and Cash Equivalents	Cash and Cash Equivalents —
Certificates of Deposit	Certificates of Deposit— one
Investment Securities and Mortgage-Backed Securities	Investment Securities and Mortgage-Backed Securities — Held to Maturity Available for Sale are reported net of tax as a separate component of stockholders’ equity until realized. Realized gains or losses on the sale of investment and mortgage-backed securities are reported in earnings as of the trade date and determined using the adjusted cost of the specific security sold. Premiums are amortized and discounts are accreted using the interest method over the estimated remaining term of the underlying security. Equity Securities
Other-than-temporary impairment	Other-than-temporary impairment
Loans Receivable	Loans Receivable —
Loan Origination and Commitment Fees	Loan Origination and Commitment Fees —
Interest on Loans	Interest on Loans —
Allowance for Loan Losses	Allowance for Loan Losses— Impaired loans are loans for which it is not probable to collect all amounts due according to the contractual terms of the loan agreements. Management individually evaluates such loans for impairment and does not aggregate loans by major risk classifications. Factors considered by management in determining impairment include payment status and collateral value. The amount of impairment for impaired loans is determined by the difference between the present value of the expected cash flows related to the loans, using the original interest rate, and their recorded value, or as a practical expedient in the case of collateralized loans, the difference between the fair value of the collateral and the recorded amount of the loans. When foreclosure is probable, impairment is measured based on the then fair value of the collateral. Mortgage loans and consumer loans are comprised of large groups of smaller balance homogeneous loans which are evaluated for impairment collectively. Loans that experience insignificant payment delays, which are defined as delays of less than 90 days, generally are not classified as impaired. Management determines the significance of payment delays 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 borrower’s prior payment record, and the amount of shortfall in relation to the principal and interest owed.
Real Estate Owned	Real Estate Owned —
Restricted Bank Stock	Restricted Bank Stock – The Bank is a member of the FHLB of Pittsburgh and as such, is required to maintain a minimum investment in stock of the FHLB that varies with the level of advances outstanding with the FHLB. The stock is bought from and sold to the FHLB based upon its $100 par value. The stock does not have a readily determinable fair value and as such is classified as restricted stock, carried at cost and evaluated for impairment by management. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) the significance of the decline in net assets of the FHLB as compared to the capital stock amount and the length of time this situation has persisted; (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance; (c) the impact of legislative and regulatory changes on the customer base of the FHLB; and (d) the liquidity position of the FHLB. The FHLB of Pittsburgh continues to report net income, continues to declare quarterly cash dividends and had its Aaa bond rating affirmed by Moody’s and its AA+ rating affirmed by Standard and Poor’s, which ratings during 2021 remained unchanged as of September 30, 2021. With consideration given to these factors, management concluded that the stock was not impaired at September 30, 2021 or 2020. In 2018, the Bank purchased $90,000 of stock in ACBB to support a $12.5 million line of credit. The line has not been drawn on.
Office Properties and Equipment	Office Properties and Equipment —
Cash Surrender Value of Life Insurance	Cash Surrender Value of Life Insurance—
Dividend Payable	Dividend Payable
Goodwill	Goodwill
Share-Based Compensation	Share-Based Compensation
Treasury Stock	Treasury Stock –
Comprehensive Income	Comprehensive Income
Income Taxes	Income Taxes— In evaluating the Company’s ability to recover deferred tax assets, management considers all available positive and negative evidence, including past operating results and forecast of future taxable income. In determining future taxable income, management makes assumptions for the amount of taxable income, the reversal of temporary differences and the implementation of feasible and prudent tax planning strategies. These assumptions require management to make judgments about future taxable income and are consistent with the plans and estimates the Company uses to manage the business. Any reduction in estimated future taxable income may require management to record an additional valuation allowance against the deferred tax assets. An increase in the valuation allowance would result in additional income tax expense in the period and could have a significant impact on our future earnings.
Transfers and Servicing of Financial Assets and Extinguishments of Liabilities	Transfers and Servicing of Financial Assets and Extinguishments of Liabilities —
Interest Rate Swap Agreement	Interest Rate Swap Agreement - For the fair value hedges, changes in the fair value of the interest rate swap are expected to be “perfectly effective” in offsetting changes in the fair value of the hedged item, thus no portion of the change in market value is anticipated to be recognized in earnings. For cash flow hedges, the net settlement (upon close-out or termination) that offsets changes in the value of the hedged debt is deferred and amortized into net interest income over the life of the hedged debt. For fair value hedges, the net settlement (upon close-out or termination) that offsets changes in the value of the loans adjusts the basis of the loans and is deferred and amortized to loan interest income over the life of the loans. The portion, if any, of the net settlement amount that did not offset changes in the value of the hedged asset or liability is recognized immediately in non-interest income. Interest rate derivative financial instruments receive hedge accounting treatment only if they are designated as a hedge and are expected to be, and are, effective in substantially reducing interest rate risk arising from the assets and liabilities identified as exposing the Company to risk. Those derivative financial instruments that do not meet specified hedging criteria would be recorded at fair value, with changes in fair value recorded in income. If periodic assessment indicates derivatives no longer provide an effective hedge, the derivative contracts would be closed out and settled, or classified as a trading activity.
Loans Acquired	Loans Acquired For purchased loans acquired that are not deemed impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Loans are aggregated and accounted for as a pool of loans if the loans being aggregated have common risk characteristics. Subsequent to the purchase date, the methods utilized to estimate the required allowance for credit losses for these loans is similar to originated loans; however, the Company records a provision for loan losses only when the required allowance exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loans.
Revenue Recognition	Revenue Recognition - Service charges on deposit accounts consist of account analysis fees (i.e. net fees earned on analyzed business and public checking accounts), monthly service fees, check orders, and other deposit account related fees. The Company’s performance obligation for account analysis fees and monthly service fees is generally satisfied, and the related revenue recognized, over the period in which the service is provided. Check orders and other deposit account related fees are largely transactional based, and therefore, the Company’s performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Fees, interchange, and other service charges are primarily comprised of debit card income, ATM fees, cash management income, and other services charges. Debit card income is primarily comprised of interchange fees earned whenever the Company’s debit cards are processed through card payment networks such as Mastercard. ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a company ATM. Other service charges include revenue from processing wire transfers, bill pay service, cashier’s checks, and other services. The Company’s performance obligation for fees, exchange, and other service charges are largely satisfied, and related revenue recognized when the services are rendered or upon completion. Payment is typically received immediately or in the following month.
Reclassification of Comparative Amounts	Reclassification of Comparative Amounts -
Recently Adopted Accounting Pronouncements

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
EARNINGS PER SHARE (Tables)	Sep. 30, 2021
EARNINGS PER SHARE
Schedule of basic and diluted earnings per share	Year Ended September 30, 2021 2020 2019 (Dollars in Thousands Except Per Share Data) Basic Diluted Basic Diluted Basic Diluted Net income $ 7,780 $ 7,780 $ 9,555 $ 9,555 $ 9,530 $ 9,530 Weighted average common shares outstanding 7,935,143 7,935,143 8,538,006 8,538,006 8,777,794 8,777,794 Effect of CSEs — 17,794 — 24,470 — 158,083 Adjusted weighted average common shares used in earnings per share computation 7,935,143 7,952,937 8,538,006 8,562,476 8,777,794 8,935,877 Earnings per share $ 0.98 $ 0.98 $ 1.12 $ 1.12 $ 1.09 $ 1.07

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	12 Months Ended
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	Sep. 30, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]
Schedule of changes in accumulated other comprehensive (loss) income	Year Ended September 30, 2021 2021 2021 2020 2020 2020 (Dollars in Thousands) Total Total accumulated accumulated Unrealized gain Unrealized gain (loss) other Unrealized gain Unrealized loss other (loss) on AFS on interest rate swaps comprehensive (loss) on AFS on interest rate comprehensive securities (a) (a) income (loss) securities (a) swaps (a) income (loss) Beginning Balance, October 1 $ 10,585 $ (13,528) $ (2,943) $ 8,098 $ (6,906) $ 1,192 Other comprehensive (loss) income before reclassification (3,188) 5,255 2,067 7,221 (6,622) 599 Amount reclassified from accumulated other comprehensive income (1,299) — (1,299) (4,734) — (4,734) Ending Balance, September 30 $ 6,098 $ (8,273) $ (2,175) $ 10,585 $ (13,528) $ (2,943) Year Ended September 30, 2019 2019 2019 (Dollars in Thousands) Total accumulated Unrealized gain Unrealized gain (loss) other (loss) on AFS on interest rate swaps comprehensive securities (a) (a) income (loss) Beginning Balance, October 1 $ (8,320) $ 166 $ (8,154) Other comprehensive (loss) income before reclassification 17,278 (7,072) 10,206 Amount reclassified from accumulated other comprehensive income (835) — (835) Reclassification for net gains recorded in net income (25) — (25) Ending Balance, September 30 $ 8,098 $ (6,906) $ 1,192 (a) All amounts are net of tax. Amounts in parentheses indicate debits.
Schedule of amounts reclassified out of each component of accumulated other comprehensive (loss) income	Year Ended September 30, 2021 2021 2021 2020 2020 2020 (Dollars in Thousands) Securities Swaps Total Securities Swaps Total Unrealized gain $ 1,644 (1) $ — $ 1,644 $ 5,993 (1) $ — $ 5,993 Income taxes (345) (2) — (345) (1,259) (2) — (1,259) $ 1,299 $ — $ 1,299 $ 4,734 $ — $ 4,734 Year Ended September 30, 2019 2019 2019 (Dollars in Thousands) Securities Swaps Total Unrealized gain $ 1,057 (1) $ — $ 1,057 Income taxes (222) (2) — (222) $ 835 $ — $ 835 (1) Recorded as a gain on the sale of investment and mortgage-backed securities available for sale. (2) Recorded as income tax expense

INVESTMENT AND MORTGAGE-BACKE_2

INVESTMENT AND MORTGAGE-BACKED SECURITIES (Tables)	12 Months Ended
INVESTMENT AND MORTGAGE-BACKED SECURITIES (Tables)	Sep. 30, 2021
INVESTMENT AND MORTGAGE-BACKED SECURITIES
Schedule of amortized cost and fair value of securities, with gross unrealized gains and losses	The amortized cost and fair value of securities, with gross unrealized gains and losses, are as follows: September 30, 2021 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in Thousands) Securities Available for Sale: U.S. government and agency obligations $ 3,117 $ 77 $ — $ 3,194 State and political subdivisions 70,625 1,793 (159) 72,259 Mortgage-backed securities - U.S. government agencies 131,842 4,267 (756) 135,353 Corporate debt securities 92,645 2,683 (187) 95,141 Total debt securities available for sale $ 298,229 $ 8,820 $ (1,102) $ 305,947 Securities Held to Maturity: U.S. government and agency obligations $ 1,000 $ 173 $ — $ 1,173 State and political subdivisions 14,983 727 — 15,710 Mortgage-backed securities - U.S. government agencies 4,091 211 (24) 4,278 Total securities held to maturity $ 20,074 $ 1,111 $ (24) $ 21,161 September 30, 2020 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (Dollars in Thousands) Securities Available for Sale: U.S. government and agency obligations $ 22,241 $ 153 $ — $ 22,394 State and political subdivisions 79,099 1,940 (1,418) 79,621 Mortgage-backed securities - U.S. government agencies 226,863 9,774 (71) 236,566 Corporate debt securities 78,764 3,564 (545) 81,783 Total debt securities available for sale $ 406,967 $ 15,431 $ (2,034) $ 420,364 Securities Held to Maturity: U.S. government and agency obligations $ 1,000 $ 236 $ — $ 1,236 State and political subdivisions 18,076 925 — 19,001 Mortgage-backed securities - U.S. government agencies 3,784 309 — 4,093 Total securities held to maturity $ 22,860 $ 1,470 $ — $ 24,330
Schedule of gross unrealized losses and related fair values of investment securities	Less than 12 months More than 12 months Total Gross Gross Gross Unrealized Fair Unrealized Fair Unrealized Fair Losses Value Losses Value Losses Value (Dollars in Thousands) Securities Available for Sale: State and political subdivisions $ (93) $ 14,383 $ (66) $ 4,417 $ (159) $ 18,800 Mortgage-backed securities -U.S. government agencies (487) 18,493 (269) 7,849 (756) 26,342 Corporate debt securities (187) 24,816 — — (187) 24,816 Total securities available for sale $ (767) $ 57,692 $ (335) $ 12,266 $ (1,102) $ 69,958 Securities Held to Maturity: Mortgage-backed securities -U.S. government agencies $ (24) $ 1,269 $ — $ — $ (24) $ 1,269 Total securities held to maturity $ (24) $ 1,269 $ — $ — $ (24) $ 1,269 Total $ (791) $ 58,961 $ (335) $ 12,266 $ (1,126) $ 71,227 Less than 12 months More than 12 months Total Gross Gross Gross Unrealized Fair Unrealized Fair Unrealized Fair Losses Value Losses Value Losses Value (Dollars in Thousands) Securities Available for Sale: State and political subdivisions $ (126) $ 10,735 $ (1,292) $ 24,510 $ (1,418) $ 35,245 Mortgage-backed securities - US government agencies (66) 10,025 (5) 584 (71) 10,609 Corporate debt securities (545) 16,472 — — (545) 16,472 Total securities available for sale $ (737) $ 37,232 $ (1,297) $ 25,094 $ (2,034) $ 62,326
Schedule of amortized cost and fair value of debt securities by contractual maturity	September 30, 2021 Held to Maturity Available for Sale Amortized Fair Amortized Fair Cost Value Cost Value (Dollars in Thousands) Due within one year $ 1,035 $ 1,049 $ — $ — Due after one through five years 4,444 4,792 40,137 41,330 Due after five through ten years 6,465 6,730 54,223 55,628 Due after ten years 4,039 4,312 72,027 73,636 Total $ 15,983 $ 16,883 $ 166,387 $ 170,594

LOANS RECEIVABLE (Tables)

LOANS RECEIVABLE (Tables)	12 Months Ended
LOANS RECEIVABLE (Tables)	Sep. 30, 2021
LOANS RECEIVABLE
Schedule of loans receivable	September 30, September 30, 2021 2020 (Dollars in Thousands) One-to-four family residential $ 202,330 $ 233,872 Multi-family residential 76,122 31,100 Commercial real estate 165,992 139,943 Construction and land development 205,413 260,648 Loans to financial institutions — 6,000 Commercial business 57,236 12,916 Leases — 176 Consumer 530 604 Total loans 707,623 685,259 Undisbursed portion of loans-in-process (80,620) (86,862) Deferred loan fees (280) (1,794) Allowance for loan losses (8,517) (8,303) Net loans $ 618,206 $ 588,300
Schedule of loans individually and collectively evaluated for impairment by loan segment	The following table summarizes the loans individually and collectively evaluated for impairment by loan segment at September 30, 2021: One to four Multi-family Commercial Construction and Commercial family residential residential real estate land development business Consumer Unallocated Total (Dollars in Thousands) Allowance for loan losses: Individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 1,665 1,051 2,220 1,968 799 15 799 8,517 Total ending allowance balance $ 1,665 $ 1,051 $ 2,220 $ 1,968 $ 799 $ 15 $ 799 $ 8,517 Loans: Individually evaluated for impairment $ 3,006 $ — $ 1,280 $ 4,093 $ — $ — $ 8,379 Collectively evaluated for impairment 199,324 76,122 164,712 201,320 57,236 530 699,244 Total loans $ 202,330 $ 76,122 $ 165,992 $ 205,413 $ 57,236 $ 530 $ 707,623 The following table summarizes the loans individually and collectively evaluated for impairment by loan segment at September 30, 2020: One to Loans to four Multi-family Commercial Construction and Commercial financial family residential residential real estate land development business institutions Leases Consumer Unallocated Total (Dollars in Thousands) Allowance for loan losses: Individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 1,877 460 1,989 2,888 194 89 3 6 797 8,303 Total ending allowance balance $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 Loans: Individually evaluated for impairment $ 3,095 $ — $ 1,417 $ 8,525 $ — $ — $ — $ — $ 13,037 Collectively evaluated for impairment 230,777 31,100 138,526 252,123 12,916 6,000 176 604 672,222 Total loans $ 233,872 $ 31,100 $ 139,943 $ 260,648 $ 12,916 $ 6,000 $ 176 $ 604 $ 685,259
Schedule of impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary	The following table presents impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary as of September 30, 2021: Impaired Loans with Impaired Loans with No Specific Specific Allowance Allowance Total Impaired Loans (Dollars in Thousands) Unpaid Recorded Related Recorded Recorded Principal Investment Allowance Investment Investment Balance One-to-four family residential $ — $ — $ 3,006 $ 3,006 $ 3,304 Commercial real estate — — 1,280 1,280 1,457 Construction and land development — — 4,093 4,093 4,340 Total $ — $ — $ 8,379 $ 8,379 $ 9,101 The following table presents impaired loans by class, segregated by those for which a specific allowance was required and those for which a specific allowance was not necessary as of September 30, 2020: Impaired Loans with Impaired Loans with No Specific Specific Allowance Allowance Total Impaired Loans (Dollars in Thousands) Unpaid Recorded Related Recorded Recorded Principal Investment Allowance Investment Investment Balance One-to-four family residential $ — $ — $ 3,095 $ 3,095 $ 3,482 Commercial real estate — — 1,417 1,417 1,600 Construction and land development — — 8,525 8,525 10,906 Total $ — $ — $ 13,037 $ 13,037 $ 15,988
Schedule of average investment in impaired loans and related interest income recognized	Year Ended September 30, 2021 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 3,212 $ 18 $ 13 Commercial real estate 1,336 — — Construction and land development 6,697 — — Total impaired loans $ 11,245 $ 18 $ 13 Year Ended September 30, 2020 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 3,825 $ 13 $ 26 Multi-family residential 56 — — Commercial real estate 1,549 — 1 Construction and land development 8,685 — — Commercial business 2 — — Consumer 24 — — Total impaired loans $ 14,141 $ 13 $ 27 Year Ended September 30, 2019 Average Income Recorded Income Recognized Recognized on Investment on Accrual Basis Cash Basis (Dollars in Thousands) One-to-four family residential $ 4,685 $ 77 $ 22 Multi-family residential 145 10 — Commercial real estate 2,139 36 4 Construction and land development 8,751 — — Total $ 15,720 $ 123 $ 26
Schedule of classes of the loan portfolio in which a formal risk weighting system is utilized	September 30, 2021 Special Pass Mention Substandard Doubtful Total (Dollars in Thousands) One-to-four residential $ 197,920 $ 1,404 $ 3,006 $ — $ 202,330 Multi-family residential 71,497 4,625 — — 76,122 Commercial real estate 162,657 2,055 1,280 — 165,992 Construction and land development 201,320 — 4,093 — 205,413 Loans to financial institutions — — — — — Commercial business 57,236 — — — 57,236 Total $ 690,630 $ 8,084 $ 8,379 $ — $ 707,093 September 30, 2020 Special Pass Mention Substandard Doubtful Total (Dollars in Thousands) One-to-four residential $ 229,361 $ 1,416 $ 3,095 $ — $ 233,872 Multi-family residential 31,100 — — — 31,100 Commercial real estate 128,527 9,999 1,417 — 139,943 Construction and land development 252,123 — 8,525 — 260,648 Loans to financial institutions 6,000 — — — 6,000 Commercial business 12,916 — — — 12,916 Total $ 660,027 $ 11,415 $ 13,037 $ — $ 684,479
Schedule of loans in which a formal risk rating system is not utilized, but loans are segregated between performing and non-performing based primarily on delinquency status	September 30, 2021 Non- Performing Performing Total (Dollars in Thousands) Consumer $ 530 $ — $ 530 September 30, 2020 Non- Performing Performing Total (Dollars in Thousands) Leases $ 176 $ — $ 176 Consumer 604 — 604 Total $ 780 $ — $ 780
Schedule of loan categories of the loan portfolio summarized by the aging categories of performing and delinquent loans and nonaccrual loans	September 30, 2021 90 Days+ 30 ‑ 89 Days 90 Days + Total Total Non- Past Due Current Past Due Past Due Past Due Loans Accrual and Accruing (Dollars in Thousands) One-to-four family residential $ 199,799 $ 487 $ 2,044 $ 2,531 $ 202,330 $ 3,006 $ — Multi-family residential 76,122 — — — 76,122 — — Commercial real estate 164,712 — 1,280 1,280 165,992 1,280 — Construction and land development 201,320 — 4,093 4,093 205,413 4,093 — Commercial business 57,236 — — — 57,236 — — Consumer 493 37 — 37 530 — — Total Loans $ 699,682 $ 524 $ 7,417 $ 7,941 $ 707,623 $ 8,379 $ — September 30, 2020 90 Days+ 30 ‑ 89 Days 90 Days + Total Total Non- Past Due Current Past Due Past Due Past Due Loans Accrual and Accruing (Dollars in Thousands) One-to-four family residential $ 231,196 $ 523 $ 2,153 $ 2,676 $ 233,872 $ 3,095 $ — Multi-family residential 31,100 — — — 31,100 — — Commercial real estate 136,225 2,301 1,417 3,718 139,943 1,417 — Construction and land development 252,123 — 8,525 8,525 260,648 8,525 — Commercial business 12,916 — — — 12,916 — — Loans to financial institutions 6,000 — — — 6,000 — — Leases 176 — — — 176 — Consumer 604 — — — 604 — — Total Loans $ 670,340 $ 2,824 $ 12,095 $ 14,919 $ 685,259 $ 13,037 $ —
Schedule of primary segments of the allowance for loan losses, segmented into the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment.	The following tables summarize the primary segments of the allowance for loan losses, segmented into the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of September 30, 2021, 2020 and 2019. Activity in the allowance is presented for the years ended September 30, 2021, 2020 and 2019: Year Ended September 30, 2021 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2020 $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 Charge-offs — — — (40) — — — — — (40) Recoveries 5 — — — 14 — — 35 — 54 Provision (217) 591 231 (880) 591 (89) (3) (26) 2 200 ALLL balance at September 30, 2021 $ 1,665 $ 1,051 $ 2,220 $ 1,968 $ 799 $ — $ — $ 15 $ 799 $ 8,517 Year Ended September 30, 2020 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2019 $ 1,002 $ 315 $ 1,257 $ 2,034 $ 206 $ 63 $ 5 $ 13 $ 498 $ 5,393 Charge-offs (3) — — — (15) — — (126) — (144) Recoveries 14 — — — — — 9 6 — 29 Provision 864 145 732 854 3 26 (11) 113 299 3,025 ALLL balance at September 30, 2020 $ 1,877 $ 460 $ 1,989 $ 2,888 $ 194 $ 89 $ 3 $ 6 $ 797 $ 8,303 September 30, 2019 One to Multi- Construction Loans to four family family Commercial and land Commercial financial residential residential real estate development business institutions Leases Consumer Unallocated Total (In Thousands) ALLL balance at September 30, 2018 $ 1,325 $ 347 $ 1,154 $ 1,554 $ 187 $ 64 $ 18 $ 17 $ 501 $ 5,167 Charge-offs (7) — — — — — (31) — — (38) Recoveries 164 — — — — — — — — 164 Provision (480) (32) 103 480 19 (1) 18 (4) (3) 100 ALLL balance at September 30, 2019 $ 1,002 $ 315 $ 1,257 $ 2,034 $ 206 $ 63 $ 5 $ 13 $ 498 $ 5,393

OFFICE PROPERTIES AND EQUIPME_2

OFFICE PROPERTIES AND EQUIPMENT (Tables)	12 Months Ended
OFFICE PROPERTIES AND EQUIPMENT (Tables)	Sep. 30, 2021
OFFICE PROPERTIES AND EQUIPMENT
Schedule of office properties and equipment	September 30, 2021 2020 (Dollars in Thousands) Land $ 1,437 $ 1,437 Buildings and improvements 7,449 7,449 Furniture and equipment 4,202 4,046 Total 13,088 12,932 Accumulated depreciation (6,238) (5,803) Total office properties and equipment, net of accumulated depreciation $ 6,850 $ 7,129

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
DEPOSITS (Tables)	Sep. 30, 2021
DEPOSITS [Abstract]
Schedule of major classifications of deposits	September 30, September 30, 2021 2020 Amount Percent Amount Percent (Dollars in Thousands) Non-interest-bearing checking accounts $ 37,409 5.3 % $ 30,002 3.9 % Interest-bearing checking accounts 87,752 12.3 135,797 17.6 Money market deposit accounts 111,488 15.7 111,105 14.4 Passbook, club and statement savings 229,989 32.3 224,435 29.1 Certificates maturing in six months or less 143,767 20.2 125,165 16.2 Certificates maturing in more than six months 101,110 14.2 144,445 18.8 Total $ 711,515 100.0 % $ 770,949 100.0 %
Schedule of maturities of certificate accounts	September 30, 2021 (Dollars in Thousands) One year or less $ 182,719 One through two years 33,547 Two through three years 19,700 Three through four years 6,073 Four through five years 2,838 Total $ 244,877
Schedule of interest expense on deposits	Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) Checking and money market deposit accounts $ 3,580 $ 2,045 $ 899 Passbook, club and statement savings accounts 10 38 124 Certificate accounts 4,687 8,819 12,137 Total $ 8,277 $ 10,902 $ 13,160

ADVANCES FROM FEDERAL HOME LO_3

ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM (Tables)	12 Months Ended
ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM (Tables)	Sep. 30, 2021
ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM
Schedule of short-term borrowings from the FHLB of Pittsburgh	The years ended September 30, 2021 and 2020 outstanding balances and related information regarding short-term borrowings from the FHLB of Pittsburgh are summarized follows: At or For the Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) FHLB advances: Average balance outstanding $ 9,932 $ 66,735 $ 31,158 Maximum amount outstanding at any month-end during the period 25,000 115,000 90,000 Balance outstanding at end of period — 25,000 90,000 Average interest rate during the period 0.39 % 1.58 % 2.53 % Weighted average interest rate at end of period — % 0.39 % 2.32 %

ADVANCES FROM FEDERAL HOME LO_4

ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM (Tables)	12 Months Ended
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM (Tables)	Sep. 30, 2021
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM
Schedule of collateral agreement with the FHLB	Lomg-term FHLB advances: Maturity range Weighted average Stated interest rate range Description from to interest rate from to 2021 2020 (Dollars in Thousands) Fixed Rate - Amortizing 1 ‑ Oct ‑ 20 30 ‑ Sep ‑ 21 2.77 % 1.94 % 2.83 % — 5,179 Fixed Rate - Amortizing 1 ‑ Oct ‑ 21 30 ‑ Sep ‑ 22 2.96 % 1.99 % 3.05 % 2,227 5,523 Fixed Rate - Amortizing 1 ‑ Oct ‑ 22 30 ‑ Sep ‑ 23 2.89 % 1.94 % 3.11 % 3,551 5,265 Total 2.92 % $ 5,778 $ 15,967 Fixed Rate - Advances 1 ‑ Oct ‑ 20 30 ‑ Sep ‑ 21 2.37 % 1.42 % 2.92 % — 17,996 Fixed Rate - Advances 1 ‑ Oct ‑ 21 30 ‑ Sep ‑ 22 2.31 % 1.94 % 3.23 % 63,250 63,293 Fixed Rate - Advances 1 ‑ Oct ‑ 22 30 ‑ Sep ‑ 23 2.52 % 2.00 % 3.22 % 94,999 94,999 Fixed Rate - Advances 1 ‑ Oct ‑ 23 30 ‑ Sep ‑ 24 2.88 % 2.38 % 3.20 % 67,998 67,998 Total 2.57 % $ 226,247 $ 244,286 2.58 % Total $ 232,025 $ 260,253
Schedule of advances from the FHLB of Pittsburgh with coupon rates	Weighted Average Maturity in Fiscal Amount Coupon Rate (Dollars in Thousands) 2022 $ 65,477 2.33 % 2023 98,550 2.54 2024 67,998 2.88 $ 232,025 2.58

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
INCOME TAXES (Tables)	Sep. 30, 2021
INCOME TAXES
Schedule of provision for income taxes	Year Ended September 30, 2021 2020 2019 (Dollars in Thousands) Current: Federal expense $ 564 $ 1,952 $ 2,133 State expense 28 93 205 Total current taxes 592 2,045 2,338 Deferred income tax expense (benefit) 677 (445) (188) Total income tax provision $ 1,269 $ 1,600 $ 2,150
Schedule of deferred income taxes	September 30, September 30, 2021 2020 (Dollars in Thousands) Deferred tax assets: Allowance for loan losses $ 1,716 $ 2,071 Nonaccrual interest 395 561 Accrued vacation 14 16 Capital loss carryforward 4 4 Split dollar life insurance 9 9 Post-retirement benefits 67 72 Realized loss on equity securities — 3 Unrealized losses on interest rate swaps 2,199 3,596 Deferred compensation 767 781 Goodwill 47 58 Lease liability 256 — Other 79 48 Employee benefit plans 242 187 Total deferred tax assets 5,795 7,406 Valuation allowance (4) (4) Total deferred tax assets, net of valuation allowance 5,791 7,402 Deferred tax liabilities: Property 127 137 Right of Use 233 — Realized gain on equity securities 3 — Unrealized gains on available for sale securities 1,621 2,813 Purchase accounting adjustments 394 321 Deferred loan fees 392 229 Total deferred tax liabilities 2,770 3,500 Net deferred tax assets $ 3,021 $ 3,902
Schedule of income tax expense computed at the statutory federal corporate tax rate	Year Ended September 30, 2021 2020 2019 Percentage Percentage Percentage of Pretax of Pretax of Pretax Amount Income Amount Income Amount Income (Loss) (Dollars in Thousands) Tax at statutory rate $ 1,900 21.0 % $ 2,343 21.0 % $ 2,453 21.0 % Adjustments resulting from: State tax expense 28 0.3 93 0.8 162 1.3 Tax exempt interest income (553) (6.1) (537) (4.8) (313) (2.7) Capital gain from sale of securities — — (117) (1.0) — — Earnings from bank owned life insurance (130) (1.4) (138) (1.2) (135) (1.1) Employee benefit plans 24 0.2 (27) (0.3) (27) (0.2) Other — — (17) (0.2) 10 0.1 Income tax expense $ 1,269 14.0 % $ 1,600 14.3 % $ 2,150 18.4 %

REGULATORY CAPITAL REQUIREMEN_2

REGULATORY CAPITAL REQUIREMENTS (Tables)	12 Months Ended
REGULATORY CAPITAL REQUIREMENTS (Tables)	Sep. 30, 2021
REGULATORY CAPITAL REQUIREMENTS
Schedule of Company's and the Bank's actual capital amounts and ratios	To Be Well Capitalized Under Prompt Required for Capital Corrective Action Actual Adequacy Purposes Provisions Amount Ratio Amount Ratio Amount Ratio (Dollars in Thousands) September 30, 2021: Tier 1 capital (to average assets) Company $ 126,281 11.48 % N/A N/A N/A N/A Bank 123,840 11.30 $ 43,855 4.0 % $ 54,819 5.0 % Tier 1 Common (to risk-weighted assets) Company 126,281 16.70 N/A N/A N/A N/A Bank 123,840 16.37 34,033 4.5 49,159 6.5 Tier 1 capital (to risk-weighted assets) Company 126,281 16.70 N/A N/A N/A N/A Bank 123,840 16.37 45,377 6.0 60,503 8.0 Total capital (to risk-weighted assets) Company 135,167 17.87 N/A N/A N/A N/A Bank 132,726 17.55 60,503 8.0 75,629 10.0 September 30, 2020: Tier 1 capital (to average assets) Company $ 125,618 10.34 % N/A N/A N/A N/A Bank 123,185 10.51 $ 46,867 4.0 % $ 58,584 5.0 % Tier 1 Common (to risk-weighted assets) Company 125,618 17.21 N/A N/A N/A N/A Bank 123,185 16.88 32,841 4.5 47,437 6.5 Tier 1 capital (to risk-weighted assets) Company 125,618 17.21 N/A N/A N/A N/A Bank 123,185 16.88 43,788 6.0 58,384 8.0 Total capital (to risk-weighted assets) Company 134,389 18.41 N/A N/A N/A N/A Bank 131,956 18.08 58,384 8.0 72,980 10.0

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	12 Months Ended
EMPLOYEE BENEFITS (Tables)	Sep. 30, 2021
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Schedule of multiemployer plans	Pentegra Defined Benefit Plan for Legal Name of Plan Financial Institutions Plan Employer Identification Number 13-5645888 The Company's Contribution for the year ended September 30, 2021 $ 780,000 Are Company's Contributions more than 5% of total contributions? No Funded Status 96.49 %
Schedule of summary of the non-vested stock award activity	Year Ended September 30, 2021 Number of Weighted Average Shares Grant Date Fair Value Non-vested stock awards at October 1, 2020 23,056 $ 17.78 Granted — — Forfeited — — Vested (11,085) 17.30 Non-vested stock awards at September 30, 2021 11,971 $ 18.24
Stock Options
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Schedule of summary of the status of the company' stock options under the stock option plan	Year Ended September 30, 2021 Number of Weighted Average Shares Exercise Price Options outstanding at October 1, 2020 571,258 $ 14.58 Granted 4,500 13.86 Exercised (15,000) 12.23 Forfeited (39,500) 18.42 Outstanding at September 30, 2021 521,258 $ 14.23 Exercisable at September 30, 2021 418,471 $ 13.74

INTEREST RATE SWAP AGREEMENTS (

INTEREST RATE SWAP AGREEMENTS (Tables)	12 Months Ended
INTEREST RATE SWAP AGREEMENTS (Tables)	Sep. 30, 2021
INTEREST RATE SWAPS
Schedule of interest rate swap agreements	2021 Hedged Notional Pay Rate Receive Maturity Date Unrealized Item Amount from to Rate from to Loss (Dollars in thousands) State and political subdivisions $ 21,570 3.06 % 3.07 % 3 Mth Libor 1-Feb-27 1-May-28 $ (2,365) Commercial loans 23,656 4.10 % 5.74 % 1 Mth Libor +225 to 276 bp 13-Jun-25 1-Aug-26 — 30 day wholesale funding 90,000 1.36 % 2.70 % 1 Mth Libor 15-Feb-24 12-Jun-26 (3,495) 90 day wholesale funding 135,000 2.51 % 2.78 % 3 Mth Libor 11-Jan-24 27-Mar-24 (6,974) $ (12,834) 2020 Hedged Notional Pay Rate Receive Maturity Date Unrealized Item Amount from to Rate from to Loss (Dollars in t housands) State and political subdivisions $ 21,570 3.06 % 3.07 % 3 Mth Libor 1-Feb-27 1-May-28 $ (3,834) Commercial loans 23,656 4.10 % 5.74 % 1 Mth Libor +225 to 276 bp 13-Jun-25 1-Aug-26 — 30 day wholesale funding 90,000 1.36 % 2.70 % 1 Mth Libor 15-Feb-24 12-Jun-26 (6,157) 90 day wholesale funding 135,000 2.51 % 2.78 % 3 Mth Libor 11-Jan-24 27-Mar-24 (10,969) $ (20,960)

FAIR VALUE MEASUREMENT (Tables)

FAIR VALUE MEASUREMENT (Tables)	12 Months Ended
FAIR VALUE MEASUREMENT (Tables)	Sep. 30, 2021
FAIR VALUE MEASUREMENT
Schedule of assets measured at fair value on recurring basis	Those assets as of September 30, 2021 which are measured at fair value on a recurring basis are as follows: Category Used for Fair Value Measurement Level 1 Level 2 Level 3 Total (Dollars in Thousands) Assets: Securities available for sale: U.S. Government and agency obligations $ — $ 3,194 $ — $ 3,194 State and political subdivisions — 72,259 — 72,259 Mortgage-backed securities - U.S. Government agencies — 135,353 — 135,353 Corporate bonds — 95,141 — 95,141 Equity security - FHLMC preferred stock 22 — — 22 Total $ 22 $ 305,947 $ — $ 305,969 Liabilities: Interest rate swap contracts $ — $ 12,834 $ — $ 12,834 Total $ — $ 12,834 $ — $ 12,834 Those assets as of September 30, 2020 which are measured at fair value on a recurring basis are as follows: Category Used for Fair Value Measurement Level 1 Level 2 Level 3 Total (Dollars in Thousands) Assets: Securities available for sale: U.S. Government and agency obligations $ — $ 22,394 $ — $ 22,394 State and political subdivisions — 79,621 — 79,621 Mortgage-backed securities - U.S. Government agencies — 236,566 — 236,566 Corporate bonds — 81,783 — 81,783 Equity security - FHLMC preferred stock 51 — — 51 Total $ 51 $ 420,364 $ — $ 420,415 Liabilities: Interest rate swap contracts $ — $ 20,960 $ — $ 20,960 Total $ — $ 20,960 $ — $ 20,960
Schedule of summary of non-recurring fair value measurements	Summary of Non-Recurring Fair Value Measurements At September 30, 2021 (Dollars in Thousands) Level 1 Level 2 Level 3 Total Other real estate owned $ — $ — $ 4,109 $ 4,109 Total $ — $ — $ 4,109 $ 4,109
Schedule of nonrecurring fair value measurements categorized within level 3 of the fair value hierarchy	The following table provides information describing the valuation process used to determine nonrecurring fair value measurements categorized within level 3 of the fair value hierarchy: At September 30, 2021 (Dollars in Thousands) Valuation Range/ Fair Value Technique Unobservable Input Weighted Ave. Other real estate owned $ 4,109 Property appraisals (1) (3) Management discount for selling costs, property type and market volatility (2) 2% discount (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally includes various level 3 inputs, which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal. (3) Includes qualitative adjustments by management and estimated liquidation expenses.
Schedule of the estimated fair value amounts	Fair Value Measurements at Carrying Fair September 30, 2021 Amount Value (Level 1) (Level 2) (Level 3) (Dollars in Thousands) Assets: Investment and mortgage-backed securities held to maturity $ 20,074 $ 21,161 $ — $ 21,161 $ — Loans receivable, net 618,206 620,017 — — 620,017 Liabilities: Certificates of deposit 244,877 252,510 — — 252,510 Advances from FHLB -long-term 232,025 239,301 — — 239,301 Fair Value Measurements at Carrying Fair September 30, 2020 Amount Value (Level 1) (Level 2) (Level 3) (Dollars in Thousands) Assets: Investment and mortgage-backed securities held to maturity $ 22,860 $ 24,330 $ — $ 24,330 $ — Loans receivable, net 588,300 593,768 — — 593,768 Liabilities: Certificates of deposit 269,610 278,224 — — 278,224 Advances from FHLB -long-term 260,253 274,172 — — 274,172

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	12 Months Ended
GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	Sep. 30, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS
Schedule of goodwill and intangible assets are related to the acquisition of Polonia Bancorp	Balance Balance October 1, Additions/ September 30, Amortization 2020 Adjustments Amortization 2021 Period (Dollars in Thousands) Goodwill $ 6,102 $ — $ — $ 6,102 Core deposit intangible 340 — (94) 246 10 years $ 6,442 $ — $ (94) $ 6,348
Schedule of future fiscal periods amortization expense for core deposit intangible	(Dollars In Thousands) 2022 $ 78 2023 64 2024 49 2025 34 2026 18 Thereafter 3 $ 246

LEASES (Tables)

LEASES (Tables)	12 Months Ended
LEASES (Tables)	Sep. 30, 2021
LEASES [Abstract]
Schedule of information related to operating leases	The following table summarizes other information related to our operating leases: September 30, 2021 Weighted-average remaining lease term - operating leases in years 6.25 Weighted-average discount rate - operating leases 2.0 %
Schedule of aggregate lease maturities and obligations	The following table presents aggregate lease (Dollars in Thousands) 2022 $ 213 2023 216 2024 220 2025 231 2026 126 2027 and thereafter 291 Total lease payments 1,297 Less: interest 77 Present value of lease liabilities $ 1,220

PRUDENTIAL BANCORP, INC. (PAR_2

PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) (Tables)	12 Months Ended
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) (Tables)	Sep. 30, 2021
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)
Schedule of statement of financial condition	STATEMENT OF FINANCIAL CONDITION September 30, 2021 2020 (Dollars in Thousands) Assets: Cash $ 854 $ 955 Investment in Bank 128,014 126,684 Other assets 1,588 1,478 Total assets $ 130,456 $ 129,117 Stockholders' equity: Preferred stock $ — $ — Common stock 108 108 Additional paid-in-capital 118,424 118,270 Treasury stock (44,351) (39,207) Retained earnings 58,450 52,889 Accumulated other comprehensive loss (2,175) (2,943) Total stockholders' equity $ 130,456 $ 129,117
Schedule of income statement	STATEMENT OF OPERATIONS 2021 2020 2019 (Dollars in Thousands) Equity in the earnings of the Bank $ 8,221 $ 9,959 $ 9,954 Total income 8,221 9,959 9,954 Professional services 180 168 168 Other expense 378 344 369 Total expense 558 512 537 Income before income taxes 7,663 9,447 9,417 Income tax benefit (117) (108) (113) Net income $ 7,780 $ 9,555 $ 9,530
Schedule of cash flows	CASH FLOWS 2021 2020 2019 (Dollars in Thousands) Operating activities: Net income $ 7,780 $ 9,555 $ 9,530 Other, net (50) 52 (115) Equity in the undistributed earnings of the Bank (8,221) (9,959) (9,954) Net cash used in operating activities (491) (352) (539) Financing activities: Purchase of treasury stock (5,391) (10,481) (3,108) Cash dividends paid (2,219) (6,216) (5,784) Dividends from the Bank 8,000 17,000 5,000 Net cash provided by (used in) financing activities 390 303 (3,892) Net decrease in cash and cash equivalents (101) (49) (4,431) Cash and cash equivalents, beginning of year 955 1,004 5,435 Cash and cash equivalents, end of year $ 854 $ 955 $ 1,004

CONSOLIDATED QUARTERLY FINANC_2

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	Sep. 30, 2021
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)
Schedule of unaudited quarterly financial information	September 30, 2021 September 30, 2020 1st 2nd 3rd 4th 1st 2nd 3rd 4th Qtr Qtr Qtr Qtr Qtr Qtr Qtr Qtr (Dollars in Thousands, Except Per Share Data) Interest income $ 9,689 $ 9,464 $ 9,339 $ 9,544 $ 11,827 $ 11,010 $ 9,791 $ 9,599 Interest expense 4,006 3,740 3,566 3,486 5,484 5,222 4,486 4,233 Net interest income 5,683 5,724 5,773 6,058 6,343 5,788 5,305 5,366 Provision for loan losses — — — 200 125 500 750 1,650 Net interest income after provision for loan losses 5,683 5,724 5,773 5,858 6,218 5,288 4,555 3,716 Non-interest income 537 575 1,395 1,132 832 2,668 3,762 841 Non-interest expense 4,097 4,350 4,543 4,638 4,021 4,460 3,996 4,248 Income before income tax expense (benefit) 2,123 1,949 2,625 2,352 3,029 3,496 4,321 309 Income tax expense (benefit) 286 235 387 361 566 572 701 (239) Net income $ 1,837 $ 1,714 $ 2,238 $ 1,991 $ 2,463 $ 2,924 $ 3,620 $ 548 Per share: Earnings per share - basic $ 0.23 $ 0.22 $ 0.28 $ 0.25 $ 0.28 $ 0.33 $ 0.44 $ 0.07 Earnings per share - diluted $ 0.23 $ 0.22 $ 0.28 $ 0.25 $ 0.28 $ 0.32 $ 0.44 $ 0.07 Dividends per share $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.50 $ 0.07 $ 0.07 September 30, 2019 1st 2nd 3rd 4th Qtr Qtr Qtr Qtr (Dollars in Thousands, Except Per Share Data) Interest income $ 10,002 $ 11,134 $ 11,273 $ 11,631 Interest expense 3,986 4,811 5,058 5,434 Net interest income 6,016 6,323 6,215 6,197 Provision for loan losses — — — 100 Net interest income after provision for loan losses 6,016 6,323 6,215 6,097 Non-interest income 380 542 1,187 985 Non-interest expense 4,033 4,146 4,190 3,696 Income before income tax expense 2,363 2,719 3,212 3,386 Income tax expense 389 380 582 799 Net income $ 1,974 $ 2,339 $ 2,630 $ 2,587 Per share: Earnings per share - basic $ 0.22 $ 0.27 $ 0.30 $ 0.30 Earnings per share - diluted $ 0.22 $ 0.26 $ 0.29 $ 0.29 Dividends per share $ 0.05 $ 0.05 $ 0.50 $ 0.05

NATURE OF OPERATIONS AND BASI_2

NATURE OF OPERATIONS AND BASIS OF PRESENTATION (Details) $ in Thousands	Sep. 30, 2021USD ($)item	Sep. 30, 2020USD ($)
Nature Of Operations And Basis Of Presentation [Line Items]
Assets	$ 1,100,468	$ 1,223,353
Company
Nature Of Operations And Basis Of Presentation [Line Items]
Number of full service branch offices \| item	10
PSB Delaware, Inc. ("PSB")
Nature Of Operations And Basis Of Presentation [Line Items]
Assets	$ 275,500

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Significant Accounting Policies [Line Items]
FDIC insured amount	$ 249,000
Par value of stock bought from and sold to the federal home loan bank (in dollars per share)	$ 100
Purchase of stock in ACBB to support line of credit				$ 90,000
Line of credit				$ 12,500,000
Dividend payable	$ 0	$ 0
Cash dividend paid	$ 2,200,000	$ 6,200,000	$ 5,800,000
Common stock repurchased	386,883
Average price per share of common stock	$ 13.93
Percent of cumulatively total revenue	91.30%
Office Properties
Significant Accounting Policies [Line Items]
Estimated useful life	10-39 years
Furniture and equipment
Significant Accounting Policies [Line Items]
Estimated useful life	1-7 years
Minimum
Significant Accounting Policies [Line Items]
Period for certificates of deposit issued by FDIC insured banks	1 year
Maximum
Significant Accounting Policies [Line Items]
Period for certificates of deposit issued by FDIC insured banks	5 years

EARNINGS PER SHARE - Calculated

EARNINGS PER SHARE - Calculated basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Earnings per share - basic
Net income	$ 1,991	$ 2,238	$ 1,714	$ 1,837	$ 548	$ 3,620	$ 2,924	$ 2,463	$ 2,587	$ 2,630	$ 2,339	$ 1,974	$ 7,780	$ 9,555	$ 9,530
Weighted average common shares outstanding - basic													7,935,143	8,538,006	8,777,794
Effect of CSEs - basic													0	0	0
Adjusted weighted average common shares used in earnings per share computation - basic													7,935,143	8,538,006	8,777,794
Earnings per share - basic (in dollars per share)	$ 0.25	$ 0.28	$ 0.22	$ 0.23	$ 0.07	$ 0.44	$ 0.33	$ 0.28	$ 0.30	$ 0.30	$ 0.27	$ 0.22	$ 0.98	$ 1.12	$ 1.09
Earnings per share - diluted
Net income	$ 1,991	$ 2,238	$ 1,714	$ 1,837	$ 548	$ 3,620	$ 2,924	$ 2,463	$ 2,587	$ 2,630	$ 2,339	$ 1,974	$ 7,780	$ 9,555	$ 9,530
Weighted average shares outstanding - diluted													7,935,143	8,538,006	8,777,794
Effect of CSEs - diluted													17,794	24,470	158,083
Adjusted weighted average shares used in earnings per share computation - diluted													7,952,937	8,562,476	8,935,877
Earnings per share - diluted (in dollars per share)	$ 0.25	$ 0.28	$ 0.22	$ 0.23	$ 0.07	$ 0.44	$ 0.32	$ 0.28	$ 0.29	$ 0.29	$ 0.26	$ 0.22	$ 0.98	$ 1.12	$ 1.07

EARNINGS PER SHARE - Additional

EARNINGS PER SHARE - Additional Information (Details) - shares	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
EARNINGS PER SHARE
Adjusted weighted average shares of common stock used in diluted earnings per share computation	267,728	282,728	550,833
Adjusted weighted average shares of common stock having exercise prices less than the current market value and are considered anti-dilutive	253,530	288,530	242,201

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in accumulated other comprehensive (loss) income by component net of tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ (2,943)
Total other comprehensive (loss) gain	768	$ (4,135)	$ 9,371
Ending Balance	(2,175)	(2,943)
Total accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,943)	1,192	(8,154)
Other comprehensive (loss) income before reclassification	2,067	599	10,206
Amount reclassified from accumulated other comprehensive income	(1,299)	(4,734)	(835)
Reclassification for net gains recorded in net income			(25)
Ending Balance	(2,175)	(2,943)	1,192
Unrealized gain (loss) on AFS securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	10,585	8,098	(8,320)
Other comprehensive (loss) income before reclassification	(3,188)	7,221	17,278
Amount reclassified from accumulated other comprehensive income	(1,299)	(4,734)	(835)
Reclassification for net gains recorded in net income			(25)
Ending Balance	6,098	10,585	8,098
Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(13,528)	(6,906)	166
Other comprehensive (loss) income before reclassification	5,255	(6,622)	(7,072)
Amount reclassified from accumulated other comprehensive income	0	0
Ending Balance	$ (8,273)	$ (13,528)	$ (6,906)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Significant amounts reclassified out of each component of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Unrealized gains on available for sale securities
Unrealized gain (losses)	$ 1,644	$ 5,993	$ 1,057
Amount reclassified from accumulated other comprehensive (loss) income
Unrealized gains on available for sale securities
Unrealized gain (losses)	1,644	5,993	1,057
Income taxes	(345)	(1,259)	(222)
Total	1,299	4,734	835
Unrealized gain (loss) on AFS securities
Unrealized gains on available for sale securities
Total	(1,299)	(4,734)	(835)
Unrealized gain (loss) on AFS securities \| Amount reclassified from accumulated other comprehensive (loss) income
Unrealized gains on available for sale securities
Unrealized gain (losses)	1,644	5,993	1,057
Income taxes	(345)	(1,259)	(222)
Total	1,299	4,734	$ 835
Swaps
Unrealized gains on available for sale securities
Total	0	0
Swaps \| Amount reclassified from accumulated other comprehensive (loss) income
Unrealized gains on available for sale securities
Unrealized gain (losses)	0	0
Income taxes	0	0
Total	$ 0	$ 0

INVESTMENT AND MORTGAGE-BACKE_3

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Amortized cost and fair value of investment and mortgage-backed securities, with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Securities Available for Sale:
Fair Value	$ 305,947	$ 420,364
U.S. Government and agency obligations
Securities Available for Sale:
Amortized Cost	3,117	22,241
Gross Unrealized Gains	77	153
Gross Unrealized Losses		0
Fair Value	3,194	22,394
State and political subdivisions
Securities Available for Sale:
Amortized Cost	70,625	79,099
Gross Unrealized Gains	1,793	1,940
Gross Unrealized Losses	(159)	(1,418)
Fair Value	72,259	79,621
Mortgage-Backed Securities
Securities Available for Sale:
Amortized Cost	131,842	226,863
Gross Unrealized Gains	4,267	9,774
Gross Unrealized Losses	(756)	(71)
Fair Value	135,353	236,566
Corporate debt securities
Securities Available for Sale:
Amortized Cost	92,645	78,764
Gross Unrealized Gains	2,683	3,564
Gross Unrealized Losses	(187)	(545)
Fair Value	95,141	81,783
Total debt securities available for sale
Securities Available for Sale:
Amortized Cost	298,229	406,967
Gross Unrealized Gains	8,820	15,431
Gross Unrealized Losses	(1,102)	(2,034)
Fair Value	$ 305,947	$ 420,364

INVESTMENT AND MORTGAGE-BACKE_4

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Amortized cost and fair value of investment and mortgage-backed securities, with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Securities Held to Maturity:
Amortized Cost	$ 20,074	$ 22,860
Gross Unrealized Gains	1,111	1,470
Gross unrealized losses	(24)
Fair value	21,161	24,330
U.S. Government and agency obligations
Securities Held to Maturity:
Amortized Cost	1,000	1,000
Gross Unrealized Gains	173	236
Fair value	1,173	1,236
Mortgage-Backed Securities
Securities Held to Maturity:
Amortized Cost	4,091	3,784
Gross Unrealized Gains	211	309
Gross unrealized losses	(24)
Fair value	4,278	4,093
State and political subdivisions
Securities Held to Maturity:
Amortized Cost	14,983	18,076
Gross Unrealized Gains	727	925
Fair value	$ 15,710	$ 19,001

INVESTMENT AND MORTGAGE-BACKE_5

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Gross unrealized losses and related fair values of investment securities, aggregated by investment category and length of time (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Securities Available for Sale:
Less than 12 months - Gross Unrealized Losses	$ (767,000)	$ (737,000)
Less than 12 months - Fair value	57,692,000	37,232,000
More than 12 months - Gross Unrealized Losses	(335,000)	(1,297,000)
More than 12 months - Fair value	12,266,000	25,094,000
Total - Gross Unrealized Losses	(1,102,000)	(2,034,000)
Total - Fair Value	69,958,000	62,326,000
U.S. Government and agency obligations
Securities Available for Sale:
Total - Gross Unrealized Losses	(780,000)
State and political subdivisions
Securities Available for Sale:
Less than 12 months - Gross Unrealized Losses	(93,000)	(126,000)
Less than 12 months - Fair value	14,383,000	10,735,000
More than 12 months - Gross Unrealized Losses	(66,000)	(1,292,000)
More than 12 months - Fair value	4,417,000	24,510,000
Total - Gross Unrealized Losses	(159,000)	(1,418,000)
Total - Fair Value	18,800,000	35,245,000
Mortgage-Backed Securities
Securities Available for Sale:
Less than 12 months - Gross Unrealized Losses	(487,000)	(66,000)
Less than 12 months - Fair value	18,493,000	10,025,000
More than 12 months - Gross Unrealized Losses	(269,000)	(5,000)
More than 12 months - Fair value	7,849,000	584,000
Total - Gross Unrealized Losses	(756,000)	(71,000)
Total - Fair Value	26,342,000	10,609,000
Corporate debt securities
Securities Available for Sale:
Less than 12 months - Gross Unrealized Losses	(187,000)	(545,000)
Less than 12 months - Fair value	24,816,000	16,472,000
Total - Gross Unrealized Losses	(187,000)	(545,000)
Total - Fair Value	$ 24,816,000	$ 16,472,000

INVESTMENT AND MORTGAGE-BACKE_6

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Gross unrealized losses and related fair values of investment securities, aggregated by investment category and length of time (Details) $ in Thousands	Sep. 30, 2021USD ($)
Securities Held to Maturity:
Less than 12 months - Gross Unrealized Losses	$ (24)
Less than 12 Months, Fair Value	1,269
Total - Gross Unrealized Losses	(24)
Total - Fair Value	1,269
Mortgage-Backed Securities
Securities Held to Maturity:
Less than 12 months - Gross Unrealized Losses	(24)
Less than 12 Months, Fair Value	1,269
Total - Gross Unrealized Losses	(24)
Total - Fair Value	$ 1,269

INVESTMENT AND MORTGAGE-BACKE_7

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Gross unrealized losses and related fair values of investment securities, aggregated by investment category and length of time (Details) $ in Thousands	Sep. 30, 2021USD ($)
INVESTMENT AND MORTGAGE-BACKED SECURITIES
Less than 12 months - Gross Unrealized Losses	$ (791)
Less than 12 Months - Fair Value	58,961
More than 12 months - Gross Unrealized Losses	(335)
More than 12 Months - Fair Value	12,266
Total - Gross Unrealized Losses	(1,126)
Total - Fair Value	$ 71,227

INVESTMENT AND MORTGAGE-BACKE_8

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Amortized cost and fair value of debt securities, by contractual maturity (Details) $ in Thousands	Sep. 30, 2021USD ($)
Available for Sale, Amortized Cost
Due after one through five years	$ 40,137
Due after five through ten years	54,223
Due after ten years	72,027
Total	166,387
Available for Sale, Fair Value
Due after one through five years	41,330
Due after five through ten years	55,628
Due after ten years	73,636
Total	$ 170,594

INVESTMENT AND MORTGAGE-BACKE_9

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Amortized cost and fair value of debt securities, by contractual maturity (Details) $ in Thousands	Sep. 30, 2021USD ($)
Held to Maturity - Amortized Cost
Due within one year	$ 1,035
Due after one through five years	4,444
Due after five through ten years	6,465
Due after ten years	4,039
Total	15,983
Held to Maturity - Fair Value
Due within one year	1,049
Due after one through five years	4,792
Due after five through ten years	6,730
Due after ten years	4,312
Total	$ 16,883

INVESTMENT AND MORTGAGE-BACK_10

INVESTMENT AND MORTGAGE-BACKED SECURITIES - Additional Information (Details)	12 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Marketable Securities [Line Items]
Gain on sale of mortgage-backed securities available for sale	$ 1,644,000	$ 5,993,000	$ 1,057,000
Securities with a fair value in safekeeping account at the FHLB	106,800,000
Aggregate Amount	767,000	737,000
Gross realized gains on investments and mortgage-backed securities	1,600,000	6,100,000	1,300,000
Gross realized losses on investments and mortgage-backed securities	0	68,000	280,000
Gain (loss) on equity securities	(29,000)	44,000	58,000
Proceeds from sale of investment and mortgage-backed securities	26,059,000	142,055,000	75,639,000
Required to hold securities for its borrowings	94,200,000
Excess securities not restricted and could be sold or transferred	12,600,000
Gross unrealized loss	1,102,000	2,034,000
OTTI	$ 0	0	$ 0
U.S. Government and agency obligations
Marketable Securities [Line Items]
Number of debt securities \| security	0
Gross unrealized loss	$ 780,000
Mortgage-Backed Securities
Marketable Securities [Line Items]
Number of debt securities \| security	15
Percentage of reduction in amortized cost of debt securities	0.50%
Aggregate Amount	$ 487,000	66,000
Gross unrealized loss	$ 756,000	71,000
Corporate debt securities
Marketable Securities [Line Items]
Number of debt securities \| security	7
Percentage of reduction in amortized cost of debt securities	0.20%
Aggregate Amount	$ 187,000	545,000
Gross unrealized loss	$ 187,000	545,000
State and political subdivisions
Marketable Securities [Line Items]
Number of debt securities \| security	7
Percentage of reduction in amortized cost of debt securities	0.10%
Aggregate Amount	$ 93,000	126,000
Gross unrealized loss	$ 159,000	$ 1,418,000

LOANS RECEIVABLE (Details)

LOANS RECEIVABLE (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 707,623	$ 685,259
Undisbursed portion of loans-in-process	(80,620)	(86,862)
Deferred loan fees	(280)	(1,794)
Allowance for loan losses	(8,517)	(8,303)	$ (5,393)	$ (5,167)
Net loans	618,206	588,300
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	202,330	233,872
Allowance for loan losses	(1,665)	(1,877)	(1,002)	(1,325)
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	76,122	31,100
Allowance for loan losses	(1,051)	(460)	(315)	(347)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	165,992	139,943
Allowance for loan losses	(2,220)	(1,989)	(1,257)	(1,154)
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	205,413	260,648
Allowance for loan losses	(1,968)	(2,888)	(2,034)	(1,554)
Loan to financial institutions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		6,000
Allowance for loan losses		(89)	(63)	(64)
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	57,236	12,916
Allowance for loan losses	(799)	(194)	(206)	(187)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		176
Allowance for loan losses		(3)	(5)	(18)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	530	604
Allowance for loan losses	$ (15)	$ (6)	$ (13)	$ (17)

LOANS RECEIVABLE - Summary of l

LOANS RECEIVABLE - Summary of loans individually and collectively evaluated for impairment by loan segment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Loans:
Individually evaluated for impairment	$ 8,379	$ 13,037
Collectively evaluated for impairment	699,244	672,222
Total loans	707,623	685,259
Individually evaluated for impairment	0
Collectively evaluated for impairment	8,517	8,303
Total ending allowance balance	8,517	8,303	$ 5,393	$ 5,167
One-to-four family residential
Loans:
Individually evaluated for impairment	3,006	3,095
Collectively evaluated for impairment	199,324	230,777
Total loans	202,330	233,872
Collectively evaluated for impairment	1,665	1,877
Total ending allowance balance	1,665	1,877	1,002	1,325
Multi-family residential
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	76,122	31,100
Total loans	76,122	31,100
Individually evaluated for impairment	0
Collectively evaluated for impairment	1,051	460
Total ending allowance balance	1,051	460	315	347
Commercial real estate
Loans:
Individually evaluated for impairment	1,280	1,417
Collectively evaluated for impairment	164,712	138,526
Total loans	165,992	139,943
Collectively evaluated for impairment	2,220	1,989
Total ending allowance balance	2,220	1,989	1,257	1,154
Construction and land development
Loans:
Individually evaluated for impairment	4,093	8,525
Collectively evaluated for impairment	201,320	252,123
Total loans	205,413	260,648
Collectively evaluated for impairment	1,968	2,888
Total ending allowance balance	1,968	2,888	2,034	1,554
Loan to financial institutions
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		6,000
Total loans		6,000
Individually evaluated for impairment		0
Collectively evaluated for impairment		89
Total ending allowance balance		89	63	64
Commercial business
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment	57,236	12,916
Total loans	57,236	12,916
Collectively evaluated for impairment	799	194
Total ending allowance balance	799	194	206	187
Leases
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		176
Total loans		176
Individually evaluated for impairment		0
Collectively evaluated for impairment		3
Total ending allowance balance		3	5	18
Consumer
Loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	530	604
Total loans	530	604
Individually evaluated for impairment	0
Collectively evaluated for impairment	15	6
Total ending allowance balance	15	6	13	17
Unallocated
Loans:
Individually evaluated for impairment	0
Collectively evaluated for impairment	799	797
Total ending allowance balance	$ 799	$ 797	$ 498	$ 501

LOANS RECEIVABLE - Impaired loa

LOANS RECEIVABLE - Impaired loans by class, segregated by those for which specific allowance was required and those for which specific allowance was not necessary (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Impaired [Line Items]
Impaired Loans with Specific Allowance - Recorded Investment	$ 0	$ 0
Impaired Loans with Specific Allowance - Related Allowance	0	0
Impaired Loans with No Specific Allowance - Recorded Investment	8,379	13,037
Total Impaired Loans - Recorded Investment	8,379	13,037
Total impaired loans - Unpaid Principal Balance	9,101	15,988
One-to-four family residential
Financing Receivable, Impaired [Line Items]
Impaired Loans with Specific Allowance - Recorded Investment	0	0
Impaired Loans with Specific Allowance - Related Allowance	0	0
Impaired Loans with No Specific Allowance - Recorded Investment	3,006	3,095
Total Impaired Loans - Recorded Investment	3,006	3,095
Total impaired loans - Unpaid Principal Balance	3,304	3,482
Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Loans with Specific Allowance - Recorded Investment	0	0
Impaired Loans with Specific Allowance - Related Allowance	0	0
Impaired Loans with No Specific Allowance - Recorded Investment	1,280	1,417
Total Impaired Loans - Recorded Investment	1,280	1,417
Total impaired loans - Unpaid Principal Balance	1,457	1,600
Construction and land development
Financing Receivable, Impaired [Line Items]
Impaired Loans with Specific Allowance - Recorded Investment	0	0
Impaired Loans with Specific Allowance - Related Allowance	0	0
Impaired Loans with No Specific Allowance - Recorded Investment	4,093	8,525
Total Impaired Loans - Recorded Investment	4,093	8,525
Total impaired loans - Unpaid Principal Balance	$ 4,340	$ 10,906

LOANS RECEIVABLE - Average reco

LOANS RECEIVABLE - Average recorded investment in impaired loans and related interest income recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 11,245	$ 14,141	$ 15,720
Income Recognized on Accrual Basis	18	13	123
Income Recognized on Cash Basis	13	27	26
One-to-four family residential
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,212	3,825	4,685
Income Recognized on Accrual Basis	18	13	77
Income Recognized on Cash Basis	13	26	22
Multi-family residential
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		56	145
Income Recognized on Accrual Basis			10
Income Recognized on Cash Basis			0
Commercial real estate
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,336	1,549	2,139
Income Recognized on Accrual Basis	0		36
Income Recognized on Cash Basis	0	1	4
Construction and land development
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,697	8,685	8,751
Income Recognized on Accrual Basis	0		0
Income Recognized on Cash Basis	$ 0		$ 0
Commercial business
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		2
Consumer
Financing Receivable, Impaired [Line Items]
Average Recorded Investment		$ 24

LOANS RECEIVABLE - Summary of c

LOANS RECEIVABLE - Summary of classes of loan portfolio in which formal risk weighting system is utilized (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 707,623	$ 685,259
One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	202,330	233,872
Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	76,122	31,100
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	165,992	139,943
Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	205,413	260,648
Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans		6,000
Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	57,236	12,916
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	530	604
Risk Rating System
Financing Receivable, Recorded Investment [Line Items]
Total Loans	707,093	684,479
Risk Rating System \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	202,330	233,872
Risk Rating System \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	76,122	31,100
Risk Rating System \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	165,992	139,943
Risk Rating System \| Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	205,413	260,648
Risk Rating System \| Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans		6,000
Risk Rating System \| Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	57,236	12,916
Risk Rating System \| Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	690,630	660,027
Risk Rating System \| Pass \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	197,920	229,361
Risk Rating System \| Pass \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	71,497	31,100
Risk Rating System \| Pass \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	162,657	128,527
Risk Rating System \| Pass \| Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	201,320	252,123
Risk Rating System \| Pass \| Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans		6,000
Risk Rating System \| Pass \| Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	57,236	12,916
Risk Rating System \| Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,084	11,415
Risk Rating System \| Special Mention \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,404	1,416
Risk Rating System \| Special Mention \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,625	0
Risk Rating System \| Special Mention \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,055	9,999
Risk Rating System \| Special Mention \| Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Special Mention \| Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Special Mention \| Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,379	13,037
Risk Rating System \| Substandard \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,006	3,095
Risk Rating System \| Substandard \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Substandard \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,280	1,417
Risk Rating System \| Substandard \| Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,093	8,525
Risk Rating System \| Substandard \| Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Substandard \| Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| Multi-family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| Loan to financial institutions
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Risk Rating System \| Doubtful \| Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

LOANS RECEIVABLE - Loans in whi

LOANS RECEIVABLE - Loans in which formal risk rating system is not utilized, but loans are segregated between performing and non-performing based primarily on delinquency status (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 707,623	$ 685,259
One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	202,330	233,872
Leases
Financing Receivable, Recorded Investment [Line Items]
Total Loans		176
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	530	604
Non Risk Rating System
Financing Receivable, Recorded Investment [Line Items]
Total Loans		780
Non Risk Rating System \| Leases
Financing Receivable, Recorded Investment [Line Items]
Total Loans		176
Non Risk Rating System \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	530	604
Non Risk Rating System \| Performing
Financing Receivable, Recorded Investment [Line Items]
Total Loans		780
Non Risk Rating System \| Performing \| Leases
Financing Receivable, Recorded Investment [Line Items]
Total Loans		176
Non Risk Rating System \| Performing \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	530	604
Non Risk Rating System \| Non-performing assets
Financing Receivable, Recorded Investment [Line Items]
Total Loans		0
Non Risk Rating System \| Non-performing assets \| Leases
Financing Receivable, Recorded Investment [Line Items]
Total Loans		0
Non Risk Rating System \| Non-performing assets \| Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

LOANS RECEIVABLE - Loan categor

LOANS RECEIVABLE - Loan categories of loan portfolio summarized by aging categories of performing loans and nonaccrual loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 699,682	$ 670,340
Past Due	7,941	14,919
Total Loans	707,623	685,259
Non- Accrual	8,379	13,037
90 Days+ Past Due and Accruing	0	0
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	524	2,824
Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,417	12,095
One-to-four family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	199,799	231,196
Past Due	2,531	2,676
Total Loans	202,330	233,872
Non- Accrual	3,006	3,095
90 Days+ Past Due and Accruing	0	0
One-to-four family residential \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	487	523
One-to-four family residential \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,044	2,153
Multi-family residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	76,122	31,100
Past Due	0	0
Total Loans	76,122	31,100
Non- Accrual	0	0
90 Days+ Past Due and Accruing	0	0
Multi-family residential \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Multi-family residential \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	164,712	136,225
Past Due	1,280	3,718
Total Loans	165,992	139,943
Non- Accrual	1,280	1,417
90 Days+ Past Due and Accruing	0	0
Commercial real estate \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	2,301
Commercial real estate \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,280	1,417
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	201,320	252,123
Past Due	4,093	8,525
Total Loans	205,413	260,648
Non- Accrual	4,093	8,525
90 Days+ Past Due and Accruing	0	0
Construction and land development \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Construction and land development \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,093	8,525
Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	57,236	12,916
Past Due	0	0
Total Loans	57,236	12,916
Non- Accrual	0	0
90 Days+ Past Due and Accruing	0	0
Commercial business \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Commercial business \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Loan to financial institutions
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		6,000
Past Due		0
Total Loans		6,000
Non- Accrual		0
90 Days+ Past Due and Accruing		0
Loan to financial institutions \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Loan to financial institutions \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		176
Past Due		0
Total Loans		176
Non- Accrual		0
Leases \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Leases \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due		0
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	493	604
Past Due	37	0
Total Loans	530	604
Non- Accrual	0	0
90 Days+ Past Due and Accruing	0	0
Consumer \| 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	0
Consumer \| Over 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 0	$ 0

LOANS RECEIVABLE - Activity in

LOANS RECEIVABLE - Activity in allowance (Details) - USD ($)	3 Months Ended						12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					$ 5,393,000		$ 8,303,000	$ 5,393,000	$ 5,167,000
Charge-offs							(40,000)	(144,000)	(38,000)
Recoveries							54,000	29,000	164,000
Provision	$ 200,000	$ 1,650,000	$ 750,000	$ 500,000	125,000	$ 100,000	200,000	3,025,000	100,000
ALLL balance	8,517,000	8,303,000				5,393,000	8,517,000	8,303,000	5,393,000
One-to-four family residential
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					1,002,000		1,877,000	1,002,000	1,325,000
Charge-offs								(3,000)	(7,000)
Recoveries							5,000	14,000	164,000
Provision							(217,000)	864,000	(480,000)
ALLL balance	1,665,000	1,877,000				1,002,000	1,665,000	1,877,000	1,002,000
Multi-family residential
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					315,000		460,000	315,000	347,000
Charge-offs									0
Recoveries									0
Provision							591,000	145,000	(32,000)
ALLL balance	1,051,000	460,000				315,000	1,051,000	460,000	315,000
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					1,257,000		1,989,000	1,257,000	1,154,000
Charge-offs									0
Recoveries									0
Provision							231,000	732,000	103,000
ALLL balance	2,220,000	1,989,000				1,257,000	2,220,000	1,989,000	1,257,000
Construction and land development
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					2,034,000		2,888,000	2,034,000	1,554,000
Charge-offs							(40,000)		0
Recoveries									0
Provision							(880,000)	854,000	480,000
ALLL balance	1,968,000	2,888,000				2,034,000	1,968,000	2,888,000	2,034,000
Commercial business
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					206,000		194,000	206,000	187,000
Charge-offs								(15,000)	0
Recoveries							14,000		0
Provision							591,000	3,000	19,000
ALLL balance	799,000	194,000				206,000	799,000	194,000	206,000
Loan to financial institutions
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					63,000		89,000	63,000	64,000
Charge-offs									0
Recoveries									0
Provision							(89,000)	26,000	(1,000)
ALLL balance		89,000				63,000		89,000	63,000
Leases
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					5,000		3,000	5,000	18,000
Charge-offs									(31,000)
Recoveries								9,000	0
Provision							(3,000)	(11,000)	18,000
ALLL balance		3,000				5,000		3,000	5,000
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					13,000		6,000	13,000	17,000
Charge-offs								(126,000)	0
Recoveries							35,000	6,000	0
Provision							(26,000)	113,000	(4,000)
ALLL balance	15,000	6,000				13,000	15,000	6,000	13,000
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
ALLL balance					$ 498,000		797,000	498,000	501,000
Provision							2,000	299,000	(3,000)
ALLL balance	$ 799,000	$ 797,000				$ 498,000	$ 799,000	$ 797,000	$ 498,000

LOANS RECEIVABLE - Additional I

LOANS RECEIVABLE - Additional Information 1 (Details)	1 Months Ended	3 Months Ended							12 Months Ended
LOANS RECEIVABLE - Additional Information 1 (Details)	Oct. 31, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Jun. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) from interest income on nonaccrual loans									$ 513,000	$ 748,000	$ 786,000
Fair value of loans acquired net of discount		$ 160,800,000							160,800,000
Discount on fair value of loans acquired		4,600,000							4,600,000
Discount remained		2,100,000							2,100,000
Provision for loan losses		200,000		$ 1,650,000	$ 750,000	$ 500,000	$ 125,000	$ 100,000	200,000	3,025,000	100,000
Non performing assets		$ 12,500,000		$ 13,000,000					$ 12,500,000	$ 13,000,000
Percentage of nonperforming assets									1.10%	1.10%
Number of non-accrual loans \| loan									1
Number of real estate properties \| loan		2							2
Number of loans receivables classified as troubled debt restructuring \| loan		2							2
Amount of loans classified as troubled debt restructuring		$ 1,100,000							$ 1,100,000
Financing receivable		$ 390,000							$ 390,000
Number of units sold \| loan									33
Proceeds from loan receviables									$ 825,000
Non-performing assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans receivables classified as troubled debt restructuring \| loan		2							2
Amount of loans classified as troubled debt restructuring		$ 705,000							$ 705,000
One-to-four family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses									(217,000)	$ 864,000	(480,000)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses									231,000	732,000	103,000
Non performing assets		1,300,000							$ 1,300,000
Number of non-accrual loans \| loan									2
Commercial real estate \| Real estate loan \| Non-performing assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non performing assets	$ 10,000,000
Percentage of nonperforming assets	1.50%
Number of non-accrual loans \| loan	2
One To Four Family Residential Real Estate Owned Properties [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non performing assets		3,000,000							$ 3,000,000
Number of non-accrual loans \| loan									18
Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses									$ (880,000)	$ 854,000	$ 480,000
Non performing assets		$ 4,100,000	$ 4,100,000						$ 4,100,000
Number of non-accrual loans \| loan			2						3

LOANS RECEIVABLE - Additional_2

LOANS RECEIVABLE - Additional Information 2 (Details)	3 Months Ended						12 Months Ended
LOANS RECEIVABLE - Additional Information 2 (Details)	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructurings ("TDRs"), Recorded investment	$ 1,100,000						$ 1,100,000
Amount of TDR loans, default							6,000,000
Write-down amount of TDR loans							$ 1,900,000
Number of loans classified as troubled debt restructuring \| loan	2						2
Loans receivable, net	$ 618,206,000	$ 588,300,000					$ 618,206,000	$ 588,300,000
Charge-offs							40,000	144,000	$ 38,000
Recoveries							54,000	29,000	164,000
Provision for loan losses	200,000	1,650,000	$ 750,000	$ 500,000	$ 125,000	$ 100,000	200,000	3,025,000	$ 100,000
Carrying amount	707,623,000	$ 685,259,000					$ 707,623,000	$ 685,259,000
Residential real estate property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| loan							5
Carrying amount	613,000,000,000						$ 613,000,000,000
Non-performing assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructurings ("TDRs"), Recorded investment	$ 705,000						$ 705,000
Number of loans classified as troubled debt restructuring \| loan	2						2
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans classified as troubled debt restructuring \| loan	0						0

OFFICE PROPERTIES AND EQUIPME_3

OFFICE PROPERTIES AND EQUIPMENT - Summary of office properties and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Total	$ 13,088	$ 12,932
Accumulated depreciation	(6,238)	(5,803)
Total office properties and equipment, net of accumulated depreciation	6,850	7,129
Land
Property, Plant and Equipment [Line Items]
Total	1,437	1,437
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total	7,449	7,449
Furniture and equipment
Property, Plant and Equipment [Line Items]
Total	$ 4,202	$ 4,046

OFFICE PROPERTIES AND EQUIPME_4

OFFICE PROPERTIES AND EQUIPMENT - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
OFFICE PROPERTIES AND EQUIPMENT
Depreciation expense	$ 435,000	$ 484,000	$ 619,000

DEPOSITS (Details)

DEPOSITS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Amount
Non interest-bearing checking accounts	$ 37,409	$ 30,002
Interest-bearing checking accounts	87,752	135,797
Money market deposit accounts	111,488	111,105
Passbook, club and statement savings	229,989	224,435
Certificates maturing in six months or less	143,767	125,165
Certificates maturing in more than six months	101,110	144,445
Total deposits	$ 711,515	$ 770,949
Percent
Non interest-bearing checking accounts	5.30%	3.90%
Interest-bearing checking accounts	12.30%	17.60%
Money market deposit accounts	15.70%	14.40%
Passbook, club and statement savings	32.30%	29.10%
Certificates maturing in six months or less	20.20%	16.20%
Certificates maturing in more than six months	14.20%	18.80%
Total	100.00%	100.00%

DEPOSITS - Summary of scheduled

DEPOSITS - Summary of scheduled maturities of certificate accounts (Details) $ in Thousands	Sep. 30, 2021USD ($)
DEPOSITS [Abstract]
One year or less	$ 182,719
One through two years	33,547
Two through three years	19,700
Three through four years	6,073
Four through five years	2,838
Total	$ 244,877

DEPOSITS - Interest expense on

DEPOSITS - Interest expense on deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
DEPOSITS [Abstract]
Checking and money market deposit accounts	$ 3,580	$ 2,045	$ 899
Passbook, club and statement savings accounts	10	38	124
Certificate accounts	4,687	8,819	12,137
Total	$ 8,277	$ 10,902	$ 13,160

DEPOSITS - Additional Informati

DEPOSITS - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
DEPOSITS [Abstract]
Certificates of $250,000 and over	$ 95.3	$ 76.6
Brokered deposits	$ 91.7	$ 63.4

ADVANCES FROM FEDERAL HOME LO_5

ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Balance outstanding at end of period		$ 25,000
Federal Home Loan Bank of Pittsburgh
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Average balance outstanding	$ 9,932	66,735	$ 31,158
Maximum amount outstanding at any month-end during the period	$ 25,000	115,000	90,000
Balance outstanding at end of period		$ 25,000	$ 90,000
Weight-average rate during the period	0.39%	1.58%	2.53%
Weight-average rate at period end		0.39%	2.32%

ADVANCES FROM FEDERAL HOME LO_6

ADVANCES FROM FEDERAL HOME LOAN BANK - SHORT TERM - Additional Information (Details) $ in Thousands	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Short-term Debt [Line Items]
Advances from Federal Home Loan Bank - short term		$ 25,000
ACBB
Short-term Debt [Line Items]
Unsecured borrowing facilities maximum capacity	$ 12,500
PNC
Short-term Debt [Line Items]
Unsecured borrowing facilities maximum capacity	$ 10,000
Interest rate swap contract one
Short-term Debt [Line Items]
Number of 90 day FHLB advances \| loan	1
Federal Home Loan Bank of Pittsburgh
Short-term Debt [Line Items]
Advances from Federal Home Loan Bank - short term		$ 25,000	$ 90,000

ADVANCES FROM FEDERAL HOME LO_7

ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Federal Home Loan Bank, Advances [Line Items]
Amount	$ 232,025	$ 260,253
Long-term
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	2.58%
Amount	$ 232,025	260,253
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 20 to 30 Sep 21
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑20
Date of maturity to	30‑Sep‑21
Amount	$ 0	5,179
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 20 to 30 Sep 21 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	1.94%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 20 to 30 Sep 21 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	2.83%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 20 to 30 Sep 21 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.77%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 21 to 30 Sep 22
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑21
Date of maturity to	30‑Sep‑22
Amount	$ 2,227	5,523
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 21 to 30 Sep 22 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	1.99%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 21 to 30 Sep 22 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	3.05%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 21 to 30 Sep 22 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.96%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 22 to 30 Sep 23
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑22
Date of maturity to	30‑Sep‑23
Amount	$ 3,551	5,265
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 22 to 30 Sep 23 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	1.94%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 22 to 30 Sep 23 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	3.11%
Long-term \| Fixed Rate Amortizing Maturity from 1 Oct 22 to 30 Sep 23 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.89%
Long-term \| Fixed Rate - Amortizing
Federal Home Loan Bank, Advances [Line Items]
Amount	$ 5,778	15,967
Weighted average interest rate	2.92%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 20 to 30 Sep 21
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑20
Date of maturity to	30‑Sep‑21
Amount	$ 0	17,996
Long-term \| Fixed Rate Advances Maturity from 1 Oct 20 to 30 Sep 21 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	1.42%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 20 to 30 Sep 21 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	2.92%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 20 to 30 Sep 21 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.37%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 21 to 30 Sep 22
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑21
Date of maturity to	30‑Sep‑22
Amount	$ 63,250	63,293
Long-term \| Fixed Rate Advances Maturity from 1 Oct 21 to 30 Sep 22 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	1.94%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 21 to 30 Sep 22 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	3.23%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 21 to 30 Sep 22 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.31%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 22 to 30 Sep 23
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑22
Date of maturity to	30‑Sep‑23
Amount	$ 94,999	94,999
Long-term \| Fixed Rate Advances Maturity from 1 Oct 22 to 30 Sep 23 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	2.00%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 22 to 30 Sep 23 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	3.22%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 22 to 30 Sep 23 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.52%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 23 to 30 Sep 24
Federal Home Loan Bank, Advances [Line Items]
Date of maturity from	1‑Oct‑23
Date of maturity to	30‑Sep‑24
Amount	$ 67,998	67,998
Long-term \| Fixed Rate Advances Maturity from 1 Oct 23 to 30 Sep 24 \| Minimum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	2.38%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 23 to 30 Sep 24 \| Maximum
Federal Home Loan Bank, Advances [Line Items]
Stated interest rate range	3.20%
Long-term \| Fixed Rate Advances Maturity from 1 Oct 23 to 30 Sep 24 \| Weighted average
Federal Home Loan Bank, Advances [Line Items]
Weighted average interest rate	2.88%
Long-term \| Fixed Rate - Advances
Federal Home Loan Bank, Advances [Line Items]
Amount	$ 226,247	$ 244,286
Weighted average interest rate	2.57%

ADVANCES FROM FEDERAL HOME LO_8

ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM - Summary of advances from the FHLB of Pittsburgh with coupon rates (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM
2022	$ 65,477
2023	98,550
2024	67,998
Advances from Federal Home Loan Bank - long term	$ 232,025	$ 260,253
Weighted Average Coupon Rate
2022	2.33%
2023	2.54%
2024	2.88%
Weighted Average Coupon Rate	2.58%

ADVANCES FROM FEDERAL HOME LO_9

ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM - Additional Information (Details) $ in Millions	Sep. 30, 2021USD ($)
ADVANCES FROM FEDERAL HOME LOAN BANK - LONG TERM
Additional FHLB advances	$ 101.7

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
INCOME TAXES (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Current:
Federal expense									$ 564	$ 1,952	$ 2,133
State expense									28	93	205
Total current taxes									592	2,045	2,338
Deferred income tax benefit									677	(445)	(188)
Total income tax provision	$ 361	$ 387	$ 235	$ 286	$ 799	$ 582	$ 380	$ 389	$ 1,269	$ 1,600	$ 2,150

INCOME TAXES - Items that gave

INCOME TAXES - Items that gave rise to significant portions of deferred income taxes (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Deferred tax assets:
Allowance for loan losses	$ 1,716,000	$ 2,071,000
Nonaccrual interest	395,000	561,000
Accrued vacation	14,000	16,000
Capital loss carryforward	4,000	4,000
Split dollar life insurance	9,000	9,000
Post-retirement benefits	67,000	72,000
Realized loss on equity securities		3,000
Unrealized losses on interest rate swaps	2,199,000	3,596,000
Deferred compensation	767,000	781,000
Goodwill	47,000	58,000
Lease liability	256,000
Other	79,000	48,000
Employee benefit plans	242,000	187,000
Total deferred tax assets	5,795,000	7,406,000
Valuation allowance	4,000	4,000
Total deferred tax assets, net of valuation allowance	5,791,000	7,402,000
Deferred tax liabilities:
Property	127,000	137,000
Right of Use	233,000
Realized gain on equity securities	3,000
Unrealized gains on available for sale securities	1,621,000	2,813,000
Purchase accounting adjustments	394,000	321,000
Deferred loan fees	392,000	229,000
Total deferred tax liabilities	2,770,000	3,500,000
Net deferred tax assets	$ 3,021,000	$ 3,902,000

INCOME TAXES - Income tax expen

INCOME TAXES - Income tax expense differs from that computed at the statutory federal corporate tax rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
INCOME TAXES
Tax at statutory rate, amount									$ 1,900	$ 2,343	$ 2,453
Adjustments resulting from:
State tax expense									28	93	162
Tax exempt income, amount									(553)	(537)	(313)
Capital gain from sale of securities, amount									0	(117)	0
Income from bank owned life insurance, amount									(130)	(138)	(135)
Employee benefit plans									24	(27)	(27)
Other, amount									0	(17)	10
Total income tax provision	$ 361	$ 387	$ 235	$ 286	$ 799	$ 582	$ 380	$ 389	$ 1,269	$ 1,600	$ 2,150
Tax at statutory rate, percentage of pretax income (Loss)									21.00%	21.00%	21.00%
Adjustments resulting from:
State tax expense, percentage of pretax income (Loss)									0.30%	0.80%	1.30%
Tax exempt income, percentage of pretax income (Loss)									(6.10%)	(4.80%)	(2.70%)
Capital gain from sale of securities, percentage of pretax income (Loss)									0.00%	(1.00%)	0.00%
Income from bank owned life insurance, percentage of pretax income (Loss)									(1.40%)	(1.20%)	(1.10%)
Employee benefit plans, percentage of pretax income (Loss)									0.20%	(0.30%)	(0.20%)
Other, percentage of pretax income (Loss)									0.00%	(0.20%)	0.10%
Income tax expense, percentage of pretax income (Loss)									14.00%	14.30%	18.40%

INCOME TAXES - Additional Infor

INCOME TAXES - Additional Information (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
INCOME TAXES
Valuation allowance	$ 4,000	$ 4,000

REGULATORY CAPITAL REQUIREMEN_3

REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)
Prudential Bancorp, Inc of Pennsylvania
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual Amount, Tier 1 capital (to average assets)	$ 126,281	$ 125,618
Actual Ratio, Tier 1 capital (to average assets)	11.48	10.34
Actual Amount, Tier 1 Common (to risk-weighted assets)	$ 126,281	$ 125,618
Actual Ratio, Tier 1 Common (to risk-weighted assets)	16.70	17.21
Actual Amount, Tier 1 capital (to risk-weighted assets)	$ 126,281	$ 125,618
Actual Ratio, Tier 1 capital (to risk-weighted assets)	16.70	17.21
Actual Amount, Total capital (to risk-weighted assets)	$ 135,167	$ 134,389
Actual Ratio, Total capital (to risk-weighted assets)	17.87	18.41
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual Amount, Tier 1 capital (to average assets)	$ 123,840	$ 123,185
Actual Amount, Required for Capital Adequacy Purposes Amount, Tier 1 capital (to average assets)	43,855	46,867
Actual Amount, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier 1 capital (to average assets)	$ 54,819	$ 58,584
Actual Ratio, Tier 1 capital (to average assets)	11.30	10.51
Actual Ratio, Required for Capital Adequacy Purposes Ratio, Tier 1 capital (to average assets)	4	4
Actual Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio, Tier 1 capital (to average assets)	5	5
Actual Amount, Tier 1 Common (to risk-weighted assets)	$ 123,840	$ 123,185
Actual Amount, Required for Capital Adequacy Purposes, Tier 1 Common (to risk-weighted assets)	34,033	32,841
Actual Amount, To Be Well Capitalized Under Prompt Corrective Action Provisions, Tier 1 Common (to risk-weighted assets)	$ 49,159	$ 47,437
Actual Ratio, Tier 1 Common (to risk-weighted assets)	16.37	16.88
Actual Ratio, Required for Capital Adequacy Purposes, Tier 1 Common (to risk-weighted assets)	4.50%	4.50%
Actual Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Tier 1 Common (to risk-weighted assets)	6.50%	6.50%
Actual Amount, Tier 1 capital (to risk-weighted assets)	$ 123,840	$ 123,185
Actual Amount, Required for Capital Adequacy Purposes Amount, Tier 1 capital (to risk-weighted assets)	45,377	43,788
Actual Amount, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier 1 capital (to risk-weighted assets)	$ 60,503	$ 58,384
Actual Ratio, Tier 1 capital (to risk-weighted assets)	16.37	16.88
Actual Ratio, Required for Capital Adequacy Purposes Ratio, Tier 1 capital (to risk-weighted assets)	6	6
Actual Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio, Tier 1 capital (to risk-weighted assets)	8	8
Actual Amount, Total capital (to risk-weighted assets)	$ 132,726	$ 131,956
Actual Amount, Required for Capital Adequacy Purposes Amount, Total capital (to risk-weighted assets)	60,503	58,384
Actual Amount, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Total capital (to risk-weighted assets)	$ 75,629	$ 72,980
Actual Ratio, Total capital (to risk-weighted assets)	17.55	18.08
Actual Ratio, Required for Capital Adequacy Purposes Ratio, Total capital (to risk-weighted assets)	8	8
Actual Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio, Total capital (to risk-weighted assets)	10	10

EMPLOYEE BENEFITS - Multi-emplo

EMPLOYEE BENEFITS - Multi-employer defined benefit pension plan (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Multi-employer defined benefit pension plan
Multiemployer Plans [Line Items]
Expense relating to plan	$ 780,000	$ 743,000	$ 632,000

EMPLOYEE BENEFITS - Additional

EMPLOYEE BENEFITS - Additional information regarding the plan (Details)	12 Months Ended
	Sep. 30, 2021USD ($)
Multiemployer Plans [Line Items]
Plan Employer Identification Number	46-2935427
Multi-employer defined benefit pension plan \| Pentegra Defined Benefits Plan for Financial Institutions [Member]
Multiemployer Plans [Line Items]
Plan Employer Identification Number	13-5645888
The Company's Contribution for the year ended September 30, 2019	$ 780,000
Are Company's Contributions more than 5% of total contributions?	No
Funded Status	96.49%

EMPLOYEE BENEFITS - Expense Rel

EMPLOYEE BENEFITS - Expense Relating to Plan (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Pentegra Defined Benefits Plan for Financial Institutions [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Bank defined contribution plan, expense	$ 254,000	$ 231,000	$ 126,000

EMPLOYEE BENEFITS - 2008 RRP an

EMPLOYEE BENEFITS - 2008 RRP and 2014 SIP (Details) - shares	1 Months Ended
	Mar. 31, 2019	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting per year	20.00%
Vesting period of awards granted	5 years
2008 Recognition and Retention Plan ("2008 RRP")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	8,209
2014 Stock Incentive Plan (the "2014 SIP")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	18,291
2014 Stock Incentive Plan (the "2014 SIP") \| Restricted stock awards or units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares awarded under the plan		285,655
Number of shares granted		233,500

EMPLOYEE BENEFITS - Summary of

EMPLOYEE BENEFITS - Summary of non-vested stock award activity (Details) - 2008 Recognition and Retention Plan ("2008 RRP") - $ / shares	1 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2021
Number of Shares
Issued	8,209
Non-vested stock awards
Number of Shares
Non-vested stock awards at beginning of period		23,056
Forfeited		0
Vested		(11,085)
Non-vested stock awards at the end of the period		11,971
Weighted Average Grant Date Fair Value
Nonvested stock awards at beginning of period		$ 17.78
Forfeited		0
Vested		17.30
Non-vested stock awards at the end of the period		$ 18.24

EMPLOYEE BENEFITS - Summary o_2

EMPLOYEE BENEFITS - Summary of status of stock options under Option Plan and 2014 SIP (Details) - Option Plan and 2014 SIP - Stock Options	12 Months Ended
	Sep. 30, 2021$ / sharesshares
Number of Shares
Options outstanding at beginning of period \| shares	571,258
Granted \| shares	4,500
Exercised \| shares	(15,000)
Forfeited \| shares	(39,500)
Outstanding at the end of the period \| shares	521,258
Exercisable at the end of the period \| shares	418,471
Weighted Average Exercise Price
Options outstanding at beginning of period \| $ / shares	$ 14.58
Granted \| $ / shares	13.86
Exercised \| $ / shares	12.23
Forfeited \| $ / shares	18.42
Outstanding at the end of the period \| $ / shares	14.23
Exercisable at the end of the period \| $ / shares	$ 13.74

EMPLOYEE BENEFITS - Stock Optio

EMPLOYEE BENEFITS - Stock Options - Additional Information (Details) - USD ($)	1 Months Ended			12 Months Ended
	Jun. 30, 2021	Jul. 31, 2019	Mar. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of options			5 years
Stock Options \| 2008 Stock Option Plan (the "2008 Option Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting and exercisable per year				20.00%
Vesting period of options				5 years
Exercisable period of options after grant date				10 years
Number of common stock available for issuance				533,808
Weighted average remaining contractual term for options outstanding					5 years 1 month 6 days
Unrecognized compensation expense for options				$ 271,000
Weighted average period for recognition of nonvested awards				2 years
Stock Options \| 2014 Stock Incentive Plan (the "2014 SIP")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock available for issuance				714,145
Number of options awarded	4,500	39,702			12,500
Stock Options \| Option Plan and 2014 SIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense				$ 169,000	$ 353,000	$ 573,000
Number of options awarded				4,500
Stock Options \| Granted in fiscal 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value of options granted per share						$ 3.38
Fair value, valuation method						Black-Scholes pricing model
Exercise price and fair value						$ 18.16
Expected term						7 years
Volatility rate						17.76%
Expected interest rate						1.87%
Expected yield						1.10%
Stock Options \| Granted In Fiscal 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value of options granted per share					$ 2.31
Fair value, valuation method					Black-Scholes pricing model
Exercise price and fair value					$ 10
Expected term					7 years
Volatility rate					33.22%
Expected interest rate					0.41%
Expected yield					2.80%
Stock Options \| Granted In Fiscal 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value of options granted per share				$ 3.91
Fair value, valuation method				Black-Scholes pricing model
Exercise price and fair value				$ 13.86
Expected term				7 years
Volatility rate				34.46%
Expected interest rate				1.19%
Expected yield				2.02%

INTEREST RATE SWAP AGREEMENTS -

INTEREST RATE SWAP AGREEMENTS - Summary of interest rate swap agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
INTEREST RATE SWAP AGREEMENTS
Unrealized Gain (Loss)	$ (12,834)	$ (20,960)
Interest rate swap contract maturing on 1 May 2028 \| State and political subdivisions
INTEREST RATE SWAP AGREEMENTS
Notional amount	$ 21,570	$ 21,570
Receive rate	3 Mth Libor	3 Mth Libor
Unrealized Gain (Loss)	$ (2,365)	$ (3,834)
Interest rate swap contract maturing on 1 May 2028 \| State and political subdivisions \| Minimum
INTEREST RATE SWAP AGREEMENTS
Pay rate	3.06%	3.06%
Maturity date	Feb. 1, 2027	Feb. 1, 2027
Interest rate swap contract maturing on 1 May 2028 \| State and political subdivisions \| Maximum
INTEREST RATE SWAP AGREEMENTS
Pay rate	3.07%	3.07%
Maturity date	May 1, 2028	May 1, 2028
Interest rate swap contract maturing on 1 Aug 2026 \| Commercial Loan
INTEREST RATE SWAP AGREEMENTS
Notional amount	$ 23,656	$ 23,656
Receive rate	1 Mth Libor +225 to 276 bp	1 Mth Libor +225 to 276 bp
Interest rate swap contract maturing on 1 Aug 2026 \| Commercial Loan \| Minimum
INTEREST RATE SWAP AGREEMENTS
Pay rate	4.10%	4.10%
Maturity date	Jun. 13, 2025	Jun. 13, 2025
Interest rate swap contract maturing on 1 Aug 2026 \| Commercial Loan \| Maximum
INTEREST RATE SWAP AGREEMENTS
Pay rate	5.74%	5.74%
Maturity date	Aug. 1, 2026	Aug. 1, 2026
Interest rate swap contract maturing on 12 Jun 2026 \| 30 day wholesale funding
INTEREST RATE SWAP AGREEMENTS
Notional amount	$ 90,000	$ 90,000
Receive rate	1 Mth Libor	1 Mth Libor
Unrealized Gain (Loss)	$ (3,495)	$ (6,157)
Interest rate swap contract maturing on 12 Jun 2026 \| 30 day wholesale funding \| Minimum
INTEREST RATE SWAP AGREEMENTS
Pay rate	1.36%	1.36%
Maturity date	Feb. 15, 2024	Feb. 15, 2024
Interest rate swap contract maturing on 12 Jun 2026 \| 30 day wholesale funding \| Maximum
INTEREST RATE SWAP AGREEMENTS
Pay rate	2.70%	2.70%
Maturity date	Jun. 12, 2026	Jun. 12, 2026
Interest rate swap contract maturing on 27 Mar 24 \| 90 day wholesale funding
INTEREST RATE SWAP AGREEMENTS
Notional amount	$ 135,000	$ 135,000
Receive rate	3 Mth Libor	3 Mth Libor
Unrealized Gain (Loss)	$ (6,974)	$ (10,969)
Interest rate swap contract maturing on 27 Mar 24 \| 90 day wholesale funding \| Minimum
INTEREST RATE SWAP AGREEMENTS
Pay rate	2.51%	2.51%
Maturity date	Jan. 11, 2024	Jan. 11, 2024
Interest rate swap contract maturing on 27 Mar 24 \| 90 day wholesale funding \| Maximum
INTEREST RATE SWAP AGREEMENTS
Pay rate	2.78%	2.78%
Maturity date	Mar. 27, 2024	Mar. 27, 2024

INTEREST RATE SWAP AGREEMENTS_2

INTEREST RATE SWAP AGREEMENTS - Additional Information (Details)	12 Months Ended
	Sep. 30, 2021USD ($)itemloansecurity	Sep. 30, 2020USD ($)loansecurity	Sep. 30, 2019USD ($)
INTEREST RATE SWAP AGREEMENTS
Number of interest rate swaps \| item	9
Number of loans \| loan	4	3
Number of investment securities \| security	7	7
Fair value hedging
INTEREST RATE SWAP AGREEMENTS
Income (expense) recognized as ineffectiveness \| $	$ (5,000)	$ 4,000	$ 12,000

COMMITMENTS AND CONTINGENT LI_2

COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
COMMITMENTS AND CONTINGENT LIABILITIES
Outstanding commitments	$ 600,000,000
Aggregate undisbursed portion of loans-in-process	80,620	$ 86,862
Loan Origination Commitments
COMMITMENTS AND CONTINGENT LIABILITIES
Outstanding commitments	34,900	29,900
Aggregate undisbursed portion of loans-in-process	$ 80,600	$ 86,900
Loan Origination Commitments \| Minimum
COMMITMENTS AND CONTINGENT LIABILITIES
Market interest rate on fixed and variable rate loans	2.99%	3.25%
Loan Origination Commitments \| Maximum
COMMITMENTS AND CONTINGENT LIABILITIES
Market interest rate on fixed and variable rate loans	5.00%	4.75%
Unused lines of Credit
COMMITMENTS AND CONTINGENT LIABILITIES
Outstanding commitments	$ 68,100	$ 40,100
Letters of Credit
COMMITMENTS AND CONTINGENT LIABILITIES
Outstanding commitments	$ 1,200	$ 1,100

FAIR VALUE MEASUREMENT - Assets

FAIR VALUE MEASUREMENT - Assets measured at fair value on recurring and non-recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Measurements, Recurring
Assets:
Assets, Total	$ 305,969	$ 420,415
Liabilities:
Liabilities, Total	12,834	20,960
Fair Value, Measurements, Recurring \| Level 1
Assets:
Assets, Total	22	51
Fair Value, Measurements, Recurring \| Level 2
Assets:
Assets, Total	305,947	420,364
Liabilities:
Liabilities, Total	12,834	20,960
Fair Value, Measurements, Recurring \| U.S. Government and agency obligations
Assets:
Assets, Total	3,194	22,394
Fair Value, Measurements, Recurring \| U.S. Government and agency obligations \| Level 2
Assets:
Assets, Total	3,194	22,394
Fair Value, Measurements, Recurring \| State and political subdivisions
Assets:
Assets, Total	72,259	79,621
Fair Value, Measurements, Recurring \| State and political subdivisions \| Level 2
Assets:
Assets, Total	72,259	79,621
Fair Value, Measurements, Recurring \| Mortgage-Backed Securities
Assets:
Assets, Total	135,353	236,566
Fair Value, Measurements, Recurring \| Mortgage-Backed Securities \| Level 2
Assets:
Assets, Total	135,353	236,566
Fair Value, Measurements, Recurring \| Corporate bonds
Assets:
Assets, Total	95,141	81,783
Fair Value, Measurements, Recurring \| Corporate bonds \| Level 2
Assets:
Assets, Total	95,141	81,783
Fair Value, Measurements, Recurring \| Equity security - FHLMC preferred stock
Assets:
Assets, Total	22	51
Fair Value, Measurements, Recurring \| Equity security - FHLMC preferred stock \| Level 1
Assets:
Assets, Total	22	51
Fair Value, Measurements, Recurring \| Interest rate swap
Liabilities:
Liabilities, Total	12,834	20,960
Fair Value, Measurements, Recurring \| Interest rate swap \| Level 2
Liabilities:
Liabilities, Total	12,834	$ 20,960
Fair value measurements on a nonrecurring basis
Assets:
Assets, Total	4,109
Fair value measurements on a nonrecurring basis \| Level 3
Assets:
Assets, Total	4,109
Fair value measurements on a nonrecurring basis \| Other Real Estate Owned [Member]
Assets:
Assets, Total	4,109
Fair value measurements on a nonrecurring basis \| Other Real Estate Owned [Member] \| Level 3
Assets:
Assets, Total	$ 4,109

FAIR VALUE MEASUREMENT - Valuat

FAIR VALUE MEASUREMENT - Valuation processes used to determine nonrecurring fair value measurements categorized within level 3 (Details) - Real estate owned - Fair value measurements on a nonrecurring basis - Level 3 - Management discount for selling costs, property type and market volatility - Property appraisals	Sep. 30, 2021USD ($)
FAIR VALUE MEASUREMENT
Other Real estate owned	$ 4,109,000
Real estate owned measurement input (in percent)	0.02

FAIR VALUE MEASUREMENT - Asse_2

FAIR VALUE MEASUREMENT - Assets measured at fair value on a non-recurring basis and the adjustments to the carrying value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Assets:
Loans receivable, net	$ 618,206	$ 588,300
Restricted stock	10,091	12,532
Liabilities:
Certificates of deposit	244,877
Advances from FHLB long-term	232,025	260,253
Carrying Amount
Assets:
Investment and mortgage-backed securities held to maturity	20,074	22,860
Loans receivable, net	618,206	588,300
Liabilities:
Certificates of deposit	244,877	269,610
Advances from FHLB long-term	232,025	260,253
Fair Value
Assets:
Investment and mortgage-backed securities held to maturity	21,161	24,330
Loans receivable, net	620,017	593,768
Liabilities:
Certificates of deposit	252,510	278,224
Advances from FHLB long-term	239,301	274,172
Level 2 \| Fair Value
Assets:
Investment and mortgage-backed securities held to maturity	21,161	24,330
Level 3 \| Fair Value
Assets:
Loans receivable, net	620,017	593,768
Liabilities:
Certificates of deposit	252,510	278,224
Advances from FHLB long-term	$ 239,301	$ 274,172

FAIR VALUE MEASUREMENT - Additi

FAIR VALUE MEASUREMENT - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Level 2
FAIR VALUE MEASUREMENT
Collateral dependent impaired loans, fair value	$ 8.4	$ 13

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS - Related to acquisition of Polonia Bancorp (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Goodwill
Balance, Goodwill	$ 6,102
Balance, Goodwill	6,102	$ 6,102
Core deposit intangible
Balance	340
Balance	246	340
GOODWILL AND OTHER INTANGIBLE ASSETS, Total
Amortization	(94)	(108)	$ (123)
Polonia Bancorp
Goodwill
Balance, Goodwill	6,102
Additions/Adjustments	0
Balance, Goodwill	6,102	6,102
GOODWILL AND OTHER INTANGIBLE ASSETS, Total
Balance, Total	6,442
Additions/Adjustments	0
Amortization	(94)
Balance, Total	6,348	6,442
Polonia Bancorp \| Core deposit intangible
Core deposit intangible
Balance	340
Additions/Adjustments	0
Amortization	(94)
Balance	$ 246	$ 340
Amortization Period	10 years

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLE ASSETS - Future fiscal periods amortization expense (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
GOODWILL AND OTHER INTANGIBLE ASSETS
2022	$ 78
2023	64
2024	49
2025	34
2026	18
Thereafter	3
Total	$ 246	$ 340

LEASES (Details)

LEASES (Details)	Sep. 30, 2021
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases in years	6 years 3 months
Weighted-average discount rate - operating leases	2.00%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	9 years

LEASES - Aggregate lease maturi

LEASES - Aggregate lease maturities and obligations (Details)	Sep. 30, 2021USD ($)
2022	$ 213,000
2023	216,000
2024	220,000
2025	231,000
2026	126,000
2027 and thereafter	291,000
Total lease payments	1,297,000
Less: interest	77,000
Present value of lease liabilities	$ 1,220,000
Operating lease liability, balance sheet location	Accounts Payable and Accrued Liabilities Current and Noncurrent
Certain Lease Commitments [Member]
2022	$ 246,000
2023	249,000
2024	252,000
2025	266,000
2026	169,000
2027 and thereafter	$ 309,000

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($)	12 Months Ended
LEASES - Narrative (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Lease expense	$ 239,000	$ 236,000	$ 304,000
Operating lease ROU assets	$ 1,100,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Prepaid Expense and Other Assets
Operating lease liabilities	$ 1,220,000
Operating lease liabilities	$ 1,297,000
Operating lease liability, balance sheet location	Accounts Payable and Accrued Liabilities Current and Noncurrent
Minimum
Remaining lease term (in years)	5 years
Maximum
Remaining lease term (in years)	9 years

PRUDENTIAL BANCORP, INC. (PAR_3

PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) - STATEMENT OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Assets:
Cash	$ 82,698	$ 117,081
TOTAL ASSETS	1,100,468	1,223,353
Stockholders' equity:
Preferred stock
Common stock	108	108
Additional paid-in capital	118,424	118,270
Treasury stock	(44,351)	(39,207)
Retained earnings	58,450	52,889
Accumulated other comprehensive income (loss)	(2,175)	(2,943)
Total stockholders' equity	130,456	129,117	$ 139,611	$ 128,409
PRUDENTIAL BANCORP, INC. OF PENNSYLVANIA
Assets:
Cash	854	955
Investment in Bank	128,014	126,684
Other assets	1,588	1,478
TOTAL ASSETS	130,456	129,117
Stockholders' equity:
Common stock	108	108
Additional paid-in capital	118,424	118,270
Treasury stock	(44,351)	(39,207)
Retained earnings	58,450	52,889
Accumulated other comprehensive income (loss)	(2,175)	(2,943)
Total stockholders' equity	$ 130,456	$ 129,117

PRUDENTIAL BANCORP, INC. (PAR_4

PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) - INCOME STATEMENT (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)
Interest on ESOP loan													$ 25,661	$ 25,141	$ 26,737
Professional services													1,634	1,698	1,460
Other expense													1,830	1,862	2,162
Total expense	$ 4,638	$ 4,543	$ 4,350	$ 4,097					$ 3,696	$ 4,190	$ 4,146	$ 4,033	17,629	16,725	16,065
INCOME BEFORE INCOME TAXES	2,352	2,625	1,949	2,123					3,386	3,212	2,719	2,363	9,049	11,155	11,680
Income tax benefit	361	387	235	286					799	582	380	389	1,269	1,600	2,150
Net income	$ 1,991	$ 2,238	$ 1,714	$ 1,837	$ 548	$ 3,620	$ 2,924	$ 2,463	$ 2,587	$ 2,630	$ 2,339	$ 1,974	7,780	9,555	9,530
PRUDENTIAL BANCORP, INC. OF PENNSYLVANIA
PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY)
Equity in the undistributed earnings of the Bank													8,221	9,959	9,954
Total income including equity in earnings													8,221	9,959	9,954
Professional services													180	168	168
Other expense													378	344	369
Total expense													558	512	537
INCOME BEFORE INCOME TAXES													7,663	9,447	9,417
Income tax benefit													(117)	(108)	(113)
Net income													$ 7,780	$ 9,555	$ 9,530

PRUDENTIAL BANCORP, INC. (PAR_5

PRUDENTIAL BANCORP, INC. (PARENT COMPANY ONLY) - CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net income	$ 1,991	$ 2,238	$ 1,714	$ 1,837	$ 548	$ 3,620	$ 2,924	$ 2,463	$ 2,587	$ 2,630	$ 2,339	$ 1,974	$ 7,780	$ 9,555	$ 9,530
Financing Activities:
Purchase treasury stock													(5,391)	(10,534)	(3,108)
Cash dividends paid													(2,219)	(6,216)	(5,784)
Net decrease in cash and cash equivalents													(34,383)	69,113	(203)
CASH AND CASH EQUIVALENTS-Beginning of period				117,081				47,968				48,171	117,081	47,968	48,171
CASH AND CASH EQUIVALENTS-End of period	82,698				117,081				47,968				82,698	117,081	47,968
PRUDENTIAL BANCORP, INC. OF PENNSYLVANIA
Operating activities:
Net income													7,780	9,555	9,530
Other, net													(50)	52	(115)
Equity in the undistributed earnings of the Bank													(8,221)	(9,959)	(9,954)
Net cash used in operating activities													(491)	(352)	(539)
Financing Activities:
Purchase treasury stock													(5,391)	(10,481)	(3,108)
Cash dividends paid													(2,219)	(6,216)	(5,784)
Dividends from the Bank													8,000	17,000	5,000
Net cash provided by (used in) financing activities													390	303	(3,892)
Net decrease in cash and cash equivalents													(101)	(49)	(4,431)
CASH AND CASH EQUIVALENTS-Beginning of period				$ 955				$ 1,004				$ 5,435	955	1,004	5,435
CASH AND CASH EQUIVALENTS-End of period	$ 854				$ 955				$ 1,004				$ 854	$ 955	$ 1,004

CONSOLIDATED QUARTERLY FINANC_3

CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED)
Interest income	$ 9,544,000	$ 9,339,000	$ 9,464,000	$ 9,689,000	$ 9,599,000	$ 9,791,000	$ 11,010,000	$ 11,827,000	$ 11,631,000	$ 11,273,000	$ 11,134,000	$ 10,002,000	$ 38,037,000	$ 42,227,000	$ 44,040,000
Interest expense	3,486,000	3,566,000	3,740,000	4,006,000	4,233,000	4,486,000	5,222,000	5,484,000	5,434,000	5,058,000	4,811,000	3,986,000	14,798,000	19,425,000	19,289,000
NET INTEREST INCOME	6,058,000	5,773,000	5,724,000	5,683,000	5,366,000	5,305,000	5,788,000	6,343,000	6,197,000	6,215,000	6,323,000	6,016,000	23,239,000	22,802,000	24,751,000
Provision for loan losses	200,000				1,650,000	750,000	500,000	125,000	100,000				200,000	3,025,000	100,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	5,858,000	5,773,000	5,724,000	5,683,000	3,716,000	4,555,000	5,288,000	6,218,000	6,097,000	6,215,000	6,323,000	6,016,000	23,039,000	19,777,000	24,651,000
Non-interest income	1,132,000	1,395,000	575,000	537,000	841,000	3,762,000	2,668,000	832,000	985,000	1,187,000	542,000	380,000	3,639,000	8,103,000	3,094,000
Non-interest expense	4,638,000	4,543,000	4,350,000	4,097,000					3,696,000	4,190,000	4,146,000	4,033,000	17,629,000	16,725,000	16,065,000
Non-interest expense					4,248,000	3,996,000	4,460,000	4,021,000
INCOME BEFORE INCOME TAXES	2,352,000	2,625,000	1,949,000	2,123,000					3,386,000	3,212,000	2,719,000	2,363,000	9,049,000	11,155,000	11,680,000
INCOME BEFORE INCOME TAXES					309,000	4,321,000	3,496,000	3,029,000
Income tax expense	361,000	387,000	235,000	286,000					799,000	582,000	380,000	389,000	1,269,000	1,600,000	2,150,000
Income tax expense					(239,000)	701,000	572,000	566,000
NET INCOME	$ 1,991,000	$ 2,238,000	$ 1,714,000	$ 1,837,000	$ 548,000	$ 3,620,000	$ 2,924,000	$ 2,463,000	$ 2,587,000	$ 2,630,000	$ 2,339,000	$ 1,974,000	$ 7,780,000	$ 9,555,000	$ 9,530,000
Per share:
Earnings per share - basic (in dollars per share)	$ 0.25	$ 0.28	$ 0.22	$ 0.23	$ 0.07	$ 0.44	$ 0.33	$ 0.28	$ 0.30	$ 0.30	$ 0.27	$ 0.22	$ 0.98	$ 1.12	$ 1.09
Earnings per share - diluted (in dollars per share)	0.25	0.28	0.22	0.23	0.07	0.44	0.32	0.28	0.29	0.29	0.26	0.22	$ 0.98	$ 1.12	$ 1.07
Dividends per share (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.50	$ 0.07	$ 0.05	$ 0.50	$ 0.05	$ 0.05