ESSA Bancorp (ESSA) 10-Q 10 Aug 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2020	Aug. 07, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Trading Symbol	ESSA
Entity Registrant Name	ESSA Bancorp, Inc.
Entity Central Index Key	0001382230
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		10,950,575
Entity File Number	001-33384
Entity Tax Identification Number	20-8023072
Entity Address, Address Line One	200 Palmer Street
Entity Address, City or Town	Stroudsburg
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18360
City Area Code	(570)
Local Phone Number	421-0531
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	PA
Document Quarterly Report	true
Document Transition Report	false

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
ASSETS
Cash and due from banks	$ 159,983	$ 48,426
Interest-bearing deposits with other institutions	10,861	3,816
Total cash and cash equivalents	170,844	52,242
Investment securities available for sale, at fair value	295,228	313,393
Loans receivable (net of allowance for loan losses of $14,330 and $12,630)	1,423,132	1,328,653
Regulatory stock, at cost	18,581	11,579
Premises and equipment, net	14,286	14,335
Bank-owned life insurance	40,310	39,601
Foreclosed real estate	412	240
Intangible assets, net	858	1,066
Goodwill	13,801	13,801
Deferred income taxes	4,782	5,122
Other assets	26,883	19,395
TOTAL ASSETS	2,009,117	1,799,427
LIABILITIES
Deposits	1,484,835	1,342,830
Short-term borrowings	138,713	107,701
Other borrowings	150,827	140,581
Advances by borrowers for taxes and insurance	15,242	6,700
Other liabilities	25,815	12,107
TOTAL LIABILITIES	1,815,432	1,609,919
STOCKHOLDERS’ EQUITY
Preferred Stock ($0.01 par value; 10,000,000 shares authorized, none issued)
Common stock ($0.01 par value; 40,000,000 shares authorized, 18,133,095 issued; 10,960,357 and 11,321,417 outstanding at June 30, 2020 and September 30, 2019, respectively)	181	181
Additional paid in capital	181,366	181,161
Unallocated common stock held by the Employee Stock Ownership Plan (ESOP)	(7,463)	(7,803)
Retained earnings	109,912	102,465
Treasury stock, at cost; 7,172,738 and 6,811,678 shares outstanding at June 30, 2020 and September 30, 2019, respectively	(90,396)	(85,216)
Accumulated other comprehensive income (loss)	85	(1,280)
TOTAL STOCKHOLDERS’ EQUITY	193,685	189,508
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,009,117	$ 1,799,427

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Statement Of Financial Position [Abstract]
Allowance for loan losses	$ 14,330	$ 12,630
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	18,133,095	18,133,095
Common stock, shares outstanding	10,960,357	11,321,417
Treasury stock, shares outstanding	7,172,738	6,811,678

Consolidated Statement of Opera

Consolidated Statement of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST INCOME
Loans receivable, including fees	$ 13,763	$ 14,297	$ 41,958	$ 42,246
Investment securities:
Taxable	1,768	2,258	5,670	7,270
Exempt from federal income tax	45	57	141	287
Other investment income	277	388	941	1,194
Total interest income	15,853	17,000	48,710	50,997
INTEREST EXPENSE
Deposits	2,211	3,770	8,772	10,713
Short-term borrowings	588	673	1,582	2,922
Other borrowings	854	842	2,598	2,030
Total interest expense	3,653	5,285	12,952	15,665
NET INTEREST INCOME	12,200	11,715	35,758	35,332
Provision for loan losses	1,300	400	2,175	1,876
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	10,900	11,315	33,583	33,456
NONINTEREST INCOME
Service fees on deposit accounts	558	834	2,163	2,481
Services charges and fees on loans	325	288	985	894
Loan swap fees	627		1,200
Realized and unrealized gain (loss) on equity securities	2	2	(3)	3
Trust and investment fees	298	260	1,045	734
Gain on sale of investment securities available for sale, net		1	381	44
Gain on sale of loans, net	647		791
Earnings on Bank-owned life insurance	233	242	709	726
Insurance commissions	195	217	641	612
Other	(2)	18	102	562
Total noninterest income	2,883	1,862	8,014	6,056
NONINTEREST EXPENSE
Compensation and employee benefits	5,714	5,878	18,029	18,037
Occupancy and equipment	1,033	1,024	3,169	3,162
Professional fees	457	434	1,449	1,604
Data processing	1,113	925	3,215	2,758
Advertising	114	140	348	499
Federal Deposit Insurance Corporation (FDIC) premiums	154	238	492	607
(Gain) loss on foreclosed real estate	(5)	35	61	(69)
Amortization of intangible assets	68	74	208	235
Other	482	770	1,746	2,048
Total noninterest expense	9,130	9,518	28,717	28,881
Income before income taxes	4,653	3,659	12,880	10,631
Income taxes	876	612	2,286	1,716
NET INCOME	$ 3,777	$ 3,047	$ 10,594	$ 8,915
Earnings per share
Basic	$ 0.37	$ 0.29	$ 1.02	$ 0.83
Diluted	0.37	0.29	1.02	0.83
Dividends per share	$ 0.11	$ 0.10	$ 0.33	$ 0.30

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,777	$ 3,047	$ 10,594	$ 8,915
Investment securities available for sale:
Unrealized holding gain	1,091	4,089	6,763	14,011
Tax effect	(228)	(859)	(1,419)	(2,944)
Reclassification of gains recognized in net income		(1)	(381)	(44)
Tax effect			80	9
Net of tax amount	863	3,229	5,043	11,032
Derivative and hedging activities adjustments:
Changes in unrealized holding losses on derivatives included in net income	(2,353)	(1,034)	(4,705)	(2,097)
Tax effect	494	217	988	440
Reclassification adjustment for losses (gains) on derivatives included in net income	108	(258)	50	(746)
Tax effect	(23)	55	(11)	157
Net of tax amount	(1,774)	(1,020)	(3,678)	(2,246)
Total other comprehensive (loss) income	(911)	2,209	1,365	8,786
Comprehensive income	$ 2,866	$ 5,256	$ 11,959	$ 17,701

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Unallocated Common Stock Held by the ESOP [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Sep. 30, 2018	$ 179,186		$ 181	$ 180,765	$ (8,255)	$ 94,112		$ (77,707)	$ (9,910)
Beginning Balance, Shares at Sep. 30, 2018			11,782,718
Net income	8,915					8,915
Other comprehensive income (loss)	8,786								8,786
Cash dividends declared ($0.10 and $0.30 for 3 and 9 month ended June 30, 2019 and $0.11 and $0.33 for 3 and 9 months ended June 30, 2020 per share)	(3,217)					(3,217)
Stock based compensation	421			421
Allocation of ESOP stock	527			188	339
Allocation of treasury shares to incentive plan				(384)				384
Allocation of treasury shares to incentive plan, Shares			31,601
Reclassification of equity investment securities						(4)			4
Purchase of common stock	(6,541)							(6,541)
Purchase of common stock, Shares			(405,384)
Ending Balance at Jun. 30, 2019	188,077		$ 181	180,990	(7,916)	99,806		(83,864)	(1,120)
Ending Balance, Shares at Jun. 30, 2019			11,408,935
Beginning Balance at Mar. 31, 2019	183,637		$ 181	180,857	(8,029)	97,821		(83,864)	(3,329)
Beginning Balance, Shares at Mar. 31, 2019			11,408,935
Net income	3,047					3,047
Other comprehensive income (loss)	2,209								2,209
Cash dividends declared ($0.10 and $0.30 for 3 and 9 month ended June 30, 2019 and $0.11 and $0.33 for 3 and 9 months ended June 30, 2020 per share)	(1,062)					(1,062)
Stock based compensation	71			71
Allocation of ESOP stock	175			62	113
Ending Balance at Jun. 30, 2019	188,077		$ 181	180,990	(7,916)	99,806		(83,864)	(1,120)
Ending Balance, Shares at Jun. 30, 2019			11,408,935
Beginning Balance at Sep. 30, 2019	$ 189,508	$ 290	$ 181	181,161	(7,803)	102,465	$ 290	(85,216)	(1,280)
Beginning Balance, Shares at Sep. 30, 2019	11,321,417		11,321,417
Net income	$ 10,594					10,594
Other comprehensive income (loss)	1,365								1,365
Cash dividends declared ($0.10 and $0.30 for 3 and 9 month ended June 30, 2019 and $0.11 and $0.33 for 3 and 9 months ended June 30, 2020 per share)	$ (3,437)					(3,437)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Stock based compensation	$ 415			415
Allocation of ESOP stock	519			179	340
Allocation of treasury shares to incentive plan	(4)			(389)				385
Allocation of treasury shares to incentive plan, Shares			30,692
Purchase of common stock	(5,565)							(5,565)
Purchase of common stock, Shares			(391,752)
Ending Balance at Jun. 30, 2020	$ 193,685		$ 181	181,366	(7,463)	109,912		(90,396)	85
Ending Balance, Shares at Jun. 30, 2020	10,960,357		10,960,357
Beginning Balance at Mar. 31, 2020	$ 193,666		$ 181	181,218	(7,576)	107,265		(88,418)	996
Beginning Balance, Shares at Mar. 31, 2020			11,105,887
Net income	3,777					3,777
Other comprehensive income (loss)	(911)								(911)
Cash dividends declared ($0.10 and $0.30 for 3 and 9 month ended June 30, 2019 and $0.11 and $0.33 for 3 and 9 months ended June 30, 2020 per share)	(1,130)					(1,130)
Stock based compensation	82			82
Allocation of ESOP stock	148			35	113
Allocation of forfeited incentive shares				31				(31)
Allocation of forfeited incentive shares, Shares			(2,442)
Purchase of common stock	(1,947)							(1,947)
Purchase of common stock, Shares			(143,088)
Ending Balance at Jun. 30, 2020	$ 193,685		$ 181	$ 181,366	$ (7,463)	$ 109,912		$ (90,396)	$ 85
Ending Balance, Shares at Jun. 30, 2020	10,960,357		10,960,357

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash dividends declared, per share	$ 0.11	$ 0.10	$ 0.33	$ 0.30
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.11	$ 0.10	$ 0.33	$ 0.30

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES
Net income	$ 10,594	$ 8,915
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,175	1,876
Provision for depreciation and amortization	809	825
Amortization and accretion of discounts and premiums, net	1,485	2,255
Net gain on sale of investment securities, available for sale	(381)	(44)
Realized and unrealized loss (gain) on equity securities	3	(3)
Gain on sale of loans, net	(791)
Origination of residential real estate loans for sale	(19,112)
Proceeds on sale of residential real estate loans	19,903
Compensation expense on ESOP	519	527
Amortization of right-of-use asset	660
Stock based compensation	415	421
Increase in accrued interest receivable	(763)	(137)
(Decrease) increase in accrued interest payable	(173)	578
Earnings on bank-owned life insurance	(709)	(726)
Deferred federal income taxes	(23)	911
Decrease in accrued pension liability	(443)	(358)
Loss (gain) on foreclosed real estate, net	61	(69)
Amortization of intangible assets	208	235
Other, net	2,678	1,621
Net cash provided by operating activities	17,115	16,827
INVESTING ACTIVITIES
Certificate of deposit maturities		250
Proceeds from sale of investment securities	24,009	45,721
Proceeds from principal repayments and maturities	44,409	33,994
Purchases	(44,623)	(20,729)
Increase in loans receivable, net	(97,349)	(2,566)
Redemption of regulatory stock	8,166	14,201
Purchase of regulatory stock	(15,168)	(13,716)
Proceeds from sale of foreclosed real estate	111	1,020
Purchase of residential real estate loans		(22,298)
Purchase of premises, equipment and software	(871)	(551)
Net cash (used for) provided by investing activities	(81,316)	35,326
FINANCING ACTIVITIES
Increase (decrease) in deposits, net	142,005	(7,812)
Net increase (decrease) in short-term borrowings	31,012	(58,476)
Proceeds from other borrowings	55,661	89,600
Repayment of other borrowings	(45,415)	(75,650)
Increase in advances by borrowers for taxes and insurance	8,542	7,102
Purchase of treasury shares	(5,565)	(6,541)
Dividends on common stock	(3,437)	(3,217)
Net cash provided by (used for) financing activities	182,803	(54,994)
Increase (decrease) in cash and cash equivalents	118,602	(2,841)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	52,242	43,539
CASH AND CASH EQUIVALENTS AT END OF YEAR	170,844	40,698
Cash Paid:
Interest	13,125	15,087
Income taxes	8
Noncash items:
Transfers from loans to foreclosed real estate	344	315
Initial recognition of operating right-of-use asset	(7,272)
Initial recognition of operating lease liability	7,272
Unrealized holding gains	$ 6,383	$ 13,971

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	1. Nature of Operations and Basis of Presentation The consolidated financial statements include the accounts of ESSA Bancorp, Inc. (the “Company”), its wholly owned subsidiary, ESSA Bank & Trust (the “Bank”), and the Bank’s wholly owned subsidiaries, ESSACOR Inc.; Pocono Investments Company; ESSA Advisory Services, LLC; Integrated Financial Corporation; and Integrated Abstract Incorporated, a wholly owned subsidiary of Integrated Financial Corporation. The primary purpose of the Company is to act as a holding company for the Bank. The Bank’s primary business consists of the taking of deposits and granting of loans to customers generally in Monroe, Northampton, Lehigh, Delaware, Chester, Montgomery, Lackawanna, and Luzerne Counties, Pennsylvania. The Bank is a Pennsylvania chartered savings bank and is subject to regulation and supervision by the Pennsylvania Department of Banking and Securities and the Federal Deposit Insurance Corporation (the “FDIC”). The investment in the Bank on the parent company’s financial statements is carried at the parent company’s equity in the underlying net assets. ESSACOR, Inc. is a Pennsylvania corporation that has been used to purchase properties at tax sales that represent collateral for delinquent loans of the Bank and is currently inactive. Pocono Investment Company is a Delaware corporation formed as an investment company subsidiary to hold and manage certain investments, including certain intellectual property. ESSA Advisory Services, LLC is a Pennsylvania limited liability company owned 100 percent by ESSA Bank & Trust. ESSA Advisory Services, LLC is a full-service insurance benefits consulting company offering group services such as health insurance, life insurance, short-term and long-term disability, dental, vision, and 401(k) retirement planning as well as individual health products. Integrated Financial Corporation is a Pennsylvania corporation that provided investment advisory services to the general public and is currently inactive. Integrated Abstract Incorporated is a Pennsylvania corporation that provided title insurance services and is currently inactive. All significant intercompany accounts and transactions have been eliminated in consolidation. The unaudited consolidated financial statements reflect all adjustments, which in the opinion of management, are necessary for a fair presentation of the results of the interim periods and are of a normal and recurring nature. Operating results for the three and nine month periods ended June 30, 2020 and 2019 are not necessarily indicative of the results that may be expected for the year ending September 30, 2020.

Earnings per Share

Earnings per Share	9 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings per Share	2. Earnings per Share The following table sets forth the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computation for the three and nine month periods ended June 30, 2020 and 2019. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2020 2019 2020 2019 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (7,076,709 ) (6,724,160 ) (6,924,021 ) (6,498,995 ) Average unearned ESOP shares (741,156 ) (786,420 ) (752,513 ) (797,778 ) Average unearned non-vested shares (54,735 ) (48,107 ) (50,204 ) (48,562 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,260,495 10,574,408 10,406,357 10,787,760 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 234 — 257 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,260,729 10,574,408 10,406,614 10,787,760 At June 30, 2020 there were 42,520 shares of nonvested stock outstanding at an average weighted price of $16.15 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive. At June 30, 2019 there were 39,718 shares of nonvested stock outstanding at an average weighted price of $16.01 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive.

Use of Estimates in the Prepara

Use of Estimates in the Preparation of Financial Statements	9 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Use of Estimates in the Preparation of Financial Statements	3. Use of Estimates in the Preparation of Financial Statements The accounting principles followed by the Company and its subsidiaries and the methods of applying these principles conform to U.S. generally accepted accounting principles (“GAAP”) and to general practice within the banking industry. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the Consolidated Balance Sheet date and related revenues and expenses for the period. Actual results could differ from those estimates.

Accounting Pronouncements

Accounting Pronouncements	9 Months Ended
	Jun. 30, 2020
Accounting Changes And Error Corrections [Abstract]
Accounting Pronouncements	4. Accounting Pronouncements Adoption of New Standards In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Leases. The new leases standard requires a lessor to classify leases as either sales-type, direct financing or operating, similar to existing U.S. GAAP. Classification depends on the same five criteria used by lessees plus certain additional factors. The subsequent accounting treatment for all three lease types is substantially equivalent to existing U.S. GAAP for sales-type leases, direct financing leases, and operating leases. However, the new standard updates certain aspects of the lessor accounting model to align it with the new lessee accounting model, as well as with the new revenue standard under Topic 606. Lessees and lessors are required to provide certain qualitative and quantitative disclosures to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new leases standard addresses other considerations including identification of a lease, separating lease and non-lease components of a contract, sale and leaseback transactions, modifications, combining contracts, reassessment of the lease term, and re-measurement of lease payments. It also contains comprehensive implementation guidance with practical examples ASU 2016-02 was adopted by us on October 1, 2019 and initially required transition using a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842) “Leases (Topic 842) - Targeted Improvements,” ASU 2018-20, “Leases (Topic 842) - Narrow-Scope Improvements for Lessors,” Leases (Topic 842): Codification Improvements, Upon adoption of ASU 2016-02, ASU 2018-01, ASU 2018-11, ASU 2018-20, and ASU 2019-01 on October 1, 2019, we recognized right-of-use assets and related lease liabilities totaling $7.3 million and $7.3 million, respectively. We elected to apply certain practical expedients provided under ASU 2016-02 whereby we will not reassess (i) whether any expired or existing contracts are or contain leases, (ii) the lease classification for any expired or existing leases and (iii) initial direct costs for any existing leases. We also did not apply the recognition requirements of ASU 2016-02 to any short-term leases (as defined by related accounting guidance). We utilized the modified-retrospective transition approach prescribed by ASU 2018-11. Recent Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments periods beginning after December 15, 2018. With certain exceptions, transition to the new requirements will be through a cumulative effect adjustment to opening retained earnings as of the beginning of the first reporting period in which the guidance is adopted. In November 2019, the FASB issued ASU 2019-10, Financial Instruments ‒ Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) . This Update defers the effective date of ASU 2016-13 for SEC filers that are eligible to be smaller reporting companies, non-SEC filers, and all other companies to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. We expect to recognize a one-time cumulative effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes the Disclosure Requirements for Fair Value Measurements In August 2018, the FASB issued ASU 2018-14, Compensation – Retirement Benefits (Topic 715-20) In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging , and Topic 825, Financial Instruments , which affects a variety of topics in the Codification and applies to all reporting entities within the scope of the affected accounting guidance. Topic 326, Financial Instruments – Credit Losses amendments are effective for SEC registrants for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. For all other public business entities, the effective date is for fiscal years beginning after December 15, 2020, and for all other entities, the effective date is for fiscal years beginning after December 15, 2021. Topic 815, Derivatives and Hedging amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods beginning after December 15, 2020. For entities that have adopted the amendments in Update 2017-12, the effective date is as of the beginning of the first annual period beginning after the issuance of this Update. Topic 825, Financial Instruments amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations. 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 November 2019, the FASB issued ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments – Credit Losses In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740 In January 2020, the FASB issued ASU 2020-1, Investments – Equity Securities (Topic 321) that, for the purpose of applying paragraph 815-10-15-141(a) an entity should not consider whether, upon the settlement of the forward contract or exercise of the purchased option, individually or with existing investments, the underlying securities would be accounted for under the equity method in Topic 323 or the fair value option, in accordance with the financial instruments guidance in Topic 825. An entity also would evaluate the remaining characteristics in paragraph 815-10-15-141 to determine the accounting for those forward contracts and purchased options. For public business entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. This Update is not expected to have a significant impact on the Company’s financial statements. In January 2020, the FASB issued ASU 2020-2, Financial Instruments – Credit Losses (Topic 326) and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842), February 2020 In March 2020, the FASB issued ASU 2020-3 , Codification Improvements to Financial Instruments. Financial Instruments 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

Investment Securities

Investment Securities	9 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Investment Securities	5. The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands): June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 102,317 $ 3,432 $ (104 ) $ 105,645 Freddie Mac 72,970 2,421 (3 ) 75,388 Governmental National Mortgage Association 19,477 538 (88 ) 19,927 Total mortgage-backed securities 194,764 6,391 (195 ) 200,960 Obligations of states and political subdivisions 21,145 761 — 21,906 U.S. government agency securities 7,991 86 — 8,077 Corporate obligations 49,299 650 (571 ) 49,378 Other debt securities 14,626 436 (155 ) 14,907 Total $ 287,825 $ 8,324 $ (921 ) $ 295,228 September 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 126,672 $ 987 $ (554 ) $ 127,105 Freddie Mac 80,639 453 (331 ) 80,761 Governmental National Mortgage Association 18,590 182 (198 ) 18,574 Total mortgage-backed securities 225,901 1,622 (1,083 ) 226,440 Obligations of states and political subdivisions 19,860 356 (4 ) 20,212 U.S. government agency securities 6,454 234 — 6,688 Corporate obligations 43,121 594 (581 ) 43,134 Other debt securities 17,036 84 (201 ) 16,919 Total $ 312,372 $ 2,890 $ (1,869 ) $ 313,393 The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and nine months ended June 30, 2020 and 2019. (in thousands) Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Net gains recognized during the period on equity securities $ 2 $ 2 Less: Net gains recognized during the period on equity securities sold during the period — — Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 2 $ 2 (in thousands) Nine Months Ended June 30, 2020 Nine Months Ended June 30, 2019 Net (losses) gains recognized during the period on equity securities $ (3 ) $ 3 Less: Net gains recognized during the period on equity securities sold during the period — — Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date $ (3 ) $ 3 The amortized cost and fair value of debt securities at June 30, 2020, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties (in thousands): Available For Sale Amortized Cost Fair Value Due in one year or less $ 2,045 $ 2,045 Due after one year through five years 23,428 23,833 Due after five years through ten years 83,329 85,008 Due after ten years 179,023 184,342 Total $ 287,825 $ 295,228 For the three months ended June 30, 2020, the Company realized no gross gains or gross losses on proceeds from the sale of investment securities. For the nine months ended June 30, 2020, the Company realized gross gains of $420,000 and gross losses of $39,000 on proceeds from the sale of investment securities of $24.0 million. For the three months ended June 30, 2019, the Company realized gross gains of $93,000 and gross losses of $92,000 on proceeds from the sale on investment securities of $15.3 million. For the nine months ended June 30, 2019, the Company realized gross gains of $268,000 and gross losses of $224,000 on proceeds from the sale on investment securities of $45.7 million. The following tables show the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands): June 30, 2020 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 10 $ 2,470 $ (31 ) $ 6,406 $ (73 ) $ 8,876 $ (104 ) Freddie Mac 1 348 (3 ) — — 348 (3 ) Governmental National Mortgage Association 6 3,981 (55 ) 3,606 (33 ) 7,587 (88 ) Corporate obligations 21 12,651 (151 ) 7,594 (420 ) 20,245 (571 ) Other debt securities 10 — — 3,985 (155 ) 3,985 (155 ) Total 48 $ 19,450 $ (240 ) $ 21,591 $ (681 ) $ 41,041 $ (921 ) September 30, 2019 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 48 $ 5,568 $ (6 ) $ 45,867 $ (548 ) $ 51,435 $ (554 ) Freddie Mac 32 765 — 29,661 (331 ) 30,426 (331 ) Governmental National Mortgage Association 12 345 (1 ) 8,242 (197 ) 8,587 (198 ) Obligations of states and political subdivisions 2 2,159 (4 ) — — 2,159 (4 ) Corporate obligations 13 2,063 (5 ) 12,015 (576 ) 14,078 (581 ) Other debt securities 14 3,493 (16 ) 6,132 (185 ) 9,625 (201 ) Total 121 $ 14,393 $ (32 ) $ 101,917 $ (1,837 ) $ 116,310 $ (1,869 ) The Company’s investment securities portfolio contains unrealized losses on securities, including mortgage-related instruments issued or backed by the full faith and credit of the United States government, or generally viewed as having the implied guarantee of the U.S. government, other mortgage backed securities, debt obligations of a U.S. state or political subdivision, U.S. government agency securities, corporate obligations, other debt securities and equity securities. The Company reviews its position quarterly and has asserted that at June 30, 2020, the declines outlined in the above table represent temporary declines and the Company would not be required to sell the above securities before their anticipated recovery in market value. The Company has concluded that any impairment of its investment securities portfolio is not other than temporary but is the result of interest rate changes that are not expected to result in the non-collection of principal and interest during the period.

Loans Receivable, Net and Allow

Loans Receivable, Net and Allowance for Loan Losses	9 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Loans Receivable, Net and Allowance for Loan Losses	6. Loans Receivable, Net and Allowance for Loan Losses Loans receivable consist of the following (in thousands): June 30, 2020 September 30, 2019 Real estate loans: Residential $ 605,307 $ 597,514 Construction 10,305 5,672 Commercial 508,056 480,647 Commercial 142,489 55,559 Obligations of states and political subdivisions 77,792 71,828 Home equity loans and lines of credit 42,159 45,156 Auto loans 48,920 81,983 Other 2,434 2,924 1,437,462 1,341,283 Less allowance for loan losses 14,330 12,630 Net loans $ 1,423,132 $ 1,328,653 Included in Commercial loans in the above table are 637 loans totaling $75.6 million originated by the Company under the Payroll Protection Program during the quarter ended June 30, 2020. These loans are guaranteed by the Small Business Administration and mature in two years. Purchased loans acquired in a business combination are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): June 30, 2020 September 30, 2019 Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 1,198 $ 1,392 Carrying amount $ 1,112 $ 1,299 The following tables show the amount of loans in each category that were individually and collectively evaluated for impairment at the dates indicated (in thousands): Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment June 30, 2020 Real estate loans: Residential $ 605,307 $ 3,951 $ — $ 601,356 Construction 10,305 — — 10,305 Commercial 508,056 11,479 1,112 495,465 Commercial 142,489 2,480 — 140,009 Obligations of states and political subdivisions 77,792 — — 77,792 Home equity loans and lines of credit 42,159 271 — 41,888 Auto loans 48,920 139 — 48,781 Other 2,434 13 — 2,421 Total $ 1,437,462 $ 18,333 $ 1,112 $ 1,418,017 Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment September 30, 2019 Real estate loans: Residential $ 597,514 $ 4,281 $ — $ 593,233 Construction 5,672 — — 5,672 Commercial 480,647 2,633 1,299 476,715 Commercial 55,559 448 — 55,111 Obligations of states and political sub divisions 71,828 — — 71,828 Home equity loans and lines of credit 45,156 400 — 44,756 Auto loans 81,983 583 — 81,400 Other 2,924 31 — 2,893 Total $ 1,341,283 $ 8,376 $ 1,299 $ 1,331,608 The Company maintains a loan review system that allows for a periodic review of our loan portfolio and the early identification of potential impaired loans. Such system takes into consideration, among other things, delinquency status, size of loans, type and market value of collateral and financial condition of the borrowers. Specific loan loss allowances are established for identified losses based on a review of such information. A loan evaluated for impairment is considered to be impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. All loans identified as impaired are evaluated independently. The Company does not aggregate such loans for evaluation purposes. Impairment is measured on a loan-by-loan basis for commercial and construction loans by the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral if the loan is collateral-dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Accordingly, the Company does not separately identify individual consumer and residential mortgage loans for impairment disclosures, unless such loans are part of a larger relationship that is impaired, or are classified as a troubled debt restructuring. A loan is considered to be a troubled debt restructuring (“TDR”) loan when the Company grants a concession to the borrower that it would not otherwise consider because of the borrower’s financial condition. Such concessions include the reduction of interest rates, forgiveness of principal or interest, or other modifications of interest rates that are less than the current market rate for new obligations with similar risk. TDR loans that are in compliance with their modified terms and that yield a market rate at the time of modification may be removed from TDR status after one year of performance. The following tables include the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount at the dates indicated, if applicable (in thousands): Recorded Investment Unpaid Principal Balance Associated Allowance June 30, 2020 With no specific allowance recorded: Real estate loans Residential $ 3,563 $ 4,691 $ — Construction — — — Commercial 11,257 12,676 — Commercial 2,312 2,388 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 252 347 — Auto loans 46 120 — Other 13 53 — Total 17,443 20,275 — With an allowance recorded: Real estate loans Residential 388 423 28 Construction — — — Commercial 222 910 40 Commercial 168 168 82 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 19 40 — Auto loans 93 99 42 Other — — — Total 890 1,640 192 Total: Real estate loans Residential 3,951 5,114 28 Construction — — — Commercial 11,479 13,586 40 Commercial 2,480 2,556 82 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 271 387 — Auto loans 139 219 42 Other 13 53 — Total Impaired Loans $ 18,333 $ 21,915 $ 192 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2019 With no specific allowance recorded: Real Estate Loans Residential $ 3,935 $ 5,309 $ — Construction — — — Commercial 2,385 4,269 — Commercial 354 475 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 400 465 — Auto Loans 161 248 — Other 15 22 — Total 7,250 10,788 — With an allowance recorded: Real Estate Loans Residential 346 398 36 Construction — — — Commercial 248 294 56 Commercial 94 223 6 Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 422 426 144 Other 16 17 6 Total 1,126 1,358 248 Total: Real Estate Loans Residential 4,281 5,707 36 Construction — — — Commercial 2,633 4,563 56 Commercial 448 698 6 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 400 465 — Auto Loans 583 674 144 Other 31 39 6 Total Impaired Loans $ 8,376 $ 12,146 $ 248 The following table represent s the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired (in thousands): For the Three Months Ended June 30, 2020 2019 2020 2019 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,602 $ 3,451 $ 1 $ 1 Construction — — — — Commercial 5,108 3,856 — — Commercial 2,323 460 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 244 231 — — Auto loans 74 130 — 1 Other 13 5 — — Total 11,364 8,133 1 2 With an allowance recorded: Real estate loans Residential 361 574 — — Construction — — — — Commercial 182 291 — — Commercial 168 823 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 6 10 — — Auto loans 85 202 — — Other — — — — Total 802 1,900 — — Total: Real estate loans Residential 3,963 4,025 1 1 Construction — — — — Commercial 5,290 4,147 — — Commercial 2,491 1,283 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 250 241 — — Auto loans 159 332 — 1 Other 13 5 — — Total Impaired Loans $ 12,166 $ 10,033 $ 1 $ 2 For the Nine Months Ended June 30, 2020 2019 2020 2019 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,800 $ 3,728 $ 2 $ 4 Construction — — — — Commercial 3,203 3,425 1 54 Commercial 1,260 250 4 1 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 253 204 — — Auto loans 130 101 1 2 Other 14 13 — — Total 8,660 7,721 8 61 With an allowance recorded: Real estate loans Residential 304 846 — — Construction — — — — Commercial 239 126 — — Commercial 97 285 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 2 19 — — Auto loans 128 219 — — Other 8 — — — Total 778 1,495 — — Total: Real estate loans Residential 4,104 4,574 2 4 Construction — — — — Commercial 3,442 3,551 1 54 Commercial 1,357 535 4 1 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 255 223 — — Auto loans 258 320 1 2 Other 22 13 — — Total Impaired Loans $ 9,438 $ 9,216 $ 8 $ 61 The Company uses a ten-point internal risk-rating system to monitor the credit quality of the overall loan portfolio. The first six categories are considered not criticized and are aggregated as Pass-rated. The criticized rating categories utilized by management generally follow bank regulatory definitions. The Special Mention category includes assets that are fundamentally sound yet exhibit potentially unacceptable credit risk or deteriorating trends or characteristics which, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans in the Substandard category have well-defined weaknesses that jeopardize the liquidation of the debt and have a distinct possibility that some loss will be sustained if the weaknesses are not corrected. All loans that are 90 or more days past due are considered Substandard. Loans in the Doubtful category have all the weaknesses inherent in loans classified as Substandard with the added characteristic that their weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loans in the Loss category are considered uncollectible and of little value that their continuance as bankable assets is not warranted. Certain residential real estate loans, construction loans, home equity loans and lines of credit, auto loans and other consumer loans are underwritten and structured using standardized criteria and characteristics, primarily payment performance, and are normally risk rated and monitored collectively on a monthly basis. These are typically loans to individuals in the consumer categories and are delineated as either performing or non-performing. To help ensure that risk ratings are accurate and reflect the present and future capacity of borrowers to repay a loan as agreed, the Bank has a structured loan rating process with several layers of internal and external oversight. Generally, consumer and residential mortgage loans are included in the Pass categories unless a specific action, such as bankruptcy, repossession, or death occurs to raise awareness of a possible credit event. The Bank’s commercial loan officers are responsible for the timely and accurate risk rating recommendation for the loans in their portfolios at origination and on an ongoing basis. The Bank’s commercial loan officers perform an annual review of all commercial relationships $750,000 or greater. Confirmation of the appropriate risk grade is included in the review on an ongoing basis. The Bank engages an external consultant to conduct loan reviews on at least a semi-annual basis. Generally, the external consultant reviews commercial relationships greater than $1,000,000 and/or all criticized relationships. Detailed reviews, including plans for resolution, are performed on loans classified as Substandard on a quarterly basis. Loans in the Special Mention and Substandard categories that are collectively evaluated for impairment are given separate consideration in the determination of the allowance. The following tables present the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful or Loss within the internal risk rating system at June 30, 2020 and September 30, 2019 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2020 Commercial real estate loans $ 487,303 $ 6,683 $ 14,070 $ — $ 508,056 Commercial 139,855 — 2,634 — 142,489 Obligations of states and political subdivisions 77,792 — — — 77,792 Total $ 704,950 $ 6,683 $ 16,704 $ — $ 728,337 Pass Special Mention Substandard Doubtful or Loss Total September 30, 2019 Commercial real estate loans $ 461,701 $ 7,492 $ 11,454 $ — $ 480,647 Commercial 52,486 — 3,073 — 55,559 Obligations of states and political subdivisions 71,828 — — — 71,828 Total $ 586,015 $ 7,492 $ 14,527 $ — $ 608,034 All other loans are underwritten and structured using standardized criteria and characteristics, primarily payment performance, and are normally risk rated and monitored collectively on a monthly basis. These are typically loans to individuals in the consumer categories and are delineated as either performing or non-performing. The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2020 and September 30, 2019 (in thousands): Performing Non- performing Total June 30, 2020 Real estate loans: Residential $ 600,891 $ 4,416 $ 605,307 Construction 10,305 — 10,305 Home equity loans and lines of credit 41,806 353 42,159 Auto loans 48,753 167 48,920 Other 2,421 13 2,434 Total $ 704,176 $ 4,949 $ 709,125 Performing Non- performing Total September 30, 2019 Real estate loans: Residential $ 592,907 $ 4,607 $ 597,514 Construction 5,672 — 5,672 Home equity loans and lines of credit 44,534 622 45,156 Auto loans 81,317 666 81,983 Other 2,883 41 2,924 Total $ 727,313 $ 5,936 $ 733,249 The Company 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 past due. The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of June 30, 2020 and September 30, 2019 (in thousands): 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans June 30, 2020 Real estate loans: Residential $ 598,797 $ 1,259 $ 835 $ — $ 4,416 $ 6,510 $ — $ — $ 605,307 Construction 10,305 — — — — — — — 10,305 Commercial 495,110 89 334 — 11,411 $ 11,834 236 876 508,056 Commercial 139,495 31 130 — 2,833 $ 2,994 — — 142,489 Obligations of states and political subdivisions 77,792 — — — — — — — 77,792 Home equity loans and lines of credit 41,625 68 113 — 353 534 — — 42,159 Auto loans 48,048 687 18 — 167 872 — — 48,920 Other 2,408 — 13 — 13 26 — — 2,434 Total $ 1,413,580 $ 2,134 $ 1,443 $ — $ 19,193 $ 22,770 $ 236 $ 876 $ 1,437,462 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans September 30, 2019 Real estate loans: Residential $ 590,457 $ 2,187 $ 263 $ — $ 4,607 $ 7,057 $ — $ — $ 597,514 Construction 5,672 — — — — — — — 5,672 Commercial 476,644 236 — — 2,468 2,704 243 1,056 480,647 Commercial 54,899 20 37 — 603 660 — — 55,559 Obligations of states and political subdivisions 71,828 — — — — — — — 71,828 Home equity loans and lines of credit 44,319 47 168 — 622 837 — — 45,156 Auto loans 80,090 1,227 — — 666 1,893 — — 81,983 Other 2,883 — — — 41 41 — — 2,924 Total $ 1,326,792 $ 3,717 $ 468 $ — $ 9,007 $ 13,192 $ 243 $ 1,056 $ 1,341,283 The allowance for loan losses is maintained at a level necessary to absorb loan losses that are both probable and reasonably estimable. Management, in determining the allowance for loan losses, considers the losses inherent in its loan portfolio and changes in the nature and volume of loan activities, along with the general economic and real estate market conditions. The allowance for loan losses consists of two elements: (1) an allocated allowance, which comprises allowances established on specific loans and class allowances based on historical loss experience and current trends, and (2) an unallocated allowance based on general economic conditions and other risk factors in our markets and portfolios. We maintain a loan review system, which allows for a periodic review of our loan portfolio and the early identification of potential impaired loans. Such system takes into consideration, among other things, delinquency status, size of loans, type and market value of collateral and financial condition of the borrowers. General loan loss allowances are based upon a combination of factors including, but not limited to, actual loan loss experience, composition of the loan portfolio, current economic conditions, management’s judgment and losses which are probable and reasonably estimable. In addition, for the three and nine months ended June 30, 2020, consideration was given and a credit provision was recorded for loans granted short term payment relief. The allowance is increased through provisions charged against current earnings and recoveries of previously charged-off loans. Loans that are determined to be uncollectible are charged against the allowance. While management uses available information to recognize probable and reasonably estimable loan losses, future loss provisions may be necessary, based on changing economic conditions. Payments received on impaired loans generally are either applied against principal or reported as interest income, according to management’s judgment as to the collectability of principal. The allowance for loan losses as of June 30, 2020 was maintained at a level that represents management’s best estimate of losses inherent in the loan portfolio, and such losses were both probable and reasonably estimable. In addition, the FDIC and the Pennsylvania Department of Banking and Securities, as an integral part of their examination process, have periodically reviewed our allowance for loan losses. The banking regulators may require that we recognize additions to the allowance based on its analysis and review of information available to it at the time of its examination. Management reviews the loan portfolio on a quarterly basis using a defined, consistently applied process in order to make appropriate and timely adjustments to the allowance for loan losses (“ALL”). When information confirms all or part of specific loans to be uncollectible, these amounts are promptly charged off against the ALL. The following table summarizes changes in the primary segments of the ALL for the three and nine months ended June 30, 2020 and 2019 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total ALL balance at March 31, 2020 $ 4,330 $ 55 $ 4,563 $ 2,180 $ 359 $ 351 $ 1,104 $ 29 $ 208 $ 13,179 Charge-offs (42 ) — (4 ) — — (21 ) (135 ) (15 ) — (217 ) Recoveries 1 — 17 — — 1 49 0 — 68 Provision 78 48 2,294 (1,206 ) 185 5 (55 ) 10 (59 ) 1,300 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 ALL balance at March 31, 2019 $ 3,742 $ 59 $ 3,816 $ 1,865 $ 294 $ 295 $ 1,608 $ 27 $ 683 $ 12,389 Charge-offs (49 ) — (114 ) (5 ) — — (229 ) — — (397 ) Recoveries 23 — 18 — — 2 170 1 — 214 Provision 313 — (96 ) 41 44 31 (21 ) (1 ) 89 400 ALL balance at June 30, 2019 $ 4,029 $ 59 $ 3,624 $ 1,901 $ 338 $ 328 $ 1,528 $ 27 $ 772 $ 12,606 ALL balance at September 30, 2019 $ 4,243 $ 53 $ 3,806 $ 1,870 $ 343 $ 329 $ 1,384 $ 28 $ 574 $ 12,630 Charge-offs (72 ) — (54 ) — — (61 ) (717 ) (20 ) — (924 ) Recoveries 7 — 77 1 — 4 358 2 — 449 Provision 189 50 3,041 (897 ) 201 64 (62 ) 14 (425 ) 2,175 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 ALL balance at September 30, 2018 $ 3,605 $ 35 $ 3,458 $ 1,462 $ 323 $ 296 $ 1,859 $ 23 $ 627 $ 11,688 Charge-offs (322 ) — (121 ) (27 ) — (19 ) (967 ) (11 ) — (1,467 ) Recoveries 32 — 30 — — 5 439 3 — 509 Provision 714 24 257 466 15 46 197 12 145 1,876 ALL balance at June 30, 2019 $ 4,029 $ 59 $ 3,624 $ 1,901 $ 338 $ 328 $ 1,528 $ 27 $ 772 $ 12,606 During the three months ended June 30, 2020 the Company recorded provision expense for the residential real estate loans, commercial real estate loans, obligations of states and political subdivisions, construction loans, home equity loans and lines of credit and other loan segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Provision expense was also recorded for possible loan losses due to the economic slowdown caused by COVID-19 restrictions. Credit provisions were recorded for loan loss for the commercial loans and auto loan segments. During the nine months ended June 30, 2020 the Company recorded provision expense for the residential real estate loans, commercial real estate loans, obligations of states and political subdivisions, construction loans, home equity loans and lines of credit and other loan segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Provision expense was also recorded for possible loan losses due to the economic slowdown caused by COVID-19 restrictions. Credit provisions were recorded for loan loss for the commercial loans and auto loan segments. During the three months ended June 30, 2019 the Company recorded provision expense for the residential real estate, construction loans, commercial, obligations of states and political subdivisions and home equity loans and lines of credit, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Credit provisions were recorded for loan loss for the commercial real estate, auto and other loan segments. During the nine months ended June 30, 2019 the Company recorded provision expense for the all loans segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. The Company is closely monitoring all customer credit positions, particularly loans requesting payment relief. Such loans, as of June 30, 2020 amounted to approximately 12.4% of total loans outstanding, including $144.6 million in commercial real estate loans, $5.5 in commercial loans, $27.8 million in mortgage loans, $687,000 in auto loans. As the economic slowdown continues to evolve due to COVID-19 restrictions, our customers may experience decreased cash flows, which may correlate to an inability to make timely loan payments. This, in turn may require further increases in our allowance for loan losses and increases in the level of charge-offs in our loan portfolio. The following table summarizes the primary segments of the ALL, segregated into two categories, the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2020 and September 30, 2019 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total Individually evaluated for impairment $ 28 $ — $ 40 $ 82 $ — $ — $ 42 $ — $ — $ 192 Collectively evaluated for impairment 4,339 103 6,830 892 544 336 921 24 149 14,138 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 Individually evaluated for impairment $ 36 $ — $ 56 $ 6 $ — $ — $ 144 $ 6 $ — $ 248 Collectively evaluated for impairment 4,207 53 3,750 1,864 343 329 1,240 22 574 12,382 ALL balance at September 30, 2019 $ 4,243 $ 53 $ 3,806 $ 1,870 $ 343 $ 329 $ 1,384 $ 28 $ 574 $ 12,630 The allowance for loan losses is based on estimates, and actual losses will vary from current estimates. Management believes that the granularity of the homogeneous pools and the related historical loss ratios and other qualitative factors, as well as the consistency in the application of assumptions, result in an ALL that is representative of the risk found in the components of the portfolio at any given date. Despite the above allocations, the allowance for loan losses is general in nature and is available to absorb losses from any loan segment. The following is a summary of troubled debt restructuring granted during the nine months ended June 30, 2020 and 2019 (dollars in thousands): For the Nine Months Ended June 30, 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 1 $ 534 $ 534 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans — — — Other — — — Total 1 $ 534 $ 534 For the Nine Months Ended June 30, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 95 $ 95 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 2 159 159 Auto loans 1 21 21 Other — — — Total 5 $ 275 $ 275 There were no new troubled debt restructurings granted for the three months ended June 30, 2020 and 2019. The one new troubled debt restructuring granted for the nine months ended June 30, 2020, totaled $534,000 and was granted an interest rate concession. Of the five new troubled debt restructurings granted for the nine months ended June 30, 2019, one loan totaling $14,000 was granted terms concessions, one loan totaling $81,000 was granted an interest rate concession, and three loans totaling $180,000 were granted term and rate concessions. For the three and nine months ended June 30, 2020 and 2019, no loans defaulted on a restructuring agreement within one year of modification. As of June 30, 2020, approximately 222 of our commercial clients had requested loan payment deferrals or payments of interest only on loans totaling $150.1 million. We have had similar request from approximately 169 mortgage customers and approximately 55 auto loan customers. In accordance with interagency guidance issued in March 2020, these short-term deferrals are not considered troubled debt restructurings (“TDRs”) unless the borrower was previously experiencing financial difficulty. In addition, the risk-rating on COVID-19 modified loans did not change, and these loans will not be considered past due until after the deferral period is over and scheduled payments resume. The credit quality of these loans will be reevaluated after the deferral period ends. At June 30, 2020, our non-performing assets were not yet materially impacted by the economic pressures of COVID-19, although there can be no assurance that our non-performing assets will not increase in the future. In addition, we will continue to closely monitor credit risk and our exposure to increased loan losses resulting from the impact of COVID-19 on our commercial and consumer clients. .

Deposits

Deposits	9 Months Ended
	Jun. 30, 2020
Deposits Liabilities Disclosures [Abstract]
Deposits	7. Deposits Deposits consist of the following major classifications (in thousands): June 30, 2020 September 30, 2019 Non-interest bearing demand accounts $ 235,783 $ 175,932 Interest bearing demand accounts 238,426 224,673 Money market accounts 351,463 364,635 Savings and club accounts 159,043 135,012 Certificates of deposit 500,120 442,578 Total $ 1,484,835 $ 1,342,830

Net Periodic Benefit Cost-Defin

Net Periodic Benefit Cost-Defined Benefit Plan	9 Months Ended
	Jun. 30, 2020
Compensation And Retirement Disclosure [Abstract]
Net Periodic Benefit Cost-Defined Benefit Plan	8 . Net Periodic Benefit Cost-Defined Benefit Plan For a detailed disclosure on the Bank’s pension and employee benefits plans, please refer to Note 12 of the Company’s Consolidated Financial Statements for the year ended September 30, 2019 included in the Company’s Annual Report on Form 10-K. The following table comprises the components of net periodic benefit cost for the three and nine month periods ended June 30, 2020 and 2019 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2020 2019 2020 2019 Service Cost $ — $ — $ — $ — Interest Cost 121 174 364 520 Expected return on plan assets (268 ) (293 ) (807 ) (878 ) Amortization of unrecognized loss — — — — Net periodic benefit cost $ (147 ) $ (119 ) $ (443 ) $ (358 ) The Company’s board of directors adopted resolutions to freeze the status of the Defined Benefit Plan (“the plan”) effective February 28, 2017 (“the freeze date”). Accordingly, no additional participants will enter the plan after February 28, 2017; no additional years of service for benefit accrual purposes will be credited after the freeze date under the plan; and compensation earned by participants after the freeze date will not be taken into account under the plan.

Equity Incentive Plan

Equity Incentive Plan	9 Months Ended
	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Incentive Plan	9 . Equity Incentive Plan The Company previously maintained the ESSA Bancorp, Inc. 2007 Equity Incentive Plan (the “Plan”). The Plan provided for a total of 2,377,326 shares of common stock for issuance upon the grant or exercise of awards. Of the shares that were available under the Plan, 1,698,090 were available to be issued in connection with the exercise of stock options and 679,236 were available to be issued as restricted stock. The Plan allowed for the granting of non-qualified stock options (“NSOs”), incentive stock options (“ISOs”), and restricted stock. Options granted under the plan were granted at no less than the fair value of the Company’s common stock on the date of the grant. As of the effective date of the 2016 Equity Incentive Plan (detailed below), no further grants will be made under the Plan and forfeitures of outstanding awards under the Plan will be added to the shares available under the 2016 Equity Incentive Plan. The Company replaced the 2007 Equity Incentive Plan with the ESSA Bancorp, Inc. 2016 Equity Incentive Plan (the “2016 Plan”) which was approved by shareholders on March 3, 2016. The 2016 Plan provides for a total of 250,000 shares of common stock for issuance upon the grant or exercise of awards. The 2016 Plan allows for the granting of restricted stock, restricted stock units, ISOs and NSOs. The Company classifies share-based compensation for employees and outside directors within “Compensation and employee benefits” in the Consolidated Statement of Operations to correspond with the same line item as compensation paid. Restricted stock shares outstanding at June 30, 2020 vest over periods ranging from 3 to 39 months. The product of the number of shares granted and the grant date market price of the Company’s common stock determines the fair value of restricted shares under the Company’s restricted stock plan. The Company expenses the fair value of all share based compensation grants over the requisite service period. For the three months ended June 30, 2020 and 2019, the Company recorded $82,000 and $71,000 of share-based compensation expense, respectively, comprised of restricted stock expense. For the nine months ended June 30, 2020 and 2019, the Company recorded $415,000 and $421,000 of share-based compensation expense, respectively, comprised of restricted stock expense. Expected future compensation expense relating to the restricted shares outstanding at June 30, 2020 is $649,000 over the remaining vesting period of 3.25 years. The following is a summary of the status of the Company’s restricted stock as of June 30, 2020, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2019 34,963 $ 16.13 Granted 33,367 16.19 Vested (8,819 ) 16.25 Forfeited (2,442 ) — Nonvested at June 30, 2020 57,069 $ 16.17

Fair Value

Fair Value	9 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value	10. Fair Value The following disclosures show the hierarchal disclosure framework associated within the level of pricing observations utilized in measuring assets and liabilities at fair value. The definition of fair value maintains the exchange price notion in earlier definitions of fair value but focuses on the exit price of the asset or liability. The exit price is the price that would be received to sell the asset or paid to transfer the liability adjusted for certain inherent risks and restrictions. Expanded disclosures are also required about the use of fair value to measure assets and liabilities. Assets and Liabilities Required to be Measured and Reported at Fair Value on a Recurring Basis The following tables provide the fair value for assets and liabilities required to be measured and reported at fair value on a recurring basis on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 by level within the fair value hierarchy (in thousands). Recurring Fair Value Measurements at Reporting Date June 30, 2020 Assets Level I Level II Level III Total Investment securities available for sale: Mortgage backed securities $ — $ 200,960 $ — $ 200,960 Obligations of states and political subdivisions — 21,906 — 21,906 U.S. government agencies — 8,077 — 8,077 Corporate obligations — 42,591 6,787 49,378 Other debt securities — 14,907 — 14,907 Total Debt Securities $ — $ 288,441 $ 6,787 $ 295,228 Equity securities- financial services 23 — — 23 Derivatives and hedging activities — 2,232 — 2,232 Liabilities Derivatives and hedging activities — 7,609 — 7,609 September 30, 2019 Level I Level II Level III Total Investment securities available for sale: Mortgage backed securities $ — $ 226,440 $ — $ 226,440 Obligations of states and political subdivisions — 20,212 — 20,212 U.S. government agencies — 6,688 — 6,688 Corporate obligations — 35,342 7,792 43,134 Other debt securities — 16,919 — 16,919 Total debt securities $ — $ 305,601 $ 7,792 $ 313,393 Equity securities-financial services 25 — — 25 Derivatives and hedging activities — 303 — 303 Liabilities: Derivatives and hedging activities — 1,011 — 1,011 The following table presents a summary of changes in the fair value of the Company’s Level III investments for the three and nine month periods ended June 30, 2020 and 2019 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2020 June 30, 2019 Beginning balance $ 7,821 $ 7,733 Purchases, sales, issuances, settlements, net (1,000 ) — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (loss) (34 ) 89 Transfers in and/or out of Level III — — $ 6,787 $ 7,822 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2020 June 30, 2019 Beginning balance $ 7,792 $ 7,738 Purchases, sales, issuances, settlements, net (1,000 ) — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive (loss) income (5 ) 84 Transfers in and/or out of Level III — — $ 6,787 $ 7,822 Each financial asset and liability is identified as having been valued according to a specified level of input, 1, 2 or 3. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Fair values determined by Level 2 inputs utilize inputs other than quoted prices included in Level 1 that are observable for the asset, either directly or indirectly. Level 2 inputs include quoted prices for similar assets in active markets, and inputs other than quoted prices that are observable for the asset or liability. Level 3 inputs are unobservable inputs for the asset, and include situations where there is little, if any, market activity for the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy, within which the fair value measurement in its entirety falls, has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset. The measurement of fair value should be consistent with one of the following valuation techniques: market approach, income approach, and/or cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities (including a business). For example, valuation techniques consistent with the market approach often use market multiples derived from a set of comparable. Multiples might lie in ranges with a different multiple for each comparable. The selection of where within the range the appropriate multiple falls requires judgment, considering factors specific to the measurement (qualitative and quantitative). Valuation techniques consistent with the market approach include matrix pricing. Matrix pricing is a mathematical technique used principally to value debt securities without relying exclusively on quoted prices for the specific securities, but rather by relying on a security’s relationship to other benchmark quoted securities. Most of the securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quoted market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Securities reported at fair value utilizing Level 1 inputs are limited to actively traded equity securities whose market price is readily available from the New York Stock Exchange or the NASDAQ exchange. A few securities are valued using Level 3 inputs, all of these are classified as available for sale and are reported at fair value using Level 3 inputs. Assets and Liabilities Required to be Measured and Reported on a Non-Recurring Basis The following tables provide the fair value for assets required to be measured and reported at fair value on a non recurring basis on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 by level within the fair value hierarchy: Non-Recurring Fair Value Measurements at Reporting Date (in thousands) June 30, 2020 Level I Level II Level III Total Foreclosed real estate $ — $ — $ 412 $ 412 Impaired loans — — 18,141 18,141 September 30, 2019 Level I Level II Level III Total Foreclosed real estate $ — $ — $ 240 $ 240 Impaired loans — — 8,128 8,128 The following tables present additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (dollars in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2020 Impaired loans $ 18,141 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (20.6%) Foreclosed real estate owned 412 Appraisal of collateral (1) Appraisal adjustments (2) 20% to 46% (25.1%) Quantitative Information about Level 3 Fair Value Measurements (dollars in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range September 30, 2019 Impaired loans $ 8,128 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (20.3%) Foreclosed real estate owned 240 Appraisal of collateral (1) Appraisal adjustments (2) 20% to 35% (26.6%) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include 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 of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal. Foreclosed real estate is measured at fair value, less cost to sell at the date of foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value, less cost to sell. Income and expenses from operations and changes in valuation allowance are included in the net expenses from foreclosed real estate. Impaired loans are reported at fair value utilizing level three inputs. For these loans, a review of the collateral is conducted and an appropriate allowance for loan losses is allocated to the loan. At June 30, 2020, 106 impaired loans with a carrying value of $18.3 million were reduced by specific valuation allowance totaling $192,000 resulting in a net fair value of $18.1 million based on Level 3 inputs. At September 30, 2019, 138 impaired loans with a carrying value of $8.4 million were reduced by a specific valuation totaling $248,000 resulting in a net fair value of $8.1 million based on Level 3 inputs. Assets and Liabilities not Required to be Measured and Reported at Fair Value The following tables provide the carrying value and fair value for certain financial instruments that are not required to be measured or reported at fair value on the consolidated Balance Sheet at June 30, 2020 and September 30, 2019 by level within the fair value hierarchy: June 30, 2020 (in thousands) Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 170,844 $ 170,844 $ — $ — $ 170,844 Loans receivable, net 1,423,132 — — 1,424,064 1,424,064 Accrued interest receivable 6,988 6,988 — — 6,988 Regulatory stock 18,581 18,581 — — 18,581 Mortgage servicing rights 283 — — 277 277 Bank owned life insurance 40,310 40,310 — — 40,310 Financial liabilities: Deposits $ 1,484,835 $ 984,715 $ — $ 504,370 $ 1,489,085 Short-term borrowings 138,713 138,713 — — 138,713 Other borrowings 150,827 — — 157,779 157,779 Advances by borrowers for taxes and insurance 15,242 15,242 — — 15,242 Accrued interest payable 1,211 1,211 — — 1,211 September 30, 2019 (in thousands) Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 52,242 $ 52,242 $ — $ — $ 52,242 Loans receivable, net 1,328,653 — — 1,313,231 1,313,231 Accrued interest receivable 6,225 6,225 — — 6,225 Regulatory stock 11,579 11,579 — — 11,579 Mortgage servicing rights 177 — — 241 241 Bank owned life insurance 39,601 39,601 — — 39,601 Financial liabilities: Deposits $ 1,342,830 $ 900,252 $ — $ 443,063 $ 1,343,315 Short-term borrowings 107,701 107,701 — — 107,701 Other borrowings 140,581 — — 141,427 141,427 Advances by borrowers for taxes and insurance 6,700 6,700 — — 6,700 Accrued interest payable 1,384 1,384 — — 1,384

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	11. Accumulated Other Comprehensive Income (Loss) The activity in accumulated other comprehensive income (loss) for the three and nine month periods ended June 30, 2020 and 2019 is as follows (in thousands): Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2020 $ (1,527 ) $ 4,987 $ (2,464 ) $ 996 Other comprehensive income (loss) before reclassifications — 863 (1,859 ) (996 ) Amounts reclassified from accumulated other comprehensive income (loss) — — 85 85 Period change — 863 (1,774 ) (911 ) Balance at June 30, 2020 $ (1,527 ) $ 5,850 $ (4,238 ) $ 85 Balance at March 31, 2019 $ (477 ) $ (3,562 ) $ 710 $ (3,329 ) Other comprehensive income (loss) before reclassifications — 3,230 (817 ) 2,413 Amounts reclassified from accumulated other comprehensive income (loss) — (1 ) (203 ) (204 ) Period change — 3,229 (1,020 ) 2,209 Balance at June 30, 2019 $ (477 ) $ (333 ) $ (310 ) $ (1,120 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2019 $ (1,527 ) $ 807 $ (560 ) $ (1,280 ) Other comprehensive income (loss) before reclassifications — 5,344 (3,717 ) 1,627 Amounts reclassified from accumulated other comprehensive income (loss) — (301 ) 39 (262 ) Period change — 5,043 (3,678 ) 1,365 Balance at June 30, 2020 $ (1,527 ) $ 5,850 $ (4,238 ) $ 85 Balance at September 30, 2018 $ (477 ) $ (11,369 ) $ 1,936 $ (9,910 ) Other comprehensive income (loss) before reclassifications — 11,067 (1,657 ) 9,410 Amounts reclassified from accumulated other comprehensive income (loss) — (35 ) (589 ) (624 ) Reclassification of certain income tax effects from accumulated other comprehensive income (loss) — 4 — 4 Period change — 11,036 (2,246 ) 8,790 Balance at June 30, 2019 $ (477 ) $ (333 ) $ (310 ) $ (1,120 ) The following table presents significant amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine month periods ended June 30, 2020 and 2019 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Details About Accumulated Other Comprehensive Income (Loss) Components Accumulated Other Comprehensive Income (Loss) for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2020 2019 Securities available for sale Net securities gains reclassified into earnings $ — $ 1 Gain on sale of investment securities available for sale, net Related income tax expense — — Income taxes Net effect on accumulated other comprehensive income (loss) for the period — 1 Derivatives and hedging activities: Interest expense, effective portion (108 ) 258 Short-term borrowings interest expense Related income tax expense 23 (55 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period (85 ) 203 Total reclassification for the period $ (85 ) $ 204 Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2020 2019 Securities available for sale: Net securities gains reclassified into earnings $ 381 $ 44 Gain on sale of investment securities available for sale, net Related income tax expense (80 ) (9 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period 301 35 Net of tax Derivative and hedging activities: Interest expense, effective portion (50 ) 746 Short-term borrowings interest expense Related income tax expense 11 (157 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period (39 ) 589 Total reclassification for the period $ 262 $ 624

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Jun. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	12. Derivatives and Hedging Activities Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities and through the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to certain variable rate borrowings. Fair Values of Derivative Instruments on the Consolidated Balance Sheet The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2020 As of September 30, 2019 Hedged Item Notional Amount Balance Sheet Location Fair Value Notional Amount Balance Sheet Location Fair Value FHLB Advances $ 25,000 Other Assets $ 2 $ 50,000 Other Assets $ 303 Commercial Loans 49,440 Other Assets 2,230 - Other Assets - Total $ 74,440 $ 2,232 $ 50,000 $ 303 Fair Values of Derivative Instruments Liability Derivatives As of June 30, 2020 As of September 30, 2019 Hedged Item Notional Amount Balance Sheet Location Fair Value Notional Amount Balance Sheet Location Fair Value FHLB Advances $ 410,000 Other Liabilities $ 4,603 $ 35,000 Other Liabilities $ 513 Brokered Deposits 25,000 Other Liabilities 762 50,000 Other Liabilities 498 Commercial Loans 68,639 Other Liabilities 2,244 - Other Liabilities - Total $ 503,639 $ 7,609 $ 85,000 $ 1,011 Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest income and expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company has entered into interest rate swaps as part of its interest rate risk management strategy. These interest rate swaps are designated as cash flow hedges and involve the receipt of variable rate amounts from a counterparty in exchange for the Company making fixed payments. As of June 30, 2020, the Company had forty nine interest rate swaps with a notional principal amount of $578.1 million associated with the Company’s cash outflows associated with various FHLB advances, brokered certificates and commercial loans. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in other comprehensive income (outside of earnings), net of tax, and subsequently reclassified to earnings when the hedged transaction affects earnings, and the ineffective portion of changes in the fair value of the derivative is recognized directly in earnings. The Company assesses the effectiveness of each hedging relationship by comparing the changes in cash flows of the derivative hedging instrument with the changes in cash flows of the designated hedged transactions. The Company did not recognize any hedge ineffectiveness in earnings during the periods ended June 30, 2020 and 2019. Amounts reported in accumulated other comprehensive income ( loss) related to derivatives that will be reclassified to interest income/expense as interest payments are made/received on the Company’s variable-rate assets/liabilities. During the three months ended June 30, 2020 and 2019, the Company had $108,000 of losses which resulted in an increase to interest expense and $258,000 of gains reclassified which resulted in a decrease to interest expense. During the nine months ended June 30, 2020 and 2019, the Company had $50,000 of losses which resulted in an increase to interest expense and $746,000 of gains reclassified which resulted in a decrease to interest expense. During the next twelve months, the Company estimates that $2.5 million will be reclassified as a increase to interest expense. The table below presents the effect of the Company’s cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss) for the three and nine month periods ended June 30, 2020 and 2019 (in thousands). The Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) Derivatives in Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss) Gain Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Derivatives in Cash Flow Hedging Relationships 2020 2019 2020 2019 Interest Rate Products $ (2,244 ) $ (1,292 ) Interest expense $ (108 ) $ 258 Total $ (2,244 ) $ (1,292 ) $ (108 ) $ 258 Derivatives in Cash Flow Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss) Gain Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, 2020 2019 2020 2019 Interest Rate Products $ (4,655 ) $ 2,842 Interest expense $ (50 ) $ 746 Total $ (4,655 ) $ 2,842 $ (50 ) $ 746 Credit-risk-related Contingent Features The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well / adequately capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of June 30, 2020, the Company had derivatives in a net liability position and was required to post $7.2 million in collateral against its obligations under these agreements. As of September 30, 2019, the Company was required to post $710,000 in collateral against its obligations under these agreements. If the Company had breached any of these provisions at June 30, 2020 and September 30, 2019, it could have been required to settle its obligations under the agreements at the termination value.

Contingent Liabilities

Contingent Liabilities	9 Months Ended
	Jun. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Contingent Liabilities	13. Contingent Liabilities Legal Proceedings The Company and its subsidiaries are subject to various legal actions arising in the normal course of business. In the opinion of Management, the resolution of these legal actions is not expected to have a material adverse effect on the Company’s results of operations. The Bank was named as a defendant in an action commenced on December 8, 2016 by one plaintiff who will also seek to pursue this action as a class action on behalf of the entire class of people similarly situated. The plaintiff alleges that a bank previously acquired by ESSA Bancorp received unearned fees and kickbacks in the process of making loans, in violation of the Real Estate Settlement Procedures Act. In an order dated January 29, 2018, the district court granted the Bank’s motion to dismiss the case. The plaintiff appealed the court’s ruling. In an opinion and order dated April 26, 2019, the appellate court reversed the district court’s order dismissing the plaintiff’s case against the Bank, and remanded the case back to the district court in order to continue the litigation. The litigation is now proceeding before the district court. On December 9, 2019, the Court permitted an amendment to the complaint to add two new plaintiffs to the case asserting similar claims. On May 21, 2020, the Court granted the plaintiffs’ motion for class certification. The case is currently stayed through late-September while the parties explore the possibility of a negotiated resolution to the case. If these discussions are not successful, the Bank will continue to defend against such allegations. To the extent that pending or threatened litigation could result in exposure to the Bank, the amount of such exposure is not currently estimable. On May 29, 2020, the Bank was named as a defendant in a second action commenced by three plaintiffs who will also seek to pursue this action as a class action on behalf of the entire class of people similarly situated. The plaintiffs allege that a bank previously acquired by ESSA Bancorp received unearned fees and kickbacks from a different title company than the one involved in the previously discussed litigation in the process of making loans. The Complaint alleges violations of the Real Estate Settlement Procedures Act, the Sherman Act, and the Racketeer Influenced and Corrupt Organizations Act. The litigation is in its early stages, and the Bank’s response to the Plaintiffs’ Complaint is due August 10. The Bank intends to defend against such allegations. To the extent that pending or threatened litigation could result in exposure to the Bank, the amount of such exposure is not currently estimable.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Revenue Recognition	14. Effective October 1, 2018, the Company adopted ASU 2014-09 Revenue from Contracts with Customers- Topic 606 The main types of non interest income within the scope of the standard are: Trust and Investment Fees Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts and other customer assets. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fee rate. Payment is generally received a few days after month end through a direct charge to customer’s accounts. The Company does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and asset management customers. The Company’s performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, at a point in time (i.e. as incurred). Payment is received shortly after services are rendered. Service Charges on Deposit Accounts 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, Exchange, and Other Service Charges 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. Insurance Commissions Insurance income primarily consists of commissions received on product sales. The Company acts as an intermediary between the Company’s customer and the insurance carrier. The Company’s performance obligation is generally satisfied upon the issuance of the policy. Shortly after the policy is issued, the carrier remits the commission payment to the Company, and the Company recognizes the revenue.

Leases

Leases	9 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	15. A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. On October 1, 2019, the Company adopted ASU No. 2016-02 “Leases” (Topic 842) and all subsequent ASUs that modified Topic 842. For the Company, Topic 842 primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. Lessee Accounting Substantially all of the leases in which the Company is the lessee are comprised of real estate property for branches, ATM locations, and office space with terms extending through 2044. All of our leases are classified as operating leases, and therefore, were previously not recognized on the Company’s Consolidated Balance sheet. With the adoption of Topic 842, operating lease agreements are required to be recognized on the Consolidated Balance sheet as a right-of-use (“ROU”) asset and a corresponding lease liability. The following table presents the Consolidated Balance Sheet classification of the Company’s ROU assets and lease liabilities. The Company elected not to include short-term leases (i.e., leases with initial terms of twelve months or less), or equipment leases (deemed immaterial) on the Consolidated Balance sheet. (in thousands) June 30, 2020 Lease Right-of-Use Assets Classification Operating lease right-of-use assets Other assets $ 7,323 Total Lease Right-Of-Use Assets $ 7,323 (in thousands) June 30, 2020 Lease Liabilities Classification Operating lease Liabilities Other liabilities $ 7,384 Total Lease Liabilities $ 7,384 The calculated amount of the ROU assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the ROU asset and lease liability. Regarding the discount rate, Topic 842 requires the use of the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. For operating leases existing prior to October 1, 2019, the rate for the remaining lease term as of October 1, 2019 was used. June 30, 2020 Weighted average remaining lease term Operating leases 13.6 years Weighted average discount rate Operating leases 2.39 % The following table represents lease costs and other lease information. As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as common area maintenance and utilities. Lease Costs (in thousands) Three Months Ended June 30, 2020 Operating lease cost $ 259 Variable lease cost 61 Net lease cost $ 320 Lease Costs (in thousands) Nine Months Ended June 30,2020 Operating lease cost $ 780 Variable lease cost 171 Net lease cost $ 951 Future minimum payments for finance leases and operating leases with initial or remaining terms of one year or more as of June 30, 2020 were as follows: (in thousands) Operating leases Twelve months Ended: June 30, 2021 $ 1,051 June 30, 2022 937 June 30, 2023 739 June 30, 2024 668 June 30, 2025 527 Thereafter 4,834 Total future minimum lease payments 8,756 Amounts representing interest (1,372 ) Present Value of Net Future Minimum Lease Payments $ 7,384

Accounting Pronouncements (Poli

Accounting Pronouncements (Policies)	9 Months Ended
	Jun. 30, 2020
Accounting Changes And Error Corrections [Abstract]
Adoption of New Standards	Adoption of New Standards In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, Leases. The new leases standard requires a lessor to classify leases as either sales-type, direct financing or operating, similar to existing U.S. GAAP. Classification depends on the same five criteria used by lessees plus certain additional factors. The subsequent accounting treatment for all three lease types is substantially equivalent to existing U.S. GAAP for sales-type leases, direct financing leases, and operating leases. However, the new standard updates certain aspects of the lessor accounting model to align it with the new lessee accounting model, as well as with the new revenue standard under Topic 606. Lessees and lessors are required to provide certain qualitative and quantitative disclosures to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new leases standard addresses other considerations including identification of a lease, separating lease and non-lease components of a contract, sale and leaseback transactions, modifications, combining contracts, reassessment of the lease term, and re-measurement of lease payments. It also contains comprehensive implementation guidance with practical examples ASU 2016-02 was adopted by us on October 1, 2019 and initially required transition using a modified retrospective approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842) “Leases (Topic 842) - Targeted Improvements,” ASU 2018-20, “Leases (Topic 842) - Narrow-Scope Improvements for Lessors,” Leases (Topic 842): Codification Improvements, Upon adoption of ASU 2016-02, ASU 2018-01, ASU 2018-11, ASU 2018-20, and ASU 2019-01 on October 1, 2019, we recognized right-of-use assets and related lease liabilities totaling $7.3 million and $7.3 million, respectively. We elected to apply certain practical expedients provided under ASU 2016-02 whereby we will not reassess (i) whether any expired or existing contracts are or contain leases, (ii) the lease classification for any expired or existing leases and (iii) initial direct costs for any existing leases. We also did not apply the recognition requirements of ASU 2016-02 to any short-term leases (as defined by related accounting guidance). We utilized the modified-retrospective transition approach prescribed by ASU 2018-11.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments periods beginning after December 15, 2018. With certain exceptions, transition to the new requirements will be through a cumulative effect adjustment to opening retained earnings as of the beginning of the first reporting period in which the guidance is adopted. In November 2019, the FASB issued ASU 2019-10, Financial Instruments ‒ Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842) . This Update defers the effective date of ASU 2016-13 for SEC filers that are eligible to be smaller reporting companies, non-SEC filers, and all other companies to fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. We expect to recognize a one-time cumulative effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes the Disclosure Requirements for Fair Value Measurements In August 2018, the FASB issued ASU 2018-14, Compensation – Retirement Benefits (Topic 715-20) In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging , and Topic 825, Financial Instruments , which affects a variety of topics in the Codification and applies to all reporting entities within the scope of the affected accounting guidance. Topic 326, Financial Instruments – Credit Losses amendments are effective for SEC registrants for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. For all other public business entities, the effective date is for fiscal years beginning after December 15, 2020, and for all other entities, the effective date is for fiscal years beginning after December 15, 2021. Topic 815, Derivatives and Hedging amendments are effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods beginning after December 15, 2020. For entities that have adopted the amendments in Update 2017-12, the effective date is as of the beginning of the first annual period beginning after the issuance of this Update. Topic 825, Financial Instruments amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations. 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 November 2019, the FASB issued ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments – Credit Losses In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740 In January 2020, the FASB issued ASU 2020-1, Investments – Equity Securities (Topic 321) that, for the purpose of applying paragraph 815-10-15-141(a) an entity should not consider whether, upon the settlement of the forward contract or exercise of the purchased option, individually or with existing investments, the underlying securities would be accounted for under the equity method in Topic 323 or the fair value option, in accordance with the financial instruments guidance in Topic 825. An entity also would evaluate the remaining characteristics in paragraph 815-10-15-141 to determine the accounting for those forward contracts and purchased options. For public business entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2021, and interim periods within those fiscal years. This Update is not expected to have a significant impact on the Company’s financial statements. In January 2020, the FASB issued ASU 2020-2, Financial Instruments – Credit Losses (Topic 326) and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842), February 2020 In March 2020, the FASB issued ASU 2020-3 , Codification Improvements to Financial Instruments. Financial Instruments 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

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Composition of the Weighted-Average Common Shares (Denominator) Used in the Basic and Diluted Earnings Per Share Computation	The following table sets forth the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computation for the three and nine month periods ended June 30, 2020 and 2019. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2020 2019 2020 2019 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (7,076,709 ) (6,724,160 ) (6,924,021 ) (6,498,995 ) Average unearned ESOP shares (741,156 ) (786,420 ) (752,513 ) (797,778 ) Average unearned non-vested shares (54,735 ) (48,107 ) (50,204 ) (48,562 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,260,495 10,574,408 10,406,357 10,787,760 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share 234 — 257 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,260,729 10,574,408 10,406,614 10,787,760

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Jun. 30, 2020
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale	The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands): June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 102,317 $ 3,432 $ (104 ) $ 105,645 Freddie Mac 72,970 2,421 (3 ) 75,388 Governmental National Mortgage Association 19,477 538 (88 ) 19,927 Total mortgage-backed securities 194,764 6,391 (195 ) 200,960 Obligations of states and political subdivisions 21,145 761 — 21,906 U.S. government agency securities 7,991 86 — 8,077 Corporate obligations 49,299 650 (571 ) 49,378 Other debt securities 14,626 436 (155 ) 14,907 Total $ 287,825 $ 8,324 $ (921 ) $ 295,228 September 30, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 126,672 $ 987 $ (554 ) $ 127,105 Freddie Mac 80,639 453 (331 ) 80,761 Governmental National Mortgage Association 18,590 182 (198 ) 18,574 Total mortgage-backed securities 225,901 1,622 (1,083 ) 226,440 Obligations of states and political subdivisions 19,860 356 (4 ) 20,212 U.S. government agency securities 6,454 234 — 6,688 Corporate obligations 43,121 594 (581 ) 43,134 Other debt securities 17,036 84 (201 ) 16,919 Total $ 312,372 $ 2,890 $ (1,869 ) $ 313,393
Summary of Unrealized and Realized Gains Losses Recognized in Net Income on Equity Securities	The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and nine months ended June 30, 2020 and 2019. (in thousands) Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Net gains recognized during the period on equity securities $ 2 $ 2 Less: Net gains recognized during the period on equity securities sold during the period — — Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 2 $ 2 (in thousands) Nine Months Ended June 30, 2020 Nine Months Ended June 30, 2019 Net (losses) gains recognized during the period on equity securities $ (3 ) $ 3 Less: Net gains recognized during the period on equity securities sold during the period — — Unrealized (losses) gains recognized during the reporting period on equity securities still held at the reporting date $ (3 ) $ 3
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities at June 30, 2020, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties (in thousands): Available For Sale Amortized Cost Fair Value Due in one year or less $ 2,045 $ 2,045 Due after one year through five years 23,428 23,833 Due after five years through ten years 83,329 85,008 Due after ten years 179,023 184,342 Total $ 287,825 $ 295,228
Schedule of Gross Unrealized Losses and Fair Value	The following tables show the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands): June 30, 2020 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 10 $ 2,470 $ (31 ) $ 6,406 $ (73 ) $ 8,876 $ (104 ) Freddie Mac 1 348 (3 ) — — 348 (3 ) Governmental National Mortgage Association 6 3,981 (55 ) 3,606 (33 ) 7,587 (88 ) Corporate obligations 21 12,651 (151 ) 7,594 (420 ) 20,245 (571 ) Other debt securities 10 — — 3,985 (155 ) 3,985 (155 ) Total 48 $ 19,450 $ (240 ) $ 21,591 $ (681 ) $ 41,041 $ (921 ) September 30, 2019 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 48 $ 5,568 $ (6 ) $ 45,867 $ (548 ) $ 51,435 $ (554 ) Freddie Mac 32 765 — 29,661 (331 ) 30,426 (331 ) Governmental National Mortgage Association 12 345 (1 ) 8,242 (197 ) 8,587 (198 ) Obligations of states and political subdivisions 2 2,159 (4 ) — — 2,159 (4 ) Corporate obligations 13 2,063 (5 ) 12,015 (576 ) 14,078 (581 ) Other debt securities 14 3,493 (16 ) 6,132 (185 ) 9,625 (201 ) Total 121 $ 14,393 $ (32 ) $ 101,917 $ (1,837 ) $ 116,310 $ (1,869 )

Loans Receivable, Net and All_2

Loans Receivable, Net and Allowance for Loan Losses (Tables)	9 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable consist of the following (in thousands): June 30, 2020 September 30, 2019 Real estate loans: Residential $ 605,307 $ 597,514 Construction 10,305 5,672 Commercial 508,056 480,647 Commercial 142,489 55,559 Obligations of states and political subdivisions 77,792 71,828 Home equity loans and lines of credit 42,159 45,156 Auto loans 48,920 81,983 Other 2,434 2,924 1,437,462 1,341,283 Less allowance for loan losses 14,330 12,630 Net loans $ 1,423,132 $ 1,328,653
Summary of Additional Information Regarding Loans Acquired and Accounted	The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): June 30, 2020 September 30, 2019 Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 1,198 $ 1,392 Carrying amount $ 1,112 $ 1,299
Schedule of Loans Evaluated for Impairment	The following tables show the amount of loans in each category that were individually and collectively evaluated for impairment at the dates indicated (in thousands): Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment June 30, 2020 Real estate loans: Residential $ 605,307 $ 3,951 $ — $ 601,356 Construction 10,305 — — 10,305 Commercial 508,056 11,479 1,112 495,465 Commercial 142,489 2,480 — 140,009 Obligations of states and political subdivisions 77,792 — — 77,792 Home equity loans and lines of credit 42,159 271 — 41,888 Auto loans 48,920 139 — 48,781 Other 2,434 13 — 2,421 Total $ 1,437,462 $ 18,333 $ 1,112 $ 1,418,017 Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment September 30, 2019 Real estate loans: Residential $ 597,514 $ 4,281 $ — $ 593,233 Construction 5,672 — — 5,672 Commercial 480,647 2,633 1,299 476,715 Commercial 55,559 448 — 55,111 Obligations of states and political sub divisions 71,828 — — 71,828 Home equity loans and lines of credit 45,156 400 — 44,756 Auto loans 81,983 583 — 81,400 Other 2,924 31 — 2,893 Total $ 1,341,283 $ 8,376 $ 1,299 $ 1,331,608
Schedule of Investment and Unpaid Principal Balances for Impaired Loans	The following tables include the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount at the dates indicated, if applicable (in thousands): Recorded Investment Unpaid Principal Balance Associated Allowance June 30, 2020 With no specific allowance recorded: Real estate loans Residential $ 3,563 $ 4,691 $ — Construction — — — Commercial 11,257 12,676 — Commercial 2,312 2,388 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 252 347 — Auto loans 46 120 — Other 13 53 — Total 17,443 20,275 — With an allowance recorded: Real estate loans Residential 388 423 28 Construction — — — Commercial 222 910 40 Commercial 168 168 82 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 19 40 — Auto loans 93 99 42 Other — — — Total 890 1,640 192 Total: Real estate loans Residential 3,951 5,114 28 Construction — — — Commercial 11,479 13,586 40 Commercial 2,480 2,556 82 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 271 387 — Auto loans 139 219 42 Other 13 53 — Total Impaired Loans $ 18,333 $ 21,915 $ 192 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2019 With no specific allowance recorded: Real Estate Loans Residential $ 3,935 $ 5,309 $ — Construction — — — Commercial 2,385 4,269 — Commercial 354 475 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 400 465 — Auto Loans 161 248 — Other 15 22 — Total 7,250 10,788 — With an allowance recorded: Real Estate Loans Residential 346 398 36 Construction — — — Commercial 248 294 56 Commercial 94 223 6 Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 422 426 144 Other 16 17 6 Total 1,126 1,358 248 Total: Real Estate Loans Residential 4,281 5,707 36 Construction — — — Commercial 2,633 4,563 56 Commercial 448 698 6 Obligations of states and political subdivisions — — — Home equity loans and lines of credit 400 465 — Auto Loans 583 674 144 Other 31 39 6 Total Impaired Loans $ 8,376 $ 12,146 $ 248 The following table represent s the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired (in thousands): For the Three Months Ended June 30, 2020 2019 2020 2019 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,602 $ 3,451 $ 1 $ 1 Construction — — — — Commercial 5,108 3,856 — — Commercial 2,323 460 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 244 231 — — Auto loans 74 130 — 1 Other 13 5 — — Total 11,364 8,133 1 2 With an allowance recorded: Real estate loans Residential 361 574 — — Construction — — — — Commercial 182 291 — — Commercial 168 823 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 6 10 — — Auto loans 85 202 — — Other — — — — Total 802 1,900 — — Total: Real estate loans Residential 3,963 4,025 1 1 Construction — — — — Commercial 5,290 4,147 — — Commercial 2,491 1,283 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 250 241 — — Auto loans 159 332 — 1 Other 13 5 — — Total Impaired Loans $ 12,166 $ 10,033 $ 1 $ 2 For the Nine Months Ended June 30, 2020 2019 2020 2019 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,800 $ 3,728 $ 2 $ 4 Construction — — — — Commercial 3,203 3,425 1 54 Commercial 1,260 250 4 1 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 253 204 — — Auto loans 130 101 1 2 Other 14 13 — — Total 8,660 7,721 8 61 With an allowance recorded: Real estate loans Residential 304 846 — — Construction — — — — Commercial 239 126 — — Commercial 97 285 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 2 19 — — Auto loans 128 219 — — Other 8 — — — Total 778 1,495 — — Total: Real estate loans Residential 4,104 4,574 2 4 Construction — — — — Commercial 3,442 3,551 1 54 Commercial 1,357 535 4 1 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 255 223 — — Auto loans 258 320 1 2 Other 22 13 — — Total Impaired Loans $ 9,438 $ 9,216 $ 8 $ 61
Classes of the Loan Portfolio, Internal Risk Rating System	The following tables present the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful or Loss within the internal risk rating system at June 30, 2020 and September 30, 2019 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2020 Commercial real estate loans $ 487,303 $ 6,683 $ 14,070 $ — $ 508,056 Commercial 139,855 — 2,634 — 142,489 Obligations of states and political subdivisions 77,792 — — — 77,792 Total $ 704,950 $ 6,683 $ 16,704 $ — $ 728,337 Pass Special Mention Substandard Doubtful or Loss Total September 30, 2019 Commercial real estate loans $ 461,701 $ 7,492 $ 11,454 $ — $ 480,647 Commercial 52,486 — 3,073 — 55,559 Obligations of states and political subdivisions 71,828 — — — 71,828 Total $ 586,015 $ 7,492 $ 14,527 $ — $ 608,034
Schedule of Performing or Nonperforming Loans	The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2020 and September 30, 2019 (in thousands): Performing Non- performing Total June 30, 2020 Real estate loans: Residential $ 600,891 $ 4,416 $ 605,307 Construction 10,305 — 10,305 Home equity loans and lines of credit 41,806 353 42,159 Auto loans 48,753 167 48,920 Other 2,421 13 2,434 Total $ 704,176 $ 4,949 $ 709,125 Performing Non- performing Total September 30, 2019 Real estate loans: Residential $ 592,907 $ 4,607 $ 597,514 Construction 5,672 — 5,672 Home equity loans and lines of credit 44,534 622 45,156 Auto loans 81,317 666 81,983 Other 2,883 41 2,924 Total $ 727,313 $ 5,936 $ 733,249
Classes of the Loan Portfolio Summarized by the Aging Categories	The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of June 30, 2020 and September 30, 2019 (in thousands): 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans June 30, 2020 Real estate loans: Residential $ 598,797 $ 1,259 $ 835 $ — $ 4,416 $ 6,510 $ — $ — $ 605,307 Construction 10,305 — — — — — — — 10,305 Commercial 495,110 89 334 — 11,411 $ 11,834 236 876 508,056 Commercial 139,495 31 130 — 2,833 $ 2,994 — — 142,489 Obligations of states and political subdivisions 77,792 — — — — — — — 77,792 Home equity loans and lines of credit 41,625 68 113 — 353 534 — — 42,159 Auto loans 48,048 687 18 — 167 872 — — 48,920 Other 2,408 — 13 — 13 26 — — 2,434 Total $ 1,413,580 $ 2,134 $ 1,443 $ — $ 19,193 $ 22,770 $ 236 $ 876 $ 1,437,462 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans September 30, 2019 Real estate loans: Residential $ 590,457 $ 2,187 $ 263 $ — $ 4,607 $ 7,057 $ — $ — $ 597,514 Construction 5,672 — — — — — — — 5,672 Commercial 476,644 236 — — 2,468 2,704 243 1,056 480,647 Commercial 54,899 20 37 — 603 660 — — 55,559 Obligations of states and political subdivisions 71,828 — — — — — — — 71,828 Home equity loans and lines of credit 44,319 47 168 — 622 837 — — 45,156 Auto loans 80,090 1,227 — — 666 1,893 — — 81,983 Other 2,883 — — — 41 41 — — 2,924 Total $ 1,326,792 $ 3,717 $ 468 $ — $ 9,007 $ 13,192 $ 243 $ 1,056 $ 1,341,283
Summary of Changes in Primary Segments of ALL	The following table summarizes changes in the primary segments of the ALL for the three and nine months ended June 30, 2020 and 2019 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total ALL balance at March 31, 2020 $ 4,330 $ 55 $ 4,563 $ 2,180 $ 359 $ 351 $ 1,104 $ 29 $ 208 $ 13,179 Charge-offs (42 ) — (4 ) — — (21 ) (135 ) (15 ) — (217 ) Recoveries 1 — 17 — — 1 49 0 — 68 Provision 78 48 2,294 (1,206 ) 185 5 (55 ) 10 (59 ) 1,300 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 ALL balance at March 31, 2019 $ 3,742 $ 59 $ 3,816 $ 1,865 $ 294 $ 295 $ 1,608 $ 27 $ 683 $ 12,389 Charge-offs (49 ) — (114 ) (5 ) — — (229 ) — — (397 ) Recoveries 23 — 18 — — 2 170 1 — 214 Provision 313 — (96 ) 41 44 31 (21 ) (1 ) 89 400 ALL balance at June 30, 2019 $ 4,029 $ 59 $ 3,624 $ 1,901 $ 338 $ 328 $ 1,528 $ 27 $ 772 $ 12,606 ALL balance at September 30, 2019 $ 4,243 $ 53 $ 3,806 $ 1,870 $ 343 $ 329 $ 1,384 $ 28 $ 574 $ 12,630 Charge-offs (72 ) — (54 ) — — (61 ) (717 ) (20 ) — (924 ) Recoveries 7 — 77 1 — 4 358 2 — 449 Provision 189 50 3,041 (897 ) 201 64 (62 ) 14 (425 ) 2,175 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 ALL balance at September 30, 2018 $ 3,605 $ 35 $ 3,458 $ 1,462 $ 323 $ 296 $ 1,859 $ 23 $ 627 $ 11,688 Charge-offs (322 ) — (121 ) (27 ) — (19 ) (967 ) (11 ) — (1,467 ) Recoveries 32 — 30 — — 5 439 3 — 509 Provision 714 24 257 466 15 46 197 12 145 1,876 ALL balance at June 30, 2019 $ 4,029 $ 59 $ 3,624 $ 1,901 $ 338 $ 328 $ 1,528 $ 27 $ 772 $ 12,606 During the three months ended June 30, 2020 the Company recorded provision expense for the residential real estate loans, commercial real estate loans, obligations of states and political subdivisions, construction loans, home equity loans and lines of credit and other loan segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Provision expense was also recorded for possible loan losses due to the economic slowdown caused by COVID-19 restrictions. Credit provisions were recorded for loan loss for the commercial loans and auto loan segments. During the nine months ended June 30, 2020 the Company recorded provision expense for the residential real estate loans, commercial real estate loans, obligations of states and political subdivisions, construction loans, home equity loans and lines of credit and other loan segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Provision expense was also recorded for possible loan losses due to the economic slowdown caused by COVID-19 restrictions. Credit provisions were recorded for loan loss for the commercial loans and auto loan segments. During the three months ended June 30, 2019 the Company recorded provision expense for the residential real estate, construction loans, commercial, obligations of states and political subdivisions and home equity loans and lines of credit, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Credit provisions were recorded for loan loss for the commercial real estate, auto and other loan segments. During the nine months ended June 30, 2019 the Company recorded provision expense for the all loans segments, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. The Company is closely monitoring all customer credit positions, particularly loans requesting payment relief. Such loans, as of June 30, 2020 amounted to approximately 12.4% of total loans outstanding, including $144.6 million in commercial real estate loans, $5.5 in commercial loans, $27.8 million in mortgage loans, $687,000 in auto loans. As the economic slowdown continues to evolve due to COVID-19 restrictions, our customers may experience decreased cash flows, which may correlate to an inability to make timely loan payments. This, in turn may require further increases in our allowance for loan losses and increases in the level of charge-offs in our loan portfolio. The following table summarizes the primary segments of the ALL, segregated into two categories, the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2020 and September 30, 2019 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total Individually evaluated for impairment $ 28 $ — $ 40 $ 82 $ — $ — $ 42 $ — $ — $ 192 Collectively evaluated for impairment 4,339 103 6,830 892 544 336 921 24 149 14,138 ALL balance at June 30, 2020 $ 4,367 $ 103 $ 6,870 $ 974 $ 544 $ 336 $ 963 $ 24 $ 149 $ 14,330 Individually evaluated for impairment $ 36 $ — $ 56 $ 6 $ — $ — $ 144 $ 6 $ — $ 248 Collectively evaluated for impairment 4,207 53 3,750 1,864 343 329 1,240 22 574 12,382 ALL balance at September 30, 2019 $ 4,243 $ 53 $ 3,806 $ 1,870 $ 343 $ 329 $ 1,384 $ 28 $ 574 $ 12,630
Summary of Troubled Debt Restructuring Granted	The following is a summary of troubled debt restructuring granted during the nine months ended June 30, 2020 and 2019 (dollars in thousands): For the Nine Months Ended June 30, 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 1 $ 534 $ 534 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans — — — Other — — — Total 1 $ 534 $ 534 For the Nine Months Ended June 30, 2019 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 95 $ 95 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 2 159 159 Auto loans 1 21 21 Other — — — Total 5 $ 275 $ 275

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Jun. 30, 2020
Deposits Liabilities Disclosures [Abstract]
Schedule of Deposits by Major Classifications	Deposits consist of the following major classifications (in thousands): June 30, 2020 September 30, 2019 Non-interest bearing demand accounts $ 235,783 $ 175,932 Interest bearing demand accounts 238,426 224,673 Money market accounts 351,463 364,635 Savings and club accounts 159,043 135,012 Certificates of deposit 500,120 442,578 Total $ 1,484,835 $ 1,342,830

Net Periodic Benefit Cost-Def_2

Net Periodic Benefit Cost-Defined Benefit Plan (Tables)	9 Months Ended
	Jun. 30, 2020
Compensation And Retirement Disclosure [Abstract]
Summary of the Components of Net Periodic Benefit Cost	The following table comprises the components of net periodic benefit cost for the three and nine month periods ended June 30, 2020 and 2019 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2020 2019 2020 2019 Service Cost $ — $ — $ — $ — Interest Cost 121 174 364 520 Expected return on plan assets (268 ) (293 ) (807 ) (878 ) Amortization of unrecognized loss — — — — Net periodic benefit cost $ (147 ) $ (119 ) $ (443 ) $ (358 )

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	9 Months Ended
	Jun. 30, 2020
Postemployment Benefits [Abstract]
Schedule of Restricted Stock Option Activity	The following is a summary of the status of the Company’s restricted stock as of June 30, 2020, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2019 34,963 $ 16.13 Granted 33,367 16.19 Vested (8,819 ) 16.25 Forfeited (2,442 ) — Nonvested at June 30, 2020 57,069 $ 16.17

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Fair Value For Assets and Liabilities Required to be Measured and Reported at Fair Value on a Recurring Basis	The following tables provide the fair value for assets and liabilities required to be measured and reported at fair value on a recurring basis on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 by level within the fair value hierarchy (in thousands). Recurring Fair Value Measurements at Reporting Date June 30, 2020 Assets Level I Level II Level III Total Investment securities available for sale: Mortgage backed securities $ — $ 200,960 $ — $ 200,960 Obligations of states and political subdivisions — 21,906 — 21,906 U.S. government agencies — 8,077 — 8,077 Corporate obligations — 42,591 6,787 49,378 Other debt securities — 14,907 — 14,907 Total Debt Securities $ — $ 288,441 $ 6,787 $ 295,228 Equity securities- financial services 23 — — 23 Derivatives and hedging activities — 2,232 — 2,232 Liabilities Derivatives and hedging activities — 7,609 — 7,609 September 30, 2019 Level I Level II Level III Total Investment securities available for sale: Mortgage backed securities $ — $ 226,440 $ — $ 226,440 Obligations of states and political subdivisions — 20,212 — 20,212 U.S. government agencies — 6,688 — 6,688 Corporate obligations — 35,342 7,792 43,134 Other debt securities — 16,919 — 16,919 Total debt securities $ — $ 305,601 $ 7,792 $ 313,393 Equity securities-financial services 25 — — 25 Derivatives and hedging activities — 303 — 303 Liabilities: Derivatives and hedging activities — 1,011 — 1,011
Schedule of Changes in Fair Value of Level III Investments	The following table presents a summary of changes in the fair value of the Company’s Level III investments for the three and nine month periods ended June 30, 2020 and 2019 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2020 June 30, 2019 Beginning balance $ 7,821 $ 7,733 Purchases, sales, issuances, settlements, net (1,000 ) — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (loss) (34 ) 89 Transfers in and/or out of Level III — — $ 6,787 $ 7,822 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2020 June 30, 2019 Beginning balance $ 7,792 $ 7,738 Purchases, sales, issuances, settlements, net (1,000 ) — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive (loss) income (5 ) 84 Transfers in and/or out of Level III — — $ 6,787 $ 7,822
Schedule of Fair Value For Assets Required to be Measured and Reported at Fair Value on a Nonrecurring Basis	The following tables provide the fair value for assets required to be measured and reported at fair value on a non recurring basis on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 by level within the fair value hierarchy: Non-Recurring Fair Value Measurements at Reporting Date (in thousands) June 30, 2020 Level I Level II Level III Total Foreclosed real estate $ — $ — $ 412 $ 412 Impaired loans — — 18,141 18,141 September 30, 2019 Level I Level II Level III Total Foreclosed real estate $ — $ — $ 240 $ 240 Impaired loans — — 8,128 8,128
Summary of Additional Quantitative Information about Assets Measured at Fair Value on a Nonrecurring Basis	The following tables present additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (dollars in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2020 Impaired loans $ 18,141 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (20.6%) Foreclosed real estate owned 412 Appraisal of collateral (1) Appraisal adjustments (2) 20% to 46% (25.1%) Quantitative Information about Level 3 Fair Value Measurements (dollars in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range September 30, 2019 Impaired loans $ 8,128 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (20.3%) Foreclosed real estate owned 240 Appraisal of collateral (1) Appraisal adjustments (2) 20% to 35% (26.6%) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include 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 of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
Schedule of Carrying Value and Fair Value for Certain Financial Instruments not Required to be Measured and Reported at Fair Value	The following tables provide the carrying value and fair value for certain financial instruments that are not required to be measured or reported at fair value on the consolidated Balance Sheet at June 30, 2020 and September 30, 2019 by level within the fair value hierarchy: June 30, 2020 (in thousands) Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 170,844 $ 170,844 $ — $ — $ 170,844 Loans receivable, net 1,423,132 — — 1,424,064 1,424,064 Accrued interest receivable 6,988 6,988 — — 6,988 Regulatory stock 18,581 18,581 — — 18,581 Mortgage servicing rights 283 — — 277 277 Bank owned life insurance 40,310 40,310 — — 40,310 Financial liabilities: Deposits $ 1,484,835 $ 984,715 $ — $ 504,370 $ 1,489,085 Short-term borrowings 138,713 138,713 — — 138,713 Other borrowings 150,827 — — 157,779 157,779 Advances by borrowers for taxes and insurance 15,242 15,242 — — 15,242 Accrued interest payable 1,211 1,211 — — 1,211 September 30, 2019 (in thousands) Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 52,242 $ 52,242 $ — $ — $ 52,242 Loans receivable, net 1,328,653 — — 1,313,231 1,313,231 Accrued interest receivable 6,225 6,225 — — 6,225 Regulatory stock 11,579 11,579 — — 11,579 Mortgage servicing rights 177 — — 241 241 Bank owned life insurance 39,601 39,601 — — 39,601 Financial liabilities: Deposits $ 1,342,830 $ 900,252 $ — $ 443,063 $ 1,343,315 Short-term borrowings 107,701 107,701 — — 107,701 Other borrowings 140,581 — — 141,427 141,427 Advances by borrowers for taxes and insurance 6,700 6,700 — — 6,700 Accrued interest payable 1,384 1,384 — — 1,384

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Summary of Activity in Accumulated Other Comprehensive Income (Loss)	The activity in accumulated other comprehensive income (loss) for the three and nine month periods ended June 30, 2020 and 2019 is as follows (in thousands): Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2020 $ (1,527 ) $ 4,987 $ (2,464 ) $ 996 Other comprehensive income (loss) before reclassifications — 863 (1,859 ) (996 ) Amounts reclassified from accumulated other comprehensive income (loss) — — 85 85 Period change — 863 (1,774 ) (911 ) Balance at June 30, 2020 $ (1,527 ) $ 5,850 $ (4,238 ) $ 85 Balance at March 31, 2019 $ (477 ) $ (3,562 ) $ 710 $ (3,329 ) Other comprehensive income (loss) before reclassifications — 3,230 (817 ) 2,413 Amounts reclassified from accumulated other comprehensive income (loss) — (1 ) (203 ) (204 ) Period change — 3,229 (1,020 ) 2,209 Balance at June 30, 2019 $ (477 ) $ (333 ) $ (310 ) $ (1,120 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2019 $ (1,527 ) $ 807 $ (560 ) $ (1,280 ) Other comprehensive income (loss) before reclassifications — 5,344 (3,717 ) 1,627 Amounts reclassified from accumulated other comprehensive income (loss) — (301 ) 39 (262 ) Period change — 5,043 (3,678 ) 1,365 Balance at June 30, 2020 $ (1,527 ) $ 5,850 $ (4,238 ) $ 85 Balance at September 30, 2018 $ (477 ) $ (11,369 ) $ 1,936 $ (9,910 ) Other comprehensive income (loss) before reclassifications — 11,067 (1,657 ) 9,410 Amounts reclassified from accumulated other comprehensive income (loss) — (35 ) (589 ) (624 ) Reclassification of certain income tax effects from accumulated other comprehensive income (loss) — 4 — 4 Period change — 11,036 (2,246 ) 8,790 Balance at June 30, 2019 $ (477 ) $ (333 ) $ (310 ) $ (1,120 )
Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss)	The following table presents significant amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three and nine month periods ended June 30, 2020 and 2019 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Details About Accumulated Other Comprehensive Income (Loss) Components Accumulated Other Comprehensive Income (Loss) for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2020 2019 Securities available for sale Net securities gains reclassified into earnings $ — $ 1 Gain on sale of investment securities available for sale, net Related income tax expense — — Income taxes Net effect on accumulated other comprehensive income (loss) for the period — 1 Derivatives and hedging activities: Interest expense, effective portion (108 ) 258 Short-term borrowings interest expense Related income tax expense 23 (55 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period (85 ) 203 Total reclassification for the period $ (85 ) $ 204 Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2020 2019 Securities available for sale: Net securities gains reclassified into earnings $ 381 $ 44 Gain on sale of investment securities available for sale, net Related income tax expense (80 ) (9 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period 301 35 Net of tax Derivative and hedging activities: Interest expense, effective portion (50 ) 746 Short-term borrowings interest expense Related income tax expense 11 (157 ) Income taxes Net effect on accumulated other comprehensive income (loss) for the period (39 ) 589 Total reclassification for the period $ 262 $ 624

Derivatives and Hedging Activit

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Jun. 30, 2020
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Financial Instruments as well as their Classification on Consolidated Balance Sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheet as of June 30, 2020 and September 30, 2019 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2020 As of September 30, 2019 Hedged Item Notional Amount Balance Sheet Location Fair Value Notional Amount Balance Sheet Location Fair Value FHLB Advances $ 25,000 Other Assets $ 2 $ 50,000 Other Assets $ 303 Commercial Loans 49,440 Other Assets 2,230 - Other Assets - Total $ 74,440 $ 2,232 $ 50,000 $ 303 Fair Values of Derivative Instruments Liability Derivatives As of June 30, 2020 As of September 30, 2019 Hedged Item Notional Amount Balance Sheet Location Fair Value Notional Amount Balance Sheet Location Fair Value FHLB Advances $ 410,000 Other Liabilities $ 4,603 $ 35,000 Other Liabilities $ 513 Brokered Deposits 25,000 Other Liabilities 762 50,000 Other Liabilities 498 Commercial Loans 68,639 Other Liabilities 2,244 - Other Liabilities - Total $ 503,639 $ 7,609 $ 85,000 $ 1,011
Schedule of Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss)	The table below presents the effect of the Company’s cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss) for the three and nine month periods ended June 30, 2020 and 2019 (in thousands). The Effect of Fair Value and Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) Derivatives in Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss) Gain Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Derivatives in Cash Flow Hedging Relationships 2020 2019 2020 2019 Interest Rate Products $ (2,244 ) $ (1,292 ) Interest expense $ (108 ) $ 258 Total $ (2,244 ) $ (1,292 ) $ (108 ) $ 258 Derivatives in Cash Flow Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss) Gain Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, 2020 2019 2020 2019 Interest Rate Products $ (4,655 ) $ 2,842 Interest expense $ (50 ) $ 746 Total $ (4,655 ) $ 2,842 $ (50 ) $ 746

Leases (Tables)

Leases (Tables)	9 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Summary of Balance Sheet Operating Lease Right-of-Use Assets and Lease Liabilities	The following table presents the Consolidated Balance Sheet classification of the Company’s ROU assets and lease liabilities. The Company elected not to include short-term leases (i.e., leases with initial terms of twelve months or less), or equipment leases (deemed immaterial) on the Consolidated Balance sheet. (in thousands) June 30, 2020 Lease Right-of-Use Assets Classification Operating lease right-of-use assets Other assets $ 7,323 Total Lease Right-Of-Use Assets $ 7,323 (in thousands) June 30, 2020 Lease Liabilities Classification Operating lease Liabilities Other liabilities $ 7,384 Total Lease Liabilities $ 7,384
Summary of Lease Term and Discount Rate	The calculated amount of the ROU assets and lease liabilities in the table above are impacted by the length of the lease term and the discount rate used to present value the minimum lease payments. The Company’s lease agreements often include one or more options to renew at the Company’s discretion. If at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the ROU asset and lease liability. Regarding the discount rate, Topic 842 requires the use of the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. For operating leases existing prior to October 1, 2019, the rate for the remaining lease term as of October 1, 2019 was used. June 30, 2020 Weighted average remaining lease term Operating leases 13.6 years Weighted average discount rate Operating leases 2.39 %
Summary of Components of Lease Cost	The following table represents lease costs and other lease information. As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as common area maintenance and utilities. Lease Costs (in thousands) Three Months Ended June 30, 2020 Operating lease cost $ 259 Variable lease cost 61 Net lease cost $ 320 Lease Costs (in thousands) Nine Months Ended June 30,2020 Operating lease cost $ 780 Variable lease cost 171 Net lease cost $ 951
Summary of Future Minimum Lease Payments	Future minimum payments for finance leases and operating leases with initial or remaining terms of one year or more as of June 30, 2020 were as follows: (in thousands) Operating leases Twelve months Ended: June 30, 2021 $ 1,051 June 30, 2022 937 June 30, 2023 739 June 30, 2024 668 June 30, 2025 527 Thereafter 4,834 Total future minimum lease payments 8,756 Amounts representing interest (1,372 ) Present Value of Net Future Minimum Lease Payments $ 7,384

Nature of Operations and Basi_2

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Jun. 30, 2020
ESSA Advisory Services, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage ownership of wholly owned subsidiary	100.00%

Earnings Per Share - Compositio

Earnings Per Share - Composition of the Weighted-Average Common Shares (Denominator) Used in the Basic and Diluted Earnings per Share Computation (Detail) - shares	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted-average common shares outstanding	18,133,095	18,133,095	18,133,095	18,133,095
Average treasury stock shares	(7,076,709)	(6,724,160)	(6,924,021)	(6,498,995)
Average unearned ESOP shares	(741,156)	(786,420)	(752,513)	(797,778)
Average unearned non-vested shares	(54,735)	(48,107)	(50,204)	(48,562)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	10,260,495	10,574,408	10,406,357	10,787,760
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share	234		257
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	10,260,729	10,574,408	10,406,614	10,787,760

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - Stock Option [Member] - $ / shares	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	42,520	39,718
Average weighted price per share of anti-dilutive shares	$ 16.15	$ 16.01

Accounting Pronouncements - Add

Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Oct. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right-of-use assets	$ 7,323
Lease liabilities	$ 7,384
ASU 2016-02, ASU 2018-01, ASU 2018-11, ASU 2018-20, and ASU 2019-01 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right-of-use assets		$ 7,300
Lease liabilities		$ 7,300

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 287,825
Available for sale, Fair Value	295,228	$ 313,393
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	102,317	126,672
Available for sale, Gross Unrealized Gains	3,432	987
Available for sale, Gross Unrealized Losses	(104)	(554)
Available for sale, Fair Value	105,645	127,105
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	72,970	80,639
Available for sale, Gross Unrealized Gains	2,421	453
Available for sale, Gross Unrealized Losses	(3)	(331)
Available for sale, Fair Value	75,388	80,761
Governmental National Mortgage Association [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	19,477	18,590
Available for sale, Gross Unrealized Gains	538	182
Available for sale, Gross Unrealized Losses	(88)	(198)
Available for sale, Fair Value	19,927	18,574
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	194,764	225,901
Available for sale, Gross Unrealized Gains	6,391	1,622
Available for sale, Gross Unrealized Losses	(195)	(1,083)
Available for sale, Fair Value	200,960	226,440
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	21,145	19,860
Available for sale, Gross Unrealized Gains	761	356
Available for sale, Gross Unrealized Losses		(4)
Available for sale, Fair Value	21,906	20,212
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	7,991	6,454
Available for sale, Gross Unrealized Gains	86	234
Available for sale, Fair Value	8,077	6,688
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	49,299	43,121
Available for sale, Gross Unrealized Gains	650	594
Available for sale, Gross Unrealized Losses	(571)	(581)
Available for sale, Fair Value	49,378	43,134
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	14,626	17,036
Available for sale, Gross Unrealized Gains	436	84
Available for sale, Gross Unrealized Losses	(155)	(201)
Available for sale, Fair Value	14,907	16,919
Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	287,825	312,372
Available for sale, Gross Unrealized Gains	8,324	2,890
Available for sale, Gross Unrealized Losses	(921)	(1,869)
Available for sale, Fair Value	$ 295,228	$ 313,393

Investment Securities - Summa_2

Investment Securities - Summary of Unrealized and Realized Gains Losses Recognized in Net Income on Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Net gains recognized during the period on equity securities	$ 2	$ 2	$ (3)	$ 3
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date	$ 2	$ 2	$ (3)	$ 3

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	$ 2,045
Due after one year through five years, Amortized Cost	23,428
Due after five years through ten years, Amortized Cost	83,329
Due after ten years, Amortized Cost	179,023
Available for sale, Amortized Cost	287,825
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, Fair Value	2,045
Due after one year through five years, Fair Value	23,833
Due after five years through ten years, Fair Value	85,008
Due after ten years, Fair Value	184,342
Total, Fair Value	$ 295,228	$ 313,393

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortized Cost And Fair Value Debt Securities [Abstract]
Realized gross gains	$ 0	$ 93,000	$ 420,000	$ 268,000
Realized gross losses	$ 0	92,000	39,000	224,000
Proceeds from the sale of investment securities		$ 15,300,000	$ 24,000,000	$ 45,700,000

Investment Securities - Sched_2

Investment Securities - Schedule of Gross Unrealized Losses and Fair Value (Detail) $ in Thousands	Jun. 30, 2020USD ($)Security	Sep. 30, 2019USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	48	121
Fair Value, Less than Twelve Months, Debt	$ 19,450	$ 14,393
Gross Unrealized Losses, Less than Twelve Months, Debt	(240)	(32)
Fair Value, Twelve Months or Greater, Debt	21,591	101,917
Gross Unrealized Losses, Twelve Months or Greater, Debt	(681)	(1,837)
Fair Value Total, Debt	41,041	116,310
Gross Unrealized Losses Total, Debt	$ (921)	$ (1,869)
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	10	48
Fair Value, Less than Twelve Months, Debt	$ 2,470	$ 5,568
Gross Unrealized Losses, Less than Twelve Months, Debt	(31)	(6)
Fair Value, Twelve Months or Greater, Debt	6,406	45,867
Gross Unrealized Losses, Twelve Months or Greater, Debt	(73)	(548)
Fair Value Total, Debt	8,876	51,435
Gross Unrealized Losses Total, Debt	$ (104)	$ (554)
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	1	32
Fair Value, Less than Twelve Months, Debt	$ 348	$ 765
Gross Unrealized Losses, Less than Twelve Months, Debt	(3)
Fair Value, Twelve Months or Greater, Debt		29,661
Gross Unrealized Losses, Twelve Months or Greater, Debt		(331)
Fair Value Total, Debt	348	30,426
Gross Unrealized Losses Total, Debt	$ (3)	$ (331)
Governmental National Mortgage Association [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	6	12
Fair Value, Less than Twelve Months, Debt	$ 3,981	$ 345
Gross Unrealized Losses, Less than Twelve Months, Debt	(55)	(1)
Fair Value, Twelve Months or Greater, Debt	3,606	8,242
Gross Unrealized Losses, Twelve Months or Greater, Debt	(33)	(197)
Fair Value Total, Debt	7,587	8,587
Gross Unrealized Losses Total, Debt	$ (88)	$ (198)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security		2
Fair Value, Less than Twelve Months, Debt		$ 2,159
Gross Unrealized Losses, Less than Twelve Months, Debt		(4)
Fair Value Total, Debt		2,159
Gross Unrealized Losses Total, Debt		$ (4)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	21	13
Fair Value, Less than Twelve Months, Debt	$ 12,651	$ 2,063
Gross Unrealized Losses, Less than Twelve Months, Debt	(151)	(5)
Fair Value, Twelve Months or Greater, Debt	7,594	12,015
Gross Unrealized Losses, Twelve Months or Greater, Debt	(420)	(576)
Fair Value Total, Debt	20,245	14,078
Gross Unrealized Losses Total, Debt	$ (571)	$ (581)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Debt | Security	10	14
Fair Value, Less than Twelve Months, Debt		$ 3,493
Gross Unrealized Losses, Less than Twelve Months, Debt		(16)
Fair Value, Twelve Months or Greater, Debt	$ 3,985	6,132
Gross Unrealized Losses, Twelve Months or Greater, Debt	(155)	(185)
Fair Value Total, Debt	3,985	9,625
Gross Unrealized Losses Total, Debt	$ (155)	$ (201)

Loans Receivable, Net and All_3

Loans Receivable, Net and Allowance for Loan Losses - Summary of Loans Receivable (Detail) - USD ($)	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018
Real estate loans:
Total Loans	$ 1,437,462,000		$ 1,341,283,000
Less allowance for loan losses	14,330,000	$ 13,179,000	12,630,000	$ 12,606,000	$ 12,389,000	$ 11,688,000
Net loans	1,423,132,000		1,328,653,000
Obligations of States and Political Subdivisions [Member]
Real estate loans:
Total Loans	77,792,000		71,828,000
Less allowance for loan losses	544,000	359,000	343,000	338,000	294,000	323,000
Home Equity Loans and Lines of Credit [Member]
Real estate loans:
Total Loans	42,159,000		45,156,000
Less allowance for loan losses	336,000	351,000	329,000	328,000	295,000	296,000
Auto Loans [Member]
Real estate loans:
Total Loans	48,920,000		81,983,000
Less allowance for loan losses	963,000	1,104,000	1,384,000	1,528,000	1,608,000	1,859,000
Net loans	687,000
Other [Member]
Real estate loans:
Total Loans	2,434,000		2,924,000
Less allowance for loan losses	24,000	29,000	28,000	27,000	27,000	23,000
Residential [Member] | Real Estate Loans [Member]
Real estate loans:
Total Loans	605,307,000		597,514,000
Less allowance for loan losses	4,367,000	4,330,000	4,243,000	4,029,000	3,742,000	3,605,000
Construction [Member] | Real Estate Loans [Member]
Real estate loans:
Total Loans	10,305,000		5,672,000
Less allowance for loan losses	103,000	55,000	53,000	59,000	59,000	35,000
Commercial [Member]
Real estate loans:
Net loans	144,600,000
Commercial [Member] | Real Estate Loans [Member]
Real estate loans:
Total Loans	508,056,000		480,647,000
Less allowance for loan losses	6,870,000	4,563,000	3,806,000	3,624,000	3,816,000	3,458,000
Commercial Loans [Member]
Real estate loans:
Total Loans	142,489,000		55,559,000
Less allowance for loan losses	974,000	$ 2,180,000	$ 1,870,000	$ 1,901,000	$ 1,865,000	$ 1,462,000
Net loans	$ 5,500,000

Loans Receivable, Net and All_4

Loans Receivable, Net and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2020USD ($)LoanContract	Jun. 30, 2019Contract	Jun. 30, 2020USD ($)ContractCustomer	Jun. 30, 2019USD ($)Contract	Sep. 30, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Criteria in internal rating system			Ten-point
Categories considered as not criticized			six
Days past due over which loans are considered as substandard			90 days
Minimum internal review amount	$ 750,000		$ 750,000
Minimum external review amount	$ 1,000,000		$ 1,000,000
Payment relief loan reported as percentage of loans outstanding	12.40%		12.40%
Loan, total	$ 1,423,132,000		$ 1,423,132,000		$ 1,328,653,000
Number of Contracts | Contract	0	0
Number of troubled debt restructuring loans granted interest rate concession | Contract			1	1
Troubled debt restructurings loans granted interest rate concession			$ 534,000	$ 81,000
Number of troubled debt restructuring loans granted terms concessions | Contract				1
Troubled debt restructurings granted terms concession				$ 14,000
Number of troubled debt restructuring loans granted terms and rate concessions | Contract				3
Troubled debt restructurings granted terms and rate concession				$ 180,000
Number of troubled debt restructurings, loan modified, defaulted within one year of modification | Contract	0	0	0	0
Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, total	$ 27,800,000		$ 27,800,000
Mortgage Loans [Member] | Payment Deferrals or Payments of Interest Only [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of customers | Customer			169
Auto Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, total	687,000		$ 687,000
Number of Contracts | Contract				1
Auto Loans [Member] | Payment Deferrals or Payments of Interest Only [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of customers | Customer			55
Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract			1	5
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, total	5,500,000		$ 5,500,000
Commercial Loans [Member] | Payment Deferrals or Payments of Interest Only [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, total	150,100,000		$ 150,100,000
Number of customers | Customer			222
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, total	$ 144,600,000		$ 144,600,000
Payroll Protection Program [Member] | Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | Loan	637
Loans originated	$ 75,600		$ 75,600
Guaranteed loans maturity period			two years

Loans Receivable, Net and All_5

Loans Receivable, Net and Allowance for Loan Losses - Summary of Additional Information Regarding Loans Acquired and Accounted (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,437,462	$ 1,341,283
Loans Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,198	1,392
Carrying amount	$ 1,112	$ 1,299

Loans Receivable, Net and All_6

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,437,462	$ 1,341,283
Individually Evaluated for Impairment	18,333	8,376
Collectively Evaluated for Impairment	1,418,017	1,331,608
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,112	1,299
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	77,792	71,828
Collectively Evaluated for Impairment	77,792	71,828
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	42,159	45,156
Individually Evaluated for Impairment	271	400
Collectively Evaluated for Impairment	41,888	44,756
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	48,920	81,983
Individually Evaluated for Impairment	139	583
Collectively Evaluated for Impairment	48,781	81,400
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,434	2,924
Individually Evaluated for Impairment	13	31
Collectively Evaluated for Impairment	2,421	2,893
Residential [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	605,307	597,514
Individually Evaluated for Impairment	3,951	4,281
Collectively Evaluated for Impairment	601,356	593,233
Construction [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,305	5,672
Collectively Evaluated for Impairment	10,305	5,672
Commercial [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	508,056	480,647
Individually Evaluated for Impairment	11,479	2,633
Collectively Evaluated for Impairment	495,465	476,715
Commercial [Member] | Real Estate Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,112	1,299
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	142,489	55,559
Individually Evaluated for Impairment	2,480	448
Collectively Evaluated for Impairment	$ 140,009	$ 55,111

Loans Receivable, Net and All_7

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Investment and Unpaid Principal Balances for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 18,333		$ 18,333		$ 8,376
Unpaid Principal Balance	21,915		21,915		12,146
Associated Allowance	192		192		248
Average Recorded Investment	12,166	$ 10,033	9,438	$ 9,216
Interest Income Recognized	1	2	8	61
With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	17,443		17,443		7,250
Unpaid Principal Balance	20,275		20,275		10,788
Average Recorded Investment	11,364	8,133	8,660	7,721
Interest Income Recognized	1	2	8	61
With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	890		890		1,126
Unpaid Principal Balance	1,640		1,640		1,358
Associated Allowance	192		192		248
Average Recorded Investment	802	1,900	778	1,495
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	271		271		400
Unpaid Principal Balance	387		387		465
Average Recorded Investment	250	241	255	223
Home Equity Loans and Lines of Credit [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	252		252		400
Unpaid Principal Balance	347		347		465
Average Recorded Investment	244	231	253	204
Home Equity Loans and Lines of Credit [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	19		19
Unpaid Principal Balance	40		40
Average Recorded Investment	6	10	2	19
Auto Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	139		139		583
Unpaid Principal Balance	219		219		674
Associated Allowance	42		42		144
Average Recorded Investment	159	332	258	320
Interest Income Recognized		1	1	2
Auto Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	46		46		161
Unpaid Principal Balance	120		120		248
Average Recorded Investment	74	130	130	101
Interest Income Recognized		1	1	2
Auto Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	93		93		422
Unpaid Principal Balance	99		99		426
Associated Allowance	42		42		144
Average Recorded Investment	85	202	128	219
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13		13		31
Unpaid Principal Balance	53		53		39
Associated Allowance					6
Average Recorded Investment	13	5	22	13
Other [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13		13		15
Unpaid Principal Balance	53		53		22
Average Recorded Investment	13	5	14	13
Other [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment					16
Unpaid Principal Balance					17
Associated Allowance					6
Average Recorded Investment			8
Residential [Member] | Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,951		3,951		4,281
Unpaid Principal Balance	5,114		5,114		5,707
Associated Allowance	28		28		36
Average Recorded Investment	3,963	4,025	4,104	4,574
Interest Income Recognized	1	1	2	4
Residential [Member] | Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3,563		3,563		3,935
Unpaid Principal Balance	4,691		4,691		5,309
Average Recorded Investment	3,602	3,451	3,800	3,728
Interest Income Recognized	1	1	2	4
Residential [Member] | Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	388		388		346
Unpaid Principal Balance	423		423		398
Associated Allowance	28		28		36
Average Recorded Investment	361	574	304	846
Commercial [Member] | Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,479		11,479		2,633
Unpaid Principal Balance	13,586		13,586		4,563
Associated Allowance	40		40		56
Average Recorded Investment	5,290	4,147	3,442	3,551
Interest Income Recognized			1	54
Commercial [Member] | Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	11,257		11,257		2,385
Unpaid Principal Balance	12,676		12,676		4,269
Average Recorded Investment	5,108	3,856	3,203	3,425
Interest Income Recognized			1	54
Commercial [Member] | Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	222		222		248
Unpaid Principal Balance	910		910		294
Associated Allowance	40		40		56
Average Recorded Investment	182	291	239	126
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,480		2,480		448
Unpaid Principal Balance	2,556		2,556		698
Associated Allowance	82		82		6
Average Recorded Investment	2,491	1,283	1,357	535
Interest Income Recognized			4	1
Commercial Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,312		2,312		354
Unpaid Principal Balance	2,388		2,388		475
Average Recorded Investment	2,323	460	1,260	250
Interest Income Recognized			4	1
Commercial Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	168		168		94
Unpaid Principal Balance	168		168		223
Associated Allowance	82		82		$ 6
Average Recorded Investment	$ 168	$ 823	$ 97	$ 285

Loans Receivable, Net and All_8

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio, Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 1,423,132	$ 1,328,653
Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	728,337	608,034
Commercial And Municipal Portfolio Segment | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	508,056	480,647
Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	142,489	55,559
Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	77,792	71,828
Commercial And Municipal Portfolio Segment | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	704,950	586,015
Commercial And Municipal Portfolio Segment | Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	487,303	461,701
Commercial And Municipal Portfolio Segment | Pass [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	139,855	52,486
Commercial And Municipal Portfolio Segment | Pass [Member] | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	77,792	71,828
Commercial And Municipal Portfolio Segment | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	6,683	7,492
Commercial And Municipal Portfolio Segment | Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	6,683	7,492
Commercial And Municipal Portfolio Segment | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	16,704	14,527
Commercial And Municipal Portfolio Segment | Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	14,070	11,454
Commercial And Municipal Portfolio Segment | Substandard [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 2,634	$ 3,073

Loans Receivable, Net and All_9

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Performing or Non-Performing Loans (Detail) - USD ($)	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,423,132,000	$ 1,328,653,000
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	709,125,000	733,249,000
Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	42,159,000	45,156,000
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	687,000
Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	48,920,000	81,983,000
Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,434,000	2,924,000
Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	704,176,000	727,313,000
Performing [Member] | Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	41,806,000	44,534,000
Performing [Member] | Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	48,753,000	81,317,000
Performing [Member] | Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,421,000	2,883,000
Non-performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,949,000	5,936,000
Non-performing [Member] | Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	353,000	622,000
Non-performing [Member] | Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	167,000	666,000
Non-performing [Member] | Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,000	41,000
Residential [Member] | Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	605,307,000	597,514,000
Residential [Member] | Performing [Member] | Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	600,891,000	592,907,000
Residential [Member] | Non-performing [Member] | Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,416,000	4,607,000
Construction [Member] | Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,305,000	5,672,000
Construction [Member] | Performing [Member] | Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 10,305,000	$ 5,672,000

Loans Receivable, Net and Al_10

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio Summarized by Aging Categories (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,413,580	$ 1,326,792
31-60 Days Past Due	2,134	3,717
61-89 Days Past Due	1,443	468
Non-accrual	19,193	9,007
Total Past Due	22,770	13,192
Purchased Credit Impaired, Accruing	236	243
Purchased Credit Impaired, Nonaccrual	876	1,056
Total Loans	1,437,462	1,341,283
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	77,792	71,828
Total Loans	77,792	71,828
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	41,625	44,319
31-60 Days Past Due	68	47
61-89 Days Past Due	113	168
Non-accrual	353	622
Total Past Due	534	837
Total Loans	42,159	45,156
Auto Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	48,048	80,090
31-60 Days Past Due	687	1,227
61-89 Days Past Due	18
Non-accrual	167	666
Total Past Due	872	1,893
Total Loans	48,920	81,983
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,408	2,883
61-89 Days Past Due	13
Non-accrual	13	41
Total Past Due	26	41
Total Loans	2,434	2,924
Residential [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	598,797	590,457
31-60 Days Past Due	1,259	2,187
61-89 Days Past Due	835	263
Non-accrual	4,416	4,607
Total Past Due	6,510	7,057
Total Loans	605,307	597,514
Construction [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,305	5,672
Total Loans	10,305	5,672
Commercial [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	495,110	476,644
31-60 Days Past Due	89	236
61-89 Days Past Due	334
Non-accrual	11,411	2,468
Total Past Due	11,834	2,704
Purchased Credit Impaired, Accruing	236	243
Purchased Credit Impaired, Nonaccrual	876	1,056
Total Loans	508,056	480,647
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	139,495	54,899
31-60 Days Past Due	31	20
61-89 Days Past Due	130	37
Non-accrual	2,833	603
Total Past Due	2,994	660
Total Loans	$ 142,489	$ 55,559

Loans Receivable, Net and Al_11

Loans Receivable, Net and Allowance for Loan Losses - Summary of Changes in Primary Segments of ALL (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	$ 13,179	$ 12,389	$ 12,630	$ 11,688
Charge-offs	(217)	(397)	(924)	(1,467)
Recoveries	68	214	449	509
Provision	1,300	400	2,175	1,876
Balance, End of period	14,330	12,606	14,330	12,606
Individually evaluated for impairment	192		192		$ 248
Collectively evaluated for impairment	14,138		14,138		12,382
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	2,180	1,865	1,870	1,462
Charge-offs		(5)		(27)
Recoveries			1
Provision	(1,206)	41	(897)	466
Balance, End of period	974	1,901	974	1,901
Individually evaluated for impairment	82		82		6
Collectively evaluated for impairment	892		892		1,864
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	208	683	574	627
Provision	(59)	89	(425)	145
Balance, End of period	149	772	149	772
Collectively evaluated for impairment	149		149		574
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	4,330	3,742	4,243	3,605
Charge-offs	(42)	(49)	(72)	(322)
Recoveries	1	23	7	32
Provision	78	313	189	714
Balance, End of period	4,367	4,029	4,367	4,029
Individually evaluated for impairment	28		28		36
Collectively evaluated for impairment	4,339		4,339		4,207
Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	55	59	53	35
Provision	48		50	24
Balance, End of period	103	59	103	59
Collectively evaluated for impairment	103		103		53
Real Estate Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	4,563	3,816	3,806	3,458
Charge-offs	(4)	(114)	(54)	(121)
Recoveries	17	18	77	30
Provision	2,294	(96)	3,041	257
Balance, End of period	6,870	3,624	6,870	3,624
Individually evaluated for impairment	40		40		56
Collectively evaluated for impairment	6,830		6,830		3,750
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	359	294	343	323
Provision	185	44	201	15
Balance, End of period	544	338	544	338
Collectively evaluated for impairment	544		544		343
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	351	295	329	296
Charge-offs	(21)		(61)	(19)
Recoveries	1	2	4	5
Provision	5	31	64	46
Balance, End of period	336	328	336	328
Collectively evaluated for impairment	336		336		329
Auto Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,104	1,608	1,384	1,859
Charge-offs	(135)	(229)	(717)	(967)
Recoveries	49	170	358	439
Provision	(55)	(21)	(62)	197
Balance, End of period	963	1,528	963	1,528
Individually evaluated for impairment	42		42		144
Collectively evaluated for impairment	921		921		1,240
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	29	27	28	23
Charge-offs	(15)		(20)	(11)
Recoveries	0	1	2	3
Provision	10	(1)	14	12
Balance, End of period	24	$ 27	24	$ 27
Individually evaluated for impairment					6
Collectively evaluated for impairment	$ 24		$ 24		$ 22

Loans Receivable, Net and Al_12

Loans Receivable, Net and Allowance for Loan Losses - Summary of Troubled Debt Restructuring Granted (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020Contract	Jun. 30, 2019Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			1	2
Pre-Modification Outstanding Recorded Investment			$ 534	$ 95
Post-Modification Outstanding Recorded Investment			$ 534	$ 95
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract				2
Pre-Modification Outstanding Recorded Investment				$ 159
Post-Modification Outstanding Recorded Investment				$ 159
Auto Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract				1
Pre-Modification Outstanding Recorded Investment				$ 21
Post-Modification Outstanding Recorded Investment				$ 21
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			1	5
Pre-Modification Outstanding Recorded Investment			$ 534	$ 275
Post-Modification Outstanding Recorded Investment			$ 534	$ 275

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits by Major Classifications (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Deposits Liabilities Disclosures [Abstract]
Non-interest bearing demand accounts	$ 235,783	$ 175,932
Interest bearing demand accounts	238,426	224,673
Money market accounts	351,463	364,635
Savings and club accounts	159,043	135,012
Certificates of deposit	500,120	442,578
Total	$ 1,484,835	$ 1,342,830

Net Periodic Benefit Cost-Def_3

Net Periodic Benefit Cost-Defined Benefit Plan - Summary of the Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Compensation Related Costs [Abstract]
Interest Cost	$ 121	$ 174	$ 364	$ 520
Expected return on plan assets	(268)	(293)	(807)	(878)
Net periodic benefit cost	$ (147)	$ (119)	$ (443)	$ (358)

Equity Incentive Plan - Additio

Equity Incentive Plan - Additional Information (Detail) - USD ($)	Mar. 02, 2016	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Compensation Related Costs Disclosure [Line Items]
Share-based compensation expense				$ 415,000	$ 421,000
2007 Equity Incentive Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant	2,377,326
Further number of shares, grants	0
2016 Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant		250,000		250,000
Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Number of available shares	1,698,090
Restricted Stock [Member]
Compensation Related Costs Disclosure [Line Items]
Number of available shares	679,236
Share-based compensation expense		$ 82,000	$ 71,000	$ 415,000	$ 421,000
Expected future expense				$ 649,000
Remaining vesting periods				3 years 3 months
Restricted Stock [Member] | Minimum [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period				3 months
Restricted Stock [Member] | Maximum [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period				39 months

Equity Incentive Plan - Schedul

Equity Incentive Plan - Schedule of Restricted Stock Option Activity (Detail) - Restricted Stock [Member]	9 Months Ended
	Jun. 30, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Stock, Nonvested at September 30, 2019	34,963
Number of Restricted Stock, Granted	33,367
Number of Restricted Stock, Vested	(8,819)
Number of Restricted Stock, Forfeited	(2,442)
Number of Restricted Stock, Nonvested at June 30, 2020	57,069
Weighted-average Grant Date Fair Value, Nonvested at September 30, 2019 | $ / shares	$ 16.13
Weighted-average Grant Date Fair Value, Granted | $ / shares	16.19
Weighted-average Grant Date Fair Value, Vested | $ / shares	16.25
Weighted-average Grant Date Fair Value, Nonvested at June 30, 2020 | $ / shares	$ 16.17

Fair Value - Schedule of Fair V

Fair Value - Schedule of Fair Value For Assets and Liabilities Required to be Measured and Reported at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Assets
Total Debt Securities	$ 295,228	$ 313,393
Fair Value, Measurements, Recurring [Member]
Assets
Total Debt Securities	295,228	313,393
Equity securities- financial services	23	25
Derivatives and hedging activities	2,232	303
Liabilities
Derivatives and hedging activities	7,609	1,011
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]
Assets
Total Debt Securities	200,960	226,440
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
Assets
Total Debt Securities	21,906	20,212
Fair Value, Measurements, Recurring [Member] | U.S. Government Agency Securities [Member]
Assets
Total Debt Securities	8,077	6,688
Fair Value, Measurements, Recurring [Member] | Corporate Obligations [Member]
Assets
Total Debt Securities	49,378	43,134
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Assets
Total Debt Securities	14,907	16,919
Fair Value, Measurements, Recurring [Member] | Level I [Member]
Assets
Equity securities- financial services	23	25
Fair Value, Measurements, Recurring [Member] | Level II [Member]
Assets
Total Debt Securities	288,441	305,601
Derivatives and hedging activities	2,232	303
Liabilities
Derivatives and hedging activities	7,609	1,011
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Mortgage-Backed Securities [Member]
Assets
Total Debt Securities	200,960	226,440
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Obligations of States and Political Subdivisions [Member]
Assets
Total Debt Securities	21,906	20,212
Fair Value, Measurements, Recurring [Member] | Level II [Member] | U.S. Government Agency Securities [Member]
Assets
Total Debt Securities	8,077	6,688
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Corporate Obligations [Member]
Assets
Total Debt Securities	42,591	35,342
Fair Value, Measurements, Recurring [Member] | Level II [Member] | Other Debt Securities [Member]
Assets
Total Debt Securities	14,907	16,919
Fair Value, Measurements, Recurring [Member] | Level III [Member]
Assets
Total Debt Securities	6,787	7,792
Fair Value, Measurements, Recurring [Member] | Level III [Member] | Corporate Obligations [Member]
Assets
Total Debt Securities	$ 6,787	$ 7,792

Fair Value - Schedule of Change

Fair Value - Schedule of Changes in Fair Value of Level III Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Beginning balance	$ 7,821	$ 7,733	$ 7,792	$ 7,738
Purchases, sales, issuances, settlements, net	(1,000)		(1,000)
Total unrealized gain (loss):
Included in other comprehensive income (loss)	(34)	89	(5)	84
Ending balance	$ 6,787	$ 7,822	$ 6,787	$ 7,822

Fair Value - Schedule of Fair_2

Fair Value - Schedule of Fair Value For Assets Required to be Measured and Reported at Fair Value on a Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed real estate	$ 412	$ 240
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed real estate	412	240
Impaired loans	18,141	8,128
Level III [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed real estate	412	240
Impaired loans	$ 18,141	$ 8,128

Fair Value - Summary of Additio

Fair Value - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value, Measurements, Nonrecurring [Member] - Level III [Member] $ in Thousands	Jun. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 18,141	$ 8,128
Servicing Asset Valuation Technique Extensible List	essa:AppraisalOfCollateralMember	essa:AppraisalOfCollateralMember
Servicing Asset, Measurement Input [Extensible List]	essa:AppraisalAdjustmentsMember	essa:AppraisalAdjustmentsMember
Fair value input appraisal adjustments	0.206	0.203
Impaired Loans [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	0	0
Impaired Loans [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	0.35	0.35
Foreclosed Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 412	$ 240
Servicing Asset Valuation Technique Extensible List	essa:AppraisalOfCollateralMember	essa:AppraisalOfCollateralMember
Servicing Asset, Measurement Input [Extensible List]	essa:AppraisalAdjustmentsMember	essa:AppraisalAdjustmentsMember
Fair value input appraisal adjustments	0.251	0.266
Foreclosed Real Estate Owned [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	0.20	0.20
Foreclosed Real Estate Owned [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	0.46	0.35

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) $ in Thousands	Jun. 30, 2020USD ($)Loan	Sep. 30, 2019USD ($)Loan
Fair Value Disclosures [Abstract]
Number of impaired loans | Loan	106	138
Impaired loans, carrying value	$ 18,300	$ 8,400
Impaired loans, valuation allowance	192	248
Impaired loans, net fair value	$ 18,100	$ 8,100

Fair Value - Schedule of Carryi

Fair Value - Schedule of Carrying Value and Fair Value for Certain Financial Instruments not Required to be Measured and Reported at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
Financial assets:
Loans receivable, net	$ 18,100	$ 8,100
Bank-owned life insurance	40,310	39,601
Financial liabilities:
Other borrowings	150,827	140,581
Advances by borrowers for taxes and insurance	15,242	6,700
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	170,844	52,242
Loans receivable, net	1,423,132	1,328,653
Accrued interest receivable	6,988	6,225
Regulatory stock	18,581	11,579
Mortgage servicing rights	283	177
Bank-owned life insurance	40,310	39,601
Financial liabilities:
Deposits	1,484,835	1,342,830
Short-term borrowings	138,713	107,701
Other borrowings	150,827	140,581
Advances by borrowers for taxes and insurance	15,242	6,700
Accrued interest payable	1,211	1,384
Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	170,844	52,242
Loans receivable, net	1,424,064	1,313,231
Accrued interest receivable	6,988	6,225
Regulatory stock	18,581	11,579
Mortgage servicing rights	277	241
Bank-owned life insurance	40,310	39,601
Financial liabilities:
Deposits	1,489,085	1,343,315
Short-term borrowings	138,713	107,701
Other borrowings	157,779	141,427
Advances by borrowers for taxes and insurance	15,242	6,700
Accrued interest payable	1,211	1,384
Estimated Fair Value [Member] | Level 1 [Member]
Financial assets:
Cash and cash equivalents	170,844	52,242
Accrued interest receivable	6,988	6,225
Regulatory stock	18,581	11,579
Bank-owned life insurance	40,310	39,601
Financial liabilities:
Deposits	984,715	900,252
Short-term borrowings	138,713	107,701
Advances by borrowers for taxes and insurance	15,242	6,700
Accrued interest payable	1,211	1,384
Estimated Fair Value [Member] | Level 3 [Member]
Financial assets:
Loans receivable, net	1,424,064	1,313,231
Mortgage servicing rights	277	241
Financial liabilities:
Deposits	504,370	443,063
Other borrowings	$ 157,779	$ 141,427

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Summary of Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 193,666	$ 183,637	$ 189,508	$ 179,186
Ending Balance	193,685	188,077	193,685	188,077
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,527)	(477)	(1,527)	(477)
Ending Balance	(1,527)	(477)	(1,527)	(477)
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	4,987	(3,562)	807	(11,369)
Other comprehensive income (loss) before reclassifications	863	3,230	5,344	11,067
Amounts reclassified from accumulated other comprehensive income (loss)		(1)	(301)	(35)
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)				4
Total other comprehensive income (loss)	863	3,229	5,043	11,036
Ending Balance	5,850	(333)	5,850	(333)
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,464)	710	(560)	1,936
Other comprehensive income (loss) before reclassifications	(1,859)	(817)	(3,717)	(1,657)
Amounts reclassified from accumulated other comprehensive income (loss)	85	(203)	39	(589)
Total other comprehensive income (loss)	(1,774)	(1,020)	(3,678)	(2,246)
Ending Balance	(4,238)	(310)	(4,238)	(310)
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	996	(3,329)	(1,280)	(9,910)
Other comprehensive income (loss) before reclassifications	(996)	2,413	1,627	9,410
Amounts reclassified from accumulated other comprehensive income (loss)	85	(204)	(262)	(624)
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)				4
Total other comprehensive income (loss)	(911)	2,209	1,365	8,790
Ending Balance	$ 85	$ (1,120)	$ 85	$ (1,120)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items]
Short-term borrowings interest expense	$ (588)	$ (673)	$ (1,582)	$ (2,922)
Income taxes	(876)	(612)	(2,286)	(1,716)
NET INCOME	3,777	3,047	10,594	8,915
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
NET INCOME	(85)	204	262	624
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized Gains (Losses) on Securities Available for Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on sale of investment securities available for sale, net		1	381	44
Income taxes			(80)	(9)
NET INCOME		1	301	35
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivatives [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term borrowings interest expense	(108)	258	(50)	746
Income taxes	23	(55)	11	(157)
NET INCOME	$ (85)	$ 203	$ (39)	$ 589

Derivatives And Hedging Activ_2

Derivatives And Hedging Activities - Schedule of Fair Value of Derivative Financial Instruments as well as their Classification on Consolidated Balance Sheet (Detail) - Designated as Hedging Instrument [Member] - USD ($)	Jun. 30, 2020	Sep. 30, 2019
Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	$ 74,440,000	$ 50,000,000
Fair Values of Derivative Instruments, Asset	2,232,000	303,000
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	503,639,000	85,000,000
Fair Values of Derivative Instruments, Liability	7,609,000	1,011,000
FHLB Advances [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	25,000,000	50,000,000
Fair Values of Derivative Instruments, Asset	2,000	303,000
FHLB Advances [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	410,000,000	35,000,000
Fair Values of Derivative Instruments, Liability	4,603,000	513,000
Commercial Loans [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	49,440,000
Fair Values of Derivative Instruments, Asset	2,230,000
Commercial Loans [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	68,639,000
Fair Values of Derivative Instruments, Liability	2,244,000
Brokered Deposits [Member] | Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivatives, Notional Amount	25,000,000	50,000,000
Fair Values of Derivative Instruments, Liability	$ 762,000	$ 498,000

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2019USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Interest expense	$ 3,653,000	$ 5,285,000	$ 12,952,000	$ 15,665,000
Interest income	15,853,000	17,000,000	48,710,000	50,997,000
Increase (decrease) in accrued interest payable			(173,000)	578,000
Derivative liability, collateral against obligations	7,200,000		7,200,000			$ 710,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Interest expense	$ 108,000		$ 50,000
Interest income		$ 258,000		$ 746,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Scenario, Forecast [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Increase (decrease) in accrued interest payable					$ 2,500,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Interest Rate Swaps [Member] | Variable Rate [Member] | FHLB Advances, Brokered Certificates and Commercial Loans [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, number of instruments | Contract	49		49
Derivative, notional principal amount	$ 578,100,000		$ 578,100,000

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Schedule of Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items]
Loss Recognized in OCI on Derivative	$ (2,353)	$ (1,034)	$ (4,705)	$ (2,097)
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member]
Derivative Instruments Gain Loss [Line Items]
Loss Recognized in OCI on Derivative	(2,244)	(1,292)	(4,655)	2,842
Gain (Loss) Reclassified from Accumulated OCI into Income	(108)	258	(50)	746
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Cash Flow Hedges of Interest Rate Risk [Member]
Derivative Instruments Gain Loss [Line Items]
Loss Recognized in OCI on Derivative	(2,244)	(1,292)	(4,655)	2,842
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income	$ (108)	$ 258	$ (50)	$ 746

Contingent Liabilities - Additi

Contingent Liabilities - Additional Information (Detail) - Plaintiff	May 29, 2020	Dec. 09, 2019	Dec. 08, 2016
Commitments And Contingencies Disclosure [Abstract]
Number of plaintiffs	3		1
Additional number of plaintiffs		2

Leases - Summary of Balance She

Leases - Summary of Balance Sheet Operating Lease Right-of-Use Assets and Lease Liabilities (Detail) $ in Thousands	Jun. 30, 2020USD ($)
ASSETS
Operating lease right-of-use assets	$ 7,323
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsMember
LIABILITIES
Operating lease Liabilities	$ 7,384
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesMember

Leases - Summary of Lease Term

Leases - Summary of Lease Term and Discount Rate (Detail)	Jun. 30, 2020
Weighted average remaining lease term
Operating leases	13 years 7 months 6 days
Weighted average discount rate
Operating leases	2.39%

Leases - Summary of Components

Leases - Summary of Components of Lease Cost (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Lease Cost [Abstract]
Operating lease cost	$ 259	$ 780
Variable lease cost	61	171
Net lease cost	$ 320	$ 951

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Lease Payments (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Lease Cost [Abstract]
June 30, 2021	$ 1,051
June 30, 2022	937
June 30, 2023	739
June 30, 2024	668
June 30, 2025	527
Thereafter	4,834
Total future minimum lease payments	8,756
Amounts representing interest	(1,372)
Present Value of Net Future Minimum Lease Payments	$ 7,384