ESSA Bancorp (ESSA) 10-Q 9 Aug 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2017	Aug. 07, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	ESSA
Entity Registrant Name	ESSA Bancorp, Inc.
Entity Central Index Key	1,382,230
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,595,744

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
ASSETS
Cash and due from banks	$ 27,023	$ 31,815
Interest-bearing deposits with other institutions	6,536	11,843
Total cash and cash equivalents	33,559	43,658
Certificates of deposit	1,000	1,250
Investment securities available for sale, at fair value	387,608	390,410
Loans receivable (net of allowance for loan losses of $9,221 and $9,056)	1,224,206	1,219,213
Regulatory stock, at cost	15,120	15,463
Premises and equipment, net	16,353	16,844
Bank-owned life insurance	37,368	36,593
Foreclosed real estate	2,859	2,659
Intangible assets, net	2,002	2,487
Goodwill	13,801	13,801
Deferred income taxes	11,231	11,885
Other assets	18,690	18,216
TOTAL ASSETS	1,763,797	1,772,479
LIABILITIES
Deposits	1,216,462	1,214,820
Short-term borrowings	145,665	129,460
Other borrowings	198,168	230,601
Advances by borrowers for taxes and insurance	12,213	4,956
Other liabilities	10,738	16,298
TOTAL LIABILITIES	1,583,246	1,596,135
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; 11,592,699 and 11,393,558 outstanding at June 30, 2017 and September 30, 2016)	181	181
Additional paid in capital	180,772	181,900
Unallocated common stock held by the Employee Stock Ownership Plan (ESOP)	(8,834)	(9,174)
Retained earnings	90,100	87,638
Treasury stock, at cost; 6,540,396 and 6,739,537 shares outstanding at June 30, 2017 and September 30, 2016, respectively	(79,910)	(82,369)
Accumulated other comprehensive loss	(1,758)	(1,832)
TOTAL STOCKHOLDERS’ EQUITY	180,551	176,344
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,763,797	$ 1,772,479

Consolidated Balance Sheet (Un3

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Statement Of Financial Position [Abstract]
Allowance for loan losses	$ 9,221	$ 9,056
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	11,592,699	11,393,558
Treasury stock, shares outstanding	6,540,396	6,739,537

Consolidated Statement of Incom

Consolidated Statement of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
INTEREST INCOME
Loans receivable, including fees	$ 11,819	$ 12,377	$ 35,869	$ 36,756
Investment securities:
Taxable	2,073	1,863	5,990	5,584
Exempt from federal income tax	295	277	907	776
Other investment income	221	206	671	581
Total interest income	14,408	14,723	43,437	43,697
INTEREST EXPENSE
Deposits	2,186	1,903	6,267	5,692
Short-term borrowings	376	175	923	384
Other borrowings	686	786	2,151	2,386
Total interest expense	3,248	2,864	9,341	8,462
NET INTEREST INCOME	11,160	11,859	34,096	35,235
Provision for loan losses	750	600	2,250	1,800
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	10,410	11,259	31,846	33,435
NONINTEREST INCOME
Service fees on deposit accounts	876	919	2,553	2,657
Services charges and fees on loans	285	272	912	849
Trust and investment fees	183	196	547	603
Gain on sale of investments	295	413	295	781
Earnings on Bank-owned life insurance	256	229	775	693
Insurance commissions	181	221	577	637
Other	44	46	102	170
Total noninterest income	2,120	2,296	5,761	6,390
NONINTEREST EXPENSE
Compensation and employee benefits	6,096	5,930	18,329	17,511
Occupancy and equipment	1,106	1,340	3,387	3,871
Professional fees	570	588	2,150	1,713
Data processing	908	998	2,773	2,996
Advertising	254	297	800	537
Federal Deposit Insurance Corporation (FDIC) premiums	245	312	645	912
(Gain) loss on foreclosed real estate	(19)	(77)	(120)	74
Merger related costs				245
Amortization of intangible assets	158	191	485	588
Other	1,002	1,072	2,777	3,096
Total noninterest expense	10,320	10,651	31,226	31,543
Income before income taxes	2,210	2,904	6,381	8,282
Income taxes	448	792	1,051	2,084
NET INCOME	$ 1,762	$ 2,112	$ 5,330	$ 6,198
Earnings per share
Basic	$ 0.16	$ 0.20	$ 0.50	$ 0.60
Diluted	0.16	0.20	0.50	0.59
Dividends per share	$ 0.09	$ 0.09	$ 0.27	$ 0.27

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,762	$ 2,112	$ 5,330	$ 6,198
Investment securities available for sale:
Unrealized holding gain (loss)	1,423	2,360	(7,625)	3,942
Tax effect	(483)	(802)	2,593	(1,341)
Reclassification of gains recognized in net income	(295)	(413)	(295)	(781)
Tax effect	100	141	100	266
Net of tax amount	745	1,286	(5,227)	2,086
Pension plan adjustment:
Pension plan curtailment			7,143
Tax effect			(2,429)
Reclassification adjustment related to actuarial losses	23	119	182	358
Tax effect	(11)	(41)	(67)	(122)
Net of tax amount	12	78	4,829	236
Derivative and hedging activities adjustments:
Changes in unrealized holding gain (loss) on derivative included in net income	(231)		873
Tax effect	78		(399)
Reclassification adjustment for gains on derivatives included in net income	3		(3)
Tax effect	(1)		1
Net of tax amount	(151)		472
Total other comprehensive income	606	1,364	74	2,322
Comprehensive income	$ 2,368	$ 3,476	$ 5,404	$ 8,520

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital [Member]	Unallocated Common Stock Held by the ESOP [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Sep. 30, 2015							$ (2,395)
Net income	$ 6,198
Other comprehensive income	2,322						2,322
Ending Balance at Jun. 30, 2016							(73)
Beginning Balance at Mar. 31, 2016							(1,437)
Net income	2,112
Other comprehensive income	1,364						1,364
Ending Balance at Jun. 30, 2016							(73)
Beginning Balance at Sep. 30, 2016	$ 176,344	$ 181	$ 181,900	$ (9,174)	$ 87,638	$ (82,369)	(1,832)
Beginning Balance, Shares at Sep. 30, 2016	11,393,558	11,393,558
Net income	$ 5,330				5,330
Other comprehensive income	74						74
Cash dividends declared ($0.27 per share)	(2,868)				(2,868)
Stock based compensation	231		231
Allocation of ESOP stock	516		176	340
Allocation of treasury shares to incentive plan	14		(279)			293
Allocation of treasury shares to incentive plan, Shares		23,971
Stock options exercised	$ 910		(1,256)			2,166
Stock options exercised, Shares	544,341	175,170
Ending Balance at Jun. 30, 2017	$ 180,551	$ 181	180,772	(8,834)	90,100	(79,910)	(1,758)
Ending Balance, Shares at Jun. 30, 2017	11,592,699	11,592,699
Beginning Balance at Mar. 31, 2017							(2,364)
Net income	$ 1,762
Other comprehensive income	606						606
Ending Balance at Jun. 30, 2017	$ 180,551	$ 181	$ 180,772	$ (8,834)	$ 90,100	$ (79,910)	$ (1,758)
Ending Balance, Shares at Jun. 30, 2017	11,592,699	11,592,699

Consolidated Statement of Chan7

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parenthetical)	9 Months Ended
	Jun. 30, 2017$ / shares
Cash dividends declared, per share	$ 0.27
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.27

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 5,330	$ 6,198
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,250	1,800
Provision for depreciation and amortization	997	1,314
Amortization and accretion of discounts and premiums, net	3,387	2,851
Gain on sale of investment securities	(295)	(781)
Compensation expense on ESOP	516	455
Stock based compensation	245	141
Increase in accrued interest receivable	(70)	(518)
Increase in accrued interest payable	143	218
Earnings on bank-owned life insurance	(775)	(693)
Deferred federal income taxes	(454)	(687)
Increase (decrease) in accrued pension liability	259	(105)
(Gain) loss on foreclosed real estate	(120)	74
Amortization of intangible assets	485	588
Other, net	2,682	2,945
Net cash provided by operating activities	14,580	13,800
INVESTING ACTIVITIES
Certificates of deposit maturities	250	250
Investment securities available for sale:
Proceeds from sale of investment securities	17,378	45,739
Proceeds from principal repayments and maturities	44,356	61,662
Purchases	(67,932)	(82,454)
Increase in loans receivable, net	(11,555)	(12,692)
Redemption of regulatory stock	16,409	11,867
Purchase of regulatory stock	(16,066)	(13,958)
Proceeds from sale of foreclosed real estate	2,221	1,375
Acquisition, net of cash acquired		(16,174)
Purchase of premises, equipment and software	(453)	(766)
Net cash used for investing activities	(15,392)	(5,151)
FINANCING ACTIVITIES
Increase (decrease) in deposits, net	1,642	(79,687)
Net increase in short-term borrowings	16,205	61,823
Proceeds from other borrowings	43,057	92,300
Repayment of other borrowings	(75,490)	(80,800)
Increase in advances by borrowers for taxes and insurance	7,257	7,881
Purchase of treasury stock shares		(138)
Exercising of stock options	910
Dividends on common stock	(2,868)	(2,808)
Net cash used for financing activities	(9,287)	(1,429)
(Decrease) increase in cash and cash equivalents	(10,099)	7,220
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	43,658	18,758
CASH AND CASH EQUIVALENTS AT END OF PERIOD	33,559	25,978
Cash Paid:
Interest	9,198	8,180
Income taxes	(389)	600
Noncash items:
Transfers from loans to foreclosed real estate	2,301	1,213
Pension plan curtailment	7,143
Unrealized holding (loss) gain	$ (7,920)	3,161
Eagle National Bancorp, Inc [Member]
Noncash assets acquired:
Investment securities, available for sale		36,275
Loans receivable		123,380
Federal Home Loan Bank stock		889
Premises and equipment		945
Accrued interest receivable		185
Intangible assets		1,491
Goodwill		3,542
Deferred tax assets		715
Other assets		1,989
Liabilities assumed:
Certificates of deposit		32,408
Deposits other than certificates of deposit		119,865
Accrued interest payable		64
Other liabilities		900
Net noncash assets acquired		16,174
Cash acquired		$ 8,481

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Jun. 30, 2017
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. On November 6, 2014, the Company converted its status from a savings and loan holding company to a bank holding company. In addition, the Bank converted from a Pennsylvania-chartered savings association to a Pennsylvania-chartered savings 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 subject to regulation and supervision by the Pennsylvania Department of Banking and Securities and the Federal Deposit Insurance Corporation (the “FDIC”). The investment in subsidiary 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, 2017 are not necessarily indicative of the results that may be expected for the year ending September 30, 2017.

Earnings per Share

Earnings per Share	9 Months Ended
	Jun. 30, 2017
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, 2017 and 2016. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2017 2016 2017 2016 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,547,695 ) (6,753,180 ) (6,629,264 ) (6,780,144 ) Average unearned ESOP shares (876,964 ) (922,238 ) (888,324 ) (933,598 ) Average unearned non-vested shares (29,580 ) (31,373 ) (43,801 ) (36,174 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,678,856 10,426,304 10,571,706 10,383,179 Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share 332 297 — — Additional common stock equivalents (stock options) used to calculate diluted earnings per share 63,820 126,538 68,519 125,297 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,743,008 10,553,139 10,640,225 10,508,476 At June 30, 2017 there were 50,310 shares of nonvested stock outstanding at an average weighted price of $14.38 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, 2016 there were 43,692 shares of nonvested stock outstanding at an average weighted price of $12.93 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, 2017
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.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Jun. 30, 2017
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	4. Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606). The amendments in this Update defer the effective date of ASU 2014-09 for all entities by one year. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance in ASU 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. All other entities should apply the guidance in ASU 2014-09 to annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. The Company is evaluating the effect of adopting this new accounting Update. In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In March 2016, the FASB issued ASU 2016-05, Derivatives and Hedging (Topic 815) . Topic 815 For public business entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. For all other entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. An entity has an option to apply the amendments in this Update on either a prospective basis or a modified retrospective basis. Early adoption is permitted, including adoption in an interim period. This Update is not expected to have a significant impact on the Company’s financial statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815) In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606). Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606) Deferral of the Effective Date In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment To simplify the subsequent measurement of goodwill, the FASB eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this Update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting units fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. A public business entity that is a U.S. Securities and Exchange Commission (“SEC”) filer should adopt the amendments in this Update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. A public business entity that is not an SEC filer should adopt the amendments in this Update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2020. All other entities, including not-for-profit entities, that are adopting the amendments in this Update should do so for their annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2021. 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 February 2017, the FASB issued ASU 2017-05, Other Income — Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) The amendments in this Update clarify what constitutes a financial asset within the scope of Subtopic 610-20. The amendments also clarify that entities should identify each distinct nonfinancial asset or in substance nonfinancial asset that is promised to a counterparty and to derecognize each asset when the counterparty obtains control. There is also additional guidance provided for partial sales of a nonfinancial asset and when derecognition, and the related gain or loss, should be recognized. The amendments in this Update are effective at the same time as the amendments in Update 2014-09. Therefore, for public entities, the amendments are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. For all other entities, the amendments in this Update are effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. 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 March 2017, the FASB issued ASU 2017-07, Compensation — Retirement Benefits (Topic 715) The amendments in this Update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost as defined in paragraphs 715-30-35-4 and 715-60-35-9 are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. For public business entities, the amendments in this Update are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. For all other entities, the amendments in the Update are effective for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. 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 March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20). In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718) In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivative and Hedging (Topic 815) Debt—Debt with Conversion and Other Options

Investment Securities

Investment Securities	9 Months Ended
	Jun. 30, 2017
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, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 120,165 $ 142 $ (1,413 ) $ 118,894 Freddie Mac 96,592 138 (938 ) 95,792 Governmental National Mortgage Association 13,433 30 (189 ) 13,274 Total mortgage-backed securities 230,190 310 (2,540 ) 227,960 Obligations of states and political subdivisions 67,990 1,570 (581 ) 68,979 U.S. government agency securities 20,918 77 (6 ) 20,989 Corporate obligations 45,167 221 (634 ) 44,754 Other debt securities 25,250 57 (406 ) 24,901 Total debt securities 389,515 2,235 (4,167 ) 387,583 Equity securities - financial services 25 — — 25 Total $ 389,540 $ 2,235 $ (4,167 ) $ 387,608 September 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 115,535 $ 1,891 $ (173 ) $ 117,253 Freddie Mac 84,486 1,369 (85 ) 85,770 Governmental National Mortgage Association 16,091 76 (28 ) 16,139 Total mortgage-backed securities 216,112 3,336 (286 ) 219,162 Obligations of states and political subdivisions 71,323 2,432 (65 ) 73,690 U.S. government agency securities 25,669 272 — 25,941 Corporate obligations 38,331 599 (512 ) 38,418 Other debt securities 32,962 428 (216 ) 33,174 Total debt securities 384,397 7,067 (1,079 ) 390,385 Equity securities - financial services 25 — — 25 Total $ 384,422 $ 7,067 $ (1,079 ) $ 390,410 The amortized cost and fair value of debt securities at June 30, 2017, 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 $ 16,479 $ 16,482 Due after one year through five years 34,410 34,501 Due after five years through ten years 87,054 87,206 Due after ten years 251,572 249,394 Total $ 389,515 $ 387,583 For the three and nine months ended June 30, 2017, the Company realized gross gains of $299,000 and gross losses of $4,000 on proceeds from the sale of investment securities of $17.4 million. For the three months ended June 30, 2016, the Company realized gross gains of $413,000 and no gross losses on proceeds from the sale of investment securities of $16.7 million. For the nine months ended June 30, 2016, the Company realized gross gains of $781,000 on proceeds from the sale of investment securities of $45.7 million. During the first quarter of fiscal 2016, the Company sold $16.2 million of investment securities which were acquired in the merger with Eagle National Bancorp, Inc (“ENB”). The Company realized no gain or loss from the sale of these securities. 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 (dollars in thousands): June 30, 2017 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 59 $ 75,369 $ (984 ) $ 12,175 $ (429 ) $ 87,544 $ (1,413 ) Freddie Mac 42 53,831 (664 ) 8,775 (274 ) 62,606 (938 ) Governmental National Mortgage Association 9 6,169 (156 ) 3,079 (33 ) 9,248 (189 ) Obligations of states and political subdivisions 24 26,357 (518 ) 1,506 (63 ) 27,863 (581 ) U.S. government agency securities 4 10,992 (6 ) — — 10,992 (6 ) Corporate obligations 24 19,688 (381 ) 6,227 (253 ) 25,915 (634 ) Other debt securities 19 12,782 (287 ) 8,637 (119 ) 21,419 (406 ) Total 181 $ 205,188 $ (2,996 ) $ 40,399 $ (1,171 ) $ 245,587 $ (4,167 ) September 30, 2016 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 17 $ 6,841 $ (21 ) $ 12,261 $ (152 ) $ 19,102 $ (173 ) Freddie Mac 11 7,457 (11 ) 6,375 (74 ) 13,832 (85 ) Governmental National Mortgage Association 5 4,704 (16 ) 1,267 (12 ) 5,971 (28 ) Obligations of states and political subdivisions 12 14,420 (65 ) — — 14,420 (65 ) Corporate obligations 12 8,778 (172 ) 5,303 (340 ) 14,081 (512 ) Other debt securities 13 6,582 (126 ) 6,914 (90 ) 13,496 (216 ) Total 70 $ 48,782 $ (411 ) $ 32,120 $ (668 ) $ 80,902 $ (1,079 ) 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 and corporate debt obligations. The Company reviews its position quarterly and has asserted that at June 30, 2017, 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, 2017
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, 2017 September 30, 2016 Real estate loans: Residential $ 586,871 $ 596,645 Construction 4,404 1,733 Commercial 308,679 288,447 Commercial 40,713 39,978 Obligations of states and political subdivisions 58,264 56,923 Home equity loans and lines of credit 46,704 48,163 Auto Loans 184,688 193,078 Other 3,104 3,302 1,233,427 1,228,269 Less allowance for loan losses 9,221 9,056 Net loans $ 1,224,206 $ 1,219,213 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. Upon acquisition, the Company evaluates whether each acquired loan (regardless of size) is within the scope of ASC 310-30, Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality On the acquisition date, the preliminary estimate of the unpaid principal balance for all loans evidencing credit impairment acquired in the ENB acquisition was $3.5 million and the estimated fair value of the loans was $2.0 million. Total contractually required payments on these loans, including interest, at the acquisition date was $4.2 million. However, the Company’s preliminary estimate of expected cash flows was $2.2 million. At such date, the Company established a credit risk related non-accretable discount (a discount representing amounts which are not expected to be collected from the customer nor liquidation of collateral) of $2.0 million relating to these impaired loans, reflected in the recorded net fair value. Such amount is reflected as a non-accretable fair value adjustment to loans. The Company further estimated the timing and amount of expected cash flows in excess of the estimated fair value and established an accretable discount of $240,000 on the acquisition date relating to these impaired loans. The carrying value of the loans acquired and accounted for in accordance with ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality Unpaid principal balance $ 3,468 Interest 717 Contractual cash flows 4,185 Non-accretable discount (1,973 ) Expected cash flows 2,212 Accretable discount (240 ) Estimated fair value $ 1,972 Changes in the accretable yield for purchased credit-impaired loans were as follows, since acquisition, for the three and nine month periods ended June 30, 2017 and June 30, 2016 (in thousands): For the Three Months Ended June 30, 2017 2016 Balance at beginning of period $ 460 $ 365 Reclassification, new additions and other 33 153 Accretion (32 ) (66 ) Balance at end of period $ 461 $ 452 For the Nine Months Ended June 30, 2017 2016 Balance at beginning of period $ 478 $ 258 Reclassification, new additions and other 151 240 Accretion (168 ) (46 ) Balance at end of period $ 461 $ 452 The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): June 30, 2017 September 30, 2016 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 $ 6,083 $ 6,893 Carrying amount $ 4,911 $ 5,563 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, 2017 Real estate loans: Residential $ 586,871 $ 6,683 $ — $ 580,188 Construction 4,404 — — 4,404 Commercial 308,679 7,633 4,264 296,782 Commercial 40,713 1,501 318 38,894 Obligations of states and political subdivisions 58,264 — — 58,264 Home equity loans and lines of credit 46,704 216 329 46,159 Auto loans 184,688 523 — 184,165 Other 3,104 23 — 3,081 Total $ 1,233,427 $ 16,579 $ 4,911 $ 1,211,937 Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment September 30, 2016 Real estate loans: Residential $ 596,645 $ 8,721 $ — $ 587,924 Construction 1,733 — — 1,733 Commercial 288,447 11,237 4,615 272,595 Commercial 39,978 1,698 411 37,869 Obligations of states and political sub divisions 56,923 — — 56,923 Home equity loans and lines of credit 48,163 361 537 47,265 Auto loans 193,078 526 — 192,552 Other 3,302 22 — 3,280 Total $ 1,228,269 $ 22,565 $ 5,563 $ 1,200,141 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, 2017 With no specific allowance recorded: Real estate loans Residential $ 4,796 $ 6,344 $ — Construction — — — Commercial 6,963 9,650 — Commercial 1,501 1,673 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 212 290 — Auto loans 434 443 — Other 23 29 — Total 13,929 18,429 — With an allowance recorded: Real estate loans Residential 1,887 2,179 197 Construction — — — Commercial 670 688 147 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 4 4 4 Auto loans 89 218 179 Other — — — Total 2,650 3,089 527 Total: Real estate loans Residential 6,683 8,523 197 Construction — — — Commercial 7,633 10,338 147 Commercial 1,501 1,673 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 216 294 4 Auto loans 523 661 179 Other 23 29 — Total Impaired Loans $ 16,579 $ 21,518 $ 527 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2016 With no specific allowance recorded: Real Estate Loans Residential $ 6,721 $ 9,016 $ — Construction — — — Commercial 10,939 12,928 — Commercial 1,698 1,725 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 361 432 — Auto Loans 253 365 — Other 22 22 — Total 19,994 24,488 — With an allowance recorded: Real Estate Loans Residential 2,000 2,151 198 Construction — — — Commercial 298 303 36 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 273 273 113 Other — — — Total 2,571 2,727 347 Total: Real Estate Loans Residential 8,721 11,167 198 Construction — — — Commercial 11,237 13,231 36 Commercial 1,698 1,725 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 361 432 — Auto Loans 526 638 113 Other 22 22 — Total Impaired Loans $ 22,565 $ 27,215 $ 347 The following tables represent 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, 2017 2016 2017 2016 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 4,800 $ 7,365 $ 9 $ 17 Construction — — — — Commercial 8,502 11,590 61 117 Commercial 1,584 1,839 30 37 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 208 502 — — Auto loans 144 241 — — Other 8 13 — — Total 15,246 21,550 100 171 With an allowance recorded: Real estate loans Residential 1,384 2,214 — 3 Construction — — — — Commercial 302 1,565 — — Commercial — — — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 4 98 — — Auto loans 298 291 1 5 Other — — — — Total 1,988 4,168 1 8 Total: Real estate loans Residential 6,184 9,579 9 20 Construction — — — — Commercial 8,804 13,155 61 117 Commercial 1,584 1,839 30 37 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 212 600 — — Auto loans 442 532 1 5 Other 8 13 — — Total Impaired Loans $ 17,234 $ 25,718 $ 101 $ 179 For the Nine Months Ended June 30, 2017 2016 2017 2016 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 5,633 $ 7,815 $ 30 $ 65 Construction — — — — Commercial 9,428 12,469 233 424 Commercial 1,638 1,513 92 89 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 243 615 — 2 Auto loans 127 250 — 2 Other 8 5 — — Total 17,077 22,667 355 582 With an allowance recorded: Real estate loans Residential 1,811 2,495 — 12 Construction — — — — Commercial 330 1,171 — — Commercial 40 3 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 4 77 — — Auto loans 268 217 7 8 Other — — — — Total 2,453 3,963 7 20 Total: Real estate loans Residential 7,444 10,310 30 77 Construction — — — — Commercial 9,758 13,640 233 424 Commercial 1,678 1,516 92 89 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 247 692 — 2 Auto loans 395 467 7 10 Other 8 5 — — Total Impaired Loans $ 19,530 $ 26,630 $ 362 $ 602 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 more than 90 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, 2017 and September 30, 2016 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2017 Commercial real estate loans $ 290,187 $ 4,479 $ 14,013 $ — $ 308,679 Commercial 37,598 164 2,951 — 40,713 Obligations of states and political subdivisions 58,264 — — — 58,264 Total $ 386,049 $ 4,643 $ 16,964 $ — $ 407,656 Pass Special Mention Substandard Doubtful or Loss Total September 30, 2016 Commercial real estate loans $ 260,088 $ 8,886 $ 19,473 $ — $ 288,447 Commercial 36,684 180 3,114 — 39,978 Obligations of states and political subdivisions 56,923 — — — 56,923 Total $ 353,695 $ 9,066 $ 22,587 $ — $ 385,348 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, 2017 and September 30, 2016 (in thousands): Performing Non- performing Purchased Credit Impaired Total June 30, 2017 Real estate loans: Residential $ 579,567 $ 7,304 $ — $ 586,871 Construction 4,404 — — 4,404 Home equity loans and lines of credit 46,101 274 329 46,704 Auto loans 184,020 668 — 184,688 Other 3,064 40 — 3,104 Total $ 817,156 $ 8,286 $ 329 $ 825,771 Performing Non-performing Purchased Impaired Credit Total September 30, 2016 Real estate loans: Residential $ 587,673 $ 8,972 $ — $ 596,645 Construction 1,733 — — 1,733 Home equity loans and lines of credit 47,213 413 537 48,163 Auto loans 192,734 344 — 193,078 Other 3,271 31 — 3,302 Total $ 832,624 $ 9,760 $ 537 $ 842,921 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, 2017 and September 30, 2016 (in thousands): Current 31-60 Days Past Due 61-90 Days Past Due Greater than 90 Days Past Due and still accruing Non-Accrual Total Past Due and Non- Accrual Purchased Credit Impaired Total Loans June 30, 2017 Real estate loans Residential $ 576,780 $ 2,091 $ 696 $ — $ 7,304 $ 10,091 $ — $ 586,871 Construction 4,404 — — — — — — 4,404 Commercial 300,069 157 — — 4,189 4,346 4,264 308,679 Commercial 39,820 19 — — 556 575 318 40,713 Obligations of states and political subdivisions 58,264 — — — — — — 58,264 Home equity loans and lines of credit 45,812 289 — — 274 563 329 46,704 Auto loans 183,290 700 30 — 668 1,398 — 184,688 Other 2,780 284 — — 40 324 — 3,104 Total $ 1,211,219 $ 3,540 $ 726 $ — $ 13,031 $ 17,297 $ 4,911 $ 1,233,427 Current 31-60 Days Past Due 61-90 Days Past Due Greater than 90 Days Past Due and still accruing Non-Accrual Total Past Due and Non- Accrual Purchased Credit Impaired Total Loans September 30, 2016 Real estate loans Residential $ 585,517 $ 1,496 $ 660 $ — $ 8,972 $ 11,128 $ — $ 596,645 Construction 1,733 — — — — — — 1,733 Commercial 279,019 1,093 191 — 3,529 4,813 4,615 288,447 Commercial 38,862 185 57 — 463 705 411 39,978 Obligations of states and political subdivisions 56,923 — — — — — — 56,923 Home equity loans and lines of credit 47,026 40 147 — 413 600 537 48,163 Auto loans 191,785 717 232 — 344 1,293 — 193,078 Other 3,264 7 — — 31 38 — 3,302 Total $ 1,204,129 $ 3,538 $ 1,287 $ — $ 13,752 $ 18,577 $ 5,563 $ 1,228,269 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 allocated 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. 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, 2017 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 month periods ending June 30, 2017 and 2016 (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, 2017 $ 4,130 $ 30 $ 1,038 $ 951 $ 244 $ 445 $ 1,908 $ 24 $ 596 $ 9,366 Charge-offs (23 ) — (649 ) — — — (460 ) — — (1,132 ) Recoveries 11 — 9 1 — 2 213 1 — 237 Provision 88 3 968 34 2 47 205 (2 ) (595 ) 750 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at March 31, 2016 $ 4,655 $ 24 $ 968 $ 738 $ 196 $ 389 $ 1,925 $ 25 $ 495 $ 9,415 Charge-offs (259 ) — (61 ) (5 ) — (11 ) (369 ) — — (705 ) Recoveries 34 — — 5 — 2 37 2 — 80 Provision 57 2 (2 ) 96 5 29 494 (2 ) (79 ) 600 ALL balance at June 30, 2016 $ 4,487 $ 26 $ 905 $ 834 $ 201 $ 409 $ 2,087 $ 25 $ 416 $ 9,390 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (390 ) — (867 ) (20 ) — (6 ) (1,521 ) (4 ) — (2,808 ) Recoveries 18 — 19 1 — 5 673 7 — 723 Provision 152 20 1,362 123 31 40 834 (5 ) (307 ) 2,250 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 Charge-offs (657 ) — (70 ) (8 ) — (110 ) (746 ) — — (1,591 ) Recoveries 37 — 52 7 — 6 154 6 — 262 Provision (33 ) 19 252 142 12 52 1,109 (8 ) 255 1,800 ALL balance at June 30, 2016 $ 4,487 $ 26 $ 905 $ 834 $ 201 $ 409 $ 2,087 $ 25 $ 416 $ 9,390 The Company allocated increased provisions to commercial real estate loans for the three month period ending June 30, 2017 due to increased charge off activity and increased loan balances. Charge offs increased for the quarter ended June 30, 2017 due primarily to the charge off of $414,000 on one commercial real estate loan. The Company allocated increased provisions in auto loans due to increased charge off activity and increased non-performing loans. Acquired loans are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. 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, 2017 and September 30, 2016 (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 $ 197 $ — $ 147 $ — $ — $ 4 $ 179 $ — $ — $ 527 Collectively evaluated for impairment 4,009 33 1,219 986 246 490 1,687 23 1 8,694 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 Individually evaluated for impairment $ 198 $ — $ 36 $ — $ — $ — $ 113 $ — $ — $ 347 Collectively evaluated for impairment 4,228 13 816 882 215 455 1,767 25 308 8,709 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 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 three months ended June 30, 2017 and 2016 (dollars in thousands): For the Three Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 529 $ 529 Construction — — — Commercial — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other — — — Total 3 $ 542 $ 542 For the Three Months Ended June 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 3 $ 248 $ 248 Construction — — — Commercial 1 1,612 1,612 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 1 7 7 Auto loans — — — Other — — — Total 5 $ 1,867 $ 1,867 Of the three new troubled debt restructurings granted for the three months ended June 30, 2017, two loans for $206,000 were granted terms and rate concessions and one loan for $336,000 was granted interest rate concessions. Of the five new troubled debt restructurings granted for the three months ended June 30, 2016, two loans totaling $118,000, were granted term and rate concessions, two loan totaling $1.7 million were granted term concessions and one loan totaling $7,000 was granted a rate concession. The following is a summary of troubled debt restructuring granted during the nine months ended June 30, 2017 and 2016 (dollars in thousands): For the Nine Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 5 $ 902 $ 902 Construction — — — Commercial 1 93 93 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other 1 21 21 Total 8 $ 1,029 $ 1,029 For the Nine Months Ended June 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 7 $ 916 $ 916 Construction — — — Commercial 2 1,689 1,689 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 1 7 7 Auto loans — — — Other — — — Total 10 $ 2,612 $ 2,612 Of the eight new troubled debt restructurings granted for the nine months ended June 30, 2017, one loan totaling $133,000 was granted terms concessions, two loans totaling $357,000 were granted interest rate concessions, and five loans totaling $539,000 were granted terms and rate concessions. Of the ten new troubled debt restructurings granted for the nine months ended June 30, 2016, four loans totaling $690,000 were granted term and rate concessions, four loans totaling $1.8 million were granted term concessions and two loan totaling $84,000 were granted a rate concession. For the three and nine months ended June 30, 2017 and 2016 no loans defaulted on a restructuring agreement within one year of modification. Foreclosed assets acquired in settlement of loans are carried at fair value, less estimated costs to sell, and are included in the Consolidated Balance Sheet. As of June 30, 2017 and September 30, 2016, included with other assets are $2.9 million and $2.7 million, of foreclosed assets, respectively. As of June 30, 2017, included within the foreclosed assets is $1.9 million of consumer residential mortgages that were foreclosed on or received via a deed in lieu transaction prior to the period end. As of June 30, 2017, the Company has initiated formal foreclosure proceedings on $2.0 million of consumer residential mortgages which have not yet been transferred into foreclosed assets.

Deposits

Deposits	9 Months Ended
	Jun. 30, 2017
Banking And Thrift [Abstract]
Deposits	7. Deposits Deposits consist of the following major classifications (in thousands): June 30, 2017 September 30, 2016 Non-interest bearing demand accounts $ 154,705 $ 142,924 Interest bearing demand accounts 156,395 167,259 Money market accounts 244,650 249,947 Savings and club accounts 147,260 142,021 Certificates of deposit 513,452 512,669 Total $ 1,216,462 $ 1,214,820

Net Periodic Benefit Cost-Defin

Net Periodic Benefit Cost-Defined Benefit Plan	9 Months Ended
	Jun. 30, 2017
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, 2016 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, 2017 and 2016 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2017 2016 2017 2016 Service Cost $ 69 $ 249 $ 447 $ 747 Interest Cost 208 246 651 736 Expected return on plan assets (348 ) (311 ) (1,037 ) (933 ) Amortization of unrecognized loss 23 119 182 358 Net periodic benefit cost $ (48 ) $ 303 $ 243 $ 908 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. As a result of the freeze, the Company’s projected benefit obligation decreased by $7.1 million and there was a tax effected $4.7 million increase to accumulated other comprehensive income in the quarter ended March 31, 2017.

Equity Incentive Plan

Equity Incentive Plan	9 Months Ended
	Jun. 30, 2017
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. Certain officers, employees and outside directors were granted in aggregate 1,140,469 NSOs; 317,910 ISOs; and 590,320 shares of restricted stock on May 23, 2008. Certain officers were granted in aggregate 30,000 shares of restricted stock on April 1, 2013, 19,880 shares of restricted stock on July 22, 2014, 21,843 shares of restricted stock on May 20, 2015, 23,491 shares of restricted stock on March 4, 2016, 20,675 shares of restricted stock on December 13, 2016 and 3,296 shares of restricted stock on March 29, 2017. In accordance with generally accepted accounting principles, the Company expenses the fair value of all share-based compensation grants over the requisite service periods. The Company classifies share-based compensation for employees and outside directors within “Compensation and employee benefits” in the Consolidated Statement of Income to correspond with the same line item as compensation paid. Stock options vest over a five-year service period and expire ten years after the grant date. The Company recognized compensation expense for the fair values of these awards, which vested on a straight-line basis over the requisite service period of the awards. The 2013 restricted stock shares vested over an 18 month service period. The 2014 restricted shares vest over a 39 month service period. The 2015 restricted shares vest over a 40 month service period. The March 4, 2016 restricted shares vest over a 43 month service period. The December 13, 2016 restricted shares vest over a 46 month service period. The March 29, 2017 restricted shares vest over 42 months for 1,296 shares and over 18 months for 2,000 shares. 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. For the nine months ended June 30, 2017 and 2016, the Company recorded $231,000 and $325,000 of share-based compensation expense, respectively, comprised of restricted stock expense. Expected future compensation expense relating to the restricted shares issued in 2014, at June 30, 2017 is $16,000 over the remaining vesting period of 0.25 years. Expected future compensation expense relating to the restricted shares issued in 2015, at June 30, 2017 is $102,000 over the remaining vesting period of 1.25 years. Expected future compensation expense relating to the restricted shares issued in March 2016, at June 30, 2017 is $192,000 over the remaining vesting period of 2.25 years. Expected future compensation expense relating to the restricted shares issued in December 2016, at June 30, 2017 is $290,000 over the remaining vesting period of 3.25 years. Expected future compensation expense relating to the restricted shares (1,296) issued in March 2017, at June 30, 2017 is $24,000 over the remaining vesting period of 1.25 years. Expected future compensation expense relating to the restricted shares (2,000) issued in March 2017, at June 30, 2017 is $17,000 over the remaining vesting period of 3.25 years. The following is a summary of the Company’s stock option activity and related information for its option grants for the nine month period ended June 30, 2017. Number of Stock Options Weighted- average Exercise Price Weighted- average Remaining Contractual Term (in Aggregate Intrinsic Value (in thousands) Outstanding at September 30, 2016 905,987 $ 12.35 1.67 $ 1,341 Granted — — — — Exercised 544,341 12.35 0.92 — Forfeited — — — — Outstanding June 30, 2017 361,646 $ 12.35 0.92 $ 857 Exercisable at June 30, 2017 361,646 $ 12.35 0.92 $ 857 The following is a summary of the status of the Company’s restricted stock as of June 30, 2017, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2016 31,896 $ 13.01 Granted 23,971 16.28 Vested — — Forfeited — — Nonvested at June 30, 2017 55,867 $ 14.50

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement	10. Fair Value Measurement 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. The following tables present information about the Company’s securities, derivatives, other real estate owned, impaired loans and mortgage servicing rights measured at fair value as of June 30, 2017 and September 30, 2016 and indicates the fair value hierarchy of the valuation techniques utilized by the Bank to determine such fair value: Fair Value Measurement at June 30, 2017 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of June 30, 2017 Securities available-for-sale measured on a recurring basis Mortgage backed securities $ — $ 227,960 $ — $ 227,960 Obligations of states and political subdivisions — 68,979 — 68,979 U.S. government agencies — 20,989 — 20,989 Corporate obligations — 36,040 8,714 44,754 Other debt securities — 24,901 — 24,901 Equity securities-financial services 25 — — 25 Total debt and equity securities $ 25 $ 378,869 $ 8,714 $ 387,608 Derivatives $ — $ 1,169 $ — $ 1,169 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 2,859 $ 2,859 Impaired loans $ — $ — $ 16,052 $ 16,052 Mortgage servicing rights $ — $ — $ 284 $ 284 Fair Value Measurement at September 30, 2016 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of September 30, 2016 Securities available-for-sale measured on a recurring basis Mortgage backed securities $ — $ 219,162 $ — $ 219,162 Obligations of states and political subdivisions — 73,690 — 73,690 U.S. government agencies — 25,941 — 25,941 Corporate obligations — 31,433 6,985 38,418 Other debt securities — 32,674 500 33,174 Equity securities-financial services 25 — — 25 Total debt and equity securities $ 25 $ 382,900 $ 7,485 $ 390,410 Derivatives $ — $ 453 $ — $ 453 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 2,659 $ 2,659 Impaired loans $ — $ — $ 22,218 $ 22,218 Mortgage Servicing rights $ — $ — $ 398 $ 398 The following tables present 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, 2017 and 2016 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2017 June 30, 2016 Beginning balance $ 8,735 $ 7,136 Purchases, sales, issuances, settlements, net — 3,000 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (21 ) 76 Transfers in and/or out of Level III — — $ 8,714 $ 10,212 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2017 June 30, 2016 Beginning balance $ 7,485 $ 4,211 Purchases, sales, issuances, settlements, net 756 6,000 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income 473 1 Transfers in and/or out of Level III — — $ 8,714 $ 10,212 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 comparables. 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. Mortgage servicing rights are also valued by an independent pricing service. 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, 2017, 161 impaired loans with a carrying value of $16.6 million were reduced by specific valuation allowance totaling $527,000 resulting in a net fair value of $16.1 million based on Level 3 inputs. At September 30, 2016, 205 impaired loans with a carrying value of $22.6 million were reduced by a specific valuation totaling $347,000 resulting in a net fair value of $22.2 million based on Level 3 inputs. 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 (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2017 Impaired loans $ 16,052 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 57% (24.1%) Foreclosed real estate owned 2,859 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 50% (21.9%) Mortgage servicing rights 284 Discounted cash flow Discount rate 11% to 16% (11.6%) Prepayment speeds 10% to 30% (15.7%) Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range September 30, 2016: Impaired loans $ 22,218 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 50% (23.0%) Foreclosed real estate owned 2,659 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 50% (22.1%) Mortgage servicing rights 398 Discounted cash flow Discount rate 12% (12.0%) Prepayment speeds 8% to 33% (17.2%) (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. The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below. Disclosures about Fair Value of Financial Instruments The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below (in thousands). June 30, 2017 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 33,559 $ 33,559 $ — $ — $ 33,559 Certificates of deposit 1,000 — — 1,006 1,006 Investment and mortgage backed securities available for sale 387,608 25 378,869 8,714 387,608 Loans receivable, net 1,224,206 — — 1,221,711 1,221,711 Accrued interest receivable 5,839 5,839 — — 5,839 Regulatory stock 15,120 15,120 — — 15,120 Mortgage servicing rights 284 — — 284 284 Derivatives 1,169 — 1,169 — 1,169 Bank owned life insurance 37,368 37,368 — — 37,368 Financial liabilities: Deposits $ 1,216,462 $ 703,010 $ — $ 514,284 $ 1,217,294 Short-term borrowings 145,665 145,665 — 145,665 Other borrowings 198,168 — — 198,203 198,203 Advances by borrowers for taxes and insurance 12,213 12,213 — — 12,213 Accrued interest payable 1,189 1,189 — — 1,189 September 30, 2016 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 43,658 $ 43,658 $ — $ — $ 43,658 Certificates of deposit 1,250 — — 1,269 1,269 Investment and mortgage backed securities available for sale 390,410 25 382,900 7,485 390,410 Loans receivable, net 1,219,213 — — 1,237,759 1,237,759 Accrued interest receivable 5,769 5,769 — — 5,769 Regulatory stock 15,463 15,463 — — 15,463 Mortgage servicing rights 398 — — 398 398 Derivatives 453 — 453 — 453 Bank owned life insurance 36,593 36,593 — — 36,593 Financial liabilities: Deposits $ 1,214,820 $ 702,151 $ — $ 516,743 $ 1,218,894 Short-term borrowings 129,460 129,460 — — 129,460 Other borrowings 230,601 — — 231,911 231,911 Advances by borrowers for taxes and insurance 4,956 4,956 — — 4,956 Accrued interest payable 1,046 1,046 — — 1,046 Financial instruments are defined as cash, evidence of an ownership interest in an entity, or a contract which creates an obligation or right to receive or deliver cash or another financial instrument from/to a second entity on potentially favorable or unfavorable terms. Fair value is defined as the amount at which a financial instrument could be exchanged in a current transaction between willing parties other than in a forced or liquidation sale. If a quoted market price is available for a financial instrument, the fair value would be calculated based upon the market price per trading unit of the instrument. If no readily available market exists, the fair value for financial instruments should be based upon management’s judgment regarding current economic conditions, interest rate risk, expected cash flows, future estimated losses, and other factors as determined through various option pricing formulas or simulation modeling. As many of these assumptions result from judgments made by management based upon estimates which are inherently uncertain, the resulting values may not be indicative of the amount realizable in the sale of a particular financial instrument. In addition, changes in the assumptions on which the values are based may have a significant impact on the resulting estimated values. As certain assets and liabilities, such as deferred tax assets, premises and equipment, and many other operational elements of the Bank, are not considered financial instruments but have value, this fair value of financial instruments would not represent the full market value of the Company. The Company employed simulation modeling in determining the fair value of financial instruments for which quoted market prices were not available based upon the following assumptions: Cash and Cash Equivalents, Accrued Interest Receivable, Short-Term Borrowings, Advances by Borrowers for Taxes and Insurance, and Accrued Interest Payable The fair value approximates the current book value. Bank-Owned Life Insurance The fair value is equal to the cash surrender value of the Bank-owned life insurance. Investment and Mortgage-Backed Securities Available for Sale and Regulatory Stock The fair value of investment and mortgage-backed securities available for sale is equal to the available quoted market price. If no quoted market price is available, fair value is estimated using the quoted market price for similar securities. Since the Regulatory stock is not actively traded on a secondary market and held exclusively by member financial institutions, the fair market value approximates the carrying amount. For certain securities which are not traded in active markets or are subject to transfer restrictions, valuations are adjusted to reflect illiquidity and/or non-transferability, and such adjustments are generally based on available market evidence (Level 3). In the absence of such evidence, management’s best estimate is used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Internal cash flow models using a present value formula that includes assumptions market participants would use along with indicative exit pricing obtained from broker/dealers (where available) are used to support fair values of certain Level 3 investments, if applicable. Loans Receivable, Net The fair values of loans are estimated using discounted cash flow analyses, using market rates at the balance sheet date that reflect the credit and interest rate-risk inherent in the loans. Projected future cash flows are calculated based upon contractual maturity or call dates, projected repayments and prepayments of principal. Generally, for variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. Mortgage Servicing Rights The Company utilizes a third party provider to estimate the fair value of certain loan servicing rights. Fair value for the purpose of this measurement is defined as the amount at which the asset could be exchanged in a current transaction between willing parties, other than in a forced liquidation. Derivatives Fair values of interest rate cap and interest rate swap contracts are based on dealer quotes. Deposits (including Certificates of Deposit) The fair values disclosed for demand, savings, and money market deposit accounts are valued at the amount payable on demand as of quarter-end. Fair values for time deposits are estimated using a discounted cash flow calculation that applies contractual costs currently being offered in the existing portfolio to current market rates being offered for deposits of similar remaining maturities. Other Borrowings Fair values for other borrowings are estimated using a discounted cash flow calculation that applies contractual costs currently being offered in the existing portfolio to current market rates being offered for other borrowings of similar remaining maturities. Commitments to Extend Credit These financial instruments are generally not subject to sale, and fair values are not readily available. The carrying value, represented by the net deferred fee arising from the unrecognized commitment, and the fair value, determined by discounting the remaining contractual fee over the term of the commitment using fees currently charged to enter into similar agreements with similar credit risk, are not considered material for disclosure.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	11. Accumulated Other Comprehensive Loss The activity in accumulated other comprehensive loss for the three and nine month periods ended June 30, 2017 and 2016 is as follows (in thousands): Accumulated Other Comprehensive Loss Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2017 $ (1,266 ) $ (2,020 ) $ 922 $ (2,364 ) Other comprehensive income (loss) before reclassifications — 940 (153 ) 787 Amounts reclassified from accumulated other comprehensive loss, net of tax 12 (195 ) 2 (181 ) Period change 12 745 (151 ) 606 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Balance at March 31, 2016 $ (5,167 ) $ 3,730 $ — $ (1,437 ) Other comprehensive income before reclassifications — 1,558 — 1,558 Amounts reclassified from accumulated other comprehensive loss, net of tax 78 (272 ) — (194 ) Period change 78 1,286 — 1,364 Balance at June 30, 2016 $ (5,089 ) $ 5,016 $ — $ (73 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Other comprehensive income (loss) before reclassifications 4,714 (5,032 ) 474 156 Amounts reclassified from accumulated other comprehensive loss, net of tax 115 (195 ) (2 ) (82 ) Period change 4,829 (5,227 ) 472 74 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ — $ (2,395 ) Other comprehensive income before reclassifications — 2,601 — 2,601 Amounts reclassified from accumulated other comprehensive loss, net of tax 236 (515 ) — (279 ) Period change 236 2,086 — 2,322 Balance at June 30, 2016 $ (5,089 ) $ 5,016 $ — $ (73 ) The following tables present significant amounts reclassified out of each component of accumulated other comprehensive loss for the three and nine month periods ended June 30, 2017 and 2016 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2017 2016 Securities available for sale: Securities gains reclassified into earnings $ 295 $ 413 Gain on sale of investments Related income tax expense (100 ) (141 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 272 Defined benefit pension plan: Amortization of net loss (23 ) (119 ) Compensation and employee Related income tax expense 11 41 Income taxes Net effect on accumulated other comprehensive loss for the period (12 ) (78 ) Derivatives and hedging activities: Interest expense, effective portion (3 ) — Interest expense Related income tax expense 1 — Income taxes Net effect on accumulated other comprehesive loss for the period (2 ) — Total reclassification for the period $ 181 $ 194 Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2017 2016 Securities available for sale: Securities gains reclassified into earnings $ 295 $ 781 Gain on sale of investments Related income tax expense (100 ) (266 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 515 Defined benefit pension plan: Amortization of net loss (182 ) (358 ) Compensation and employee benefits Related income tax expense 67 122 Income taxes Net effect on accumulated other comprehensive loss for the period (115 ) (236 ) Derivative and hedging activities: Interest expense, effective portion 3 — Interest expense Related income tax expense (1 ) — Income taxes Net effect on accumulated other comprehensive loss for the period 2 — Total reclassification for the period $ 82 $ 279

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Jun. 30, 2017
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, 2017 and September 30, 2016 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2017 As of September 30, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest Rate Products Other Assets $ 1,169 Other Assets $ 453 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, 2017, the Company had three interest rate swaps with a notional principal amount of $50 million associated with the Company’s cash outflows associated with various FHLB advances. 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 period ended June 30, 2017. Amounts reported in accumulated other comprehensive 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, 2017, the Company had $3,000 of gains reclassified to interest expense. During the nine months ended June 30, 2017, the Company had $3,000 of losses reclassified to interest expense. During the next twelve months, the Company estimates that $0 will be reclassified as a decrease in interest expense. The tables below present the pre-tax net gains (losses) of the Company’s cash flow hedges for the three and nine month periods ended June 30, 2017 and 2016, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow 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) Gain Reclassified from Accumulated OCI into Income (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended June 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 153 $ — Interest expense $ 3 $ — Other non-interest income $ — $ — Ending balance of OCI Total $ 153 $ — $ 3 $ — $ — $ — Derivatives in Cash Flow Hedging Relationships Gain 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)Reclassified from Accumulated OCI into Income (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Nine Months Ended June 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 474 $ — Interest expense $ (3 ) $ — Other non-interest income $ — $ — Ending balance of OCI Total $ 474 $ — $ (3 ) $ — $ — $ — 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, 2017 the Company had no derivatives in a net liability position and was not required to post collateral against its obligations under these agreements. If the Company had breached any of these provisions at June 30, 2017, 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, 2017
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 the defendant in an action commenced on September 13, 2016 by one plaintiff that is pending in the court of Common Pleas of Philadelphia County, Pennsylvania. The plaintiff alleges that the Bank repossessed motor vehicles, sold the vehicles and sought to collect deficiency balances in a manner that did not comply with the notice requirements of the Pennsylvania Uniform Commercial Code (UCC). The plaintiff seeks to pursue the action as a class action on behalf of the named plaintiff and other similarly situated plaintiffs who had their automobiles repossessed and seek to recover damages under the UCC. The Bank denies the plaintiff’s allegations and intends to vigorously 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. 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, Inc., in the process of making loans, received unearned fees and kickbacks in violation of the Real Estate Settlement Procedures Act. The Bank intends to vigorously 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.

Recent Accounting Pronounceme22

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Jun. 30, 2017
Accounting Changes And Error Corrections [Abstract]
Revenue from Contracts with Customers	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606). The amendments in this Update defer the effective date of ASU 2014-09 for all entities by one year. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance in ASU 2014-09 to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. All other entities should apply the guidance in ASU 2014-09 to annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. The Company is evaluating the effect of adopting this new accounting Update. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606). Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606) Deferral of the Effective Date In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date
Financial Instruments	In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments
Lease	In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)
Derivatives and Hedging	In March 2016, the FASB issued ASU 2016-05, Derivatives and Hedging (Topic 815) . Topic 815 For public business entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. For all other entities, the amendments in this Update are effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within fiscal years beginning after December 15, 2018. An entity has an option to apply the amendments in this Update on either a prospective basis or a modified retrospective basis. Early adoption is permitted, including adoption in an interim period. This Update is not expected to have a significant impact on the Company’s financial statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815)
Statement of Cash Flows	In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments
Business Combinations	In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business
Goodwill Impairment	In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment To simplify the subsequent measurement of goodwill, the FASB eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under the amendments in this Update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting units fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. A public business entity that is a U.S. Securities and Exchange Commission (“SEC”) filer should adopt the amendments in this Update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. A public business entity that is not an SEC filer should adopt the amendments in this Update for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2020. All other entities, including not-for-profit entities, that are adopting the amendments in this Update should do so for their annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2021. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations.
Other Income	In February 2017, the FASB issued ASU 2017-05, Other Income — Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) The amendments in this Update clarify what constitutes a financial asset within the scope of Subtopic 610-20. The amendments also clarify that entities should identify each distinct nonfinancial asset or in substance nonfinancial asset that is promised to a counterparty and to derecognize each asset when the counterparty obtains control. There is also additional guidance provided for partial sales of a nonfinancial asset and when derecognition, and the related gain or loss, should be recognized. The amendments in this Update are effective at the same time as the amendments in Update 2014-09. Therefore, for public entities, the amendments are effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. For all other entities, the amendments in this Update are effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact the adoption of the standard will have on the Company’s financial position or results of operations.
Compensation	In March 2017, the FASB issued ASU 2017-07, Compensation — Retirement Benefits (Topic 715) The amendments in this Update require that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost as defined in paragraphs 715-30-35-4 and 715-60-35-9 are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. For public business entities, the amendments in this Update are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. For all other entities, the amendments in the Update are effective for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. 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 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718)
Receivables	In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20).
Earnings Per Share	In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivative and Hedging (Topic 815) Debt—Debt with Conversion and Other Options

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2017
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, 2017 and 2016. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2017 2016 2017 2016 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,547,695 ) (6,753,180 ) (6,629,264 ) (6,780,144 ) Average unearned ESOP shares (876,964 ) (922,238 ) (888,324 ) (933,598 ) Average unearned non-vested shares (29,580 ) (31,373 ) (43,801 ) (36,174 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,678,856 10,426,304 10,571,706 10,383,179 Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share 332 297 — — Additional common stock equivalents (stock options) used to calculate diluted earnings per share 63,820 126,538 68,519 125,297 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,743,008 10,553,139 10,640,225 10,508,476

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Jun. 30, 2017
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, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 120,165 $ 142 $ (1,413 ) $ 118,894 Freddie Mac 96,592 138 (938 ) 95,792 Governmental National Mortgage Association 13,433 30 (189 ) 13,274 Total mortgage-backed securities 230,190 310 (2,540 ) 227,960 Obligations of states and political subdivisions 67,990 1,570 (581 ) 68,979 U.S. government agency securities 20,918 77 (6 ) 20,989 Corporate obligations 45,167 221 (634 ) 44,754 Other debt securities 25,250 57 (406 ) 24,901 Total debt securities 389,515 2,235 (4,167 ) 387,583 Equity securities - financial services 25 — — 25 Total $ 389,540 $ 2,235 $ (4,167 ) $ 387,608 September 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 115,535 $ 1,891 $ (173 ) $ 117,253 Freddie Mac 84,486 1,369 (85 ) 85,770 Governmental National Mortgage Association 16,091 76 (28 ) 16,139 Total mortgage-backed securities 216,112 3,336 (286 ) 219,162 Obligations of states and political subdivisions 71,323 2,432 (65 ) 73,690 U.S. government agency securities 25,669 272 — 25,941 Corporate obligations 38,331 599 (512 ) 38,418 Other debt securities 32,962 428 (216 ) 33,174 Total debt securities 384,397 7,067 (1,079 ) 390,385 Equity securities - financial services 25 — — 25 Total $ 384,422 $ 7,067 $ (1,079 ) $ 390,410
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, 2017, 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 $ 16,479 $ 16,482 Due after one year through five years 34,410 34,501 Due after five years through ten years 87,054 87,206 Due after ten years 251,572 249,394 Total $ 389,515 $ 387,583
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 (dollars in thousands): June 30, 2017 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 59 $ 75,369 $ (984 ) $ 12,175 $ (429 ) $ 87,544 $ (1,413 ) Freddie Mac 42 53,831 (664 ) 8,775 (274 ) 62,606 (938 ) Governmental National Mortgage Association 9 6,169 (156 ) 3,079 (33 ) 9,248 (189 ) Obligations of states and political subdivisions 24 26,357 (518 ) 1,506 (63 ) 27,863 (581 ) U.S. government agency securities 4 10,992 (6 ) — — 10,992 (6 ) Corporate obligations 24 19,688 (381 ) 6,227 (253 ) 25,915 (634 ) Other debt securities 19 12,782 (287 ) 8,637 (119 ) 21,419 (406 ) Total 181 $ 205,188 $ (2,996 ) $ 40,399 $ (1,171 ) $ 245,587 $ (4,167 ) September 30, 2016 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 17 $ 6,841 $ (21 ) $ 12,261 $ (152 ) $ 19,102 $ (173 ) Freddie Mac 11 7,457 (11 ) 6,375 (74 ) 13,832 (85 ) Governmental National Mortgage Association 5 4,704 (16 ) 1,267 (12 ) 5,971 (28 ) Obligations of states and political subdivisions 12 14,420 (65 ) — — 14,420 (65 ) Corporate obligations 12 8,778 (172 ) 5,303 (340 ) 14,081 (512 ) Other debt securities 13 6,582 (126 ) 6,914 (90 ) 13,496 (216 ) Total 70 $ 48,782 $ (411 ) $ 32,120 $ (668 ) $ 80,902 $ (1,079 )

Loans Receivable, Net and All25

Loans Receivable, Net and Allowance for Loan Losses (Tables)	9 Months Ended
	Jun. 30, 2017
Summary of Loans Receivable	Loans receivable consist of the following (in thousands): June 30, 2017 September 30, 2016 Real estate loans: Residential $ 586,871 $ 596,645 Construction 4,404 1,733 Commercial 308,679 288,447 Commercial 40,713 39,978 Obligations of states and political subdivisions 58,264 56,923 Home equity loans and lines of credit 46,704 48,163 Auto Loans 184,688 193,078 Other 3,104 3,302 1,233,427 1,228,269 Less allowance for loan losses 9,221 9,056 Net loans $ 1,224,206 $ 1,219,213
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, 2017 With no specific allowance recorded: Real estate loans Residential $ 4,796 $ 6,344 $ — Construction — — — Commercial 6,963 9,650 — Commercial 1,501 1,673 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 212 290 — Auto loans 434 443 — Other 23 29 — Total 13,929 18,429 — With an allowance recorded: Real estate loans Residential 1,887 2,179 197 Construction — — — Commercial 670 688 147 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 4 4 4 Auto loans 89 218 179 Other — — — Total 2,650 3,089 527 Total: Real estate loans Residential 6,683 8,523 197 Construction — — — Commercial 7,633 10,338 147 Commercial 1,501 1,673 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 216 294 4 Auto loans 523 661 179 Other 23 29 — Total Impaired Loans $ 16,579 $ 21,518 $ 527 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2016 With no specific allowance recorded: Real Estate Loans Residential $ 6,721 $ 9,016 $ — Construction — — — Commercial 10,939 12,928 — Commercial 1,698 1,725 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 361 432 — Auto Loans 253 365 — Other 22 22 — Total 19,994 24,488 — With an allowance recorded: Real Estate Loans Residential 2,000 2,151 198 Construction — — — Commercial 298 303 36 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 273 273 113 Other — — — Total 2,571 2,727 347 Total: Real Estate Loans Residential 8,721 11,167 198 Construction — — — Commercial 11,237 13,231 36 Commercial 1,698 1,725 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 361 432 — Auto Loans 526 638 113 Other 22 22 — Total Impaired Loans $ 22,565 $ 27,215 $ 347 The following tables represent 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, 2017 2016 2017 2016 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 4,800 $ 7,365 $ 9 $ 17 Construction — — — — Commercial 8,502 11,590 61 117 Commercial 1,584 1,839 30 37 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 208 502 — — Auto loans 144 241 — — Other 8 13 — — Total 15,246 21,550 100 171 With an allowance recorded: Real estate loans Residential 1,384 2,214 — 3 Construction — — — — Commercial 302 1,565 — — Commercial — — — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 4 98 — — Auto loans 298 291 1 5 Other — — — — Total 1,988 4,168 1 8 Total: Real estate loans Residential 6,184 9,579 9 20 Construction — — — — Commercial 8,804 13,155 61 117 Commercial 1,584 1,839 30 37 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 212 600 — — Auto loans 442 532 1 5 Other 8 13 — — Total Impaired Loans $ 17,234 $ 25,718 $ 101 $ 179 For the Nine Months Ended June 30, 2017 2016 2017 2016 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 5,633 $ 7,815 $ 30 $ 65 Construction — — — — Commercial 9,428 12,469 233 424 Commercial 1,638 1,513 92 89 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 243 615 — 2 Auto loans 127 250 — 2 Other 8 5 — — Total 17,077 22,667 355 582 With an allowance recorded: Real estate loans Residential 1,811 2,495 — 12 Construction — — — — Commercial 330 1,171 — — Commercial 40 3 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 4 77 — — Auto loans 268 217 7 8 Other — — — — Total 2,453 3,963 7 20 Total: Real estate loans Residential 7,444 10,310 30 77 Construction — — — — Commercial 9,758 13,640 233 424 Commercial 1,678 1,516 92 89 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 247 692 — 2 Auto loans 395 467 7 10 Other 8 5 — — Total Impaired Loans $ 19,530 $ 26,630 $ 362 $ 602
Changes in Accretable Yield for Purchased Credit-Impaired Loans	Changes in the accretable yield for purchased credit-impaired loans were as follows, since acquisition, for the three and nine month periods ended June 30, 2017 and June 30, 2016 (in thousands): For the Three Months Ended June 30, 2017 2016 Balance at beginning of period $ 460 $ 365 Reclassification, new additions and other 33 153 Accretion (32 ) (66 ) Balance at end of period $ 461 $ 452 For the Nine Months Ended June 30, 2017 2016 Balance at beginning of period $ 478 $ 258 Reclassification, new additions and other 151 240 Accretion (168 ) (46 ) Balance at end of period $ 461 $ 452
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, 2017 September 30, 2016 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 $ 6,083 $ 6,893 Carrying amount $ 4,911 $ 5,563
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, 2017 Real estate loans: Residential $ 586,871 $ 6,683 $ — $ 580,188 Construction 4,404 — — 4,404 Commercial 308,679 7,633 4,264 296,782 Commercial 40,713 1,501 318 38,894 Obligations of states and political subdivisions 58,264 — — 58,264 Home equity loans and lines of credit 46,704 216 329 46,159 Auto loans 184,688 523 — 184,165 Other 3,104 23 — 3,081 Total $ 1,233,427 $ 16,579 $ 4,911 $ 1,211,937 Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment September 30, 2016 Real estate loans: Residential $ 596,645 $ 8,721 $ — $ 587,924 Construction 1,733 — — 1,733 Commercial 288,447 11,237 4,615 272,595 Commercial 39,978 1,698 411 37,869 Obligations of states and political sub divisions 56,923 — — 56,923 Home equity loans and lines of credit 48,163 361 537 47,265 Auto loans 193,078 526 — 192,552 Other 3,302 22 — 3,280 Total $ 1,228,269 $ 22,565 $ 5,563 $ 1,200,141
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, 2017 and September 30, 2016 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2017 Commercial real estate loans $ 290,187 $ 4,479 $ 14,013 $ — $ 308,679 Commercial 37,598 164 2,951 — 40,713 Obligations of states and political subdivisions 58,264 — — — 58,264 Total $ 386,049 $ 4,643 $ 16,964 $ — $ 407,656 Pass Special Mention Substandard Doubtful or Loss Total September 30, 2016 Commercial real estate loans $ 260,088 $ 8,886 $ 19,473 $ — $ 288,447 Commercial 36,684 180 3,114 — 39,978 Obligations of states and political subdivisions 56,923 — — — 56,923 Total $ 353,695 $ 9,066 $ 22,587 $ — $ 385,348
Schedule of Performing or non-performing Loans	The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2017 and September 30, 2016 (in thousands): Performing Non- performing Purchased Credit Impaired Total June 30, 2017 Real estate loans: Residential $ 579,567 $ 7,304 $ — $ 586,871 Construction 4,404 — — 4,404 Home equity loans and lines of credit 46,101 274 329 46,704 Auto loans 184,020 668 — 184,688 Other 3,064 40 — 3,104 Total $ 817,156 $ 8,286 $ 329 $ 825,771 Performing Non-performing Purchased Impaired Credit Total September 30, 2016 Real estate loans: Residential $ 587,673 $ 8,972 $ — $ 596,645 Construction 1,733 — — 1,733 Home equity loans and lines of credit 47,213 413 537 48,163 Auto loans 192,734 344 — 193,078 Other 3,271 31 — 3,302 Total $ 832,624 $ 9,760 $ 537 $ 842,921
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, 2017 and September 30, 2016 (in thousands): Current 31-60 Days Past Due 61-90 Days Past Due Greater than 90 Days Past Due and still accruing Non-Accrual Total Past Due and Non- Accrual Purchased Credit Impaired Total Loans June 30, 2017 Real estate loans Residential $ 576,780 $ 2,091 $ 696 $ — $ 7,304 $ 10,091 $ — $ 586,871 Construction 4,404 — — — — — — 4,404 Commercial 300,069 157 — — 4,189 4,346 4,264 308,679 Commercial 39,820 19 — — 556 575 318 40,713 Obligations of states and political subdivisions 58,264 — — — — — — 58,264 Home equity loans and lines of credit 45,812 289 — — 274 563 329 46,704 Auto loans 183,290 700 30 — 668 1,398 — 184,688 Other 2,780 284 — — 40 324 — 3,104 Total $ 1,211,219 $ 3,540 $ 726 $ — $ 13,031 $ 17,297 $ 4,911 $ 1,233,427 Current 31-60 Days Past Due 61-90 Days Past Due Greater than 90 Days Past Due and still accruing Non-Accrual Total Past Due and Non- Accrual Purchased Credit Impaired Total Loans September 30, 2016 Real estate loans Residential $ 585,517 $ 1,496 $ 660 $ — $ 8,972 $ 11,128 $ — $ 596,645 Construction 1,733 — — — — — — 1,733 Commercial 279,019 1,093 191 — 3,529 4,813 4,615 288,447 Commercial 38,862 185 57 — 463 705 411 39,978 Obligations of states and political subdivisions 56,923 — — — — — — 56,923 Home equity loans and lines of credit 47,026 40 147 — 413 600 537 48,163 Auto loans 191,785 717 232 — 344 1,293 — 193,078 Other 3,264 7 — — 31 38 — 3,302 Total $ 1,204,129 $ 3,538 $ 1,287 $ — $ 13,752 $ 18,577 $ 5,563 $ 1,228,269
Summary of Primary Segments of ALL	The following table summarizes changes in the primary segments of the ALL for the three and nine month periods ending June 30, 2017 and 2016 (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, 2017 $ 4,130 $ 30 $ 1,038 $ 951 $ 244 $ 445 $ 1,908 $ 24 $ 596 $ 9,366 Charge-offs (23 ) — (649 ) — — — (460 ) — — (1,132 ) Recoveries 11 — 9 1 — 2 213 1 — 237 Provision 88 3 968 34 2 47 205 (2 ) (595 ) 750 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at March 31, 2016 $ 4,655 $ 24 $ 968 $ 738 $ 196 $ 389 $ 1,925 $ 25 $ 495 $ 9,415 Charge-offs (259 ) — (61 ) (5 ) — (11 ) (369 ) — — (705 ) Recoveries 34 — — 5 — 2 37 2 — 80 Provision 57 2 (2 ) 96 5 29 494 (2 ) (79 ) 600 ALL balance at June 30, 2016 $ 4,487 $ 26 $ 905 $ 834 $ 201 $ 409 $ 2,087 $ 25 $ 416 $ 9,390 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (390 ) — (867 ) (20 ) — (6 ) (1,521 ) (4 ) — (2,808 ) Recoveries 18 — 19 1 — 5 673 7 — 723 Provision 152 20 1,362 123 31 40 834 (5 ) (307 ) 2,250 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 Charge-offs (657 ) — (70 ) (8 ) — (110 ) (746 ) — — (1,591 ) Recoveries 37 — 52 7 — 6 154 6 — 262 Provision (33 ) 19 252 142 12 52 1,109 (8 ) 255 1,800 ALL balance at June 30, 2016 $ 4,487 $ 26 $ 905 $ 834 $ 201 $ 409 $ 2,087 $ 25 $ 416 $ 9,390 The Company allocated increased provisions to commercial real estate loans for the three month period ending June 30, 2017 due to increased charge off activity and increased loan balances. Charge offs increased for the quarter ended June 30, 2017 due primarily to the charge off of $414,000 on one commercial real estate loan. The Company allocated increased provisions in auto loans due to increased charge off activity and increased non-performing loans. Acquired loans are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. 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, 2017 and September 30, 2016 (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 $ 197 $ — $ 147 $ — $ — $ 4 $ 179 $ — $ — $ 527 Collectively evaluated for impairment 4,009 33 1,219 986 246 490 1,687 23 1 8,694 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 Individually evaluated for impairment $ 198 $ — $ 36 $ — $ — $ — $ 113 $ — $ — $ 347 Collectively evaluated for impairment 4,228 13 816 882 215 455 1,767 25 308 8,709 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056
Summary of Troubled Debt Restructuring Granted	The following is a summary of troubled debt restructuring granted during the three months ended June 30, 2017 and 2016 (dollars in thousands): For the Three Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 529 $ 529 Construction — — — Commercial — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other — — — Total 3 $ 542 $ 542 For the Three Months Ended June 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 3 $ 248 $ 248 Construction — — — Commercial 1 1,612 1,612 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 1 7 7 Auto loans — — — Other — — — Total 5 $ 1,867 $ 1,867 Of the three new troubled debt restructurings granted for the three months ended June 30, 2017, two loans for $206,000 were granted terms and rate concessions and one loan for $336,000 was granted interest rate concessions. Of the five new troubled debt restructurings granted for the three months ended June 30, 2016, two loans totaling $118,000, were granted term and rate concessions, two loan totaling $1.7 million were granted term concessions and one loan totaling $7,000 was granted a rate concession. The following is a summary of troubled debt restructuring granted during the nine months ended June 30, 2017 and 2016 (dollars in thousands): For the Nine Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 5 $ 902 $ 902 Construction — — — Commercial 1 93 93 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other 1 21 21 Total 8 $ 1,029 $ 1,029 For the Nine Months Ended June 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 7 $ 916 $ 916 Construction — — — Commercial 2 1,689 1,689 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 1 7 7 Auto loans — — — Other — — — Total 10 $ 2,612 $ 2,612
Eagle National Bancorp, Inc [Member]
Schedule of Investment and Unpaid Principal Balances for Impaired Loans	The carrying value of the loans acquired and accounted for in accordance with ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality Unpaid principal balance $ 3,468 Interest 717 Contractual cash flows 4,185 Non-accretable discount (1,973 ) Expected cash flows 2,212 Accretable discount (240 ) Estimated fair value $ 1,972

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Jun. 30, 2017
Banking And Thrift [Abstract]
Schedule of Deposits by Major Classifications	Deposits consist of the following major classifications (in thousands): June 30, 2017 September 30, 2016 Non-interest bearing demand accounts $ 154,705 $ 142,924 Interest bearing demand accounts 156,395 167,259 Money market accounts 244,650 249,947 Savings and club accounts 147,260 142,021 Certificates of deposit 513,452 512,669 Total $ 1,216,462 $ 1,214,820

Net Periodic Benefit Cost-Def27

Net Periodic Benefit Cost-Defined Benefit Plan (Tables)	9 Months Ended
	Jun. 30, 2017
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, 2017 and 2016 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2017 2016 2017 2016 Service Cost $ 69 $ 249 $ 447 $ 747 Interest Cost 208 246 651 736 Expected return on plan assets (348 ) (311 ) (1,037 ) (933 ) Amortization of unrecognized loss 23 119 182 358 Net periodic benefit cost $ (48 ) $ 303 $ 243 $ 908

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	9 Months Ended
	Jun. 30, 2017
Postemployment Benefits [Abstract]
Schedule of Stock Option Activity	The following is a summary of the Company’s stock option activity and related information for its option grants for the nine month period ended June 30, 2017. Number of Stock Options Weighted- average Exercise Price Weighted- average Remaining Contractual Term (in Aggregate Intrinsic Value (in thousands) Outstanding at September 30, 2016 905,987 $ 12.35 1.67 $ 1,341 Granted — — — — Exercised 544,341 12.35 0.92 — Forfeited — — — — Outstanding June 30, 2017 361,646 $ 12.35 0.92 $ 857 Exercisable at June 30, 2017 361,646 $ 12.35 0.92 $ 857
Schedule of Restricted Stock Option Activity	The following is a summary of the status of the Company’s restricted stock as of June 30, 2017, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2016 31,896 $ 13.01 Granted 23,971 16.28 Vested — — Forfeited — — Nonvested at June 30, 2017 55,867 $ 14.50

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Securities, Derivatives, Other Real Estate Owned and Impaired Loans Measured at Fair Value	The following tables present information about the Company’s securities, derivatives, other real estate owned, impaired loans and mortgage servicing rights measured at fair value as of June 30, 2017 and September 30, 2016 and indicates the fair value hierarchy of the valuation techniques utilized by the Bank to determine such fair value: Fair Value Measurement at June 30, 2017 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of June 30, 2017 Securities available-for-sale measured on a recurring basis Mortgage backed securities $ — $ 227,960 $ — $ 227,960 Obligations of states and political subdivisions — 68,979 — 68,979 U.S. government agencies — 20,989 — 20,989 Corporate obligations — 36,040 8,714 44,754 Other debt securities — 24,901 — 24,901 Equity securities-financial services 25 — — 25 Total debt and equity securities $ 25 $ 378,869 $ 8,714 $ 387,608 Derivatives $ — $ 1,169 $ — $ 1,169 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 2,859 $ 2,859 Impaired loans $ — $ — $ 16,052 $ 16,052 Mortgage servicing rights $ — $ — $ 284 $ 284 Fair Value Measurement at September 30, 2016 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of September 30, 2016 Securities available-for-sale measured on a recurring basis Mortgage backed securities $ — $ 219,162 $ — $ 219,162 Obligations of states and political subdivisions — 73,690 — 73,690 U.S. government agencies — 25,941 — 25,941 Corporate obligations — 31,433 6,985 38,418 Other debt securities — 32,674 500 33,174 Equity securities-financial services 25 — — 25 Total debt and equity securities $ 25 $ 382,900 $ 7,485 $ 390,410 Derivatives $ — $ 453 $ — $ 453 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 2,659 $ 2,659 Impaired loans $ — $ — $ 22,218 $ 22,218 Mortgage Servicing rights $ — $ — $ 398 $ 398
Schedule of Changes in Fair Value of Level III Investments	The following tables present 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, 2017 and 2016 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2017 June 30, 2016 Beginning balance $ 8,735 $ 7,136 Purchases, sales, issuances, settlements, net — 3,000 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (21 ) 76 Transfers in and/or out of Level III — — $ 8,714 $ 10,212 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2017 June 30, 2016 Beginning balance $ 7,485 $ 4,211 Purchases, sales, issuances, settlements, net 756 6,000 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income 473 1 Transfers in and/or out of Level III — — $ 8,714 $ 10,212
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 (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2017 Impaired loans $ 16,052 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 57% (24.1%) Foreclosed real estate owned 2,859 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 50% (21.9%) Mortgage servicing rights 284 Discounted cash flow Discount rate 11% to 16% (11.6%) Prepayment speeds 10% to 30% (15.7%) Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range September 30, 2016: Impaired loans $ 22,218 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 50% (23.0%) Foreclosed real estate owned 2,659 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 50% (22.1%) Mortgage servicing rights 398 Discounted cash flow Discount rate 12% (12.0%) Prepayment speeds 8% to 33% (17.2%) (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 Estimate of Fair Value Using Methodologies	The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below (in thousands). June 30, 2017 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 33,559 $ 33,559 $ — $ — $ 33,559 Certificates of deposit 1,000 — — 1,006 1,006 Investment and mortgage backed securities available for sale 387,608 25 378,869 8,714 387,608 Loans receivable, net 1,224,206 — — 1,221,711 1,221,711 Accrued interest receivable 5,839 5,839 — — 5,839 Regulatory stock 15,120 15,120 — — 15,120 Mortgage servicing rights 284 — — 284 284 Derivatives 1,169 — 1,169 — 1,169 Bank owned life insurance 37,368 37,368 — — 37,368 Financial liabilities: Deposits $ 1,216,462 $ 703,010 $ — $ 514,284 $ 1,217,294 Short-term borrowings 145,665 145,665 — 145,665 Other borrowings 198,168 — — 198,203 198,203 Advances by borrowers for taxes and insurance 12,213 12,213 — — 12,213 Accrued interest payable 1,189 1,189 — — 1,189 September 30, 2016 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 43,658 $ 43,658 $ — $ — $ 43,658 Certificates of deposit 1,250 — — 1,269 1,269 Investment and mortgage backed securities available for sale 390,410 25 382,900 7,485 390,410 Loans receivable, net 1,219,213 — — 1,237,759 1,237,759 Accrued interest receivable 5,769 5,769 — — 5,769 Regulatory stock 15,463 15,463 — — 15,463 Mortgage servicing rights 398 — — 398 398 Derivatives 453 — 453 — 453 Bank owned life insurance 36,593 36,593 — — 36,593 Financial liabilities: Deposits $ 1,214,820 $ 702,151 $ — $ 516,743 $ 1,218,894 Short-term borrowings 129,460 129,460 — — 129,460 Other borrowings 230,601 — — 231,911 231,911 Advances by borrowers for taxes and insurance 4,956 4,956 — — 4,956 Accrued interest payable 1,046 1,046 — — 1,046

Accumulated Other Comprehensi30

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Summary of Activity in Accumulated Other Comprehensive Income (Loss)	The activity in accumulated other comprehensive loss for the three and nine month periods ended June 30, 2017 and 2016 is as follows (in thousands): Accumulated Other Comprehensive Loss Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2017 $ (1,266 ) $ (2,020 ) $ 922 $ (2,364 ) Other comprehensive income (loss) before reclassifications — 940 (153 ) 787 Amounts reclassified from accumulated other comprehensive loss, net of tax 12 (195 ) 2 (181 ) Period change 12 745 (151 ) 606 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Balance at March 31, 2016 $ (5,167 ) $ 3,730 $ — $ (1,437 ) Other comprehensive income before reclassifications — 1,558 — 1,558 Amounts reclassified from accumulated other comprehensive loss, net of tax 78 (272 ) — (194 ) Period change 78 1,286 — 1,364 Balance at June 30, 2016 $ (5,089 ) $ 5,016 $ — $ (73 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Other comprehensive income (loss) before reclassifications 4,714 (5,032 ) 474 156 Amounts reclassified from accumulated other comprehensive loss, net of tax 115 (195 ) (2 ) (82 ) Period change 4,829 (5,227 ) 472 74 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ — $ (2,395 ) Other comprehensive income before reclassifications — 2,601 — 2,601 Amounts reclassified from accumulated other comprehensive loss, net of tax 236 (515 ) — (279 ) Period change 236 2,086 — 2,322 Balance at June 30, 2016 $ (5,089 ) $ 5,016 $ — $ (73 )
Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss)	The following tables present significant amounts reclassified out of each component of accumulated other comprehensive loss for the three and nine month periods ended June 30, 2017 and 2016 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2017 2016 Securities available for sale: Securities gains reclassified into earnings $ 295 $ 413 Gain on sale of investments Related income tax expense (100 ) (141 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 272 Defined benefit pension plan: Amortization of net loss (23 ) (119 ) Compensation and employee Related income tax expense 11 41 Income taxes Net effect on accumulated other comprehensive loss for the period (12 ) (78 ) Derivatives and hedging activities: Interest expense, effective portion (3 ) — Interest expense Related income tax expense 1 — Income taxes Net effect on accumulated other comprehesive loss for the period (2 ) — Total reclassification for the period $ 181 $ 194 Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2017 2016 Securities available for sale: Securities gains reclassified into earnings $ 295 $ 781 Gain on sale of investments Related income tax expense (100 ) (266 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 515 Defined benefit pension plan: Amortization of net loss (182 ) (358 ) Compensation and employee benefits Related income tax expense 67 122 Income taxes Net effect on accumulated other comprehensive loss for the period (115 ) (236 ) Derivative and hedging activities: Interest expense, effective portion 3 — Interest expense Related income tax expense (1 ) — Income taxes Net effect on accumulated other comprehensive loss for the period 2 — Total reclassification for the period $ 82 $ 279

Derivatives and Hedging Activit

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Jun. 30, 2017
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, 2017 and September 30, 2016 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2017 As of September 30, 2016 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest Rate Products Other Assets $ 1,169 Other Assets $ 453
Schedule of Pre-Tax Net Gains (Losses) of Cash flow Hedges	The tables below present the pre-tax net gains (losses) of the Company’s cash flow hedges for the three and nine month periods ended June 30, 2017 and 2016, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow 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) Gain Reclassified from Accumulated OCI into Income (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended June 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 153 $ — Interest expense $ 3 $ — Other non-interest income $ — $ — Ending balance of OCI Total $ 153 $ — $ 3 $ — $ — $ — Derivatives in Cash Flow Hedging Relationships Gain 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)Reclassified from Accumulated OCI into Income (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Nine Months Ended June 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 474 $ — Interest expense $ (3 ) $ — Other non-interest income $ — $ — Ending balance of OCI Total $ 474 $ — $ (3 ) $ — $ — $ —

Nature of Operations and Basi32

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Jun. 30, 2017
ESSA Bank & Trust [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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
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	(6,547,695)	(6,753,180)	(6,629,264)	(6,780,144)
Average unearned ESOP shares	(876,964)	(922,238)	(888,324)	(933,598)
Average unearned non-vested shares	(29,580)	(31,373)	(43,801)	(36,174)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	10,678,856	10,426,304	10,571,706	10,383,179
Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share	332	297
Additional common stock equivalents (stock options) used to calculate diluted earnings per share	63,820	126,538	68,519	125,297
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	10,743,008	10,553,139	10,640,225	10,508,476

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - Stock Option [Member] - $ / shares	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	50,310	43,692
Average weighted price per share of anti-dilutive shares	$ 14.38	$ 12.93

Recent Accounting Pronounceme35

Recent Accounting Pronouncements - Additional Information (Detail) - ASU 2016-02, Leases [Member] - Maximum [Member]	9 Months Ended
	Jun. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Estimated percentage increase in assets from recognition of leases	1.00%
Estimated percentage increase in liabilities from recognition of leases	1.00%

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, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 389,540	$ 384,422
Available for sale, Gross Unrealized Gains	2,235	7,067
Available for sale, Gross Unrealized Losses	(4,167)	(1,079)
Available for sale, Fair Value	387,608	390,410
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	120,165	115,535
Available for sale, Gross Unrealized Gains	142	1,891
Available for sale, Gross Unrealized Losses	(1,413)	(173)
Available for sale, Fair Value	118,894	117,253
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	96,592	84,486
Available for sale, Gross Unrealized Gains	138	1,369
Available for sale, Gross Unrealized Losses	(938)	(85)
Available for sale, Fair Value	95,792	85,770
Governmental National Mortgage Association [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	13,433	16,091
Available for sale, Gross Unrealized Gains	30	76
Available for sale, Gross Unrealized Losses	(189)	(28)
Available for sale, Fair Value	13,274	16,139
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	230,190	216,112
Available for sale, Gross Unrealized Gains	310	3,336
Available for sale, Gross Unrealized Losses	(2,540)	(286)
Available for sale, Fair Value	227,960	219,162
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	67,990	71,323
Available for sale, Gross Unrealized Gains	1,570	2,432
Available for sale, Gross Unrealized Losses	(581)	(65)
Available for sale, Fair Value	68,979	73,690
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	20,918	25,669
Available for sale, Gross Unrealized Gains	77	272
Available for sale, Gross Unrealized Losses	(6)
Available for sale, Fair Value	20,989	25,941
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	45,167	38,331
Available for sale, Gross Unrealized Gains	221	599
Available for sale, Gross Unrealized Losses	(634)	(512)
Available for sale, Fair Value	44,754	38,418
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	25,250	32,962
Available for sale, Gross Unrealized Gains	57	428
Available for sale, Gross Unrealized Losses	(406)	(216)
Available for sale, Fair Value	24,901	33,174
Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	389,515	384,397
Available for sale, Gross Unrealized Gains	2,235	7,067
Available for sale, Gross Unrealized Losses	(4,167)	(1,079)
Available for sale, Fair Value	387,583	390,385
Equity Securities-Financial Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	25	25
Available for sale, Fair Value	$ 25	$ 25

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	$ 16,479
Due after one year through five years, Amortized Cost	34,410
Due after five years through ten years, Amortized Cost	87,054
Due after ten years, Amortized Cost	251,572
Total, Amortized Cost	389,515
Due in one year or less, Fair Value	16,482
Due after one year through five years, Fair Value	34,501
Due after five years through ten years, Fair Value	87,206
Due after ten years, Fair Value	249,394
Total, Fair Value	$ 387,583

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Realized gross gains	$ 299,000		$ 413,000	$ 299,000	$ 781,000
Realized gross losses	4,000		0	4,000
Proceeds from the sale of investment securities	$ 17,400,000		$ 16,700,000	$ 17,400,000	$ 45,700,000
Eagle National Bancorp, Inc [Member]
Schedule of Available-for-sale Securities [Line Items]
Realized gross gains		$ 0
Realized gross losses		0
Proceeds from the sale of investment securities		$ 16,200,000

Investment Securities - Sched39

Investment Securities - Schedule of Gross Unrealized Losses and Fair Value (Detail) $ in Thousands	Jun. 30, 2017USD ($)Security	Sep. 30, 2016USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	181	70
Fair Value, Less than Twelve Months	$ 205,188	$ 48,782
Gross Unrealized Losses, Less than Twelve Months	(2,996)	(411)
Fair Value, Twelve Months or Greater	40,399	32,120
Gross Unrealized Losses, Twelve Months or Greater	(1,171)	(668)
Fair Value, Total	245,587	80,902
Gross Unrealized Losses, Total	$ (4,167)	$ (1,079)
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	59	17
Fair Value, Less than Twelve Months	$ 75,369	$ 6,841
Gross Unrealized Losses, Less than Twelve Months	(984)	(21)
Fair Value, Twelve Months or Greater	12,175	12,261
Gross Unrealized Losses, Twelve Months or Greater	(429)	(152)
Fair Value, Total	87,544	19,102
Gross Unrealized Losses, Total	$ (1,413)	$ (173)
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	42	11
Fair Value, Less than Twelve Months	$ 53,831	$ 7,457
Gross Unrealized Losses, Less than Twelve Months	(664)	(11)
Fair Value, Twelve Months or Greater	8,775	6,375
Gross Unrealized Losses, Twelve Months or Greater	(274)	(74)
Fair Value, Total	62,606	13,832
Gross Unrealized Losses, Total	$ (938)	$ (85)
Governmental National Mortgage Association [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	9	5
Fair Value, Less than Twelve Months	$ 6,169	$ 4,704
Gross Unrealized Losses, Less than Twelve Months	(156)	(16)
Fair Value, Twelve Months or Greater	3,079	1,267
Gross Unrealized Losses, Twelve Months or Greater	(33)	(12)
Fair Value, Total	9,248	5,971
Gross Unrealized Losses, Total	$ (189)	$ (28)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	24	12
Fair Value, Less than Twelve Months	$ 26,357	$ 14,420
Gross Unrealized Losses, Less than Twelve Months	(518)	(65)
Fair Value, Twelve Months or Greater	1,506
Gross Unrealized Losses, Twelve Months or Greater	(63)
Fair Value, Total	27,863	14,420
Gross Unrealized Losses, Total	$ (581)	$ (65)
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	4
Fair Value, Less than Twelve Months	$ 10,992
Gross Unrealized Losses, Less than Twelve Months	(6)
Fair Value, Total	10,992
Gross Unrealized Losses, Total	$ (6)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	24	12
Fair Value, Less than Twelve Months	$ 19,688	$ 8,778
Gross Unrealized Losses, Less than Twelve Months	(381)	(172)
Fair Value, Twelve Months or Greater	6,227	5,303
Gross Unrealized Losses, Twelve Months or Greater	(253)	(340)
Fair Value, Total	25,915	14,081
Gross Unrealized Losses, Total	$ (634)	$ (512)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	19	13
Fair Value, Less than Twelve Months	$ 12,782	$ 6,582
Gross Unrealized Losses, Less than Twelve Months	(287)	(126)
Fair Value, Twelve Months or Greater	8,637	6,914
Gross Unrealized Losses, Twelve Months or Greater	(119)	(90)
Fair Value, Total	21,419	13,496
Gross Unrealized Losses, Total	$ (406)	$ (216)

Loans Receivable, Net and All40

Loans Receivable, Net and Allowance for Loan Losses - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015
Real estate loans:
Total Loans	$ 1,233,427		$ 1,228,269
Less allowance for loan losses	9,221	$ 9,366	9,056	$ 9,390	$ 9,415	$ 8,919
Net loans	1,224,206		1,219,213
Residential Real Estate Loans [Member]
Real estate loans:
Total Loans	586,871		596,645
Less allowance for loan losses	4,206	4,130	4,426	4,487	4,655	5,140
Construction Real Estate Loans [Member]
Real estate loans:
Total Loans	4,404		1,733
Commercial Real Estate Loans [Member]
Real estate loans:
Total Loans	308,679		288,447
Less allowance for loan losses	1,366	1,038	852	905	968	671
Commercial Loans [Member]
Real estate loans:
Total Loans	40,713		39,978
Less allowance for loan losses	986	951	882	834	738	693
Obligations of States and Political Subdivisions [Member]
Real estate loans:
Total Loans	58,264		56,923
Less allowance for loan losses	246	244	215	201	196	189
Home Equity Loans and Lines of Credit [Member]
Real estate loans:
Total Loans	46,704		48,163
Less allowance for loan losses	494	445	455	409	389	461
Auto Loans [Member]
Real estate loans:
Total Loans	184,688		193,078
Less allowance for loan losses	1,866	1,908	1,880	2,087	1,925	1,570
Other [Member]
Real estate loans:
Total Loans	3,104		3,302
Less allowance for loan losses	$ 23	$ 24	$ 25	$ 25	$ 25	$ 27

Loans Receivable, Net and All41

Loans Receivable, Net and Allowance for Loan Losses - Additional Information (Detail)	Dec. 04, 2015USD ($)	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Sep. 30, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 3,468,000	$ 21,518,000		$ 21,518,000		$ 27,215,000
Estimated fair value	1,972,000
Contractual cash flows	4,185,000
Preliminary estimate of expected cash flows	2,212,000
Non-accretable discount	1,973,000
Cash flows in excess of estimated fair value	$ 240,000
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
Charge-offs		$ 1,132,000	$ 705,000	$ 2,808,000	$ 1,591,000
Number of Contracts | Contract		3	5	8	10
Number of troubled debt restructuring loans granted terms and rate concessions | Contract		2	2	5	4
Troubled debt restructurings granted terms and rate concession		$ 206,000	$ 118,000	$ 539,000	$ 690,000
Number of troubled debt restructuring loans granted interest rate concession | Contract		1	1	2	2
Troubled debt restructurings loans granted interest rate concession		$ 336,000	$ 7,000	$ 357,000	$ 84,000
Number of troubled debt restructuring loans granted terms concessions | Contract			2	1	4
Troubled debt restructurings granted terms concession			$ 1,700,000	$ 133,000	$ 1,800,000
Number of troubled debt restructurings, loan modified, defaulted within one year of modification | Contract		0	0	0	0
Foreclosed assets		$ 2,900,000		$ 2,900,000		$ 2,700,000
Consumer Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Foreclosed assets		1,900,000		1,900,000
Formal foreclosure proceeding assets		2,000,000		2,000,000
One Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs		414,000,000
Eagle National Bancorp, Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance		3,500,000		3,500,000
Estimated fair value				2,000,000
Contractual cash flows		4,200,000		4,200,000
Preliminary estimate of expected cash flows		2,200,000		2,200,000
Non-accretable discount				2,000,000
Cash flows in excess of estimated fair value		240,000		240,000
Loans Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of Purchased loans		$ 4,900,000		$ 4,900,000

Loans Receivable, Net and All42

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Investment and Unpaid Principal Balances for Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 04, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment		$ 16,579		$ 16,579		$ 22,565
Unpaid Principal Balance	$ 3,468	21,518		21,518		27,215
Associated Allowance		527		527		347
Average Recorded Investment		17,234	$ 25,718	19,530	$ 26,630
Interest	717	101	179	362	602
Contractual cash flows	4,185
Non-accretable discount	(1,973)
Expected cash flows	2,212
Accretable discount	(240)
Estimated fair value	$ 1,972
With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		13,929		13,929		19,994
Unpaid Principal Balance		18,429		18,429		24,488
Average Recorded Investment		15,246	21,550	17,077	22,667
Interest		100	171	355	582
With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		2,650		2,650		2,571
Unpaid Principal Balance		3,089		3,089		2,727
Associated Allowance		527		527		347
Average Recorded Investment		1,988	4,168	2,453	3,963
Interest		1	8	7	20
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		6,683		6,683		8,721
Unpaid Principal Balance		8,523		8,523		11,167
Associated Allowance		197		197		198
Average Recorded Investment		6,184	9,579	7,444	10,310
Interest		9	20	30	77
Residential Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		4,796		4,796		6,721
Unpaid Principal Balance		6,344		6,344		9,016
Average Recorded Investment		4,800	7,365	5,633	7,815
Interest		9	17	30	65
Residential Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		1,887		1,887		2,000
Unpaid Principal Balance		2,179		2,179		2,151
Associated Allowance		197		197		198
Average Recorded Investment		1,384	2,214	1,811	2,495
Interest			3		12
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		7,633		7,633		11,237
Unpaid Principal Balance		10,338		10,338		13,231
Associated Allowance		147		147		36
Average Recorded Investment		8,804	13,155	9,758	13,640
Interest		61	117	233	424
Commercial Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		6,963		6,963		10,939
Unpaid Principal Balance		9,650		9,650		12,928
Average Recorded Investment		8,502	11,590	9,428	12,469
Interest		61	117	233	424
Commercial Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		670		670		298
Unpaid Principal Balance		688		688		303
Associated Allowance		147		147		36
Average Recorded Investment		302	1,565	330	1,171
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		1,501		1,501		1,698
Unpaid Principal Balance		1,673		1,673		1,725
Average Recorded Investment		1,584	1,839	1,678	1,516
Interest		30	37	92	89
Commercial Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		1,501		1,501		1,698
Unpaid Principal Balance		1,673		1,673		1,725
Average Recorded Investment		1,584	1,839	1,638	1,513
Interest		30	37	92	89
Commercial Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment				40	3
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		216		216		361
Unpaid Principal Balance		294		294		432
Associated Allowance		4		4
Average Recorded Investment		212	600	247	692
Interest					2
Home Equity Loans and Lines of Credit [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		212		212		361
Unpaid Principal Balance		290		290		432
Average Recorded Investment		208	502	243	615
Interest					2
Home Equity Loans and Lines of Credit [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		4		4
Unpaid Principal Balance		4		4
Associated Allowance		4		4
Average Recorded Investment		4	98	4	77
Auto Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		523		523		526
Unpaid Principal Balance		661		661		638
Associated Allowance		179		179		113
Average Recorded Investment		442	532	395	467
Interest		1	5	7	10
Auto Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		434		434		253
Unpaid Principal Balance		443		443		365
Average Recorded Investment		144	241	127	250
Interest					2
Auto Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		89		89		273
Unpaid Principal Balance		218		218		273
Associated Allowance		179		179		113
Average Recorded Investment		298	291	268	217
Interest		1	5	7	8
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		23		23		22
Unpaid Principal Balance		29		29		22
Average Recorded Investment		8	13	8	5
Other [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		23		23		22
Unpaid Principal Balance		29		29		$ 22
Average Recorded Investment		$ 8	$ 13	$ 8	$ 5

Loans Receivable, Net and All43

Loans Receivable, Net and Allowance for Loan Losses - Changes in Accretable Yield for Purchased Credit-Impaired Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Balance at beginning of period	$ 460	$ 365	$ 478	$ 258
Reclassification, new additions and other	33	153	151	240
Accretion	(32)	(66)	(168)	(46)
Balance at end of period	$ 461	$ 452	$ 461	$ 452

Loans Receivable, Net and All44

Loans Receivable, Net and Allowance for Loan Losses - Summary of Additional Information Regarding Loans Acquired and Accounted (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,233,427	$ 1,228,269
Loans Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	6,083	6,893
Carrying amount	$ 4,911	$ 5,563

Loans Receivable, Net and All45

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,233,427	$ 1,228,269
Individually Evaluated for Impairment	16,579	22,565
Collectively Evaluated for Impairment	1,211,937	1,200,141
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,911	5,563
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	586,871	596,645
Individually Evaluated for Impairment	6,683	8,721
Collectively Evaluated for Impairment	580,188	587,924
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	308,679	288,447
Individually Evaluated for Impairment	7,633	11,237
Collectively Evaluated for Impairment	296,782	272,595
Commercial Real Estate Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,264	4,615
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,404	1,733
Collectively Evaluated for Impairment	4,404	1,733
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	40,713	39,978
Individually Evaluated for Impairment	1,501	1,698
Collectively Evaluated for Impairment	38,894	37,869
Commercial Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	318	411
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	58,264	56,923
Collectively Evaluated for Impairment	58,264	56,923
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	46,704	48,163
Individually Evaluated for Impairment	216	361
Collectively Evaluated for Impairment	46,159	47,265
Home Equity Loans and Lines of Credit [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	329	537
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	184,688	193,078
Individually Evaluated for Impairment	523	526
Collectively Evaluated for Impairment	184,165	192,552
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,104	3,302
Individually Evaluated for Impairment	23	22
Collectively Evaluated for Impairment	$ 3,081	$ 3,280

Loans Receivable, Net and All46

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio, Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 1,224,206	$ 1,219,213
Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	407,656	385,348
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	308,679	288,447
Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	40,713	39,978
Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	58,264	56,923
Pass [Member] | Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	386,049	353,695
Pass [Member] | Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	290,187	260,088
Pass [Member] | Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	37,598	36,684
Pass [Member] | Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	58,264	56,923
Special Mention [Member] | Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	4,643	9,066
Special Mention [Member] | Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	4,479	8,886
Special Mention [Member] | Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	164	180
Substandard [Member] | Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	16,964	22,587
Substandard [Member] | Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	14,013	19,473
Substandard [Member] | Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 2,951	$ 3,114

Loans Receivable, Net and All47

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Performing or Non-Performing Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,224,206	$ 1,219,213
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	825,771	842,921
Purchase Credit Impaired [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	329	537
Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	817,156	832,624
Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,286	9,760
Residential Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	586,871	596,645
Residential Real Estate Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	579,567	587,673
Residential Real Estate Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,304	8,972
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,404	1,733
Commercial Real Estate Loans [Member] | Performing [Member] | Construction Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,404	1,733
Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	46,704	48,163
Home Equity Loans and Lines of Credit [Member] | Purchase Credit Impaired [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	329	537
Home Equity Loans and Lines of Credit [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	46,101	47,213
Home Equity Loans and Lines of Credit [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	274	413
Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	184,688	193,078
Auto Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	184,020	192,734
Auto Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	668	344
Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,104	3,302
Other [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,064	3,271
Other [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 40	$ 31

Loans Receivable, Net and All48

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio Summarized by Aging Categories (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,211,219	$ 1,204,129
31-60 Days Past Due	3,540	3,538
61-90 Days Past Due	726	1,287
Non-accrual	13,031	13,752
Total Past Due	17,297	18,577
Purchased Credit Impaired	4,911	5,563
Total Loans	1,233,427	1,228,269
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	576,780	585,517
31-60 Days Past Due	2,091	1,496
61-90 Days Past Due	696	660
Non-accrual	7,304	8,972
Total Past Due	10,091	11,128
Total Loans	586,871	596,645
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,404	1,733
Total Loans	4,404	1,733
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	300,069	279,019
31-60 Days Past Due	157	1,093
61-90 Days Past Due		191
Non-accrual	4,189	3,529
Total Past Due	4,346	4,813
Purchased Credit Impaired	4,264	4,615
Total Loans	308,679	288,447
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	39,820	38,862
31-60 Days Past Due	19	185
61-90 Days Past Due		57
Non-accrual	556	463
Total Past Due	575	705
Purchased Credit Impaired	318	411
Total Loans	40,713	39,978
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	58,264	56,923
Total Loans	58,264	56,923
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	45,812	47,026
31-60 Days Past Due	289	40
61-90 Days Past Due		147
Non-accrual	274	413
Total Past Due	563	600
Purchased Credit Impaired	329	537
Total Loans	46,704	48,163
Auto Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	183,290	191,785
31-60 Days Past Due	700	717
61-90 Days Past Due	30	232
Non-accrual	668	344
Total Past Due	1,398	1,293
Total Loans	184,688	193,078
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,780	3,264
31-60 Days Past Due	284	7
Non-accrual	40	31
Total Past Due	324	38
Total Loans	$ 3,104	$ 3,302

Loans Receivable, Net and All49

Loans Receivable, Net and Allowance for Loan Losses - Summary of Primary Segments of ALL (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	$ 9,366	$ 9,415	$ 9,056	$ 8,919
Charge-offs	(1,132)	(705)	(2,808)	(1,591)
Recoveries	237	80	723	262
Provision	750	600	2,250	1,800
Balance, End of period	9,221	9,390	9,221	9,390
Individually evaluated for impairment	527		527		$ 347
Collectively evaluated for impairment	8,694		8,694		8,709
Residential Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	4,130	4,655	4,426	5,140
Charge-offs	(23)	(259)	(390)	(657)
Recoveries	11	34	18	37
Provision	88	57	152	(33)
Balance, End of period	4,206	4,487	4,206	4,487
Individually evaluated for impairment	197		197		198
Collectively evaluated for impairment	4,009		4,009		4,228
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,038	968	852	671
Charge-offs	(649)	(61)	(867)	(70)
Recoveries	9		19	52
Provision	968	(2)	1,362	252
Balance, End of period	1,366	905	1,366	905
Individually evaluated for impairment	147		147		36
Collectively evaluated for impairment	1,219		1,219		816
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	30	24	13	7
Provision	3	2	20	19
Balance, End of period	33	26	33	26
Collectively evaluated for impairment	33		33		13
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	951	738	882	693
Charge-offs		(5)	(20)	(8)
Recoveries	1	5	1	7
Provision	34	96	123	142
Balance, End of period	986	834	986	834
Collectively evaluated for impairment	986		986		882
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	244	196	215	189
Provision	2	5	31	12
Balance, End of period	246	201	246	201
Collectively evaluated for impairment	246		246		215
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	445	389	455	461
Charge-offs		(11)	(6)	(110)
Recoveries	2	2	5	6
Provision	47	29	40	52
Balance, End of period	494	409	494	409
Individually evaluated for impairment	4		4
Collectively evaluated for impairment	490		490		455
Auto Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,908	1,925	1,880	1,570
Charge-offs	(460)	(369)	(1,521)	(746)
Recoveries	213	37	673	154
Provision	205	494	834	1,109
Balance, End of period	1,866	2,087	1,866	2,087
Individually evaluated for impairment	179		179		113
Collectively evaluated for impairment	1,687		1,687		1,767
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	24	25	25	27
Charge-offs			(4)
Recoveries	1	2	7	6
Provision	(2)	(2)	(5)	(8)
Balance, End of period	23	25	23	25
Collectively evaluated for impairment	23		23		25
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	596	495	308	161
Provision	(595)	(79)	(307)	255
Balance, End of period	1	$ 416	1	$ 416
Collectively evaluated for impairment	$ 1		$ 1		$ 308

Loans Receivable, Net and All50

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, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	5	8	10
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	3	5	7
Pre-Modification Outstanding Recorded Investment	$ 529	$ 248	$ 902	$ 916
Post-Modification Outstanding Recorded Investment	$ 529	$ 248	$ 902	$ 916
Real Estate Loans [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1	1	2
Pre-Modification Outstanding Recorded Investment		$ 1,612	$ 93	$ 1,689
Post-Modification Outstanding Recorded Investment		$ 1,612	$ 93	$ 1,689
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1		1
Pre-Modification Outstanding Recorded Investment		$ 7		$ 7
Post-Modification Outstanding Recorded Investment		$ 7		$ 7
Auto Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1		1
Pre-Modification Outstanding Recorded Investment	$ 13		$ 13
Post-Modification Outstanding Recorded Investment	$ 13		$ 13
Other [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	3	5	8	10
Pre-Modification Outstanding Recorded Investment	$ 542	$ 1,867	$ 1,029	$ 2,612
Post-Modification Outstanding Recorded Investment	$ 542	$ 1,867	$ 1,029	$ 2,612

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits by Major Classifications (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Banking And Thrift [Abstract]
Non-interest bearing demand accounts	$ 154,705	$ 142,924
Interest bearing demand accounts	156,395	167,259
Money market accounts	244,650	249,947
Savings and club accounts	147,260	142,021
Certificates of deposit	513,452	512,669
Total	$ 1,216,462	$ 1,214,820

Net Periodic Benefit Cost-Def52

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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Compensation Related Costs [Abstract]
Service Cost	$ 69	$ 249	$ 447	$ 747
Interest Cost	208	246	651	736
Expected return on plan assets	(348)	(311)	(1,037)	(933)
Amortization of unrecognized loss	23	119	182	358
Net periodic benefit cost	$ (48)	$ 303	$ 243	$ 908

Net Periodic Benefit Cost-Def53

Net Periodic Benefit Cost-Defined Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Compensation And Retirement Disclosure [Abstract]
Projected benefit obligation		$ (7,100)
Tax effected	$ 12	$ 4,700	$ 78	$ 4,829	$ 236

Equity Incentive Plan - Additio

Equity Incentive Plan - Additional Information (Detail) - USD ($)	Mar. 29, 2017	Dec. 13, 2016	Mar. 04, 2016	May 20, 2015	Jul. 22, 2014	Apr. 01, 2013	May 23, 2008	Jun. 30, 2017	Jun. 30, 2016
Compensation Related Costs Disclosure [Line Items]
Stock option granted								0
Option vesting period								5 years
Option expiration period								10 years
Share-based compensation expense								$ 245,000	$ 141,000
Equity Incentive Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant								2,377,326
2016 Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant								250,000
Further number of shares, grants								0
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
Restricted stock granted	3,296	20,675	23,491	21,843	19,880	30,000	590,320
Share-based compensation expense								$ 231,000	$ 325,000
Restricted Stock [Member] | 2013 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								18 months
Restricted Stock [Member] | 2014 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								39 months
Expected future expense								$ 16,000
Remaining vesting periods								3 months
Restricted Stock [Member] | 2015 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								40 months
Expected future expense								$ 102,000
Remaining vesting periods								1 year 3 months
Restricted Stock [Member] | March 4, 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								43 months
Restricted Stock [Member] | 12/13/16 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								46 months
Restricted Stock [Member] | March 29, 2017 [Member] | Tranche One [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								42 months
Restricted shares vested, Number of shares								1,296
Expected future expense								$ 24,000
Remaining vesting periods								1 year 3 months
Outstanding nonvested restricted stock								1,296
Restricted Stock [Member] | March 29, 2017 [Member] | Tranche Two [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								18 months
Restricted shares vested, Number of shares								2,000
Expected future expense								$ 17,000
Remaining vesting periods								3 years 3 months
Outstanding nonvested restricted stock								2,000
Restricted Stock [Member] | 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense								$ 192,000
Remaining vesting periods								2 years 3 months
Restricted Stock [Member] | December Two Thousand Sixteen Plan
Compensation Related Costs Disclosure [Line Items]
Expected future expense								$ 290,000
Remaining vesting periods								3 years 3 months
Non Qualified Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Stock option granted							1,140,469
Incentive Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Stock option granted							317,910

Equity Incentive Plan - Schedul

Equity Incentive Plan - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options, Outstanding, September 30, 2016	905,987
Number of Stock Options, Granted	0
Number of Stock Options, Exercised	544,341
Number of Stock Options, Forfeited	0
Number of Stock Options, Outstanding, June 30, 2017	361,646	905,987
Number of Stock Options, Exercisable at year-end	361,646
Weighted-average Exercise Price, Outstanding, September 30, 2016	$ 12.35
Weighted-average Exercise Price, Granted	0
Weighted-average Exercise Price, Exercised	12.35
Weighted-average Exercise Price, Forfeited	0
Weighted-average Exercise Price, Outstanding June 30, 2017	12.35	$ 12.35
Weighted-average Exercise Price, Exercisable at year-end	$ 12.35
Weighted-average Remaining Contractual Term (in years), Outstanding	11 months 1 day	1 year 8 months 2 days
Weighted-average Remaining Contractual Term (in years), Granted	0 years
Weighted-average Remaining Contractual Term (in years), Exercised	11 months 1 day
Weighted-average Remaining Contractual Term (in years), Forfeited	0 years
Weighted-average Remaining Contractual Term (in years), Exercisable	11 months 1 day
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 1,341
Aggregate Intrinsic Value, Granted	0
Aggregate Intrinsic Value, Exercised	0
Aggregate Intrinsic Value, Forfeited	0
Aggregate Intrinsic Value, Outstanding, Ending Balance	857	$ 1,341
Aggregate Intrinsic Value, Exercisable at year-end	$ 857

Equity Incentive Plan - Sched56

Equity Incentive Plan - Schedule of Restricted Stock Option Activity (Detail) - Restricted Stock [Member]	9 Months Ended
	Jun. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Stock, Nonvested at September 30, 2016 | shares	31,896
Number of Restricted Stock, Granted | shares	23,971
Number of Restricted Stock, Vested | shares	0
Number of Restricted Stock, Forfeited | shares	0
Number of Restricted Stock, Nonvested at June 30, 2017 | shares	55,867
Weighted-average Grant Date Fair Value, Nonvested at September 30, 2016 | $ / shares	$ 13.01
Weighted-average Grant Date Fair Value, Granted | $ / shares	16.28
Weighted-average Grant Date Fair Value, Vested | $ / shares	0
Weighted-average Grant Date Fair Value, Forfeited | $ / shares	0
Weighted-average Grant Date Fair Value, Nonvested at June 30, 2017 | $ / shares	$ 14.50

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Securities, Derivatives, Other Real Estate Owned and Impaired Loans Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	$ 387,608	$ 390,410
Derivatives	1,169	453
Foreclosed real estate	2,859	2,659
Impaired loans	16,052	22,218
Mortgage servicing rights	284	398
Fair Value, Measurements, Nonrecurring [Member]
Securities available-for-sale measured on a recurring basis
Foreclosed real estate	2,859	2,659
Mortgage-Backed Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	227,960	219,162
Obligations of States and Political Subdivisions [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	68,979	73,690
U.S. Government Agency Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	20,989	25,941
Corporate Obligations [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	44,754	38,418
Other Debt Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	24,901	33,174
Equity Securities-Financial Services [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	25	25
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	25	25
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities-Financial Services [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	25	25
Significant Other Observable Inputs (Level 2) [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	378,869	382,900
Derivatives	1,169	453
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	227,960	219,162
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	68,979	73,690
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	20,989	25,941
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	36,040	31,433
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	24,901	32,674
Significant Unobservable Inputs (Level 3) [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	8,714	7,485
Impaired loans	16,052	22,218
Mortgage servicing rights	284	398
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
Securities available-for-sale measured on a recurring basis
Foreclosed real estate	2,859	2,659
Significant Unobservable Inputs (Level 3) [Member] | Corporate Obligations [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities	$ 8,714	6,985
Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member]
Securities available-for-sale measured on a recurring basis
Total debt and equity securities		$ 500

Fair Value Measurement - Sche58

Fair Value Measurement - Schedule of Changes in Fair Value of Level III Investments (Detail) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 8,735	$ 7,136	$ 7,485	$ 4,211
Purchases, sales, issuances, settlements, net		3,000	756	6,000
Total unrealized gain (loss):
Included in other comprehensive income	(21)	76	473	1
Ending balance	$ 8,714	$ 10,212	$ 8,714	$ 10,212

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)Loan	Sep. 30, 2016USD ($)Loan
Fair Value Disclosures [Abstract]
Number of impaired loans | Loan	161	205
Impaired loans, carrying value	$ 16,600	$ 22,600
Impaired loans, valuation allowance	527	347
Impaired loans, net fair value	$ 16,100	$ 22,200

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Prepayment speeds	Prepayment speeds
Fair value input appraisal adjustments	15.70%	17.20%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	10.00%	8.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	30.00%	33.00%
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 16,052	$ 22,218
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	24.10%	23.00%
Impaired Loans [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Techniques	Appraisal of collateral	Appraisal of collateral
Impaired Loans [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	0.00%	0.00%
Impaired Loans [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	57.00%	50.00%
Foreclosed Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 2,859	$ 2,659
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	21.90%	22.10%
Foreclosed Real Estate Owned [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Techniques	Appraisal of collateral	Appraisal of collateral
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	20.00%	20.00%
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	50.00%	50.00%
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 284	$ 398
Unobservable Input	Discount rate	Discount rate
Fair value input appraisal adjustments	11.60%	12.00%
Mortgage Servicing Rights [Member] | Appraisal of Collateral [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Techniques	Discounted cash flow	Discounted cash flow
Mortgage Servicing Rights [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	11.00%
Mortgage Servicing Rights [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	16.00%

Fair Value Measurement - Sche61

Fair Value Measurement - Schedule of Estimate of Fair Value Using Methodologies (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Financial assets:
Investment and mortgage backed securities available for sale	$ 387,608	$ 390,410
Loans receivable, net	16,100	22,200
Mortgage servicing rights	284	398
Derivatives	1,169	453
Bank-owned life insurance	37,368	36,593
Financial liabilities:
Other borrowings	198,168	230,601
Advances by borrowers for taxes and insurance	12,213	4,956
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	25	25
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	378,869	382,900
Derivatives	1,169	453
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	8,714	7,485
Mortgage servicing rights	284	398
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	33,559	43,658
Certificates of deposit	1,000	1,250
Investment and mortgage backed securities available for sale	387,608	390,410
Loans receivable, net	1,224,206	1,219,213
Accrued interest receivable	5,839	5,769
Regulatory stock	15,120	15,463
Mortgage servicing rights	284	398
Derivatives	1,169	453
Bank-owned life insurance	37,368	36,593
Financial liabilities:
Deposits	1,216,462	1,214,820
Short-term borrowings	145,665	129,460
Other borrowings	198,168	230,601
Advances by borrowers for taxes and insurance	12,213	4,956
Accrued interest payable	1,189	1,046
Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	33,559	43,658
Certificates of deposit	1,006	1,269
Investment and mortgage backed securities available for sale	387,608	390,410
Loans receivable, net	1,221,711	1,237,759
Accrued interest receivable	5,839	5,769
Regulatory stock	15,120	15,463
Mortgage servicing rights	284	398
Derivatives	1,169	453
Bank-owned life insurance	37,368	36,593
Financial liabilities:
Deposits	1,217,294	1,218,894
Short-term borrowings	145,665	129,460
Other borrowings	198,203	231,911
Advances by borrowers for taxes and insurance	12,213	4,956
Accrued interest payable	1,189	1,046
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	33,559	43,658
Investment and mortgage backed securities available for sale	25	25
Accrued interest receivable	5,839	5,769
Regulatory stock	15,120	15,463
Bank-owned life insurance	37,368	36,593
Financial liabilities:
Deposits	703,010	702,151
Short-term borrowings	145,665	129,460
Advances by borrowers for taxes and insurance	12,213	4,956
Accrued interest payable	1,189	1,046
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	378,869	382,900
Derivatives	1,169	453
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Certificates of deposit	1,006	1,269
Investment and mortgage backed securities available for sale	8,714	7,485
Loans receivable, net	1,221,711	1,237,759
Mortgage servicing rights	284	398
Financial liabilities:
Deposits	514,284	516,743
Other borrowings	$ 198,203	$ 231,911

Accumulated Other Comprehensi62

Accumulated Other Comprehensive Loss - Summary of Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 176,344
Total other comprehensive income	$ 606	$ 1,364	74	$ 2,322
Ending Balance	180,551		180,551
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(1,266)	(5,167)	(6,083)	(5,325)
Other comprehensive income (loss) before reclassifications			4,714
Amounts reclassified from accumulated other comprehensive loss, net of tax	12	78	115	236
Total other comprehensive income	12	78	4,829	236
Ending Balance	(1,254)	(5,089)	(1,254)	(5,089)
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,020)	3,730	3,952	2,930
Other comprehensive income (loss) before reclassifications	940	1,558	(5,032)	2,601
Amounts reclassified from accumulated other comprehensive loss, net of tax	(195)	(272)	(195)	(515)
Total other comprehensive income	745	1,286	(5,227)	2,086
Ending Balance	(1,275)	5,016	(1,275)	5,016
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	922		299
Other comprehensive income (loss) before reclassifications	(153)		474
Amounts reclassified from accumulated other comprehensive loss, net of tax	2		(2)
Total other comprehensive income	(151)		472
Ending Balance	771		771
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,364)	(1,437)	(1,832)	(2,395)
Other comprehensive income (loss) before reclassifications	787	1,558	156	2,601
Amounts reclassified from accumulated other comprehensive loss, net of tax	(181)	(194)	(82)	(279)
Total other comprehensive income	606	1,364	74	2,322
Ending Balance	$ (1,758)	$ (73)	$ (1,758)	$ (73)

Accumulated Other Comprehensi63

Accumulated Other Comprehensive Loss - Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Gain on sale of investments	$ 295	$ 413	$ 295	$ 781
Interest expense	(3,248)	(2,864)	(9,341)	(8,462)
Income taxes	(448)	(792)	(1,051)	(2,084)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Net of tax	181	194	82	279
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 investments	295	413	295	781
Income taxes	(100)	(141)	(100)	(266)
Net of tax	195	272	195	515
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Defined Benefit Pension Plan [Member]
Schedule of Available-for-sale Securities [Line Items]
Compensation and employee benefits	(23)	(119)	(182)	(358)
Income taxes	11	41	67	122
Net of tax	(12)	$ (78)	(115)	$ (236)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivatives [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest expense	(3)		3
Income taxes	1		(1)
Net of tax	$ (2)		$ 2

Derivatives And Hedging Activ64

Derivatives And Hedging Activities - Schedule of Fair Value of Derivative Financial Instruments as well as their Classification on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 1,169	$ 453
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 1,169	$ 453

Derivatives and Hedging Activ65

Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)Contract	Jun. 30, 2016USD ($)	Mar. 31, 2017USD ($)Contract	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Sep. 30, 2017USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Interest income	$ 14,408,000		$ 14,723,000		$ 43,437,000	$ 43,697,000
Interest expense	$ 3,248,000		$ 2,864,000		9,341,000	8,462,000
Increase (decrease) in accrued interest payable					$ 143,000	$ 218,000
Net liability position of derivatives		$ 0		$ 0
Minimum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Debt Instrument, collateral amount		0		0
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 income		$ 3,000
Interest expense				$ 3,000
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							$ 0
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Interest Rate Swaps [Member] | Variable Rate [Member] | FHLB Advances [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, number of instruments | Contract		3		3
Derivative, notional principal amount		$ 50,000,000		$ 50,000,000

Derivatives And Hedging Activ66

Derivatives And Hedging Activities - Schedule of Pre-Tax Net Gains (Losses) of Cash flow Hedges (Detail) - Designated as Hedging Instrument [Member] - Cash Flow Hedges of Interest Rate Risk [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Derivative Instruments Gain Loss [Line Items]
Loss Recognized in OCI on Derivative (Effective Portion)	$ 153
Gain Recognized in OCI on Derivative (Effective Portion)		$ 474
Gain Reclassified from Accumulated OCI into Income (Effective Portion)	3
(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(3)
Interest Rate Products [Member]
Derivative Instruments Gain Loss [Line Items]
Loss Recognized in OCI on Derivative (Effective Portion)	153
Gain Recognized in OCI on Derivative (Effective Portion)		474
Interest Rate Products [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain Reclassified from Accumulated OCI into Income (Effective Portion)	$ 3
(Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		$ (3)