ESSA Bancorp (ESSA) 10-K 14 Dec 17 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2017	Dec. 01, 2017	Mar. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	ESSA
Entity Registrant Name	ESSA Bancorp, Inc.
Entity Central Index Key	1,382,230
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,611,681
Entity Public Float			$ 149,967,780

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($)	Sep. 30, 2017	Sep. 30, 2016
ASSETS
Cash and due from banks	$ 36,008,000	$ 31,815,000
Interest-bearing deposits with other institutions	5,675,000	11,843,000
Total cash and cash equivalents	41,683,000	43,658,000
Certificates of deposit	500,000	1,250,000
Investment securities available for sale, at fair value	390,452,000	390,410,000
Loans receivable (net of allowance for loan losses of $9,365 and $9,056)	1,236,681,000	1,219,213,000
Regulatory stock, at cost	13,832,000	15,463,000
Premises and equipment, net	16,234,000	16,844,000
Bank-owned life insurance	37,626,000	36,593,000
Foreclosed real estate	1,424,000	2,659,000
Intangible assets, net	1,844,000	2,487,000
Goodwill	13,801,000	13,801,000
Deferred income taxes	10,422,000	11,885,000
Other assets	20,719,000	18,216,000
TOTAL ASSETS	1,785,218,000	1,772,479,000
LIABILITIES
Deposits	1,274,861,000	1,214,820,000
Short-term borrowings	137,446,000	129,460,000
Other borrowings	174,168,000	230,601,000
Advances by borrowers for taxes and insurance	5,163,000	4,956,000
Other liabilities	10,853,000	16,298,000
TOTAL LIABILITIES	1,602,491,000	1,596,135,000
STOCKHOLDERS’ EQUITY
Preferred stock ($.01 par value; 10,000,000 shares authorized, none issued)
Common stock ($.01 par value; 40,000,000 shares authorized, 18,133,095 issued; 11,596,263 and 11,393,558 outstanding at September 30, 2017 and 2016, respectively)	181,000	181,000
Additional paid-in capital	180,764,000	181,900,000
Unallocated common stock held by the Employee Stock Ownership Plan (“ESOP”)	(8,720,000)	(9,174,000)
Retained earnings	91,147,000	87,638,000
Treasury stock, at cost; 6,536,832 and 6,739,537 shares at September 30, 2017 and 2016, respectively	(79,891,000)	(82,369,000)
Accumulated other comprehensive loss	(754,000)	(1,832,000)
TOTAL STOCKHOLDERS’ EQUITY	182,727,000	176,344,000
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,785,218,000	$ 1,772,479,000

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Statement Of Financial Position [Abstract]
Allowance for loan losses	$ 9,365	$ 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	11,596,263	11,393,558
Treasury stock, shares outstanding	6,536,832	6,739,537

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
INTEREST INCOME
Loans receivable, including fees	$ 48,162	$ 49,084	$ 45,067
Investment securities:
Taxable	8,042	7,402	7,199
Exempt from federal income tax	1,194	1,074	965
Other investment income	920	806	948
Total interest income	58,318	58,366	54,179
INTEREST EXPENSE
Deposits	8,471	7,595	7,425
Short-term borrowings	1,449	658	431
Other borrowings	2,879	3,178	2,534
Total interest expense	12,799	11,431	10,390
NET INTEREST INCOME	45,519	46,935	43,789
Provision for loan losses	3,350	2,550	2,075
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	42,169	44,385	41,714
NONINTEREST INCOME
Service fees on deposit accounts	3,440	3,552	3,271
Services charges and fees on loans	1,337	1,176	1,152
Trust and investment fees	752	780	901
Gain on sale of investments, net	295	1,258	786
Earnings on bank-owned life insurance	1,033	938	935
Insurance commissions	747	843	790
Other	595	236	61
Total noninterest income	8,199	8,783	7,896
NONINTEREST EXPENSE
Compensation and employee benefits	24,420	23,630	20,606
Occupancy and equipment	4,472	5,129	4,150
Professional fees	2,886	2,529	1,983
Data processing	3,657	3,960	3,449
Advertising	1,137	1,061	974
Federal Deposit Insurance Corporation (“FDIC”) premiums	870	1,160	1,125
(Gain) loss on foreclosed real estate	(370)	27	(148)
Merger-related costs		245	285
Amortization of intangible assets	643	763	637
Other	3,723	4,354	3,804
Total noninterest expense	41,438	42,858	36,865
Income before income taxes	8,930	10,310	12,745
Income taxes	1,591	2,583	2,954
NET INCOME	$ 7,339	$ 7,727	$ 9,791
Earnings per share:
Basic	$ 0.69	$ 0.74	$ 0.94
Diluted	0.69	0.73	0.93
Dividends per share	$ 0.36	$ 0.36	$ 0.34

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 7,339	$ 7,727	$ 9,791
Investment securities available for sale:
Unrealized holding (loss) gain	(7,098)	2,808	4,240
Tax effect	2,414	(955)	(1,441)
Reclassification of gains recognized in net income	(295)	(1,258)	(786)
Tax effect	100	427	268
Net of tax amount	(4,879)	1,022	2,281
Pension plan adjustment:
Change in unrealized gains (losses)	8,039	(1,612)	(3,418)
Tax effect	(2,733)	548	1,162
Reclassification adjustment related to actuarial gains	226	463	241
Tax effect	(77)	(157)	(82)
Net of tax amount	5,455	(758)	(2,097)
Derivative and hedging activities adjustments:
Changes in unrealized holding gains on derivative included in net income	921	430
Tax effect	(416)	(146)
Reclassification adjustment for gains on derivatives included in net income	(5)	23
Tax effect	2	(8)
Net of tax amount	502	299
Total other comprehensive income	1,078	563	184
Comprehensive income	$ 8,417	$ 8,290	$ 9,975

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	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, 2014	$ 167,309	$ 181	$ 182,486	$ (10,079)	$ 77,413	$ (80,113)	$ (2,579)
Beginning Balance, Shares at Sep. 30, 2014		11,590,378
Net income	9,791				9,791
Other comprehensive income	184						184
Cash dividends declared	(3,546)				(3,546)
Stock-based compensation	113		113
Allocation of ESOP stock	561		109	452
Allocation of treasury shares to incentive plan			(413)			413
Allocation of treasury shares to incentive plan, Shares		21,843
Treasury shares purchased	(3,132)					(3,132)
Treasury shares purchased, Shares		(258,977)
Ending Balance at Sep. 30, 2015	171,280	$ 181	182,295	(9,627)	83,658	(82,832)	(2,395)
Ending Balance, Shares at Sep. 30, 2015		11,353,244
Net income	7,727				7,727
Other comprehensive income	563						563
Cash dividends declared	(3,747)				(3,747)
Stock-based compensation	192		192
Allocation of ESOP stock	612		159	453
Allocation of treasury shares to incentive plan			(287)			287
Allocation of treasury shares to incentive plan, Shares		23,491
Stock options exercised	18		(459)			477
Stock options exercised, Shares		39,523
Treasury shares purchased	(301)					(301)
Treasury shares purchased, Shares		(22,700)
Ending Balance at Sep. 30, 2016	$ 176,344	$ 181	181,900	(9,174)	87,638	(82,369)	(1,832)
Ending Balance, Shares at Sep. 30, 2016	11,393,558	11,393,558
Net income	$ 7,339				7,339
Other comprehensive income	1,078						1,078
Cash dividends declared	(3,830)				(3,830)
Stock-based compensation	331		331
Allocation of ESOP stock	686		232	454
Allocation of treasury shares to incentive plan			(293)			293
Allocation of treasury shares to incentive plan, Shares		23,971
Stock options exercised	$ 779		(1,406)			2,185
Stock options exercised, Shares	611,341	178,734
Ending Balance at Sep. 30, 2017	$ 182,727	$ 181	$ 180,764	$ (8,720)	$ 91,147	$ (79,891)	$ (754)
Ending Balance, Shares at Sep. 30, 2017	11,596,263	11,596,263

Consolidated Statement of Chan7

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Cash dividends declared, per share	$ 0.36	$ 0.36	$ 0.34
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.36	$ 0.36	$ 0.34

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 7,339,000	$ 7,727,000	$ 9,791,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,350,000	2,550,000	2,075,000
Provision for depreciation and amortization	1,305,000	1,661,000	1,326,000
Amortization and accretion of discounts and premiums, net	4,458,000	4,053,000	2,389,000
Net gain on sale of investment securities	(295,000)	(1,258,000)	(786,000)
Compensation expense from ESOP	686,000	612,000	561,000
Stock-based compensation	331,000	192,000	113,000
Increase in accrued interest receivable	(380,000)	(516,000)	(7,000)
(Decrease) increase in accrued interest payable	(3,000)	116,000	35,000
Earnings on bank-owned life insurance	(1,033,000)	(938,000)	(935,000)
Deferred federal income taxes	754,000	(158,000)	784,000
Increase in accrued pension liability	217,000	548,000	206,000
(Gain) loss on foreclosed real estate	(370,000)	27,000	(148,000)
Amortization of intangible assets	643,000	763,000	637,000
Other, net	2,480,000	2,780,000	3,295,000
Net cash provided by operating activities	19,482,000	18,159,000	19,336,000
INVESTING ACTIVITIES
Purchase of certificates of deposit			(250,000)
Certificate of deposit maturities	750,000	500,000	267,000
Investment securities available for sale:
Proceeds from sale of investment securities	17,378,000	63,370,000	20,953,000
Proceeds from principal repayments and maturities	60,776,000	75,155,000	60,241,000
Purchases	(87,176,000)	(112,056,000)	(74,531,000)
Increase in loans receivable, net	(25,765,000)	(973,000)	(49,790,000)
Redemption of regulatory stock	22,334,000	21,371,000	16,352,000
Purchase of regulatory stock	(20,703,000)	(22,114,000)	(15,899,000)
Purchase of bank owned life insurance		(5,000,000)
Investment in limited partnership	(1,132,000)	(367,000)
Proceeds from sale of foreclosed real estate	4,012,000	2,060,000	3,254,000
Capital improvements to foreclosed real estate	(36,000)		(85,000)
Acquisition, net of cash acquired		(16,174,000)
Purchase of premises, equipment, and software	(645,000)	(1,098,000)	(878,000)
Net cash (used for) provided by investing activities	(30,207,000)	4,674,000	(40,366,000)
FINANCING ACTIVITIES
Increase (decrease) in deposits, net	60,041,000	(34,207,000)	(37,135,000)
Net increase (decrease) in short-term borrowings	7,986,000	38,121,000	(16,681,000)
Proceeds from other borrowings	63,057,000	101,300,000	91,101,000
Repayment of other borrowings	(119,490,000)	(99,800,000)	(13,300,000)
Increase in advances by borrowers for taxes and insurance	207,000	683,000	180,000
Purchase of treasury stock shares		(301,000)	(3,132,000)
Exercising of stock options	779,000	18,000
Dividends on common stock	(3,830,000)	(3,747,000)	(3,546,000)
Net cash provided by (used for) financing activities	8,750,000	2,067,000	17,487,000
(Decrease) increase in cash and cash equivalents	(1,975,000)	24,900,000	(3,543,000)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	43,658,000	18,758,000	22,301,000
CASH AND CASH EQUIVALENTS AT END OF YEAR	41,683,000	43,658,000	18,758,000
Cash paid:
Interest	12,802,000	11,251,000	10,355,000
Income taxes	(389,000)	700,000	375,000
Noncash items:
Transfers from loans to foreclosed real estate	2,371,000	2,266,000	2,723,000
Pension plan curtailment	4,579,000
Unrealized holding (loss) gain on investment securities available for sale	$ (7,393,000)	1,550,000	$ 3,454,000
Noncash assets acquired:
Investments available for sale		36,275,000
Loans receivable		123,380,000
Regulatory stock		889,000
Premises and equipment		945,000
Accrued interest receivable		185,000
Intangible assets		1,491,000
Goodwill		3,542,000
Deferred tax assets		715,000
Other assets		1,989,000
Liabilities assumed:
Certificates of deposit		32,408,000
Deposits other than certificates of deposit		119,865,000
Accrued interest payable		64,000
Other liabilities		900,000
Net noncash assets acquired		16,174,000
Cash acquired		$ 8,481,000

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES A summary of significant accounting and reporting policies applied in the presentation of the accompanying financial statements follows: 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, Lackawanna, Luzerne, Delaware, Chester, and Montgomery 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 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. Use of Estimates in the Preparation of Financial Statements The accounting principles followed by the Company and its subsidiary and the methods of applying these principles conform to U.S. generally accepted accounting principles and to general practice within the banking industry. In preparing the consolidated financial statements, the Company 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. Securities The Company determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time but not necessarily to maturity. Any decision to sell a security classified as available for sale would be based on various factors, including significant movement in interest rates, changes in maturity mix of the Company’s assets and liabilities, liquidity needs, regulatory capital considerations, and other similar factors. Securities available for sale are carried at fair value. Unrealized gains and losses are reported in other comprehensive income (loss), net of the related deferred tax effects. Realized gains or losses, determined on the basis of the cost of the specific securities sold, are included in earnings. Premiums and discounts are recognized in interest income using the interest method over the period to maturity. Declines in the fair value of available-for-sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, the Company considers: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the issuer; and (3) the Company’s intent to sell the security or whether it’s more likely than not that the Company would be required to sell the security before its anticipated recovery in market value. Loans Receivable Loans receivable that the Company has the intent and ability to hold for the foreseeable future or until maturity or payoff are stated at their outstanding unpaid principal balances, net of an allowance for loan losses and any deferred fees and costs. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the yield (interest income) of the related loans. The Company is generally amortizing these amounts over the contractual life of the loan. The accrual of interest is generally discontinued when the contractual payment of principal or interest has become 90 days past due or the Company has serious doubts about further collectability of principal or interest, even though the loan is currently performing. A loan may remain on accrual status if it is in the process of collection and is either guaranteed or well secured. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on nonaccrual loans generally is either applied against principal or reported as interest income, according to the Company’s judgment as to the collectability of principal. Generally, loans are restored to accrual status when the obligation is brought current and has performed in accordance with the contractual terms for a reasonable period of time and the ultimate collectability of the total contractual principal and interest is no longer in doubt. Loans Acquired Loans acquired including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. Loans are evaluated individually to determine if there is evidence of deterioration of credit quality since origination. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining estimated life. Decreases in expected cash flows are recognized immediately as impairment. Any valuation allowances on these impaired loans reflect only losses incurred after acquisition. For purchased loans acquired that are not deemed impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Loans are aggregated and accounted for as a pool of loans if the loans being aggregated have common risk characteristics. Subsequent to the purchase date, the methods utilized to estimate the required allowance for credit losses for these loans is similar to originated loans; however, the Company records a provision for loan losses only when the required allowance exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loans. Allowance for Loan Losses The allowance for loan losses is established through provisions for loan losses charged against income. Loans deemed to be uncollectible are charged against the allowance for loan losses, and subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is maintained at a level by management which represents the evaluation of known and inherent risks in the loan portfolio at the Consolidated Balance Sheet date. Management’s periodic evaluation of the adequacy of the allowance is based on the Company’s past loan loss experience, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, composition of the loan portfolio, current economic conditions, and other relevant factors. This evaluation is inherently subjective, since it requires material estimates that may be susceptible to significant change, including the amounts and timing of future cash flows expected to be received on impaired loans. The allowance consists of specific and general components. The specific component relates to loans that are classified as impaired. For such loans an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers nonclassified loans and is based on historical loss experience adjusted for qualitative factors. All loans are considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and all loan types are considered impaired if the loan is restructured in a troubled debt restructuring. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is 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 classified as a troubled debt restructuring or is more than 180 days past due. A loan is considered to be a troubled debt restructuring (“TDR”) loan when the Company grants a concession to the borrower because of the borrower’s financial condition that it would not otherwise consider. 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 may be removed from the TDR status after one year of performance. Regulatory Stock Regulatory stock consists of Federal Home Loan Bank (“FHLB”) of Pittsburgh stock and Atlantic Community Bankers Bank stock. Regulatory stock is carried at cost. The Company is a member of the Federal Home Loan Bank System and holds stock in the Federal Home Loan Bank of Pittsburgh. As a member, the Company maintains an investment in the capital stock of the FHLB of Pittsburgh in an amount not less than 10 basis points of the outstanding member asset value plus 4.0 percent of its outstanding FHLB borrowings, as calculated throughout the year. The equity security is accounted for at cost and classified separately on the Consolidated Balance Sheet. The stock is bought from and sold to the FHLB based upon its $100 par value. The stock does not have a readily determinable fair value and as such is classified as restricted stock, carried at cost and evaluated by management. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) The significance of the decline in net assets of the FHLB as compared to the capital stock amount and the length of time this situation has persisted; (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance; (c) the impact of legislative and regulatory changes on the customer base of the FHLB; and (d) the liquidity position of the FHLB. With consideration given to these factors, management concluded that the stock was not impaired at September 30, 2017. Loan Servicing Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing assets are evaluated for impairment based upon a third-party appraisal. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. Impairment is recognized through a valuation allowance to the extent that fair value is less than the capitalized amount. The Company’s loan servicing assets at September 30, 2017 and 2016, were not impaired. Total servicing assets included in other assets as of September 30, 2017 and 2016, were $232,000 and $398,000, respectively. Premises and Equipment Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the useful lives of the related assets, which range from 10 to 40 years for buildings, land improvements, and leasehold improvements and 3 to 7 years for furniture, fixtures, and equipment. Expenditures for maintenance and repairs are charged to operations as incurred. Costs of major additions and improvements are capitalized. Derivative Instruments and Hedging Activities The Company records all derivatives on the consolidated balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. Bank-Owned Life Insurance (“BOLI”) The Company owns insurance on the lives of a certain group of key employees. The policies were purchased to help offset the increase in the costs of various fringe benefit plans, including healthcare. The cash surrender value of these policies is included as an asset on the Consolidated Balance Sheet, and any increase in cash surrender value is recorded as noninterest income on the Consolidated Statement of Income. In the event of the death of an insured individual under these policies, the Company would receive a death benefit which would be recorded as noninterest income. Foreclosed Real Estate Real estate owned acquired in settlement of foreclosed loans is carried at fair value minus estimated costs to sell. At acquisition of real estate acquired in settlement of foreclosed loans, the excess of the remaining loan balance over the asset’s estimated fair value less cost to sell is charged off against the allowance for loan losses. Subsequent declines in the asset’s value are recognized as noninterest expense in the Consolidated Statement of Income. Operating expenses of such properties, net of related income, are expensed in the period incurred. Goodwill and Intangible Assets Goodwill is not amortized, but it is tested at least annually for impairment in the fourth quarter, or more frequently if indicators of impairment are present. If the estimated current fair value of a reporting unit exceeds its carrying value, no additional testing is required and an impairment loss is not recorded. The Company uses market capitalization and multiples of tangible book value methods to determine the estimated current fair value of its reporting unit. Based on this analysis, no impairment was recorded in 2017 or 2016. The other intangible assets are assigned useful lives, which are amortized on an accelerated basis over their weighted-average lives. The Company periodically reviews intangible assets for impairment as events or changes in circumstances indicate that the carrying amount of such asset may not be recoverable. Based on these reviews, no impairment was recorded in 2017 and 2016. The following tables provide information for the carrying amount of goodwill and intangible assets (dollars in thousands). Goodwill 2017 2016 Balance at beginning of year $ 13,801 $ 10,259 Goodwill acquired - 3,542 Balance at end of year $ 13,801 $ 13,801 Intangible assets 2017 2016 Balance at beginning of year $ 2,487 $ 1,759 Intangible assets acquired - 1,491 Amortization (643 ) (763 ) Balance at end of year $ 1,844 $ 2,487 Amortizable intangible assets were composed of the following: September 30, 2017 2016 Gross Amount Accumulated Amortization (dollars in thousands) Customer data $ 4,787 $ 2,943 $ 2,300 2017 2016 Aggregate amortization expense: As of the years ended September 30 $ 643 $ 763 Estimated future amortization expense (dollars in thousands): 2018 $ 469 2019 309 2020 275 2021 272 2022 239 2023 190 2024 90 $ 1,844 Employee Benefit Plans The Bank maintains a noncontributory, defined benefit pension plan for all employees who have met age and length of service requirements. The Bank also maintains a defined contribution Section 401(k) plan covering eligible employees. The Company created an ESOP for the benefit of employees who meet certain eligibility requirements. The Company makes cash contributions to the ESOP on an annual basis. The Company maintains an equity incentive plan to provide for issuance or granting of shares of common stock for stock options or restricted stock. The Company has recorded stock-based employee compensation cost using the fair value method as allowed under generally accepted accounting principles. Management estimated the fair values of all option grants using the Black-Scholes option-pricing model. Management estimated the expected life of the options using the simplified method as allowed under generally accepted accounting principles. The risk-free rate was determined utilizing the treasury yield for the expected life of the option contract. Advertising Costs In accordance with generally accepted accounting principles, the Company expenses all advertising expenditures incurred. Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company; (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets; and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Income Taxes Deferred tax assets and liabilities are reflected based on the differences between the financial statement and the income tax basis of assets and liabilities using the enacted marginal tax rates. Deferred income tax expense and benefit are based on the changes in the deferred tax assets or liabilities from period to period. Deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which such items are expected to be realized or settled. As changes in tax rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. The Company files a consolidated federal income tax return and individual state income tax returns. The Company prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Benefits from tax positions should be recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold should be recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold should be derecognized in the first subsequent financial reporting period in which that threshold is no longer met. Cash and Cash Equivalents The Company has defined cash and cash equivalents as cash and due from banks and interest-bearing deposits with other institutions with original maturities of less than 90 days. Earnings Per Share The Company provides dual presentation of basic and diluted earnings per share. Basic earnings per share are calculated utilizing net income as reported as the numerator and average shares outstanding as the denominator. The computation of diluted earnings per share differs in that the dilutive effects of any options are adjusted for in the denominator. Comprehensive Income (Loss) The Company is required to present comprehensive income (loss) and its components in a full set of general-purpose financial statements for all periods presented. Other comprehensive income (loss) is composed of net unrealized holding gains or losses on its available-for-sale investment and mortgage-backed securities portfolio and derivative instruments, and changes in unrecognized pension cost. Fair Value Measurements The Company groups assets and liabilities carried at fair value in three levels, based on the markets in which the assets are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level I – Valuation is based upon quoted prices for identical instruments traded in active markets. • Level II – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level III – Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset. The Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements, in accordance with the fair value hierarchy in generally accepted accounting principles. Fair value measurements for most of the Company’s assets are obtained from independent pricing services that we have engaged for this purpose. When available, the Company, or the Company’s independent pricing service, use quoted market prices to measure fair value. If market prices are not available, fair value measurement is based upon models that incorporate available trade, bid, and other market information. Subsequently, all of the Company’s financial instruments use either of the foregoing methodologies to determine fair value adjustments recorded to our financial statements. In certain cases, however, when market observable inputs for model-based valuation techniques may not be readily available, we are required to make judgments about assumptions market participants would use in estimating the fair value of financial instruments. The degree of management judgment involved in determining the fair value of a financial instrument is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not fully available, management judgment is necessary to estimate fair value. In addition, changes in the market conditions may reduce the availability of quoted prices or observable data. When market data is not available, we use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, that could significantly affect the results of current or future valuations. Reclassification of Comparative Amounts Certain items previously reported have been reclassified to conform to the current year’s reporting format. Such reclassifications did not affect consolidated net income or consolidated stockholders’ equity. Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (a new revenue recognition standard) Revenue from Contracts with Customers (Topic 606) 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 March 2016, the FASB issued ASU 2016-09, Compensation – Stock Compensation (Topic 718) 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 In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20). In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715) In March 2017, the FASB issued ASU 2017 - , Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20). inning after 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 In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 850) In September 2017, the FASB issued ASU 2017-13, Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842 Amendments to SEC Paragraphs Pursuant to the Staff Announcement at the July 20, 2017 EITF Meeting and Rescission of Prior SEC Staff Announcements and Observer Comments. Revenue from Contracts with Customers Leases

Earnings per Share

Earnings per Share	12 Months Ended
	Sep. 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 years ended September 30, 2017, 2016, and 2015. 2017 2016 2015 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,606,116 ) (6,769,423 ) (6,682,911 ) Average unearned ESOP shares (882,617 ) (927,908 ) (973,168 ) Average unearned nonvested shares (42,629 ) (37,276 ) (22,560 ) Weighted-average common shares and common stock equivalents used to calculate basic earnings per share 10,601,733 10,398,488 10,454,456 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share - - 9,787 Additional common stock equivalents (stock options) used to calculate diluted earnings per share 61,724 120,580 78,887 Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share 10,663,457 10,519,068 10,543,130 At September 30, 2017 there were 43,953 shares of nonvested stock outstanding at an average weighted price of $14.50 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive. At September 30, 2016, there were 31,896 shares of nonvested stock outstanding at a price of $13.00 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive. At September 30, 2015, there were 12,230 shares of nonvested stock outstanding at a price of $11.07 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive.

Investment Securities

Investment Securities	12 Months Ended
	Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]
Investment Securities	3. INVESTMENT SECURITIES The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands): 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale Fannie Mae $ 119,333 $ 207 $ (1,203 ) $ 118,337 Freddie Mac 98,668 177 (808 ) 98,037 Governmental National Mortgage Association securities 17,609 43 (203 ) 17,449 Total mortgage-backed securities 235,610 427 (2,214 ) 233,823 Obligations of states and political subdivisions 64,382 1,522 (546 ) 65,358 U.S. government agency securities 18,615 61 (5 ) 18,671 Corporate obligations 49,025 335 (618 ) 48,742 Other debt securities 24,200 47 (414 ) 23,833 Total debt securities 391,832 2,392 (3,797 ) 390,427 Equity securities - financial services 25 - - 25 Total $ 391,857 $ 2,392 $ (3,797 ) $ 390,452 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 securities 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 September 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 $ 14,530 $ 14,536 Due after one year through five years 34,229 34,504 Due after five years through ten years 89,022 88,947 Due after ten years 254,051 252,440 Total $ 391,832 $ 390,427 For the years ended September 30, 2017, 2016, and 2015, the Company realized gross gains of $299,000, $1,258,000, and $796,000, and gross losses of $4,000, $0, and $10,000, respectively, and proceeds from the sale of investment securities of $17,378,000, $63,370,000, and $20,953,000, respectively. During the first quarter of 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. Investment securities with carrying values of $235,926,000 and $201,596,000 at September 30, 2017 and 2016, respectively, were pledged to secure public deposits and other purposes as required by law. The following table shows the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands): 2017 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 55 $ 61,852 $ (558 ) $ 20,679 $ (645 ) $ 82,531 $ (1,203 ) Freddie Mac 39 38,913 (354 ) 16,427 (454 ) 55,340 (808 ) Governmental National Mortgage Association securities 11 6,669 (41 ) 6,903 (162 ) 13,572 (203 ) Obligations of states and political subdivisions 25 10,944 (59 ) 17,425 (487 ) 28,369 (546 ) U.S. government agency securities 3 8,995 (5 ) - - 8,995 (5 ) Corporate obligations 22 15,119 (104 ) 8,032 (514 ) 23,151 (618 ) Other debt securities 19 7,141 (104 ) 13,806 (310 ) 20,947 (414 ) Total 174 $ 149,633 $ (1,225 ) $ 83,272 $ (2,572 ) $ 232,905 $ (3,797 ) 2016 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 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 securities 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, corporate obligations, obligations of states and political subdivisions and other debt securities. The Company reviews its position quarterly and has asserted that at September 30, 2017 and 2016, the declines outlined in the above table represent temporary declines and the Company would not be required to sell the security before its anticipated recovery in market value. The Company has concluded that any impairment of its investment securities portfolio at September 30, 2017 and 2016, is not other than temporary but is the result of interest rate changes that are not expected to result in the noncollection of principal and interest during the period.

Loans Receivable

Loans Receivable	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans Receivable	4. LOANS RECEIVABLE Loans receivable consist of the following (in thousands): 2017 2016 Real estate loans: Residential $ 586,708 $ 596,645 Construction 3,097 1,733 Commercial 318,323 288,447 Commercial 44,129 39,978 Obligations of states and political subdivisions 58,079 56,923 Home equity loans and lines of credit 46,219 48,163 Auto loans 186,646 193,078 Other 2,845 3,302 1,246,046 1,228,269 Less allowance for loan losses 9,365 9,056 Net loans $ 1,236,681 $ 1,219,213 Included in the September 30, 2017 balances are loans acquired from Eagle National Bank in 2015, First National Community Bank and Franklin Security Bank in 2014 and First Star Bank in 2012. Upon acquisition, the Company evaluated whether each acquired loan (regardless of size) was within the scope of ASC 310-30, Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality Changes in the accretable yield for purchased credit-impaired loans were as follows, since acquisition, for the periods ended September 30, 2017 and 2016 (in thousands): September 30, September 30, Balance at beginning of period $ 478 $ 258 Acquisition of ENB - 240 Reclassification and other 215 163 Accretion (222 ) (183 ) Balance at end of period $ 471 $ 478 Included in reclassification and other for loans acquired without specific evidence of deterioration in credit quality were $215,000 and $163,000 of reclassifications from nonaccretable discounts to accretable discounts in 2017 and 2016 respectively. The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): September 30, 2017 September 30, 2016 Acquired Loans with Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 5,490 $ 6,893 Carrying amount 4,388 5,563 There has been $155,000 in allowance for loan losses recorded for acquired loans with or without specific evidence of deterioration in credit quality as of September 30, 2017. There has been $236,000 in allowance for loan losses recorded for acquired loans with or without specific evidence of deterioration in credit quality as of September 30, 2016. In addition, no allowance for loan losses has been reversed. Loans serviced by the Company for others amounted to $61,167,000 and $78,497,000 at September 30, 2017 and 2016, respectively. The Company’s primary business activity is with customers located in counties where its branch offices are located and to a lesser extent, the contiguous counties in the Commonwealth of Pennsylvania. Commercial, residential, and consumer loans are granted. The Company also funds commercial and residential loans originated outside its immediate trade area provided such loans meet the Company’s credit policy guidelines. Although the Company has a diversified loan portfolio at September 30, 2017 and 2016, loans outstanding to individuals and businesses are dependent upon the local economic conditions in its immediate trade area. At September 30, 2017, 2016, and 2015, the Company had nonaccrual loans of $14,263,000, $19,315,000, and $20,105,000,respectively. Additional interest income that would have been recorded under the original terms of the loan agreements amounted to $449,000, $782,000, and $188,000, for the years ended September 30, 2017, 2016, and 2015, respectively. The following table shows the amount of loans in each category that was 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 September 30, 2017 Real estate loans: Residential $ 586,708 $ 6,202 $ - $ 580,506 Construction 3,097 - - 3,097 Commercial 318,323 7,211 3,775 307,337 Commercial 44,129 1,385 283 42,461 Obligations of states and political subdivisions 58,079 - - 58,079 Home equity loans and lines of credit 46,219 176 330 45,713 Auto Loans 186,646 572 - 186,074 Other 2,845 30 - 2,815 Total $ 1,246,046 $ 15,576 $ 4,388 $ 1,226,082 Total Loans Individually Evaluated for 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 subdivisions 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, 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. 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 the Company 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. The following table includes the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable, excluding purchased impaired credit loans. Also presented are 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). Recorded Investment Unpaid Principal Balance Associated Allowance Average Recorded Investment Interest Income Recognized September 30, 2017 With no specific allowance recorded: Real estate loans: Residential $ 4,392 $ 5,730 $ - $ 5,373 $ 39 Construction - - - - - Commercial 7,191 9,396 - 8,816 297 Commercial 1,385 1,575 - 1,579 120 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 176 258 - 231 - Auto loans 123 237 - 116 1 Other 30 36 - 8 - Subtotal 13,297 17,232 - 16,123 457 With an allowance recorded: Real estate loans: Residential 1,810 2,264 154 1,814 - Construction - - - - - Commercial 20 1,193 19 360 - Commercial - - - 30 - Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit - - - 3 - Auto loans 449 468 172 263 7 Other - - - - - Subtotal 2,279 3,925 345 2,470 7 Total: Real estate loans: Residential 6,202 7,994 154 7,187 39 Construction - - - - - Commercial 7,211 10,589 19 9,176 297 Commercial 1,385 1,575 - 1,609 120 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 176 258 - 234 - Auto loans 572 705 172 379 8 Other 30 36 - 8 - Total $ 15,576 $ 21,157 $ 345 $ 18,593 $ 464 Recorded Investment Unpaid Principal Balance Associated Allowance Average Recorded Investment Interest Income Recognized September 30, 2016 With no specific allowance recorded: Real estate loans: Residential $ 6,721 $ 9,016 $ - $ 7,560 $ 82 Construction - - - - - Commercial 10,939 12,928 - 12,490 496 Commercial 1,698 1,725 - 1,556 124 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 361 432 - 553 2 Auto loans 253 365 - 295 2 Other 22 22 - 6 - Subtotal 19,994 24,488 - 22,460 706 With an allowance recorded: Real estate loans: Residential 2,000 2,151 198 2,314 12 Construction - - - - - Commercial 298 303 36 1,118 - Commercial - - - 2 - Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit - - - 90 - Auto loans 273 273 113 241 10 Other - - - - - Subtotal 2,571 2,727 347 3,765 22 Total: Real estate loans: Residential 8,721 11,167 198 9,874 94 Construction - - - - - Commercial 11,237 13,231 36 13,608 496 Commercial 1,698 1,725 - 1,558 124 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 361 432 - 643 2 Auto loans 526 638 113 536 12 Other 22 22 - 6 - Total $ 22,565 $ 27,215 $ 347 $ 26,225 $ 728 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 greater than 90 days past due are considered Substandard. Loans in the Doubtful category have all the weaknesses inherent in one classified Substandard with the added characteristic that the 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. To help ensure that risk ratings are accurate and reflect the present and future capacity of borrowers to repay a loan as agreed, the Company 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 Company’s Commercial Loan Officers are responsible for the timely and accurate risk rating of the loans in their portfolios at origination and on an ongoing basis. The Company’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 Company engages an external consultant to conduct loan reviews on at least a semiannual 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 evaluated for impairment are given separate consideration in the determination of the allowance. The following table presents the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful within the internal risk rating system as of September 30, 2017 and 2016 (in thousands): Pass Special Mention Substandard Doubtful Total September 30, 2017 Commercial real estate loans $ 300,554 $ 3,376 $ 14,393 $ - $ 318,323 Commercial 40,996 32 3,101 - 44,129 Obligations of states and political subdivisions 58,079 - - - 58,079 Total $ 399,629 $ 3,408 $ 17,494 $ - $ 420,531 Pass Special Mention Substandard Doubtful 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 nonperforming. For residential real estate loans, construction real estate loans, home equity loans and lines of credit, auto loans, and other loans, the Company evaluates credit quality based on the performance of the individual credits. The following table presents the recorded investment in the loan classes based on payment activity as of September 30, 2017 and 2016 (in thousands): Performing Nonperforming Purchased Credit Impaired Total September 30, 2017 Real estate loans: Residential $ 580,116 $ 6,592 $ - $ 586,708 Construction 3,097 - - 3,097 Home equity loans and lines of credit 45,576 313 330 46,219 Auto Loans 185,910 736 - 186,646 Other 2,807 38 - 2,845 Total $ 817,506 $ 7,679 $ 330 $ 825,515 Performing Nonperforming Purchased Credit Impaired 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 table presents the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of September 30, 2017 and 2016 (in thousands): 31-60 Days 61-90 Days Greater than 90 Days Past Due and Total Purchased Credit Total Current Past Past Accruing Non­accrual Past Accruing Non­accrual Loans September 30, 2017 Real estate loans: Residential $ 577,034 $ 2,661 $ 421 $ - $ 6,592 $ 9,674 $ - $ - $ 586,708 Construction 3,097 - - - - - - - 3,097 Commercial 312,098 172 - - 2,278 2,450 612 3,163 318,323 Commercial 43,298 18 - - 530 548 - 283 44,129 Obligations of states and political subdivisions 58,079 - - - - - - - 58,079 Home equity loans and lines of credit 45,460 101 15 - 313 429 - 330 46,219 Auto loans 185,247 631 32 - 736 1,399 - - 186,646 Other 2,789 14 4 - 38 56 - - 2,845 Total $ 1,227,102 $ 3,597 $ 472 $ - $ 10,487 $ 14,556 $ 612 $ 3,776 $ 1,246,046 31-60 Days 61-90 Days Greater than 90 Days Past Due and Total Purchased Credit Total Current Past Past Accruing Non­accrual Past Accruing Non­accrual 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 (“ALL”) 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, (2) an allocated allowance based on general economic conditions and other risk factors in our markets and portfolios, and (3) an unallocated allowance not to exceed 10% of total reserves which acts as a contingency against unforeseen future events which may negatively impact the Company’s loan portfolio. 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 September 30, 2017, is 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, as an integral part of their examination process, have periodically reviewed the Company’s allowance for loan losses. The banking regulators may require that the Company recognize additions to the allowance based on their analysis and review of information available to it at the time of their 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 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 the primary segments of the ALL, segregated into the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of September 30, 2017, 2016 and 2015 (in thousands): Real Estate Loans Obligations of States and Political Home Loans and Lines of Residential Construction Commercial Commercial Subdivisions Credit Auto Other Unallocated Total ALL balance at September 30, 2014 $ 5,573 $ 11 $ 663 $ 528 $ 163 $ 470 $ 459 $ 32 $ 735 $ 8,634 Charge-offs (1,359 ) - (65 ) (30 ) - (27 ) (596 ) (6 ) - (2,083 ) Recoveries 76 - 84 23 - 15 87 8 - 293 Provision 850 (4 ) (11 ) 172 26 3 1,620 (7 ) (574 ) 2,075 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 Charge-offs (1,040 ) - (266 ) (18 ) - (209 ) (1,262 ) - - (2,795 ) Recoveries 59 - 52 7 - 9 246 9 - 382 Provision 267 6 395 200 26 194 1,326 (11 ) 147 2,550 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (504 ) - (1,352 ) (31 ) - (18 ) (2,009 ) (9 ) - (3,923 ) Recoveries 22 - 27 1 - 8 815 9 - 882 Provision (66 ) 10 2,231 135 33 25 1,150 (4 ) (164 ) 3,350 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 Individually evaluated for impairment $ 154 $ - $ 19 $ - $ - $ - $ 172 $ - $ - $ 345 Collectively evaluated for impairment 3,724 23 1,739 987 248 470 1,664 21 144 9,020 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 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. The Company allocated increased provisions to the construction loan, commercial real estate, commercial, obligations of states and political subdivisions, home equity loans and lines of credit, and auto loan segments for the year ended September 30, 2017, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Commercial real estate loans, which had charge offs of $1.4 million and balance increases of $29.9 million for the year ended September 30, 2017, had the largest increase in provisions. The Company allocated decreased allowance for loan loss provisions to the residential real estate and other loan segments due to either declining loan balances and/or actual loss experience being less than previously estimated. The provision for auto loans declined from $1.3 million to $1.2 million due to declining balances offsetting net (of recoveries) charge off activity. The Company allocated increased provisions to the construction loan, commercial real estate, commercial, obligations of states and political subdivisions, residential real estate, and indirect auto loan segments for the year ended September 30, 2016, due to either increased loan balances, changes in the loan mix within the pool, and/or charge-off activity in those segments. Auto loans, which had charge offs of $1.3 million and balance increases of $30.9 million for the year ended September 30, 2016, had the largest increase in provisions. The Company allocated decreased allowance for loan loss provisions to the other loan segments due to declining loan balances and actual loss experience being less than previously estimated. The Company allocated increased provisions to the residential real estate, commercial, obligations of states and political subdivisions, home equity loans and lines of credit, and auto loans segments for the year ended September 30, 2015, due to either increased loans balances and/or charge-off activity in those segments. Outstanding loan balances of auto loans, which increased $61.6 million from September 30, 2014 to September 30, 2015, had the largest increase in provisions. 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 restructurings granted during the periods indicated (in thousands). For the Year Ended September 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled debt restructurings Real estate loans: Residential 6 $ 1,154 $ 1,167 Construction - - - Commercial 2 1,208 1,163 Commercial - - - Obligations of states and political subdivisions - - - Home equity loans and lines of credit - - - Auto loans 2 37 37 Other 1 22 22 Total 11 $ 2,421 $ 2,389 For the Year Ended September 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled debt restructurings Real estate loans: Residential 12 $ 1,701 $ 1,701 Construction - - - Commercial 4 2,139 2,139 Commercial - - - Obligations of states and political subdivisions - - - Home equity loans and lines of credit 1 5 5 Auto loans - - - Other - - - Total 17 $ 3,845 $ 3,845 Of the eleven new troubled debt restructurings granted for the year ended September 30, 2017, three loans totaling $1.2 million were granted terms concessions, six loans totaling $832,000 were granted terms and rate concessions and two loans totaling $368,000 were granted rate concessions. Of the seventeen new troubled debt restructurings granted for the year ended September 30, 2016, eight loans totaling $2.4 million were granted terms and rate concessions and seven loans totaling $1.5 million were granted terms concessions and two loans totaling $29,000 was granted an interest rate concession. For the year ended September 30, 2017 there were no loan modifications classified as troubled debt restructurings that subsequently defaulted within one year of modification. For the year ended September 30, 2016 there were no loan modifications classified as troubled debt restructurings that subsequently defaulted 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 on the Consolidated Balance Sheet. As of September 30, 2017, included within the foreclosed assets is $819,000

Premises and Equipment

Premises and Equipment	12 Months Ended
	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Premises and Equipment	5. PREMISES AND EQUIPMENT Premises and equipment consist of the following (in thousands): 2017 2016 Land and land improvements $ 6,269 $ 6,269 Buildings and leasehold improvements 17,047 16,861 Furniture, fixtures, and equipment 11,412 11,159 Construction in process 30 2 34,758 34,291 Less accumulated depreciation (18,524 ) (17,447 ) Total $ 16,234 $ 16,844 Depreciation expense amounted to $1,077,000, $1,456,000, and $1,131,000, for the years ended September 30, 2017, 2016, and 2015, respectively.

Deposits

Deposits	12 Months Ended
	Sep. 30, 2017
Banking And Thrift [Abstract]
Deposits	6. DEPOSITS Deposits and their respective weighted-average interest rates consist of the following major classifications (in thousands): 2017 2016 Weighted- Average Interest Rate Amount Weighted- Average Interest Rate Amount Noninterest-bearing demand accounts — % $ 160,125 — % $ 142,924 Interest bearing demand accounts 0.24 208,369 0.13 167,259 Money market accounts 0.51 253,949 0.31 249,947 Savings and club accounts 0.05 141,521 0.05 142,021 Certificates of deposit 1.39 510,897 1.20 512,669 Total 0.70 % $ 1,274,861 0.64 % $ 1,214,820 2017 2016 Weighted- Average Interest Rate Amount Weighted- Average Interest Rate Amount Certificates of deposit: 0.00 - 2.00% 1.30 % $ 460,132 1.14 % $ 484,341 2.01 - 4.00% 2.19 50,765 2.26 28,328 Total 1.39 % $ 510,897 1.20 % $ 512,669 At September 30, 2017 scheduled maturities of certificates of deposit are as follows (in thousands): 2018 $ 291,086 2019 121,643 2020 57,124 2021 14,577 2022 26,467 Total $ 510,897 Brokered deposits totaled $139,736,000 and $198,600,000 at September 30, 2017 and 2016, respectively. The aggregate amount of certificates of deposit with a minimum denomination of $250,000 were $71,073,000 and $29,478,000 at September 30, 2017 and 2016, respectively. The scheduled maturities of certificates of deposit in denominations of $250,000 or more as of September 30, 2017, are as follows (in thousands): Within three months $ 11,082 Three through six months 26,824 Six through twelve months 14,803 Over twelve months 18,364 Total $ 71,073

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Short-Term Borrowings	7. SHORT-TERM BORROWINGS As of September 30, 2017 and 2016, the Company had $137,446,000 and $129,460,000 of short-term borrowings, respectively, of which $10.0 million in 2017 and $0 in 2016 were advances on a $150,000,000 line of credit with the FHLB. All borrowings from the FHLB are secured by a blanket lien on qualified collateral, defined principally as investment securities and mortgage loans that are owned by the Company free and clear of any liens or encumbrances. At September 30, 2017, the Company had a borrowing limit of approximately $612.1 million, with a variable rate of interest, based on the FHLB’s cost of funds. The following table sets forth information concerning short-term borrowings (in thousands): 2017 2016 2015 Balance at year-end $ 137,466 $ 129,460 $ 91,339 Maximum amount outstanding at any month-end 185,201 182,636 132,533 Average balance outstanding during the year 147,765 120,590 115,006 Weighted-average interest rate: As of year-end 1.36 % 0.64 % 0.40 % Paid during the year 0.98 % 0.55 % 0.37 % Average balances outstanding during the year represent daily average balances, and average interest rates represent interest expenses divided by the related average balance.

Other Borrowings

Other Borrowings	12 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Other Borrowings	8. OTHER BORROWINGS The following table presents contractual maturities of FHLB long-term advances (in thousands): Maturity Range Weighted- Average Stated Interest Rate Ranged Description From To Interest Rate From To 2017 2016 Convertible 12/5/2018 12/5/2018 3.30 % 3.30 % 3.30 % $ 5,000 $ 5,000 Fixed rate 10/23/2017 10/27/2020 1.68 0.89 2.85 75,601 98,851 Mid-term 10/23/2017 9/9/2019 1.29 0.76 1.66 93,567 126,750 Total $ 174,168 $ 230,601 Maturities of FHLB long-term advances are summarized as follows (in thousands): Year Ending September 30, Amount Weighted- Average Rate 2018 $ 89,075 1.29 % 2019 70,247 1.78 2020 11,746 1.70 2021 3,100 1.57 Total $ 174,168 1.52 % Included above is one convertible note for $5,000,000 which is convertible to a variable-rate advance on specific dates at the discretion of the FHLB. Should the FHLB convert this advance, the Bank has the option of accepting the variable rate or repaying the advance without penalty. The FHLB long-term advances are secured by qualifying assets of the Bank, which include the FHLB stock, securities, and first-mortgage loans.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	9. INCOME TAXES The provision for income taxes consists of (in thousands): 2017 2016 2015 Current: Federal $ 837 $ 3,456 $ 2,154 State — — 16 Total current taxes 837 3,456 2,170 Deferred income tax benefit 754 (873 ) 784 Total income tax provision $ 1,591 $ 2,583 $ 2,954 The tax effects of deductible and taxable temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 3,184 $ 3,079 Adjustment to record funded status of pension plan 324 3,134 Investment losses subject to Section 382 limitation 4,562 5,018 Purchase accounting adjustment 341 49 Net unrealized loss on securities 478 — Deferred compensation 631 643 Other real estate owned 273 293 Nonaccrual interest 223 332 Other 3,385 3,669 Total gross deferred tax assets 13,401 16,217 Deferred tax liabilities: Pension plan 924 998 Net unrealized gain on securities — 2,036 Mortgage servicing rights 80 93 Premises and equipment 12 218 Net unrealized gain on derivatives 413 102 Other 1,550 885 Total gross deferred tax liabilities 2,979 4,332 Net deferred tax assets $ 10,422 $ 11,885 The Company establishes a valuation allowance for deferred tax assets when management believes that the deferred tax assets are not likely to be realized either through a carryback to taxable income in prior years, future reversals of existing taxable temporary differences, and, to a lesser extent, future taxable income. Accounting principles prescribe a recognition threshold and a measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Benefits from tax positions should be recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold should be recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold should be derecognized in the first subsequent financial reporting period in which that threshold is no longer met. There is currently no liability for uncertain tax positions and no known unrecognized tax benefits. The Company recognizes, when applicable, interest and penalties related to unrecognized tax benefits in the provision for income taxes in the Consolidated Statement of Income. The Company’s federal and state income tax returns for taxable years through 2012 have been closed for purposes of examination by the Internal Revenue Service and the Pennsylvania Department of Revenue. The reconciliation of the federal statutory rate and the Company’s effective income tax rate is as follows (in thousands): 2017 2016 2015 Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 3,036 34.0 % $ 3,505 34.0 % $ 4,333 34.0 % Income from bank-owned life insurance (351 ) (3.9 ) (319 ) (3.1 ) (318 ) (2.5 ) Tax-exempt income (843 ) (9.5 ) (826 ) (8.0 ) (752 ) (5.9 ) Low-income housing credits (197 ) (2.2 ) (226 ) (2.2 ) (254 ) (2.0 ) Nondeductible merger expenses — — 89 0.9 21 0.2 Other, net (54 ) (0.6 ) 360 3.5 (76 ) (0.6 ) Actual tax expense and effective rate $ 1,591 17.8 % $ 2,583 25.1 % $ 2,954 23.2 % The Bank is subject to the Pennsylvania Mutual Thrift Institutions Tax that is calculated at 11.5 percent of earnings based on U.S. generally accepted accounting principles with certain adjustments. Retained earnings include $4.6 million at September 30, 2017, for which no provision for federal income tax has been made. This amount represents deductions for bad debt reserves for tax purposes, which were only allowed to savings institutions that met certain definitional tests prescribed by the Internal Revenue Code of 1986, as amended. The Small Business Job Protection Act of 1996 eliminated the special bad debt deduction granted solely to thrifts. Under the terms of the Act, there would be no recapture of the pre-1988 (base year) reserves. However, these pre-1988 reserves would be subject to recapture under the rules of the Internal Revenue Code if the Bank itself pays a cash dividend in excess of earnings and profits or liquidates. The Act also provides for the recapture of deductions arising from the Bank’s applicable excess reserve, which is defined as the total amount of reserve over the base year reserve. The Bank’s total reserve exceeds the base year reserve, and deferred taxes have been provided for this excess.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	10. COMMITMENTS AND CONTINGENT LIABILITIES In the normal course of business, management makes various commitments that are not reflected in the consolidated financial statements. These commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Balance Sheet. The Company’s exposure to credit loss in the event of nonperformance by the other parties to the financial instruments is represented by the contractual amounts as disclosed. Losses, if any, are charged to the allowance for loan losses. The Company minimizes its exposure to credit loss under these commitments by subjecting them to credit approval and review procedures and collateral requirements, as deemed necessary, in compliance with lending policy guidelines. The off-balance sheet commitments consist of the following (in thousands): 2017 2016 Commitments to extend credit $ 67,265 $ 82,223 Standby letters of credit 2,810 3,187 Unfunded lines of credit 77,390 59,620 Commitments to extend credit consist of fixed and variable rate commitments with interest rates ranging from 2.60 percent to 6.25 percent. The commitments outstanding at September 30, 2017, contractually mature in less than one year. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Balance Sheet. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The amount of collateral obtained, as deemed necessary, is based upon management’s credit evaluation in compliance with the lending policy guidelines. Since many of the credit line commitments are expected to expire without being fully drawn upon, the total contractual amounts do not necessarily represent future funding requirements. Standby letters of credit and financial guarantees represent conditional commitments issued to guarantee performance of a customer to a third party. The coverage period for these instruments is typically a one-year period with renewal option subject to prior approval by management. Fees earned from the issuance of these letters are recognized over the coverage period. For secured letters of credit, the collateral is typically Company deposit instruments. The Company is required to maintain a reserve balance with certain third party providers. At September 30, 2017 the reserve balance was $1.2 million. 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. 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. The parties attended a mediation in October, 2017 where they reached a tentative agreement to resolve the claims asserted against the Bank on a class wide basis. The terms of the settlement are still being negotiated, but the tentative agreement calls for the Bank to make a payment of $1,325,000 to the plaintiffs. The Bank’s insurance carrier will cover the payment made by the Bank in excess of a $125,000 retention. The settlement, when fully negotiated, will still be subject to court approval. 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.

Lease Commitments and Total Ren

Lease Commitments and Total Rental Expense	12 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Lease Commitments and Total Rental Expense	11. LEASE COMMITMENTS AND TOTAL RENTAL EXPENSE The Company leases various branch locations and other offices under long-term operating leases. Future minimum lease payments by year and in the aggregate, under noncancellable operating leases with initial or remaining terms of one year or more, consisted of the following at September 30, 2017 (in thousands): 2018 $ 920 2019 780 2020 706 2021 515 2022 351 2023 and beyond 946 Total $ 4,218 The total rental expenses for the above leases for the years ended September 30, 2017, 2016, and 2015, were $1.3 million, $1.3 million, and $917,000, respectively. The Company also operates six offices that currently do not have long-term operating leases.

Employee Benefits

Employee Benefits	12 Months Ended
	Sep. 30, 2017
Postemployment Benefits [Abstract]
Employee Benefits	12. EMPLOYEE BENEFITS Employee Stock Ownership Plan (“ESOP”) The Company created an ESOP for the benefit of employees who meet the eligibility requirements, which include having completed one year of service with the Company or its subsidiary and attained age 21. The ESOP trust acquired 1,358,472 shares of the Company’s stock from proceeds from a loan with the Company. The Company makes cash contributions to the ESOP on an annual basis sufficient to enable the ESOP to make the required loan payments. Cash dividends paid on allocated shares are distributed to participants and cash dividends paid on unallocated shares are used to repay the outstanding debt of the ESOP. The ESOP trust’s outstanding loan bears interest at 3.75 percent and requires an annual payment of principal and interest of $718,000 through December of 2036. The Company’s ESOP, which is internally leveraged, does not report the loans receivable extended to the ESOP as assets and does not report the ESOP debt due to the Company. As the debt is repaid, shares are released from the collateral and allocated to qualified employees based on the proportion of payments made during the year to the remaining amount of payments due on the loan through maturity. Accordingly, the shares pledged as collateral are reported as unallocated common stock held by the ESOP shares in the Consolidated Balance Sheet. As shares are released from collateral, the Company reports compensation expense equal to the current market price of the shares, and the shares become outstanding for earnings-per-share computations. The Company recognized ESOP expense of $686,000, $612,000, and $561,000 for the years ended September 30, 2017, 2016, and 2015, respectively. The following table presents the components of the ESOP shares: 2017 2016 Allocated shares 359,711 361,308 Shares committed to be released 33,962 33,962 Unreleased shares 871,686 916,968 Total ESOP shares 1,265,359 1,312,238 Fair value of unreleased shares (in thousands) $ 13,685 $ 12,682 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 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 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”). 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, incentive stock options and non-qualified stock options. 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 vested 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. During the years ended September 30, 2017, 2016, and 2015, the Company recorded $318,000, $193,000, and $95,000 of share-based compensation expense consisting of restricted stock expense. Expected future compensation expense relating to the restricted shares issued in 2015, at September 30, 2017 is $82,000 over the remaining vesting period of 1.0 year. Expected future compensation expense relating to the restricted shares issued in March 2016, at September 30, 2017 is $170,000 over the remaining vesting period of 2.0 years. Expected future compensation expense relating to the restricted shares issued in December 2016, at September 30, 2017 is $268,000 over the remaining vesting period of 3.0 years. Expected future compensation expense relating to the restricted shares (1,296) issued in March 2017, at September 30, 2017 is $16,000 over the remaining vesting period of 3.0 years. Expected future compensation expense relating to the restricted shares (2,000) issued in March 2017, at September 30, 2017 is $19,000 over the remaining vesting period of 1.0 year. The following is a summary of the Company’s stock option activity and related information for its option plan for the year ended September 30, 2017. Number of Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding, September 30, 2016 905,987 $ 12.35 1.67 $ 1,341 Granted - - - - Exercised 611,341 12.35 0.67 - Forfeited - - - - Outstanding, September 30, 2017 294,646 12.35 0.67 987 Exercisable at year-end 294,646 12.35 0.67 987 The following is a summary of the status of the Company’s nonvested restricted stock as of September 30, 2017, and changes therein during the year 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 (21,175 ) 13.62 Forfeited - - Nonvested at September 30, 2017 34,692 $ 14.89 Defined Benefit Plan The Bank sponsors a trusteed, noncontributory defined benefit pension plan covering substantially all employees and officers. The plan calls for benefits to be paid to eligible employees at retirement based primarily upon years of service with the Bank and compensation rates near retirement. The Bank’s funding policy is to make annual contributions, if needed, based upon the funding formula developed by the plan’s actuary. In February 2017, the Bank amended the defined benefit pension plan to provide that no additional participants would enter the plan and no additional benefits would accrue beyond February 28, 2017. This curtailment resulted in a $4,579,000 reduction to the projected benefit obligation as well as a reduction in accumulated other comprehensive loss of $3,022,000 in 2017. The following table sets forth the change in plan assets and benefit obligation at September 30 (in thousands): 2017 2016 Change in benefit projected obligation: Projected benefit obligation at beginning of year $ 25,470 $ 22,093 Service cost 516 987 Interest cost 859 972 Actuarial (gains) losses (2,857 ) 2,012 Curtailment (Plan Freeze) (4,579 ) - Benefits paid (811 ) (594 ) Projected benefit obligation at end of year 18,598 25,470 Change in plan assets: Fair value of plan assets at beginning of year 19,188 17,507 Actual return on plan assets 1,986 1,644 Contributions - 631 Benefits paid (811 ) (594 ) Fair value of plan assets at end of year 20,363 19,188 Funded status $ 1,765 $ (6,282 ) Amounts not yet recognized as a component of net periodic pension cost (in thousands): 2017 2016 2015 Amounts recognized in accumulated other comprehensive loss consist of: Net loss $ 953 $ 9,216 $ 8,068 The accumulated benefit obligation for the defined benefit pension plan was $18,598,000 and $20,361,000 at September 30, 2017 and 2016, respectively. The following table comprises the components of net periodic benefit cost for the years ended September 30 (in thousands): 2017 2016 2015 Service cost $ 516 $ 987 $ 873 Interest cost 859 972 826 Expected return on plan assets (1,385 ) (1,244 ) (1,233 ) Amortization of unrecognized loss 226 463 241 Net periodic benefit cost $ 216 $ 1,178 $ 707 The estimated net loss for the defined benefit pension plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $0. Weighted-average assumptions used to determine benefit obligations: 2017 2016 Discount rate 3.85 % 3.70 % Rate of compensation increase N/A 3.00 Weighted-average assumptions used to determine net periodic benefit cost for the years ended: 2017 2016 2015 Discount rate 4.10 % 4.45 % 4.45 % Expected long-term return on plan assets 7.00 7.00 7.00 Rate of compensation increase N/A 4.00 4.00 The expected long-term rate of return was estimated using market benchmarks by which the plan assets would outperform the market in the future, based on historical experience adjusted for changes in asset allocation and expectations for overall lower future returns on similar investments compared with past periods. Plan Assets The following tables set forth by level, within the fair value hierarchy, the plan’s financial assets at fair value as of September 30, 2017 and 2016 (in thousands): September 30, 2017 Level I Level II Level III Total Assets: Investment in collective trusts Fixed income $ - $ 7,999 $ - $ 7,999 Equity - 12,353 - 12,353 Investment in short-term investments - 11 - 11 Total assets at fair value $ - $ 20,363 $ - $ 20,363 September 30, 2016 Level I Level II Level III Total Assets: Investment in collective trusts Fixed income $ - $ 7,654 $ - $ 7,654 Equity - 11,502 - 11,502 Investment in short-term investments - 32 - 32 Total assets at fair value $ - $ 19,188 $ - $ 19,188 Investments in collective trusts and short-term investments are valued at the net asset value of shares held by the plan. The Bank’s defined benefit pension plan weighted-average asset allocations at September 30, 2017 and 2016 by asset category, are as follows: September 30, Asset Category 2017 2016 Fixed income securities 39.3 % 39.9 % Equity securities 60.7 59.9 Other 0.0 0.2 Total 100.0 % 100.0 % The Bank believes that the plan’s risk and liquidity position are, in large part, a function of the asset class mix. The Bank desires to utilize a portfolio mix that results in a balanced investment strategy. Three asset classes are outlined, as above. The target allocations of these classes are as follows: equity securities, 65 percent, and cash and fixed income securities, 35 percent. Cash Flows The Bank expects to contribute $0 to its pension plan in 2017. Estimated future benefit payments, which reflect expected future service, as appropriate, are as follows (in thousands): 2018 $ 1,109 2019 851 2020 2,949 2021 3,181 2022 556 2023-2027 5,691 401(k) Plan The Bank also has a savings plan qualified under Section 401(k) of the Internal Revenue Code, which covers substantially all employees over 21 years of age. Employees can contribute to the plan, but are not required to. Employer contributions were reinstated in March 2017. Employer contributions are allocated based on employee contribution levels. The expense related to the plan for the year ended September 30, 2017 was $251,000. Supplemental Executive Retirement Plan The Bank maintains a salary continuation agreement with certain executives of the Bank, which provides for benefits upon retirement to be paid to the executive for no less than 192 months, unless the executive elects to receive the present value of the payments as a lump sum. The Bank has recorded accruals of $1.6 million and $1.2 million at September 30, 2017 and 2016, respectively which represent the estimated present value (using a discount rate of 6.00 percent) of the benefits earned under this agreement. There was $447,000 and $413,000 in expense related to the supplemental executive retirement plan for the years ended September 30, 2017 and 2016, respectively. There was no expense related to the supplemental executive retirement plan for the year ended September 30, 2015.

Regulatory Restrictions

Regulatory Restrictions	12 Months Ended
	Sep. 30, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Restrictions	13. REGULATORY RESTRICTIONS Reserve Requirements The Bank is required to maintain reserve funds in cash or in deposit with the Federal Reserve Bank. The required reserve at September 30, 2017 and 2016, was $15,228,000 and $10,523,000, respectively. Dividend Restrictions Federal banking laws, regulations, and policies limit the Bank’s ability to pay dividends to the Company. Dividends may be declared and paid by the Bank only out of net earnings for the then current year. A dividend may not be declared or paid if it would impair the general reserves of the Bank as required to be maintained under the Pennsylvania Banking.

Regulatory Capital Requirements

Regulatory Capital Requirements	12 Months Ended
	Sep. 30, 2017
Banking And Thrift [Abstract]
Regulatory Capital Requirements	14. REGULATORY CAPITAL REQUIREMENTS Federal regulations require the Bank and the Company to maintain certain minimum amounts of capital. Specifically, the Bank and the Company are required to maintain certain minimum dollar amounts and ratios of Total and Tier 1 capital to risk-weighted assets, of Tier 1 capital to average total assets, and common equity Tier 1 capital to risk-weighted assets. In addition to the capital requirements, the Federal Deposit Insurance Corporation Improvement Act (“FDICIA”) established five capital categories ranging from “well capitalized” to “critically undercapitalized.” Should any institution fail to meet the requirements to be considered “adequately capitalized,” it would become subject to a series of increasingly restrictive regulatory actions. Management believes that, as of September 30, 2017, the Bank met all capital adequacy requirements to which it is subject. In July of 2013 the respective U.S. federal banking agencies issued final rules implementing Basel III and the Dodd-Frank Act capital requirements to be fully-phased in on a global basis on January 1, 2019. The new regulations established a new tangible common equity capital requirement, increase the minimum requirement for the current Tier 1 risk-weighted asset (“RWA”) ratio, phase out certain kinds of tangibles treated as capital and certain types of instruments and change the risk weightings of certain assets used to determine requirement capital ratios. Provisions of the Dodd-Frank Act generally require these capital rules to apply to bank holding companies and their subsidiaries. The new common equity Tier 1 capital component requires capital of the highest quality-predominantly composed of retained earnings and common stock instruments. For community banks, such as ESSA Bank & Trust, a common equity Tier 1 capital ratio of 4.5% became effective on January 1, 2015. The new capital rules also increased the current minimum of Tier 1 capital ratio from 4.0% to 6.0% beginning on January 1, 2015. In addition, in order to make capital distributions and pay discretionary bonuses to executive officers without restriction, an institution must also maintain greater than 2.5% in common equity attributable to a capital conservation buffer to be phased in from January 1, 2016 until January 1, 2019. The new rules also increase the risk weights for several categories of assets, including an increase from 100% to 150% for certain acquisition, development and construction loans and more than 90-day past due exposures. The new capital rules maintain the general structure of the prompt corrective action rules, but incorporate the new common equity Tier 1 capital requirement and the increased Tier 1 RWA requirement into the prompt corrective action framework. Bank holding companies are generally subject to statutory capital requirements, which were implemented by certain of the new capital regulations described above that became effective on January 1, 2015. However, the Small Banking Holding Company Policy Statement exempts certain small bank holding companies like the Company from those requirements provided that they meet certain conditions. As of September 30, 2017 and 2016, the FDIC categorized the Bank and the Federal Reserve categorized the Company as well capitalized under the regulatory framework for prompt corrective action. To be classified as a well-capitalized financial institution, Total risk-based, Tier 1 risk-based, common equity Tier 1 capital and Tier 1 leverage capital must be at least 10 percent, 8 percent, 6.5 percent, and 5 percent, respectively. There have been no conditions or events since the notification that management believes have changed the Bank’s or the Company’s category. The following table reconciles the Bank’s capital under U.S. generally accepted accounting principles to regulatory capital (in thousands): 2017 2016 Total stockholders’ equity $ 175,127 $ 166,327 Accumulated other comprehensive loss 754 1,832 Goodwill and certain other intangible assets (15,276 ) (15,294 ) Tier I, common equity and core capital 160,605 152,865 Allowance for loan losses and off-balance sheet commitments 9,720 9,411 Total risk-based capital $ 170,325 $ 162,276 The Bank’s actual capital ratios are presented in the following table (in thousands): 2017 2016 Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Actual $ 170,325 14.0 % $ 162,276 13.7 % For capital adequacy purposes 97,458 8.0 94,548 8.0 To be well capitalized 121,822 10.0 118,186 10.0 Tier 1 capital (to risk-weighted assets) Actual $ 160,605 13.2 % $ 152,865 12.9 % For capital adequacy purposes 73,093 6.0 70,911 6.0 To be well capitalized 97,458 8.0 94,548 8.0 Common equity tier 1 capital (to risk-weighted assets) Actual $ 160,605 13.2 % $ 152,865 12.9 % For capital adequacy purposes 54,820 4.5 53,183 4.5 To be well capitalized 79,184 6.5 76,821 6.5 Tier 1 capital (to adjusted assets) Actual $ 160,605 9.2 % $ 152,865 8.8 % For capital adequacy purposes 69,878 4.0 69,811 4.0 To be well capitalized 87,247 5.0 87,264 5.0 The Company’s ratios do not differ significantly from the Bank’s ratios presented above.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	15. FAIR VALUE MEASUREMENTS 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. The following tables present information about the Company’s securities, real estate owned, and impaired loans measured at fair value as of September 30, 2017 and 2016, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value (in thousands): September 30, 2017 Level I Level II Level III Total Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage-backed securities $ - $ 233,823 $ - $ 233,823 Obligations of states and political subdivisions - 65,358 - 65,358 U.S. government agency securities - 18,671 - 18,671 Corporate obligations - 41,518 7,224 48,742 Other debt securities - 23,833 - 23,833 Equity securities - financial services 25 - - 25 Total securities 25 383,203 7,224 390,452 Derivatives and hedging activities: - 1,215 - 1,215 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate owned - - 1,424 1,424 Impaired loans - - 15,231 15,231 Mortgage servicing rights - - 232 232 September 30, 2016 Level I Level II Level III Total Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage-backed securities $ - $ 219,162 $ - $ 219,162 Obligations of states and political subdivisions - 73,690 - 73,690 U.S. government agency securities - 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 securities 25 382,900 7,485 390,410 Derivatives and hedging activities: - 453 - 453 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate owned - - 2,659 2,659 Impaired loans - - 22,218 22,218 Mortgage servicing rights - - 398 398 The following table presents a summary of changes in the fair value of the Company’s Level III investments for the years ended September 30, 2017 and 2016 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) September 30, 2017 September 30, 2016 Beginning balance $ 7,485 $ 4,211 Purchases, sales, issuances, settlements, net - 3,292 Total unrealized gain: Included in earnings - - Included in other comprehensive income 4 (18 ) Transfers into Level III 750 - Transfers out of Level III (1,015 ) - $ 7,224 $ 7,485 One investment security totaling $750,000 was transferred into Level III investments for the year ended September 30, 2017 because market pricing is no longer available. One investment security for $1.0 million was transferred out of Level III investments for the year ended September 30, 2017 because market pricing is available and it no longer meets the definition of a Level III investment. No securities were transferred into or out of Level III investments for the year ended September 30, 2016. Financial assets and liabilities must be identified as having been valued according to a specified level of input, I, II, or III. Level I 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 II inputs utilize inputs other than quoted prices included in Level I that are observable for the asset, either directly or indirectly. Level II 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 III 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 II 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 I inputs are limited to actively traded equity securities whose market price is readily available from the New York Stock Exchange or the Nasdaq Stock Market. The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level III inputs to determine fair value (dollars in thousands): Quantitative Information About Level III Fair Value Measurements Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted September 30, 2017 Impaired loans $ 15,231 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 57% (24.0%) Foreclosed real estate owned 1,424 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 46% (22.1%) Mortgage servicing rights 232 Discounted cash flow Discount rate 11% (11%) Prepayment speeds 10% to 42% (15.9%) 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%) 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 III 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 is presented as a percent of the appraisal. (3) Includes qualitative adjustments by management and estimated liquidation expenses. Investment Securities Available for Sale The fair value of securities available for sale are determined by obtaining quoted market prices on nationally recognized securities exchanges (Level 1), or matrix pricing (Level 2), which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted prices. 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. Impaired Loans The Company has measured impairment on impaired loans generally based on the fair value of the loan’s collateral. Evaluating impaired loan collateral is based on Level II inputs utilizing outside appraisals. Those impaired loans for which management incorporates significant adjustments for sales costs and other discount assumptions regarding market conditions are considered Level III fair values. The fair value consists of the loan balances of $15.6 million less their valuation allowances of $345,000 at September 30, 2017. The fair value consists of the loan balances of $22.6 million less their valuation allowances of $347,000 at September 30, 2016. Foreclosed Real Estate Owned Foreclosed real estate owned 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 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. Derivatives 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. The fair value of the swap asset and liability is based on an external derivative model using data inputs as of the valuation date and classified Level 2.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	16. FAIR VALUE OF FINANCIAL INSTRUMENTS The fair values of the Company’s financial instruments are as follows (in thousands): September 30, 2017 Carrying Value Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 41,683 $ 41,683 $ - $ - $ 41,683 Certificates of deposit 500 - - 505 505 Investment and mortgage-backed securities available for sale 390,452 25 383,203 7,224 390,452 Loans receivable, net 1,236,681 - - 1,235,368 1,235,368 Accrued interest receivable 6,149 6,149 - - 6,149 Regulatory stock 13,832 13,832 - - 13,832 Mortgage servicing rights 232 - - 232 232 Derivatives 1,215 - 1,215 - 1,215 Bank-owned life insurance 37,626 37,626 - - 37,626 Financial liabilities: Deposits $ 1,274,861 $ 763,964 $ - $ 511,392 $ 1,275,356 Short-term borrowings 137,446 137,446 - - 137,446 Other borrowings 174,168 - - 174,107 174,107 Advances by borrowers for taxes and insurance 5,163 5,163 - - 5,163 Accrued interest payable 1,043 1,043 - - 1,043 September 30, 2016 Carrying Value 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 Company, 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. Derivatives Fair values of interest rate swap contracts are based on dealer quotes. 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. 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. 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. Certificates of Deposit, Loans Receivable, Deposits, Other Borrowings, and Mortgage Servicing Rights The fair values for loans and mortgage servicing rights are estimated by discounting contractual cash flows and adjusting for prepayment estimates. Discount rates are based upon rates generally charged for such loans with similar characteristics. Demand, savings, and money market deposit accounts are valued at the amount payable on demand as of year-end. Fair values for certificates of deposit, time deposits, and 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 deposits and 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. The contractual amounts of unfunded commitments are presented in Note 10.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	17. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The activity in accumulated other comprehensive income (loss) for the years ended September 30, 2017 and 2016, is as follows (in thousands): Accumulated Other Comprehensive Income (Loss) (1) 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 before reclassifications and pension plan curtailment 2,284 (4,684 ) 505 (1,895 ) Pension plan curtailment 3,022 - - 3,022 Amounts reclassified from accumulated other comprehensive loss 149 (195 ) (3 ) (49 ) Period change 5,455 (4,879 ) 502 1,078 Balance at September 30, 2017 $ (628 ) $ (927 ) $ 801 $ (754 ) Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ - $ (2,395 ) Other comprehensive income before reclassifications (1,064 ) 1,853 284 1,073 Amounts reclassified from accumulated other comprehensive loss 306 (831 ) 15 (510 ) Period change (758 ) 1,022 299 563 Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Balance at September 30, 2014 $ (3,228 ) $ 649 $ - $ (2,579 ) Other comprehensive income before reclassifications (2,256 ) 2,799 - 543 Amounts reclassified from accumulated other comprehensive loss 159 (518 ) - (359 ) Period change (2,097 ) 2,281 - 184 Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ - $ (2,395 ) (1) All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate approximating 34%. Details About Accumulated Other Comprehensive Loss Components Amount Reclassified from Accumulated Other Comprehensive Loss For the Year Ended September 30, (4) Affected Line Item in the Consolidated (in thousands) 2017 2016 2015 Statement of Income Securities available for sale (1) Net securities gains reclassified into earnings $ 295 $ 1,258 $ 786 Gain on sale of investments, net Related income tax expense (100 ) (427 ) (268 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 831 518 Defined benefit pension plan (2) Amortization of net (loss) gain and prior service costs (226 ) (463 ) (241 ) Compensation and employee benefits Related income tax expense 77 157 82 Income taxes Net effect on accumulated other comprehensive loss for the period (149 ) (306 ) (159 ) Derivatives and Hedging Activities (3) Interest expense, effective portion 5 (23 ) - Interest expense Related income tax expense (2 ) 8 - Income taxes Net effect on accumulated other comprehensive loss for the period 3 (15 ) - Total reclassifications for the period $ 49 $ 510 $ 359 (1) For additional details related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income (loss) see Note 3, “Investment Securities.” (2) Included in the computation of net periodic pension cost. See Note 12, “Employee Benefits” for additional detail. (3) For additional details related to derivative financial instruments see Note18, “Derivatives and Hedging Activities.” (4) Amounts in parenthesis indicate debits.

Derivative and Hedging Activiti

Derivative and Hedging Activities	12 Months Ended
	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	18. 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 September 30, 2017 and September 30, 2016, (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of September 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 $ 1,215 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 September 30, 2017, the Company had three interest rate swaps with a notional of $75 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 September 30, 2017 or 2016. Amounts reported in accumulated other comprehensive loss related to derivatives will be reclassified to interest income/expense as interest payments are made/received on the Company’s variable-rate assets/liabilities. During the year ended September 30, 2017, the Company had $5,000 of reclassifications to other non-interest income. During the next twelve months, the Company estimates that $0 will be reclassified as a decrease in interest expense. The table below presents the pre-tax net gains (losses) of the Company’s cash flow hedges for the period ended September 30, 2017 and 2016, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow Hedging Relationships Gain Recognized in OCI on Derivative (Effective Portion) Year Ended September 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended September 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Year Ended September 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 911 $ 430 Interest expense $ 5 $ (23 ) Other non-interest income $ - $ - Ending balance of OCI Total $ 911 $ 430 $ 5 $ (23 ) $ - $ - 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 / adequate 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 September 30, 2017 the termination value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $0. As of September 30, 2017, the Company has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral of $0 against its obligations under these agreements. If the Company had breached any of these provisions at September 30, 2017, it could have been required to settle its obligations under the agreements at the termination value.

Parent Company

Parent Company	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company	19 . PARENT COMPANY Condensed financial statements of ESSA Bancorp, Inc. are as follows (in thousands): CONDENSED BALANCE SHEET September 30, 2017 2016 ASSETS Cash and due from banks $ 5,034 $ 7,176 Investment securities available for sale 25 25 Investment in subsidiary 175,127 166,327 Premises and equipment, net 1,093 1,118 Other assets 1,577 1,792 TOTAL ASSETS $ 182,856 $ 176,438 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ 129 $ 94 Stockholders’ equity 182,727 176,344 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 182,856 $ 176,438 CONDENSED STATEMENT OF INCOME Year Ended September 30, 2017 2016 2015 INCOME Interest income $ 426 $ 383 $ 376 Dividends - 34,000 8,000 Total income 426 34,383 8,376 EXPENSES Professional fees 455 860 755 Other 51 50 64 Total expenses 506 910 819 Income (loss) before income tax expense (80 ) 33,473 7,557 Income tax benefit (27 ) (91 ) (118 ) Income (loss) before equity in undistributed net earnings of subsidiary (53 ) 33,564 7,675 Equity in undistributed net earnings of subsidiary 7,392 (25,837 ) 2,116 NET INCOME $ 7,339 $ 7,727 $ 9,791 COMPREHENSIVE INCOME $ 8,417 $ 8,290 $ 9,975 CONDENSED STATEMENT OF CASH FLOWS Year Ended September 30, 2017 2016 2015 OPERATING ACTIVITIES Net income $ 7,339 $ 7,727 $ 9,791 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed net earnings of subsidiary (7,391 ) 25,837 (2,116 ) Provision for depreciation 25 26 24 (Decrease) increase in accrued income taxes (34 ) (369 ) 40 (Increase) decrease in accrued interest receivable 1 (13 ) 8 Deferred federal income taxes (5 ) 3 (3 ) Other, net 974 (60 ) 458 Net cash provided by operating activities 909 33,151 8,202 INVESTING ACTIVITIES Certificate of deposit maturities - - 17 Acquisition and additional capitalization of subsidiary, net of cash acquired - (24,203 ) - Purchase of premises, equipment and software - - (41 ) Net cash used for investing activities - (24,203 ) (24 ) FINANCING ACTIVITIES Purchase of treasury stock shares - (301 ) (3,132 ) Proceeds from the exercise of stock options 779 18 - Dividends on common stock (3,830 ) (3,747 ) (3,546 ) Net cash used for financing activities (3,051 ) (4,030 ) (6,678 ) Increase (decrease) in cash (2,142 ) 4,918 1,500 CASH AT BEGINNING OF YEAR 7,176 2,258 758 CASH AT END OF YEAR $ 5,034 $ 7,176 $ 2,258

Selected Quarterly Data (Unaudi

Selected Quarterly Data (Unaudited)	12 Months Ended
	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Data (Unaudited)	20. SELECTED QUARTERLY DATA (UNAUDITED) Three Months Ended December 31, 2016 March 31, 2017 June 30, 2017 September 30, 2017 Total interest income $ 14,650 $ 14,379 $ 14,408 $ 14,881 Total interest expense 3,018 3,075 3,248 3,458 Net interest income 11,632 11,304 11,160 11,423 Provision for loan losses 750 750 750 1,100 Net interest income after provision for loan losses 10,882 10,554 10,410 10,323 Total noninterest income 1,857 1,784 2,120 2,438 Total noninterest expense 10,402 10,504 10,320 10,212 Income before income taxes 2,337 1,834 2,210 2,549 Income taxes expense 400 203 448 540 Net income $ 1,937 $ 1,631 $ 1,762 $ 2,009 Per share data: Net income Basic $ 0.18 $ 0.15 $ 0.16 $ 0.19 Diluted $ 0.18 $ 0.15 $ 0.16 $ 0.19 Average shares outstanding Basic 10,475,032 10,592,997 10,678,856 10,704,554 Diluted 10,604,072 10,691,960 10,743,008 10,766,159 Three Months Ended December 31, 2015 March 31, 2016 June 30, 2016 September 30, 2016 Total interest income $ 13,815 $ 15,159 $ 14,723 $ 14,669 Total interest expense 2,723 2,875 2,864 2,969 Net interest income 11,092 12,284 11,859 11,700 Provision for loan losses 600 600 600 750 Net interest income after provision for loan losses 10,492 11,684 11,259 10,950 Total noninterest income 1,817 2,277 2,296 2,393 Total noninterest expense 9,786 11,106 10,651 11,315 Income before income taxes 2,523 2,855 2,904 2,028 Income taxes benefit 566 726 792 499 Net income $ 1,957 $ 2,129 $ 2,112 $ 1,529 Per share data: Net income Basic $ 0.19 $ 0.20 $ 0.20 $ 0.15 Diluted $ 0.19 $ 0.20 $ 0.20 $ 0.14 Average shares outstanding Basic 10,364,425 10,385,154 10,426,304 10,456,404 Diluted 10,535,573 10,524,697 10,553,138 10,579,314

Acquisitions

Acquisitions	12 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions	21. ACQUISITIONS Acquisition of Eagle National Bancorp, Inc. On December 4, 2015, the Company closed on a merger transaction pursuant to which ESSA Bancorp, Inc. acquired ENB and its’ wholly owned subsidiary Eagle National Bank, in a cash transaction. The acquisition added five branch locations in the Philadelphia, Pennsylvania market, establishing ESSA’s presence in that market. Under the terms of the merger agreement, the Company acquired all of the outstanding shares of ENB, for a total cash purchase price of approximately $24.7 million. Eagle National Bank has been merged into ESSA Bank & Trust, with ESSA Bank & Trust as the surviving entity. The acquired assets and assumed liabilities were measured at estimated fair values. Management made significant estimates and exercised significant judgment in accounting for the acquisition. Management measured loan fair values based on loan file reviews (including borrower financial statements or tax returns), appraised collateral values, expected cash flows and historical loss factors of ENB. The Company also recorded an identifiable intangible asset representing the core deposit base of ENB based on management’s evaluation of the cost of such deposits relative to alternative funding sources. Management used market quotations to measure the fair value of investment securities. The business combination resulted in the acquisition of loans with and without evidence of credit quality deterioration. ENB’s loans were deemed impaired at the acquisition date if the Company did not expect to receive all contractually required cash flows due to concerns about credit quality. Such loans were fair valued and the difference between contractually required payments at the acquisition date and cash flows expected to be collected was recorded as a nonaccretable difference. At the acquisition date, the Company recorded $3.5 million of purchased credit-impaired loans subject to a nonaccretable difference of $2.0 million. The method of measuring carrying value of purchased loans differs from loans originated by the Company (originated loans), and as such, the Company identifies purchased loans and purchased loans with a credit quality discount and originated loans as amortized cost. ENB’s loans without evidence of credit deterioration were measured to fair valued by discounting both expected principal and interest cash flows using an observable discount rate for similar instruments that a market participant would consider in determining fair value. Additionally, consideration was given to management’s best estimates of default rates and payment speeds. At acquisition, ENB’s loan portfolio without evidence of deterioration totaled $120.7 million and was recorded at a fair value of $121.4 million. The following condensed statement reflects the values assigned to ENB net assets as of the acquisitions date (in thousands): Total purchase price $ 24,655 Net assets acquired: Cash 8,481 Investments available for sale 36,275 Loans receivable 123,380 Regulatory Stock 889 Premises and equipment, net 945 Intangible assets 1,491 Deferred tax assets 715 Other assets 2,174 Certificates of deposits (32,408 ) Deposits other than certificates of deposits (119,865 ) Other liabilities (964 ) 21,113 Goodwill resulting from ENB merger $ 3,542 Results of operations for ENB prior to the acquisition date are not included in the Consolidated Statement of Income for the period ended September 30, 2016. The following table presents financial information regarding the former Eagle National Bank operations included in the Consolidated Statement of Income from the date of acquisition through September 30, 2016 under column “Actual from acquisition date through September 30, 2016.” In addition, the following table presents unaudited pro forma information as if the acquisition of ENB had occurred on October 1, 2014 under the “Pro Forma” columns. The table below has been prepared for comparative purposes only and is not necessarily indicative of the actual results that would have been attained had the acquisition occurred as of the beginning of the periods presented, nor is it indicative of future results. Furthermore, the unaudited pro forma information does not reflect management’s estimate of any revenue-enhancing opportunities nor anticipated cost savings as a result of the integration and consolidation of the acquisition. Merger and acquisition integration costs and amortization of fair value adjustments net of the related income tax effects are included in the amounts below. Pro Formas Year Ended September 30, (unaudited) (in thousands, except per share data) 2017 2016 2015 Net interest income $ 45,519 $ 48,321 $ 50,238 Noninterest income 8,199 8,866 8,628 Net income 7,339 6,077 9,804 Pro forma earnings per share: Basic $ 0.69 $ 0.58 $ 0.94 Diluted $ 0.69 $ 0.58 $ 0.93

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	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, Lackawanna, Luzerne, Delaware, Chester, and Montgomery 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 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.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The accounting principles followed by the Company and its subsidiary and the methods of applying these principles conform to U.S. generally accepted accounting principles and to general practice within the banking industry. In preparing the consolidated financial statements, the Company 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.
Securities	Securities The Company determines the appropriate classification of debt securities at the time of purchase and reevaluates such designation as of each balance sheet date. Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time but not necessarily to maturity. Any decision to sell a security classified as available for sale would be based on various factors, including significant movement in interest rates, changes in maturity mix of the Company’s assets and liabilities, liquidity needs, regulatory capital considerations, and other similar factors. Securities available for sale are carried at fair value. Unrealized gains and losses are reported in other comprehensive income (loss), net of the related deferred tax effects. Realized gains or losses, determined on the basis of the cost of the specific securities sold, are included in earnings. Premiums and discounts are recognized in interest income using the interest method over the period to maturity. Declines in the fair value of available-for-sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, the Company considers: (1) the length of time and the extent to which the fair value has been less than cost; (2) the financial condition and near-term prospects of the issuer; and (3) the Company’s intent to sell the security or whether it’s more likely than not that the Company would be required to sell the security before its anticipated recovery in market value.
Loans Receivable	Loans Receivable Loans receivable that the Company has the intent and ability to hold for the foreseeable future or until maturity or payoff are stated at their outstanding unpaid principal balances, net of an allowance for loan losses and any deferred fees and costs. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the yield (interest income) of the related loans. The Company is generally amortizing these amounts over the contractual life of the loan. The accrual of interest is generally discontinued when the contractual payment of principal or interest has become 90 days past due or the Company has serious doubts about further collectability of principal or interest, even though the loan is currently performing. A loan may remain on accrual status if it is in the process of collection and is either guaranteed or well secured. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on nonaccrual loans generally is either applied against principal or reported as interest income, according to the Company’s judgment as to the collectability of principal. Generally, loans are restored to accrual status when the obligation is brought current and has performed in accordance with the contractual terms for a reasonable period of time and the ultimate collectability of the total contractual principal and interest is no longer in doubt.
Loans Acquired	Loans Acquired Loans acquired including loans that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payments receivable, are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. Loans are evaluated individually to determine if there is evidence of deterioration of credit quality since origination. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “non-accretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining estimated life. Decreases in expected cash flows are recognized immediately as impairment. Any valuation allowances on these impaired loans reflect only losses incurred after acquisition. For purchased loans acquired that are not deemed impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Loans are aggregated and accounted for as a pool of loans if the loans being aggregated have common risk characteristics. Subsequent to the purchase date, the methods utilized to estimate the required allowance for credit losses for these loans is similar to originated loans; however, the Company records a provision for loan losses only when the required allowance exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the life of the loans.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is established through provisions for loan losses charged against income. Loans deemed to be uncollectible are charged against the allowance for loan losses, and subsequent recoveries, if any, are credited to the allowance. The allowance for loan losses is maintained at a level by management which represents the evaluation of known and inherent risks in the loan portfolio at the Consolidated Balance Sheet date. Management’s periodic evaluation of the adequacy of the allowance is based on the Company’s past loan loss experience, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, the estimated value of any underlying collateral, composition of the loan portfolio, current economic conditions, and other relevant factors. This evaluation is inherently subjective, since it requires material estimates that may be susceptible to significant change, including the amounts and timing of future cash flows expected to be received on impaired loans. The allowance consists of specific and general components. The specific component relates to loans that are classified as impaired. For such loans an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers nonclassified loans and is based on historical loss experience adjusted for qualitative factors. All loans are considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement and all loan types are considered impaired if the loan is restructured in a troubled debt restructuring. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is 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 classified as a troubled debt restructuring or is more than 180 days past due. A loan is considered to be a troubled debt restructuring (“TDR”) loan when the Company grants a concession to the borrower because of the borrower’s financial condition that it would not otherwise consider. 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 may be removed from the TDR status after one year of performance.
Regulatory Stock	Regulatory Stock Regulatory stock consists of Federal Home Loan Bank (“FHLB”) of Pittsburgh stock and Atlantic Community Bankers Bank stock. Regulatory stock is carried at cost. The Company is a member of the Federal Home Loan Bank System and holds stock in the Federal Home Loan Bank of Pittsburgh. As a member, the Company maintains an investment in the capital stock of the FHLB of Pittsburgh in an amount not less than 10 basis points of the outstanding member asset value plus 4.0 percent of its outstanding FHLB borrowings, as calculated throughout the year. The equity security is accounted for at cost and classified separately on the Consolidated Balance Sheet. The stock is bought from and sold to the FHLB based upon its $100 par value. The stock does not have a readily determinable fair value and as such is classified as restricted stock, carried at cost and evaluated by management. The stock’s value is determined by the ultimate recoverability of the par value rather than by recognizing temporary declines. The determination of whether the par value will ultimately be recovered is influenced by criteria such as the following: (a) The significance of the decline in net assets of the FHLB as compared to the capital stock amount and the length of time this situation has persisted; (b) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance; (c) the impact of legislative and regulatory changes on the customer base of the FHLB; and (d) the liquidity position of the FHLB. With consideration given to these factors, management concluded that the stock was not impaired at September 30, 2017.
Loan Servicing	Loan Servicing Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. Servicing assets are evaluated for impairment based upon a third-party appraisal. Fair value is determined using prices for similar assets with similar characteristics, when available, or based upon discounted cash flows using market-based assumptions. Impairment is recognized through a valuation allowance to the extent that fair value is less than the capitalized amount. The Company’s loan servicing assets at September 30, 2017 and 2016, were not impaired. Total servicing assets included in other assets as of September 30, 2017 and 2016, were $232,000 and $398,000, respectively.
Premises and Equipment	Premises and Equipment Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the useful lives of the related assets, which range from 10 to 40 years for buildings, land improvements, and leasehold improvements and 3 to 7 years for furniture, fixtures, and equipment. Expenditures for maintenance and repairs are charged to operations as incurred. Costs of major additions and improvements are capitalized.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities The Company records all derivatives on the consolidated balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting.
Bank-Owned Life Insurance ("BOLI")	Bank-Owned Life Insurance (“BOLI”) The Company owns insurance on the lives of a certain group of key employees. The policies were purchased to help offset the increase in the costs of various fringe benefit plans, including healthcare. The cash surrender value of these policies is included as an asset on the Consolidated Balance Sheet, and any increase in cash surrender value is recorded as noninterest income on the Consolidated Statement of Income. In the event of the death of an insured individual under these policies, the Company would receive a death benefit which would be recorded as noninterest income.
Foreclosed Real Estate	Foreclosed Real Estate Real estate owned acquired in settlement of foreclosed loans is carried at fair value minus estimated costs to sell. At acquisition of real estate acquired in settlement of foreclosed loans, the excess of the remaining loan balance over the asset’s estimated fair value less cost to sell is charged off against the allowance for loan losses. Subsequent declines in the asset’s value are recognized as noninterest expense in the Consolidated Statement of Income. Operating expenses of such properties, net of related income, are expensed in the period incurred.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill is not amortized, but it is tested at least annually for impairment in the fourth quarter, or more frequently if indicators of impairment are present. If the estimated current fair value of a reporting unit exceeds its carrying value, no additional testing is required and an impairment loss is not recorded. The Company uses market capitalization and multiples of tangible book value methods to determine the estimated current fair value of its reporting unit. Based on this analysis, no impairment was recorded in 2017 or 2016. The other intangible assets are assigned useful lives, which are amortized on an accelerated basis over their weighted-average lives. The Company periodically reviews intangible assets for impairment as events or changes in circumstances indicate that the carrying amount of such asset may not be recoverable. Based on these reviews, no impairment was recorded in 2017 and 2016. The following tables provide information for the carrying amount of goodwill and intangible assets (dollars in thousands). Goodwill 2017 2016 Balance at beginning of year $ 13,801 $ 10,259 Goodwill acquired - 3,542 Balance at end of year $ 13,801 $ 13,801 Intangible assets 2017 2016 Balance at beginning of year $ 2,487 $ 1,759 Intangible assets acquired - 1,491 Amortization (643 ) (763 ) Balance at end of year $ 1,844 $ 2,487 Amortizable intangible assets were composed of the following: September 30, 2017 2016 Gross Amount Accumulated Amortization (dollars in thousands) Customer data $ 4,787 $ 2,943 $ 2,300 2017 2016 Aggregate amortization expense: As of the years ended September 30 $ 643 $ 763 Estimated future amortization expense (dollars in thousands): 2018 $ 469 2019 309 2020 275 2021 272 2022 239 2023 190 2024 90 $ 1,844
Employee Benefit Plans	Employee Benefit Plans The Bank maintains a noncontributory, defined benefit pension plan for all employees who have met age and length of service requirements. The Bank also maintains a defined contribution Section 401(k) plan covering eligible employees. The Company created an ESOP for the benefit of employees who meet certain eligibility requirements. The Company makes cash contributions to the ESOP on an annual basis. The Company maintains an equity incentive plan to provide for issuance or granting of shares of common stock for stock options or restricted stock. The Company has recorded stock-based employee compensation cost using the fair value method as allowed under generally accepted accounting principles. Management estimated the fair values of all option grants using the Black-Scholes option-pricing model. Management estimated the expected life of the options using the simplified method as allowed under generally accepted accounting principles. The risk-free rate was determined utilizing the treasury yield for the expected life of the option contract.
Advertising Costs	Advertising Costs In accordance with generally accepted accounting principles, the Company expenses all advertising expenditures incurred.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company; (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets; and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Income Taxes	Income Taxes Deferred tax assets and liabilities are reflected based on the differences between the financial statement and the income tax basis of assets and liabilities using the enacted marginal tax rates. Deferred income tax expense and benefit are based on the changes in the deferred tax assets or liabilities from period to period. Deferred tax assets and liabilities are reflected at currently enacted income tax rates applicable to the period in which such items are expected to be realized or settled. As changes in tax rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. The Company files a consolidated federal income tax return and individual state income tax returns. The Company prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Benefits from tax positions should be recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold should be recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold should be derecognized in the first subsequent financial reporting period in which that threshold is no longer met.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company has defined cash and cash equivalents as cash and due from banks and interest-bearing deposits with other institutions with original maturities of less than 90 days.
Earnings Per Share	Earnings Per Share The Company provides dual presentation of basic and diluted earnings per share. Basic earnings per share are calculated utilizing net income as reported as the numerator and average shares outstanding as the denominator. The computation of diluted earnings per share differs in that the dilutive effects of any options are adjusted for in the denominator.
Comprehensive Income (Loss)	Comprehensive Income (Loss) The Company is required to present comprehensive income (loss) and its components in a full set of general-purpose financial statements for all periods presented. Other comprehensive income (loss) is composed of net unrealized holding gains or losses on its available-for-sale investment and mortgage-backed securities portfolio and derivative instruments, and changes in unrecognized pension cost.
Fair Value Measurements	Fair Value Measurements The Company groups assets and liabilities carried at fair value in three levels, based on the markets in which the assets are traded and the reliability of the assumptions used to determine fair value. These levels are: • Level I – Valuation is based upon quoted prices for identical instruments traded in active markets. • Level II – Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. • Level III – Valuation is generated from model-based techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset. The Company determines fair value based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. It is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements, in accordance with the fair value hierarchy in generally accepted accounting principles. Fair value measurements for most of the Company’s assets are obtained from independent pricing services that we have engaged for this purpose. When available, the Company, or the Company’s independent pricing service, use quoted market prices to measure fair value. If market prices are not available, fair value measurement is based upon models that incorporate available trade, bid, and other market information. Subsequently, all of the Company’s financial instruments use either of the foregoing methodologies to determine fair value adjustments recorded to our financial statements. In certain cases, however, when market observable inputs for model-based valuation techniques may not be readily available, we are required to make judgments about assumptions market participants would use in estimating the fair value of financial instruments. The degree of management judgment involved in determining the fair value of a financial instrument is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not fully available, management judgment is necessary to estimate fair value. In addition, changes in the market conditions may reduce the availability of quoted prices or observable data. When market data is not available, we use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, that could significantly affect the results of current or future valuations.
Reclassification of Comparative Amounts	Reclassification of Comparative Amounts Certain items previously reported have been reclassified to conform to the current year’s reporting format. Such reclassifications did not affect consolidated net income or consolidated stockholders’ equity.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (a new revenue recognition standard) Revenue from Contracts with Customers (Topic 606) 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 March 2016, the FASB issued ASU 2016-09, Compensation – Stock Compensation (Topic 718) 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 In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20). In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715) In March 2017, the FASB issued ASU 2017 - , Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20). inning after 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 In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 850) In September 2017, the FASB issued ASU 2017-13, Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842 Amendments to SEC Paragraphs Pursuant to the Staff Announcement at the July 20, 2017 EITF Meeting and Rescission of Prior SEC Staff Announcements and Observer Comments. Revenue from Contracts with Customers Leases

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Carrying Amount of Goodwill and Intangible Assets	The following tables provide information for the carrying amount of goodwill and intangible assets (dollars in thousands). Goodwill 2017 2016 Balance at beginning of year $ 13,801 $ 10,259 Goodwill acquired - 3,542 Balance at end of year $ 13,801 $ 13,801 Intangible assets 2017 2016 Balance at beginning of year $ 2,487 $ 1,759 Intangible assets acquired - 1,491 Amortization (643 ) (763 ) Balance at end of year $ 1,844 $ 2,487
Amortizable Intangible Assets	Amortizable intangible assets were composed of the following: September 30, 2017 2016 Gross Amount Accumulated Amortization (dollars in thousands) Customer data $ 4,787 $ 2,943 $ 2,300 2017 2016 Aggregate amortization expense: As of the years ended September 30 $ 643 $ 763
Estimated Future Amortization Expense	Estimated future amortization expense (dollars in thousands): 2018 $ 469 2019 309 2020 275 2021 272 2022 239 2023 190 2024 90 $ 1,844

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Sep. 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 years ended September 30, 2017, 2016, and 2015. 2017 2016 2015 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,606,116 ) (6,769,423 ) (6,682,911 ) Average unearned ESOP shares (882,617 ) (927,908 ) (973,168 ) Average unearned nonvested shares (42,629 ) (37,276 ) (22,560 ) Weighted-average common shares and common stock equivalents used to calculate basic earnings per share 10,601,733 10,398,488 10,454,456 Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share - - 9,787 Additional common stock equivalents (stock options) used to calculate diluted earnings per share 61,724 120,580 78,887 Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share 10,663,457 10,519,068 10,543,130

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Sep. 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): 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for sale Fannie Mae $ 119,333 $ 207 $ (1,203 ) $ 118,337 Freddie Mac 98,668 177 (808 ) 98,037 Governmental National Mortgage Association securities 17,609 43 (203 ) 17,449 Total mortgage-backed securities 235,610 427 (2,214 ) 233,823 Obligations of states and political subdivisions 64,382 1,522 (546 ) 65,358 U.S. government agency securities 18,615 61 (5 ) 18,671 Corporate obligations 49,025 335 (618 ) 48,742 Other debt securities 24,200 47 (414 ) 23,833 Total debt securities 391,832 2,392 (3,797 ) 390,427 Equity securities - financial services 25 - - 25 Total $ 391,857 $ 2,392 $ (3,797 ) $ 390,452 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 securities 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 September 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 $ 14,530 $ 14,536 Due after one year through five years 34,229 34,504 Due after five years through ten years 89,022 88,947 Due after ten years 254,051 252,440 Total $ 391,832 $ 390,427
Schedule of Gross Unrealized Losses and Fair Value	The following table shows the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands): 2017 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 55 $ 61,852 $ (558 ) $ 20,679 $ (645 ) $ 82,531 $ (1,203 ) Freddie Mac 39 38,913 (354 ) 16,427 (454 ) 55,340 (808 ) Governmental National Mortgage Association securities 11 6,669 (41 ) 6,903 (162 ) 13,572 (203 ) Obligations of states and political subdivisions 25 10,944 (59 ) 17,425 (487 ) 28,369 (546 ) U.S. government agency securities 3 8,995 (5 ) - - 8,995 (5 ) Corporate obligations 22 15,119 (104 ) 8,032 (514 ) 23,151 (618 ) Other debt securities 19 7,141 (104 ) 13,806 (310 ) 20,947 (414 ) Total 174 $ 149,633 $ (1,225 ) $ 83,272 $ (2,572 ) $ 232,905 $ (3,797 ) 2016 Less than Twelve Months Twelve Months or Greater Total Number of Securities Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 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 securities 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 (Tables)

Loans Receivable (Tables)	12 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable consist of the following (in thousands): 2017 2016 Real estate loans: Residential $ 586,708 $ 596,645 Construction 3,097 1,733 Commercial 318,323 288,447 Commercial 44,129 39,978 Obligations of states and political subdivisions 58,079 56,923 Home equity loans and lines of credit 46,219 48,163 Auto loans 186,646 193,078 Other 2,845 3,302 1,246,046 1,228,269 Less allowance for loan losses 9,365 9,056 Net loans $ 1,236,681 $ 1,219,213
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 periods ended September 30, 2017 and 2016 (in thousands): September 30, September 30, Balance at beginning of period $ 478 $ 258 Acquisition of ENB - 240 Reclassification and other 215 163 Accretion (222 ) (183 ) Balance at end of period $ 471 $ 478
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): September 30, 2017 September 30, 2016 Acquired Loans with Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 5,490 $ 6,893 Carrying amount 4,388 5,563
Schedule of Loans Evaluated for Impairment	The following table shows the amount of loans in each category that was 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 September 30, 2017 Real estate loans: Residential $ 586,708 $ 6,202 $ - $ 580,506 Construction 3,097 - - 3,097 Commercial 318,323 7,211 3,775 307,337 Commercial 44,129 1,385 283 42,461 Obligations of states and political subdivisions 58,079 - - 58,079 Home equity loans and lines of credit 46,219 176 330 45,713 Auto Loans 186,646 572 - 186,074 Other 2,845 30 - 2,815 Total $ 1,246,046 $ 15,576 $ 4,388 $ 1,226,082 Total Loans Individually Evaluated for 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 subdivisions 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
Schedule of Investment and Unpaid Principal Balances for Impaired Loans	The following table includes the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable, excluding purchased impaired credit loans. Also presented are 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). Recorded Investment Unpaid Principal Balance Associated Allowance Average Recorded Investment Interest Income Recognized September 30, 2017 With no specific allowance recorded: Real estate loans: Residential $ 4,392 $ 5,730 $ - $ 5,373 $ 39 Construction - - - - - Commercial 7,191 9,396 - 8,816 297 Commercial 1,385 1,575 - 1,579 120 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 176 258 - 231 - Auto loans 123 237 - 116 1 Other 30 36 - 8 - Subtotal 13,297 17,232 - 16,123 457 With an allowance recorded: Real estate loans: Residential 1,810 2,264 154 1,814 - Construction - - - - - Commercial 20 1,193 19 360 - Commercial - - - 30 - Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit - - - 3 - Auto loans 449 468 172 263 7 Other - - - - - Subtotal 2,279 3,925 345 2,470 7 Total: Real estate loans: Residential 6,202 7,994 154 7,187 39 Construction - - - - - Commercial 7,211 10,589 19 9,176 297 Commercial 1,385 1,575 - 1,609 120 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 176 258 - 234 - Auto loans 572 705 172 379 8 Other 30 36 - 8 - Total $ 15,576 $ 21,157 $ 345 $ 18,593 $ 464 Recorded Investment Unpaid Principal Balance Associated Allowance Average Recorded Investment Interest Income Recognized September 30, 2016 With no specific allowance recorded: Real estate loans: Residential $ 6,721 $ 9,016 $ - $ 7,560 $ 82 Construction - - - - - Commercial 10,939 12,928 - 12,490 496 Commercial 1,698 1,725 - 1,556 124 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 361 432 - 553 2 Auto loans 253 365 - 295 2 Other 22 22 - 6 - Subtotal 19,994 24,488 - 22,460 706 With an allowance recorded: Real estate loans: Residential 2,000 2,151 198 2,314 12 Construction - - - - - Commercial 298 303 36 1,118 - Commercial - - - 2 - Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit - - - 90 - Auto loans 273 273 113 241 10 Other - - - - - Subtotal 2,571 2,727 347 3,765 22 Total: Real estate loans: Residential 8,721 11,167 198 9,874 94 Construction - - - - - Commercial 11,237 13,231 36 13,608 496 Commercial 1,698 1,725 - 1,558 124 Obligations of states and political subdivisions - - - - - Home equity loans and lines of credit 361 432 - 643 2 Auto loans 526 638 113 536 12 Other 22 22 - 6 - Total $ 22,565 $ 27,215 $ 347 $ 26,225 $ 728
Classes of the Loan Portfolio, Internal Risk Rating System	The following table presents the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful within the internal risk rating system as of September 30, 2017 and 2016 (in thousands): Pass Special Mention Substandard Doubtful Total September 30, 2017 Commercial real estate loans $ 300,554 $ 3,376 $ 14,393 $ - $ 318,323 Commercial 40,996 32 3,101 - 44,129 Obligations of states and political subdivisions 58,079 - - - 58,079 Total $ 399,629 $ 3,408 $ 17,494 $ - $ 420,531 Pass Special Mention Substandard Doubtful 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 Nonperforming Loans	The following table presents the recorded investment in the loan classes based on payment activity as of September 30, 2017 and 2016 (in thousands): Performing Nonperforming Purchased Credit Impaired Total September 30, 2017 Real estate loans: Residential $ 580,116 $ 6,592 $ - $ 586,708 Construction 3,097 - - 3,097 Home equity loans and lines of credit 45,576 313 330 46,219 Auto Loans 185,910 736 - 186,646 Other 2,807 38 - 2,845 Total $ 817,506 $ 7,679 $ 330 $ 825,515 Performing Nonperforming Purchased Credit Impaired 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 table presents the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of September 30, 2017 and 2016 (in thousands): 31-60 Days 61-90 Days Greater than 90 Days Past Due and Total Purchased Credit Total Current Past Past Accruing Non­accrual Past Accruing Non­accrual Loans September 30, 2017 Real estate loans: Residential $ 577,034 $ 2,661 $ 421 $ - $ 6,592 $ 9,674 $ - $ - $ 586,708 Construction 3,097 - - - - - - - 3,097 Commercial 312,098 172 - - 2,278 2,450 612 3,163 318,323 Commercial 43,298 18 - - 530 548 - 283 44,129 Obligations of states and political subdivisions 58,079 - - - - - - - 58,079 Home equity loans and lines of credit 45,460 101 15 - 313 429 - 330 46,219 Auto loans 185,247 631 32 - 736 1,399 - - 186,646 Other 2,789 14 4 - 38 56 - - 2,845 Total $ 1,227,102 $ 3,597 $ 472 $ - $ 10,487 $ 14,556 $ 612 $ 3,776 $ 1,246,046 31-60 Days 61-90 Days Greater than 90 Days Past Due and Total Purchased Credit Total Current Past Past Accruing Non­accrual Past Accruing Non­accrual 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 the primary segments of the ALL, segregated into the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of September 30, 2017, 2016 and 2015 (in thousands): Real Estate Loans Obligations of States and Political Home Loans and Lines of Residential Construction Commercial Commercial Subdivisions Credit Auto Other Unallocated Total ALL balance at September 30, 2014 $ 5,573 $ 11 $ 663 $ 528 $ 163 $ 470 $ 459 $ 32 $ 735 $ 8,634 Charge-offs (1,359 ) - (65 ) (30 ) - (27 ) (596 ) (6 ) - (2,083 ) Recoveries 76 - 84 23 - 15 87 8 - 293 Provision 850 (4 ) (11 ) 172 26 3 1,620 (7 ) (574 ) 2,075 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 ALL balance at September 30, 2015 $ 5,140 $ 7 $ 671 $ 693 $ 189 $ 461 $ 1,570 $ 27 $ 161 $ 8,919 Charge-offs (1,040 ) - (266 ) (18 ) - (209 ) (1,262 ) - - (2,795 ) Recoveries 59 - 52 7 - 9 246 9 - 382 Provision 267 6 395 200 26 194 1,326 (11 ) 147 2,550 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (504 ) - (1,352 ) (31 ) - (18 ) (2,009 ) (9 ) - (3,923 ) Recoveries 22 - 27 1 - 8 815 9 - 882 Provision (66 ) 10 2,231 135 33 25 1,150 (4 ) (164 ) 3,350 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 Individually evaluated for impairment $ 154 $ - $ 19 $ - $ - $ - $ 172 $ - $ - $ 345 Collectively evaluated for impairment 3,724 23 1,739 987 248 470 1,664 21 144 9,020 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 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 restructurings granted during the periods indicated (in thousands). For the Year Ended September 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled debt restructurings Real estate loans: Residential 6 $ 1,154 $ 1,167 Construction - - - Commercial 2 1,208 1,163 Commercial - - - Obligations of states and political subdivisions - - - Home equity loans and lines of credit - - - Auto loans 2 37 37 Other 1 22 22 Total 11 $ 2,421 $ 2,389 For the Year Ended September 30, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled debt restructurings Real estate loans: Residential 12 $ 1,701 $ 1,701 Construction - - - Commercial 4 2,139 2,139 Commercial - - - Obligations of states and political subdivisions - - - Home equity loans and lines of credit 1 5 5 Auto loans - - - Other - - - Total 17 $ 3,845 $ 3,845

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Sep. 30, 2017
Property Plant And Equipment [Abstract]
Composition of Premises and Equipment	Premises and equipment consist of the following (in thousands): 2017 2016 Land and land improvements $ 6,269 $ 6,269 Buildings and leasehold improvements 17,047 16,861 Furniture, fixtures, and equipment 11,412 11,159 Construction in process 30 2 34,758 34,291 Less accumulated depreciation (18,524 ) (17,447 ) Total $ 16,234 $ 16,844

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Sep. 30, 2017
Banking And Thrift [Abstract]
Schedule of Deposits and Respective Weighted-Average Interest Rates by Major Classifications	Deposits and their respective weighted-average interest rates consist of the following major classifications (in thousands): 2017 2016 Weighted- Average Interest Rate Amount Weighted- Average Interest Rate Amount Noninterest-bearing demand accounts — % $ 160,125 — % $ 142,924 Interest bearing demand accounts 0.24 208,369 0.13 167,259 Money market accounts 0.51 253,949 0.31 249,947 Savings and club accounts 0.05 141,521 0.05 142,021 Certificates of deposit 1.39 510,897 1.20 512,669 Total 0.70 % $ 1,274,861 0.64 % $ 1,214,820 2017 2016 Weighted- Average Interest Rate Amount Weighted- Average Interest Rate Amount Certificates of deposit: 0.00 - 2.00% 1.30 % $ 460,132 1.14 % $ 484,341 2.01 - 4.00% 2.19 50,765 2.26 28,328 Total 1.39 % $ 510,897 1.20 % $ 512,669
Scheduled Maturities of Certificates of Deposit	At September 30, 2017 scheduled maturities of certificates of deposit are as follows (in thousands): 2018 $ 291,086 2019 121,643 2020 57,124 2021 14,577 2022 26,467 Total $ 510,897
Scheduled Maturities of Certificates of Deposit in Denominations	The scheduled maturities of certificates of deposit in denominations of $250,000 or more as of September 30, 2017, are as follows (in thousands): Within three months $ 11,082 Three through six months 26,824 Six through twelve months 14,803 Over twelve months 18,364 Total $ 71,073

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Short-Term Borrowings	The following table sets forth information concerning short-term borrowings (in thousands): 2017 2016 2015 Balance at year-end $ 137,466 $ 129,460 $ 91,339 Maximum amount outstanding at any month-end 185,201 182,636 132,533 Average balance outstanding during the year 147,765 120,590 115,006 Weighted-average interest rate: As of year-end 1.36 % 0.64 % 0.40 % Paid during the year 0.98 % 0.55 % 0.37 %

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Contractual Maturities of FHLB Long-Term Advances	The following table presents contractual maturities of FHLB long-term advances (in thousands): Maturity Range Weighted- Average Stated Interest Rate Ranged Description From To Interest Rate From To 2017 2016 Convertible 12/5/2018 12/5/2018 3.30 % 3.30 % 3.30 % $ 5,000 $ 5,000 Fixed rate 10/23/2017 10/27/2020 1.68 0.89 2.85 75,601 98,851 Mid-term 10/23/2017 9/9/2019 1.29 0.76 1.66 93,567 126,750 Total $ 174,168 $ 230,601
Maturities of FHLB Long-Term Advances	Maturities of FHLB long-term advances are summarized as follows (in thousands): Year Ending September 30, Amount Weighted- Average Rate 2018 $ 89,075 1.29 % 2019 70,247 1.78 2020 11,746 1.70 2021 3,100 1.57 Total $ 174,168 1.52 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Schedule of Provision for Income Taxes	The provision for income taxes consists of (in thousands): 2017 2016 2015 Current: Federal $ 837 $ 3,456 $ 2,154 State — — 16 Total current taxes 837 3,456 2,170 Deferred income tax benefit 754 (873 ) 784 Total income tax provision $ 1,591 $ 2,583 $ 2,954
Schedule of Changes in Significant Portions of the Deferred Tax Assets and Deferred Tax Liabilities	The tax effects of deductible and taxable temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 3,184 $ 3,079 Adjustment to record funded status of pension plan 324 3,134 Investment losses subject to Section 382 limitation 4,562 5,018 Purchase accounting adjustment 341 49 Net unrealized loss on securities 478 — Deferred compensation 631 643 Other real estate owned 273 293 Nonaccrual interest 223 332 Other 3,385 3,669 Total gross deferred tax assets 13,401 16,217 Deferred tax liabilities: Pension plan 924 998 Net unrealized gain on securities — 2,036 Mortgage servicing rights 80 93 Premises and equipment 12 218 Net unrealized gain on derivatives 413 102 Other 1,550 885 Total gross deferred tax liabilities 2,979 4,332 Net deferred tax assets $ 10,422 $ 11,885
Schedule of Reconciliation of the Federal Statutory Rate and the Effective Income Tax Rate	The reconciliation of the federal statutory rate and the Company’s effective income tax rate is as follows (in thousands): 2017 2016 2015 Amount % of Pretax Income Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 3,036 34.0 % $ 3,505 34.0 % $ 4,333 34.0 % Income from bank-owned life insurance (351 ) (3.9 ) (319 ) (3.1 ) (318 ) (2.5 ) Tax-exempt income (843 ) (9.5 ) (826 ) (8.0 ) (752 ) (5.9 ) Low-income housing credits (197 ) (2.2 ) (226 ) (2.2 ) (254 ) (2.0 ) Nondeductible merger expenses — — 89 0.9 21 0.2 Other, net (54 ) (0.6 ) 360 3.5 (76 ) (0.6 ) Actual tax expense and effective rate $ 1,591 17.8 % $ 2,583 25.1 % $ 2,954 23.2 %

Commitments and Contingent Li40

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Components of Off Balance Sheet Commitments	The off-balance sheet commitments consist of the following (in thousands): 2017 2016 Commitments to extend credit $ 67,265 $ 82,223 Standby letters of credit 2,810 3,187 Unfunded lines of credit 77,390 59,620

Lease Commitments and Total R41

Lease Commitments and Total Rental Expense (Tables)	12 Months Ended
	Sep. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments By Year and in the Aggregate	Future minimum lease payments by year and in the aggregate, under noncancellable operating leases with initial or remaining terms of one year or more, consisted of the following at September 30, 2017 (in thousands): 2018 $ 920 2019 780 2020 706 2021 515 2022 351 2023 and beyond 946 Total $ 4,218

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Sep. 30, 2017
Postemployment Benefits [Abstract]
Components of the ESOP Shares	The following table presents the components of the ESOP shares: 2017 2016 Allocated shares 359,711 361,308 Shares committed to be released 33,962 33,962 Unreleased shares 871,686 916,968 Total ESOP shares 1,265,359 1,312,238 Fair value of unreleased shares (in thousands) $ 13,685 $ 12,682
Schedule of Stock Option Activity	The following is a summary of the Company’s stock option activity and related information for its option plan for the year ended September 30, 2017. Number of Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding, September 30, 2016 905,987 $ 12.35 1.67 $ 1,341 Granted - - - - Exercised 611,341 12.35 0.67 - Forfeited - - - - Outstanding, September 30, 2017 294,646 12.35 0.67 987 Exercisable at year-end 294,646 12.35 0.67 987
Schedule of Nonvested Restricted Stock Option Activity	The following is a summary of the status of the Company’s nonvested restricted stock as of September 30, 2017, and changes therein during the year 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 (21,175 ) 13.62 Forfeited - - Nonvested at September 30, 2017 34,692 $ 14.89
Summary of Change in Plan Assets and Benefit Obligation	The following table sets forth the change in plan assets and benefit obligation at September 30 (in thousands): 2017 2016 Change in benefit projected obligation: Projected benefit obligation at beginning of year $ 25,470 $ 22,093 Service cost 516 987 Interest cost 859 972 Actuarial (gains) losses (2,857 ) 2,012 Curtailment (Plan Freeze) (4,579 ) - Benefits paid (811 ) (594 ) Projected benefit obligation at end of year 18,598 25,470 Change in plan assets: Fair value of plan assets at beginning of year 19,188 17,507 Actual return on plan assets 1,986 1,644 Contributions - 631 Benefits paid (811 ) (594 ) Fair value of plan assets at end of year 20,363 19,188 Funded status $ 1,765 $ (6,282 )
Summary of the Components of Net Periodic Pension Cost	Amounts not yet recognized as a component of net periodic pension cost (in thousands): 2017 2016 2015 Amounts recognized in accumulated other comprehensive loss consist of: Net loss $ 953 $ 9,216 $ 8,068
Summary of the Components of Net Periodic Benefit Cost	The following table comprises the components of net periodic benefit cost for the years ended September 30 (in thousands): 2017 2016 2015 Service cost $ 516 $ 987 $ 873 Interest cost 859 972 826 Expected return on plan assets (1,385 ) (1,244 ) (1,233 ) Amortization of unrecognized loss 226 463 241 Net periodic benefit cost $ 216 $ 1,178 $ 707
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine benefit obligations: 2017 2016 Discount rate 3.85 % 3.70 % Rate of compensation increase N/A 3.00
Schedule of Assumptions Used to Determine Net Periodic Benefit Cost	Weighted-average assumptions used to determine net periodic benefit cost for the years ended: 2017 2016 2015 Discount rate 4.10 % 4.45 % 4.45 % Expected long-term return on plan assets 7.00 7.00 7.00 Rate of compensation increase N/A 4.00 4.00
Summary of the Plan's Financial Assets at Fair Value, within the Fair Value Hierarchy	The following tables set forth by level, within the fair value hierarchy, the plan’s financial assets at fair value as of September 30, 2017 and 2016 (in thousands): September 30, 2017 Level I Level II Level III Total Assets: Investment in collective trusts Fixed income $ - $ 7,999 $ - $ 7,999 Equity - 12,353 - 12,353 Investment in short-term investments - 11 - 11 Total assets at fair value $ - $ 20,363 $ - $ 20,363 September 30, 2016 Level I Level II Level III Total Assets: Investment in collective trusts Fixed income $ - $ 7,654 $ - $ 7,654 Equity - 11,502 - 11,502 Investment in short-term investments - 32 - 32 Total assets at fair value $ - $ 19,188 $ - $ 19,188
The Bank's Defined Benefit Pension Plan Weighted-Average Asset Allocations	The Bank’s defined benefit pension plan weighted-average asset allocations at September 30, 2017 and 2016 by asset category, are as follows: September 30, Asset Category 2017 2016 Fixed income securities 39.3 % 39.9 % Equity securities 60.7 59.9 Other 0.0 0.2 Total 100.0 % 100.0 %
Summary of Estimated Future Benefit Payments	Estimated future benefit payments, which reflect expected future service, as appropriate, are as follows (in thousands): 2018 $ 1,109 2019 851 2020 2,949 2021 3,181 2022 556 2023-2027 5,691

Regulatory Capital Requiremen43

Regulatory Capital Requirements (Tables)	12 Months Ended
	Sep. 30, 2017
Banking And Thrift [Abstract]
Reconciliation of Bank's Capital Under U.S. Generally Accepted Accounting Principles to Regulatory Capital	The following table reconciles the Bank’s capital under U.S. generally accepted accounting principles to regulatory capital (in thousands): 2017 2016 Total stockholders’ equity $ 175,127 $ 166,327 Accumulated other comprehensive loss 754 1,832 Goodwill and certain other intangible assets (15,276 ) (15,294 ) Tier I, common equity and core capital 160,605 152,865 Allowance for loan losses and off-balance sheet commitments 9,720 9,411 Total risk-based capital $ 170,325 $ 162,276
The Bank's Actual Capital Ratios	The Bank’s actual capital ratios are presented in the following table (in thousands): 2017 2016 Amount Ratio Amount Ratio Total capital (to risk-weighted assets) Actual $ 170,325 14.0 % $ 162,276 13.7 % For capital adequacy purposes 97,458 8.0 94,548 8.0 To be well capitalized 121,822 10.0 118,186 10.0 Tier 1 capital (to risk-weighted assets) Actual $ 160,605 13.2 % $ 152,865 12.9 % For capital adequacy purposes 73,093 6.0 70,911 6.0 To be well capitalized 97,458 8.0 94,548 8.0 Common equity tier 1 capital (to risk-weighted assets) Actual $ 160,605 13.2 % $ 152,865 12.9 % For capital adequacy purposes 54,820 4.5 53,183 4.5 To be well capitalized 79,184 6.5 76,821 6.5 Tier 1 capital (to adjusted assets) Actual $ 160,605 9.2 % $ 152,865 8.8 % For capital adequacy purposes 69,878 4.0 69,811 4.0 To be well capitalized 87,247 5.0 87,264 5.0

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Securities, Real Estate Owned and Impaired Loans Measured at Fair Value	The following tables present information about the Company’s securities, real estate owned, and impaired loans measured at fair value as of September 30, 2017 and 2016, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value (in thousands): September 30, 2017 Level I Level II Level III Total Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage-backed securities $ - $ 233,823 $ - $ 233,823 Obligations of states and political subdivisions - 65,358 - 65,358 U.S. government agency securities - 18,671 - 18,671 Corporate obligations - 41,518 7,224 48,742 Other debt securities - 23,833 - 23,833 Equity securities - financial services 25 - - 25 Total securities 25 383,203 7,224 390,452 Derivatives and hedging activities: - 1,215 - 1,215 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate owned - - 1,424 1,424 Impaired loans - - 15,231 15,231 Mortgage servicing rights - - 232 232 September 30, 2016 Level I Level II Level III Total Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage-backed securities $ - $ 219,162 $ - $ 219,162 Obligations of states and political subdivisions - 73,690 - 73,690 U.S. government agency securities - 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 securities 25 382,900 7,485 390,410 Derivatives and hedging activities: - 453 - 453 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate owned - - 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 table presents a summary of changes in the fair value of the Company’s Level III investments for the years ended September 30, 2017 and 2016 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) September 30, 2017 September 30, 2016 Beginning balance $ 7,485 $ 4,211 Purchases, sales, issuances, settlements, net - 3,292 Total unrealized gain: Included in earnings - - Included in other comprehensive income 4 (18 ) Transfers into Level III 750 - Transfers out of Level III (1,015 ) - $ 7,224 $ 7,485
Summary of Additional Quantitative Information about Assets Measured at Fair Value on a Nonrecurring Basis	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level III inputs to determine fair value (dollars in thousands): Quantitative Information About Level III Fair Value Measurements Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted September 30, 2017 Impaired loans $ 15,231 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 57% (24.0%) Foreclosed real estate owned 1,424 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 46% (22.1%) Mortgage servicing rights 232 Discounted cash flow Discount rate 11% (11%) Prepayment speeds 10% to 42% (15.9%) 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%) 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 III 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 is presented as a percent of the appraisal. (3) Includes qualitative adjustments by management and estimated liquidation expenses.

Fair Value of Financial Instr45

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Values of the Company's Financial Instruments	The fair values of the Company’s financial instruments are as follows (in thousands): September 30, 2017 Carrying Value Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 41,683 $ 41,683 $ - $ - $ 41,683 Certificates of deposit 500 - - 505 505 Investment and mortgage-backed securities available for sale 390,452 25 383,203 7,224 390,452 Loans receivable, net 1,236,681 - - 1,235,368 1,235,368 Accrued interest receivable 6,149 6,149 - - 6,149 Regulatory stock 13,832 13,832 - - 13,832 Mortgage servicing rights 232 - - 232 232 Derivatives 1,215 - 1,215 - 1,215 Bank-owned life insurance 37,626 37,626 - - 37,626 Financial liabilities: Deposits $ 1,274,861 $ 763,964 $ - $ 511,392 $ 1,275,356 Short-term borrowings 137,446 137,446 - - 137,446 Other borrowings 174,168 - - 174,107 174,107 Advances by borrowers for taxes and insurance 5,163 5,163 - - 5,163 Accrued interest payable 1,043 1,043 - - 1,043 September 30, 2016 Carrying Value 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 Comprehensi46

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Activity in Accumulated Other Comprehensive Income (Loss)	The activity in accumulated other comprehensive income (loss) for the years ended September 30, 2017 and 2016, is as follows (in thousands): Accumulated Other Comprehensive Income (Loss) (1) 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 before reclassifications and pension plan curtailment 2,284 (4,684 ) 505 (1,895 ) Pension plan curtailment 3,022 - - 3,022 Amounts reclassified from accumulated other comprehensive loss 149 (195 ) (3 ) (49 ) Period change 5,455 (4,879 ) 502 1,078 Balance at September 30, 2017 $ (628 ) $ (927 ) $ 801 $ (754 ) Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ - $ (2,395 ) Other comprehensive income before reclassifications (1,064 ) 1,853 284 1,073 Amounts reclassified from accumulated other comprehensive loss 306 (831 ) 15 (510 ) Period change (758 ) 1,022 299 563 Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Balance at September 30, 2014 $ (3,228 ) $ 649 $ - $ (2,579 ) Other comprehensive income before reclassifications (2,256 ) 2,799 - 543 Amounts reclassified from accumulated other comprehensive loss 159 (518 ) - (359 ) Period change (2,097 ) 2,281 - 184 Balance at September 30, 2015 $ (5,325 ) $ 2,930 $ - $ (2,395 ) (1) All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate approximating 34%.
Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss)	Details About Accumulated Other Comprehensive Loss Components Amount Reclassified from Accumulated Other Comprehensive Loss For the Year Ended September 30, (4) Affected Line Item in the Consolidated (in thousands) 2017 2016 2015 Statement of Income Securities available for sale (1) Net securities gains reclassified into earnings $ 295 $ 1,258 $ 786 Gain on sale of investments, net Related income tax expense (100 ) (427 ) (268 ) Income taxes Net effect on accumulated other comprehensive loss for the period 195 831 518 Defined benefit pension plan (2) Amortization of net (loss) gain and prior service costs (226 ) (463 ) (241 ) Compensation and employee benefits Related income tax expense 77 157 82 Income taxes Net effect on accumulated other comprehensive loss for the period (149 ) (306 ) (159 ) Derivatives and Hedging Activities (3) Interest expense, effective portion 5 (23 ) - Interest expense Related income tax expense (2 ) 8 - Income taxes Net effect on accumulated other comprehensive loss for the period 3 (15 ) - Total reclassifications for the period $ 49 $ 510 $ 359 (1) For additional details related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income (loss) see Note 3, “Investment Securities.” (2) Included in the computation of net periodic pension cost. See Note 12, “Employee Benefits” for additional detail. (3) For additional details related to derivative financial instruments see Note18, “Derivatives and Hedging Activities.” (4) Amounts in parenthesis indicate debits.

Derivatives and Hedging Activit

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Sep. 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	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 September 30, 2017 and September 30, 2016, (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of September 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 $ 1,215 Other Assets $ 453
Schedule of Pre-Tax Net Gains (Losses) of Cash flow Hedges	The table below presents the pre-tax net gains (losses) of the Company’s cash flow hedges for the period ended September 30, 2017 and 2016, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow Hedging Relationships Gain Recognized in OCI on Derivative (Effective Portion) Year Ended September 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Year Ended September 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Year Ended September 30, 2017 2016 2017 2016 2017 2016 Interest Rate Products $ 911 $ 430 Interest expense $ 5 $ (23 ) Other non-interest income $ - $ - Ending balance of OCI Total $ 911 $ 430 $ 5 $ (23 ) $ - $ -

Parent Company (Tables)

Parent Company (Tables)	12 Months Ended
	Sep. 30, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	Condensed financial statements of ESSA Bancorp, Inc. are as follows (in thousands): CONDENSED BALANCE SHEET September 30, 2017 2016 ASSETS Cash and due from banks $ 5,034 $ 7,176 Investment securities available for sale 25 25 Investment in subsidiary 175,127 166,327 Premises and equipment, net 1,093 1,118 Other assets 1,577 1,792 TOTAL ASSETS $ 182,856 $ 176,438 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ 129 $ 94 Stockholders’ equity 182,727 176,344 TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY $ 182,856 $ 176,438
Condensed Statement of Income	CONDENSED STATEMENT OF INCOME Year Ended September 30, 2017 2016 2015 INCOME Interest income $ 426 $ 383 $ 376 Dividends - 34,000 8,000 Total income 426 34,383 8,376 EXPENSES Professional fees 455 860 755 Other 51 50 64 Total expenses 506 910 819 Income (loss) before income tax expense (80 ) 33,473 7,557 Income tax benefit (27 ) (91 ) (118 ) Income (loss) before equity in undistributed net earnings of subsidiary (53 ) 33,564 7,675 Equity in undistributed net earnings of subsidiary 7,392 (25,837 ) 2,116 NET INCOME $ 7,339 $ 7,727 $ 9,791 COMPREHENSIVE INCOME $ 8,417 $ 8,290 $ 9,975
Condensed Statement of Cash Flows	CONDENSED STATEMENT OF CASH FLOWS Year Ended September 30, 2017 2016 2015 OPERATING ACTIVITIES Net income $ 7,339 $ 7,727 $ 9,791 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed net earnings of subsidiary (7,391 ) 25,837 (2,116 ) Provision for depreciation 25 26 24 (Decrease) increase in accrued income taxes (34 ) (369 ) 40 (Increase) decrease in accrued interest receivable 1 (13 ) 8 Deferred federal income taxes (5 ) 3 (3 ) Other, net 974 (60 ) 458 Net cash provided by operating activities 909 33,151 8,202 INVESTING ACTIVITIES Certificate of deposit maturities - - 17 Acquisition and additional capitalization of subsidiary, net of cash acquired - (24,203 ) - Purchase of premises, equipment and software - - (41 ) Net cash used for investing activities - (24,203 ) (24 ) FINANCING ACTIVITIES Purchase of treasury stock shares - (301 ) (3,132 ) Proceeds from the exercise of stock options 779 18 - Dividends on common stock (3,830 ) (3,747 ) (3,546 ) Net cash used for financing activities (3,051 ) (4,030 ) (6,678 ) Increase (decrease) in cash (2,142 ) 4,918 1,500 CASH AT BEGINNING OF YEAR 7,176 2,258 758 CASH AT END OF YEAR $ 5,034 $ 7,176 $ 2,258

Selected Quarterly Data (Unau49

Selected Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of Selected Quarterly Data	Three Months Ended December 31, 2016 March 31, 2017 June 30, 2017 September 30, 2017 Total interest income $ 14,650 $ 14,379 $ 14,408 $ 14,881 Total interest expense 3,018 3,075 3,248 3,458 Net interest income 11,632 11,304 11,160 11,423 Provision for loan losses 750 750 750 1,100 Net interest income after provision for loan losses 10,882 10,554 10,410 10,323 Total noninterest income 1,857 1,784 2,120 2,438 Total noninterest expense 10,402 10,504 10,320 10,212 Income before income taxes 2,337 1,834 2,210 2,549 Income taxes expense 400 203 448 540 Net income $ 1,937 $ 1,631 $ 1,762 $ 2,009 Per share data: Net income Basic $ 0.18 $ 0.15 $ 0.16 $ 0.19 Diluted $ 0.18 $ 0.15 $ 0.16 $ 0.19 Average shares outstanding Basic 10,475,032 10,592,997 10,678,856 10,704,554 Diluted 10,604,072 10,691,960 10,743,008 10,766,159 Three Months Ended December 31, 2015 March 31, 2016 June 30, 2016 September 30, 2016 Total interest income $ 13,815 $ 15,159 $ 14,723 $ 14,669 Total interest expense 2,723 2,875 2,864 2,969 Net interest income 11,092 12,284 11,859 11,700 Provision for loan losses 600 600 600 750 Net interest income after provision for loan losses 10,492 11,684 11,259 10,950 Total noninterest income 1,817 2,277 2,296 2,393 Total noninterest expense 9,786 11,106 10,651 11,315 Income before income taxes 2,523 2,855 2,904 2,028 Income taxes benefit 566 726 792 499 Net income $ 1,957 $ 2,129 $ 2,112 $ 1,529 Per share data: Net income Basic $ 0.19 $ 0.20 $ 0.20 $ 0.15 Diluted $ 0.19 $ 0.20 $ 0.20 $ 0.14 Average shares outstanding Basic 10,364,425 10,385,154 10,426,304 10,456,404 Diluted 10,535,573 10,524,697 10,553,138 10,579,314

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Sep. 30, 2017
Pro Forma Selected Information	Pro Formas Year Ended September 30, (unaudited) (in thousands, except per share data) 2017 2016 2015 Net interest income $ 45,519 $ 48,321 $ 50,238 Noninterest income 8,199 8,866 8,628 Net income 7,339 6,077 9,804 Pro forma earnings per share: Basic $ 0.69 $ 0.58 $ 0.94 Diluted $ 0.69 $ 0.58 $ 0.93
Eagle National Bancorp, Inc [Member]
Condensed Statement Reflecting Values Assigned to Net Assets	The following condensed statement reflects the values assigned to ENB net assets as of the acquisitions date (in thousands): Total purchase price $ 24,655 Net assets acquired: Cash 8,481 Investments available for sale 36,275 Loans receivable 123,380 Regulatory Stock 889 Premises and equipment, net 945 Intangible assets 1,491 Deferred tax assets 715 Other assets 2,174 Certificates of deposits (32,408 ) Deposits other than certificates of deposits (119,865 ) Other liabilities (964 ) 21,113 Goodwill resulting from ENB merger $ 3,542

Summary of Significant Accoun51

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
Days past due over which loans are considered as substandard	90 days
Total servicing assets included in other assets	$ 232,000	$ 398,000
Goodwill and Intangible Assets Impairment	$ 0	$ 0
Threshold percentage minimum for recognition upon settlement	Greater than 50%
ASU 2016-09 [Member]
Summary Of Significant Accounting Policies [Line Items]
Excess tax benefits exercise of nonqualified stock options	$ 152,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Depreciation range for buildings, land improvements, and leasehold improvements	10 years
Depreciation range for furniture, fixtures, and equipment	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Depreciation range for buildings, land improvements, and leasehold improvements	40 years
Depreciation range for furniture, fixtures, and equipment	7 years
Cash equivalents interest bearing deposits with original maturities	90 days
Maximum [Member] | ASU 2016-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of increase in assets and liabilities	1.00%
Troubled Debt Restructuring [Member]
Summary Of Significant Accounting Policies [Line Items]
Days past due over which loans are considered as substandard	180 days
Federal Home Loan Bank System [Member]
Summary Of Significant Accounting Policies [Line Items]
Loan receivables contractual period for interest and principal accrual	90 days
Percentage Investment in capital stock	0.10%
Investment on outstanding Borrowings, percentage	4.00%
Stock bought and sold based upon par value	$ 100
ESSA Advisory Services, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage ownership of wholly owned subsidiary	100.00%

Summary of Significant Accoun52

Summary of Significant Accounting Policies - Carrying Amount of Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Goodwill
Balance at beginning of year	$ 13,801	$ 10,259
Goodwill acquired		3,542
Balance at end of year	13,801	13,801	$ 10,259
Intangible assets
Balance at beginning of year	2,487	1,759
Intangible assets acquired		1,491
Amortization	(643)	(763)	(637)
Balance at end of year	$ 1,844	$ 2,487	$ 1,759

Summary of Significant Accoun53

Summary of Significant Accounting Policies - Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 643	$ 763	$ 637
Customer Data [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,787
Accumulated Amortization	$ 2,943	$ 2,300

Summary of Significant Accoun54

Summary of Significant Accounting Policies - Estimated Future Amortization Expense (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Accounting Policies [Abstract]
2,018	$ 469
2,019	309
2,020	275
2,021	272
2,022	239
2,023	190
2,024	90
Total estimated future amortization of expense	$ 1,844

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								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted-average common shares outstanding									18,133,095	18,133,095	18,133,095
Average treasury stock shares									(6,606,116)	(6,769,423)	(6,682,911)
Average unearned ESOP shares									(882,617)	(927,908)	(973,168)
Average unearned nonvested shares									(42,629)	(37,276)	(22,560)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share	10,704,554	10,678,856	10,592,997	10,475,032	10,456,404	10,426,304	10,385,154	10,364,425	10,601,733	10,398,488	10,454,456
Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share											9,787
Additional common stock equivalents (stock options) used to calculate diluted earnings per share									61,724	120,580	78,887
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share	10,766,159	10,743,008	10,691,960	10,604,072	10,579,314	10,553,138	10,524,697	10,535,573	10,663,457	10,519,068	10,543,130

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - Stock Option [Member] - $ / shares	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	43,953	31,896	12,230
Average weighted price per share of anti-dilutive shares	$ 14.50	$ 13	$ 11.07

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	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 391,857	$ 384,422
Available for sale, Gross Unrealized Gains	2,392	7,067
Available for sale, Gross Unrealized Losses	(3,797)	(1,079)
Available for sale, Fair Value	390,452	390,410
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	119,333	115,535
Available for sale, Gross Unrealized Gains	207	1,891
Available for sale, Gross Unrealized Losses	(1,203)	(173)
Available for sale, Fair Value	118,337	117,253
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	98,668	84,486
Available for sale, Gross Unrealized Gains	177	1,369
Available for sale, Gross Unrealized Losses	(808)	(85)
Available for sale, Fair Value	98,037	85,770
Governmental National Mortgage Association Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	17,609	16,091
Available for sale, Gross Unrealized Gains	43	76
Available for sale, Gross Unrealized Losses	(203)	(28)
Available for sale, Fair Value	17,449	16,139
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	235,610	216,112
Available for sale, Gross Unrealized Gains	427	3,336
Available for sale, Gross Unrealized Losses	(2,214)	(286)
Available for sale, Fair Value	233,823	219,162
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	64,382	71,323
Available for sale, Gross Unrealized Gains	1,522	2,432
Available for sale, Gross Unrealized Losses	(546)	(65)
Available for sale, Fair Value	65,358	73,690
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	18,615	25,669
Available for sale, Gross Unrealized Gains	61	272
Available for sale, Gross Unrealized Losses	(5)
Available for sale, Fair Value	18,671	25,941
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	49,025	38,331
Available for sale, Gross Unrealized Gains	335	599
Available for sale, Gross Unrealized Losses	(618)	(512)
Available for sale, Fair Value	48,742	38,418
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	24,200	32,962
Available for sale, Gross Unrealized Gains	47	428
Available for sale, Gross Unrealized Losses	(414)	(216)
Available for sale, Fair Value	23,833	33,174
Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	391,832	384,397
Available for sale, Gross Unrealized Gains	2,392	7,067
Available for sale, Gross Unrealized Losses	(3,797)	(1,079)
Available for sale, Fair Value	390,427	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	Sep. 30, 2017USD ($)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	$ 14,530
Due after one year through five years, Amortized Cost	34,229
Due after five years through ten years, Amortized Cost	89,022
Due after ten years, Amortized Cost	254,051
Total, Amortized Cost	391,832
Due in one year or less, Fair Value	14,536
Due after one year through five years, Fair Value	34,504
Due after five years through ten years, Fair Value	88,947
Due after ten years, Fair Value	252,440
Total, Fair Value	$ 390,427

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Realized gross gains		$ 299,000	$ 1,258,000	$ 796,000
Proceeds from the sale of investment securities		17,378,000	63,370,000	20,953,000
Realized gross losses		4,000	0	$ 10,000
Investment securities with carrying values		$ 235,926,000	$ 201,596,000
Eagle National Bancorp, Inc [Member]
Schedule of Available-for-sale Securities [Line Items]
Realized gross gains	$ 0
Proceeds from the sale of investment securities	16,200,000
Realized gross losses	$ 0

Investment Securities - Sched60

Investment Securities - Schedule of Gross Unrealized Losses and Fair Value (Detail) $ in Thousands	Sep. 30, 2017USD ($)Security	Sep. 30, 2016USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	174	70
Fair Value, Less than Twelve Months	$ 149,633	$ 48,782
Gross Unrealized Losses, Less than Twelve Months	(1,225)	(411)
Fair Value, Twelve Months or Greater	83,272	32,120
Gross Unrealized Losses, Twelve Months or Greater	(2,572)	(668)
Fair Value, Total	232,905	80,902
Gross Unrealized Losses, Total	$ (3,797)	$ (1,079)
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	55	17
Fair Value, Less than Twelve Months	$ 61,852	$ 6,841
Gross Unrealized Losses, Less than Twelve Months	(558)	(21)
Fair Value, Twelve Months or Greater	20,679	12,261
Gross Unrealized Losses, Twelve Months or Greater	(645)	(152)
Fair Value, Total	82,531	19,102
Gross Unrealized Losses, Total	$ (1,203)	$ (173)
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	39	11
Fair Value, Less than Twelve Months	$ 38,913	$ 7,457
Gross Unrealized Losses, Less than Twelve Months	(354)	(11)
Fair Value, Twelve Months or Greater	16,427	6,375
Gross Unrealized Losses, Twelve Months or Greater	(454)	(74)
Fair Value, Total	55,340	13,832
Gross Unrealized Losses, Total	$ (808)	$ (85)
Governmental National Mortgage Association Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	11	5
Fair Value, Less than Twelve Months	$ 6,669	$ 4,704
Gross Unrealized Losses, Less than Twelve Months	(41)	(16)
Fair Value, Twelve Months or Greater	6,903	1,267
Gross Unrealized Losses, Twelve Months or Greater	(162)	(12)
Fair Value, Total	13,572	5,971
Gross Unrealized Losses, Total	$ (203)	$ (28)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	25	12
Fair Value, Less than Twelve Months	$ 10,944	$ 14,420
Gross Unrealized Losses, Less than Twelve Months	(59)	(65)
Fair Value, Twelve Months or Greater	17,425
Gross Unrealized Losses, Twelve Months or Greater	(487)
Fair Value, Total	28,369	14,420
Gross Unrealized Losses, Total	$ (546)	$ (65)
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	3
Fair Value, Less than Twelve Months	$ 8,995
Gross Unrealized Losses, Less than Twelve Months	(5)
Fair Value, Total	8,995
Gross Unrealized Losses, Total	$ (5)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	22	12
Fair Value, Less than Twelve Months	$ 15,119	$ 8,778
Gross Unrealized Losses, Less than Twelve Months	(104)	(172)
Fair Value, Twelve Months or Greater	8,032	5,303
Gross Unrealized Losses, Twelve Months or Greater	(514)	(340)
Fair Value, Total	23,151	14,081
Gross Unrealized Losses, Total	$ (618)	$ (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	$ 7,141	$ 6,582
Gross Unrealized Losses, Less than Twelve Months	(104)	(126)
Fair Value, Twelve Months or Greater	13,806	6,914
Gross Unrealized Losses, Twelve Months or Greater	(310)	(90)
Fair Value, Total	20,947	13,496
Gross Unrealized Losses, Total	$ (414)	$ (216)

Loans Receivable - Summary of L

Loans Receivable - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Real estate loans:
Total Loans	$ 1,246,046	$ 1,228,269
Less allowance for loan losses	9,365	9,056	$ 8,919	$ 8,634
Net loans	1,236,681	1,219,213
Residential Real Estate Loans [Member]
Real estate loans:
Total Loans	586,708	596,645
Less allowance for loan losses	3,878	4,426	5,140	5,573
Construction Real Estate Loans [Member]
Real estate loans:
Total Loans	3,097	1,733
Commercial Real Estate Loans [Member]
Real estate loans:
Total Loans	318,323	288,447
Less allowance for loan losses	1,758	852	671	663
Commercial Loans [Member]
Real estate loans:
Total Loans	44,129	39,978
Less allowance for loan losses	987	882	693	528
Obligations of States and Political Subdivisions [Member]
Real estate loans:
Total Loans	58,079	56,923
Less allowance for loan losses	248	215	189	163
Home Equity Loans and Lines of Credit [Member]
Real estate loans:
Total Loans	46,219	48,163
Less allowance for loan losses	470	455	461	470
Auto Loans [Member]
Real estate loans:
Total Loans	186,646	193,078
Less allowance for loan losses	1,836	1,880	1,570	459
Other [Member]
Real estate loans:
Total Loans	2,845	3,302
Less allowance for loan losses	$ 21	$ 25	$ 27	$ 32

Loans Receivable - Changes in A

Loans Receivable - Changes in Accretable Yield for Purchased Credit-Impaired Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Receivables [Abstract]
Balance at beginning of period	$ 478	$ 258
Acquisition of ENB		240
Reclassification and other	215	163
Accretion	(222)	(183)
Balance at end of period	$ 471	$ 478

Loans Receivable - Additional I

Loans Receivable - Additional Information (Detail)	3 Months Ended								12 Months Ended
	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)Contract	Sep. 30, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reclassifications of nonaccretable discounts									$ 215,000	$ 163,000
Allowance for loan losses recorded for acquired loans									155,000	236,000
Mortgage loans serviced for others									61,167,000	78,497,000
Purchased impaired loans and non accrual loans	$ 14,263,000				$ 19,315,000				14,263,000	19,315,000	$ 20,105,000
Additional interest income under loan agreements									$ 449,000	782,000	188,000
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									3,923,000	2,795,000	2,083,000
Increase in outstanding loan balances									25,765,000	973,000	49,790,000
Provision for loan losses	1,100,000	$ 750,000	$ 750,000	$ 750,000	$ 750,000	$ 600,000	$ 600,000	$ 600,000	$ 3,350,000	$ 2,550,000	2,075,000
Number of Contracts | Contract									11	17
Number of troubled debt restructuring loans granted terms and rate concessions | Contract									6	8
Troubled debt restructurings granted terms and rate concession									$ 832,000,000,000	$ 2,400,000
Number of troubled debt restructuring loans granted terms concessions | Contract									3	7
Troubled debt restructurings granted terms concession									$ 1,200,000	$ 1,500,000
Number of troubled debt restructuring loans granted interest rate concession | Contract									2	2
Troubled debt restructurings loans granted interest rate concession									$ 368,000	$ 29,000
Number of troubled debt restructurings, loan modified, defaulted within one year of modification | Contract									0	0
Consumer Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Foreclosed assets	819,000,000,000								$ 819,000,000,000
Formal foreclosure proceeding assets	$ 2,200,000								2,200,000
Auto Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs									2,009,000	$ 1,262,000	596,000
Increase in outstanding loan balances									29,900,000	30,900,000	61,600,000
Provision for loan losses									$ 1,150,000	1,326,000	1,620,000
Number of Contracts | Contract									2
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs									$ 1,352,000	266,000	65,000
Provision for loan losses									$ 2,231,000	$ 395,000	$ (11,000)
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of unallocated allowance	10.00%								10.00%

Loans Receivable - Summary of A

Loans Receivable - Summary of Additional Information Regarding Loans Acquired and Accounted (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,246,046	$ 1,228,269
Loans Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	5,490	6,893
Carrying amount	$ 4,388	$ 5,563

Loans Receivable - Schedule of

Loans Receivable - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,246,046	$ 1,228,269
Individually Evaluated for Impairment	15,576	22,565
Collectively Evaluated for Impairment	1,226,082	1,200,141
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,388	5,563
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	586,708	596,645
Individually Evaluated for Impairment	6,202	8,721
Collectively Evaluated for Impairment	580,506	587,924
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	318,323	288,447
Individually Evaluated for Impairment	7,211	11,237
Collectively Evaluated for Impairment	307,337	272,595
Commercial Real Estate Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,775	4,615
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,097	1,733
Collectively Evaluated for Impairment	3,097	1,733
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	44,129	39,978
Individually Evaluated for Impairment	1,385	1,698
Collectively Evaluated for Impairment	42,461	37,869
Commercial Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	283	411
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	58,079	56,923
Collectively Evaluated for Impairment	58,079	56,923
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	46,219	48,163
Individually Evaluated for Impairment	176	361
Collectively Evaluated for Impairment	45,713	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	330	537
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	186,646	193,078
Individually Evaluated for Impairment	572	526
Collectively Evaluated for Impairment	186,074	192,552
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,845	3,302
Individually Evaluated for Impairment	30	22
Collectively Evaluated for Impairment	$ 2,815	$ 3,280

Loans Receivable - Schedule o66

Loans Receivable - Schedule of Investment and Unpaid Principal Balances for Impaired Loans (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 15,576,000	$ 22,565,000
Unpaid Principal Balance	21,157,000	27,215,000
Associated Allowance	345,000	347,000
Average Recorded Investment	18,593,000	26,225,000
Interest	464,000	728,000
With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,297,000	19,994,000
Unpaid Principal Balance	17,232,000	24,488,000
Average Recorded Investment	16,123,000	22,460,000
Interest	457,000	706,000
With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	2,279,000	2,571,000
Unpaid Principal Balance	3,925,000	2,727,000
Associated Allowance	345,000	347,000
Average Recorded Investment	2,470,000	3,765,000
Interest	7,000	22,000
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,202,000	8,721,000
Unpaid Principal Balance	7,994,000	11,167,000
Associated Allowance	154,000	198,000
Average Recorded Investment	7,187,000	9,874,000
Interest	39,000	94,000
Residential Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,392,000	6,721,000
Unpaid Principal Balance	5,730,000	9,016,000
Average Recorded Investment	5,373,000	7,560,000
Interest	39,000	82,000
Residential Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,810,000	2,000,000
Unpaid Principal Balance	2,264,000	2,151,000
Associated Allowance	154,000	198,000
Average Recorded Investment	1,814,000	2,314,000
Interest		12,000
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,211,000	11,237,000
Unpaid Principal Balance	10,589,000	13,231,000
Associated Allowance	19,000	36,000
Average Recorded Investment	9,176,000	13,608,000
Interest	297,000	496,000
Commercial Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	7,191,000	10,939,000
Unpaid Principal Balance	9,396,000	12,928,000
Average Recorded Investment	8,816,000	12,490,000
Interest	297,000	496,000
Commercial Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	20,000	298,000
Unpaid Principal Balance	1,193,000	303,000
Associated Allowance	19,000	36,000
Average Recorded Investment	360,000	1,118,000
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,385,000	1,698,000
Unpaid Principal Balance	1,575,000	1,725,000
Average Recorded Investment	1,609,000	1,558,000
Interest	120,000	124,000
Commercial Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,385,000	1,698,000
Unpaid Principal Balance	1,575,000	1,725,000
Average Recorded Investment	1,579,000	1,556,000
Interest	120,000	124,000
Commercial Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	30,000	2,000
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	176,000	361,000
Unpaid Principal Balance	258,000	432,000
Average Recorded Investment	234,000	643,000
Interest		2,000
Home Equity Loans and Lines of Credit [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	176,000	361,000
Unpaid Principal Balance	258,000	432,000
Average Recorded Investment	231,000	553,000
Interest		2,000
Home Equity Loans and Lines of Credit [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,000	90,000
Auto Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	572,000	526,000
Unpaid Principal Balance	705,000	638,000
Associated Allowance	172,000	113,000
Average Recorded Investment	379,000	536,000
Interest	8,000	12,000
Auto Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	123,000	253,000
Unpaid Principal Balance	237,000	365,000
Average Recorded Investment	116,000	295,000
Interest	1,000	2,000
Auto Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	449,000	273,000
Unpaid Principal Balance	468,000	273,000
Associated Allowance	172,000	113,000
Average Recorded Investment	263,000	241,000
Interest	7,000	10,000
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	30,000	22,000
Unpaid Principal Balance	36,000	22,000
Average Recorded Investment	8,000	6,000
Other [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	30,000	22,000
Unpaid Principal Balance	36,000	22,000
Average Recorded Investment	$ 8,000	$ 6,000

Loans Receivable - Classes of L

Loans Receivable - Classes of Loan Portfolio, Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 1,236,681	$ 1,219,213
Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	420,531	385,348
Commercial And Municipal Portfolio Segment | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	399,629	353,695
Commercial And Municipal Portfolio Segment | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	3,408	9,066
Commercial And Municipal Portfolio Segment | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	17,494	22,587
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	318,323	288,447
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	300,554	260,088
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	3,376	8,886
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	14,393	19,473
Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	44,129	39,978
Commercial And Municipal Portfolio Segment | Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	40,996	36,684
Commercial And Municipal Portfolio Segment | Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	32	180
Commercial And Municipal Portfolio Segment | Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	3,101	3,114
Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	58,079	56,923
Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 58,079	$ 56,923

Loans Receivable - Schedule o68

Loans Receivable - Schedule of Performing or Nonperforming Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,236,681	$ 1,219,213
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	825,515	842,921
Purchase Credit Impaired [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	330	537
Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	817,506	832,624
Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,679	9,760
Residential Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	586,708	596,645
Residential Real Estate Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	580,116	587,673
Residential Real Estate Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,592	8,972
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,097	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	3,097	1,733
Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	46,219	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	330	537
Home Equity Loans and Lines of Credit [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	45,576	47,213
Home Equity Loans and Lines of Credit [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	313	413
Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	186,646	193,078
Auto Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	185,910	192,734
Auto Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	736	344
Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,845	3,302
Other [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,807	3,271
Other [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 38	$ 31

Loans Receivable - Classes of69

Loans Receivable - Classes of Loan Portfolio Summarized by Aging Categories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,227,102	$ 1,204,129
31-60 Days Past Due	3,597	3,538
61-90 Days Past Due	472	1,287
Non-accrual	10,487	13,752
Total Past Due	14,556	18,577
Purchased Credit Impaired, Accuring	612
Purchased Credit Impaired, Nonaccrual	3,776	5,563
Total Loans	1,246,046	1,228,269
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	577,034	585,517
31-60 Days Past Due	2,661	1,496
61-90 Days Past Due	421	660
Non-accrual	6,592	8,972
Total Past Due	9,674	11,128
Total Loans	586,708	596,645
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,097	1,733
Total Loans	3,097	1,733
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	312,098	279,019
31-60 Days Past Due	172	1,093
61-90 Days Past Due		191
Non-accrual	2,278	3,529
Total Past Due	2,450	4,813
Purchased Credit Impaired, Accuring	612
Purchased Credit Impaired, Nonaccrual	3,163	4,615
Total Loans	318,323	288,447
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	43,298	38,862
31-60 Days Past Due	18	185
61-90 Days Past Due		57
Non-accrual	530	463
Total Past Due	548	705
Purchased Credit Impaired, Nonaccrual	283	411
Total Loans	44,129	39,978
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	58,079	56,923
Total Loans	58,079	56,923
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	45,460	47,026
31-60 Days Past Due	101	40
61-90 Days Past Due	15	147
Non-accrual	313	413
Total Past Due	429	600
Purchased Credit Impaired, Nonaccrual	330	537
Total Loans	46,219	48,163
Auto Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	185,247	191,785
31-60 Days Past Due	631	717
61-90 Days Past Due	32	232
Non-accrual	736	344
Total Past Due	1,399	1,293
Total Loans	186,646	193,078
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,789	3,264
31-60 Days Past Due	14	7
61-90 Days Past Due	4
Non-accrual	38	31
Total Past Due	56	38
Total Loans	$ 2,845	$ 3,302

Loans Receivable - Summary of P

Loans Receivable - Summary of Primary Segments of ALL (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				$ 9,056				$ 8,919	$ 9,056	$ 8,919	$ 8,634
Charge-offs									(3,923)	(2,795)	(2,083)
Recoveries									882	382	293
Provision	$ 1,100	$ 750	$ 750	750	$ 750	$ 600	$ 600	600	3,350	2,550	2,075
Balance, End of period	9,365				9,056				9,365	9,056	8,919
Individually evaluated for impairment	345				347				345	347
Collectively evaluated for impairment	9,020				8,709				9,020	8,709
Residential Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				4,426				5,140	4,426	5,140	5,573
Charge-offs									(504)	(1,040)	(1,359)
Recoveries									22	59	76
Provision									(66)	267	850
Balance, End of period	3,878				4,426				3,878	4,426	5,140
Individually evaluated for impairment	154				198				154	198
Collectively evaluated for impairment	3,724				4,228				3,724	4,228
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				852				671	852	671	663
Charge-offs									(1,352)	(266)	(65)
Recoveries									27	52	84
Provision									2,231	395	(11)
Balance, End of period	1,758				852				1,758	852	671
Individually evaluated for impairment	19				36				19	36
Collectively evaluated for impairment	1,739				816				1,739	816
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				13				7	13	7	11
Provision									10	6	(4)
Balance, End of period	23				13				23	13	7
Collectively evaluated for impairment	23				13				23	13
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				882				693	882	693	528
Charge-offs									(31)	(18)	(30)
Recoveries									1	7	23
Provision									135	200	172
Balance, End of period	987				882				987	882	693
Collectively evaluated for impairment	987				882				987	882
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				215				189	215	189	163
Provision									33	26	26
Balance, End of period	248				215				248	215	189
Collectively evaluated for impairment	248				215				248	215
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				455				461	455	461	470
Charge-offs									(18)	(209)	(27)
Recoveries									8	9	15
Provision									25	194	3
Balance, End of period	470				455				470	455	461
Collectively evaluated for impairment	470				455				470	455
Auto Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				1,880				1,570	1,880	1,570	459
Charge-offs									(2,009)	(1,262)	(596)
Recoveries									815	246	87
Provision									1,150	1,326	1,620
Balance, End of period	1,836				1,880				1,836	1,880	1,570
Individually evaluated for impairment	172				113				172	113
Collectively evaluated for impairment	1,664				1,767				1,664	1,767
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				25				27	25	27	32
Charge-offs									(9)		(6)
Recoveries									9	9	8
Provision									(4)	(11)	(7)
Balance, End of period	21				25				21	25	27
Collectively evaluated for impairment	21				25				21	25
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period				$ 308				$ 161	308	161	735
Provision									(164)	147	(574)
Balance, End of period	144				308				144	308	$ 161
Collectively evaluated for impairment	$ 144				$ 308				$ 144	$ 308

Loans Receivable - Summary of T

Loans Receivable - Summary of Troubled Debt Restructurings Granted (Detail) $ in Thousands	12 Months Ended
	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	11	17
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	6	12
Pre-Modification Outstanding Recorded Investment	$ 1,154	$ 1,701
Post-Modification Outstanding Recorded Investment	$ 1,167	$ 1,701
Real Estate Loans [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	4
Pre-Modification Outstanding Recorded Investment	$ 1,208	$ 2,139
Post-Modification Outstanding Recorded Investment	$ 1,163	$ 2,139
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 5
Post-Modification Outstanding Recorded Investment		$ 5
Auto Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 37
Post-Modification Outstanding Recorded Investment	$ 37
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1
Pre-Modification Outstanding Recorded Investment	$ 22
Post-Modification Outstanding Recorded Investment	$ 22
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	11	17
Pre-Modification Outstanding Recorded Investment	$ 2,421	$ 3,845
Post-Modification Outstanding Recorded Investment	$ 2,389	$ 3,845

Premises and Equipment - Compos

Premises and Equipment - Composition of Premises and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Property Plant And Equipment Useful Life And Values [Abstract]
Land and land improvements	$ 6,269	$ 6,269
Buildings and leasehold improvements	17,047	16,861
Furniture, fixtures, and equipment	11,412	11,159
Construction in process	30	2
Premises and equipment Gross	34,758	34,291
Less accumulated depreciation	(18,524)	(17,447)
Total	$ 16,234	$ 16,844

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Property Plant And Equipment Useful Life And Values [Abstract]
Depreciation Expense	$ 1,077,000	$ 1,456,000	$ 1,131,000

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits and Respective Weighted-Average Interest Rates by Major Classifications (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deposits [Line Items]
Weighted Average Interest Rate, Noninterest-bearing demand accounts	0.00%	0.00%
Weighted Average Interest Rate, Interest bearing demand accounts	0.24%	0.13%
Weighted Average Interest Rate, Money market accounts	0.51%	0.31%
Weighted Average Interest Rate, Savings and club accounts	0.05%	0.05%
Weighted Average Interest Rate, Certificates of deposit	1.39%	1.20%
Weighted Average Interest Rate, Total	0.70%	0.64%
Noninterest-bearing demand accounts	$ 160,125	$ 142,924
Interest bearing demand accounts	208,369	167,259
Money market accounts	253,949	249,947
Savings and club accounts	141,521	142,021
Certificates of deposit	510,897	512,669
Total	$ 1,274,861	$ 1,214,820
0.00 - 2.00% [Member]
Deposits [Line Items]
Weighted Average Interest Rate, Certificates of deposit	1.30%	1.14%
Certificates of deposit	$ 460,132	$ 484,341
2.01 - 4.00% [Member]
Deposits [Line Items]
Weighted Average Interest Rate, Certificates of deposit	2.19%	2.26%
Certificates of deposit	$ 50,765	$ 28,328

Deposits - Scheduled Maturities

Deposits - Scheduled Maturities of Certificates of Deposit (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Fees And Commissions [Abstract]
2,018	$ 291,086
2,019	121,643
2,020	57,124
2,021	14,577
2,022	26,467
Total	$ 510,897

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fees And Commissions [Abstract]
Brokered deposits Total	$ 139,736,000	$ 198,600,000
Aggregate amount of time certificates of deposit	71,073,000	$ 29,478,000
Aggregate amount of time certificates of deposit with a minimum denomination	$ 250,000

Deposits - Scheduled Maturiti77

Deposits - Scheduled Maturities of Certificates of Deposit in Denominations (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Fees And Commissions [Abstract]
Within three months	$ 11,082
Three through six months	26,824
Six through twelve months	14,803
Over twelve months	18,364
Total	$ 71,073

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Debt Disclosure [Abstract]
Short-term borrowings	$ 137,446,000	$ 129,460,000
Advances on line of credit with the FHLB	10,000,000	$ 0
Line of credit with the FHLB	150,000,000
Borrowing limit	$ 612,100,000

Short-Term Borrowings - Schedul

Short-Term Borrowings - Schedule of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Debt Disclosure [Abstract]
Balance at year-end	$ 137,466	$ 129,460	$ 91,339
Maximum amount outstanding at any month-end	185,201	182,636	132,533
Average balance outstanding during the year	$ 147,765	$ 120,590	$ 115,006
Weighted-average interest rate:
As of year-end	1.36%	0.64%	0.40%
Paid during the year	0.98%	0.55%	0.37%

Other Borrowings - Contractual

Other Borrowings - Contractual Maturities of FHLB Long-term Advances (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Federal Home Loan Bank Advances [Line Items]
Advances from Federal Home Loan Banks	$ 174,168	$ 230,601
Convertible [Member]
Federal Home Loan Bank Advances [Line Items]
Maturity Range From	2,018
Maturity Range To	2,018
Advances from Federal Home Loan Banks	$ 5,000	5,000
Convertible [Member] | Weighted-Average [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	3.30%
Convertible [Member] | Minimum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	3.30%
Convertible [Member] | Maximum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	3.30%
Fixed Rate [Member]
Federal Home Loan Bank Advances [Line Items]
Maturity Range From	2,017
Maturity Range To	2,020
Advances from Federal Home Loan Banks	$ 75,601	98,851
Fixed Rate [Member] | Weighted-Average [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	1.68%
Fixed Rate [Member] | Minimum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	0.89%
Fixed Rate [Member] | Maximum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	2.85%
Mid-Term [Member]
Federal Home Loan Bank Advances [Line Items]
Maturity Range From	2,017
Maturity Range To	2,019
Advances from Federal Home Loan Banks	$ 93,567	$ 126,750
Mid-Term [Member] | Weighted-Average [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	1.29%
Mid-Term [Member] | Minimum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	0.76%
Mid-Term [Member] | Maximum [Member]
Federal Home Loan Bank Advances [Line Items]
Interest Rate	1.66%

Other Borrowings - Maturities o

Other Borrowings - Maturities of FHLB Long-term Advances (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2017, Amount	$ 89,075
2018, Amount	70,247
2019, Amount	11,746
2020, Amount	3,100
Total, Amount	$ 174,168	$ 230,601
2017, Weighted-Average Rate	1.29%
2018, Weighted-Average Rate	1.78%
2019, Weighted-Average Rate	1.70%
2020, Weighted-Average Rate	1.57%
Weighted-Average [Member]
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Total, Weighted-Average Rate	1.52%

Other Borrowings - Additional I

Other Borrowings - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017USD ($)Note
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Note payable | $	$ 5,000,000
Number of convertible notes | Note	1

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal									$ 837	$ 3,456	$ 2,154
State											16
Total current taxes									837	3,456	2,170
Deferred income tax benefit									754	(873)	784
Actual tax expense and effective rate, Amount	$ 540	$ 448	$ 203	$ 400	$ 499	$ 792	$ 726	$ 566	$ 1,591	$ 2,583	$ 2,954

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Significant Portions of the Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Deferred tax assets:
Allowance for loan losses	$ 3,184	$ 3,079
Adjustment to record funded status of pension plan	324	3,134
Investment losses subject to Section 382 limitation	4,562	5,018
Purchase accounting adjustment	341	49
Net unrealized loss on securities	478
Deferred compensation	631	643
Other real estate owned	273	293
Nonaccrual interest	223	332
Other	3,385	3,669
Total gross deferred tax assets	13,401	16,217
Deferred tax liabilities:
Pension plan	924	998
Net unrealized gain on securities		2,036
Mortgage servicing rights	80	93
Premises and equipment	12	218
Net unrealized gain on derivatives	413	102
Other	1,550	885
Total gross deferred tax liabilities	2,979	4,332
Net deferred tax assets	$ 10,422	$ 11,885

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 0
Uncertain tax position	$ 0
Effective income tax rate	11.50%
Retained earnings	$ 4,600,000
Provision for federal income tax	$ 0

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of the Federal Statutory Rate and the Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Provision at statutory rate, Amount									$ 3,036	$ 3,505	$ 4,333
Income from bank-owned life insurance, Amount									(351)	(319)	(318)
Tax-exempt income, Amount									(843)	(826)	(752)
Low-income housing credits, Amount									(197)	(226)	(254)
Nondeductible merger expenses, Amount										89	21
Other, net, Amount									(54)	360	(76)
Actual tax expense and effective rate, Amount	$ 540	$ 448	$ 203	$ 400	$ 499	$ 792	$ 726	$ 566	$ 1,591	$ 2,583	$ 2,954
Provision at statutory rate, Percentage of pretax income									34.00%	34.00%	34.00%
Income from bank-owned life insurance, Percentage of pretax income									(3.90%)	(3.10%)	(2.50%)
Tax-exempt income, Percentage of pretax income									(9.50%)	(8.00%)	(5.90%)
Low-income housing credits, Percentage of pretax income									(2.20%)	(2.20%)	(2.00%)
Nondeductible merger expenses, Percentage of pretax income										0.90%	0.20%
Other, net, Percentage of pretax income									(0.60%)	3.50%	(0.60%)
Actual tax expense and effective rate, Percentage of pretax income									17.80%	25.10%	23.20%

Commitments and Contingent Li87

Commitments and Contingent Liabilities - Components of Off Balance Sheet Commitments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off balance sheet commitments	$ 2,810	$ 3,187
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off balance sheet commitments	67,265	82,223
Unfunded Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off balance sheet commitments	$ 77,390	$ 59,620

Commitments and Contingent Li88

Commitments and Contingent Liabilities - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
Interest Rate, Fixed Rate Commitments Minimum	2.60%
Interest Rate, Fixed Rate Commitments Maximum	6.25%
Contract Maturity Period	Less than one year
Coverage Period for Instrument	1 year
Reserve balance	$ 1,200,000
Amount the plaintiff seeks from the bank	1,325,000
Estimate of possible loss to the bank	$ 125,000

Lease Commitments and Total R89

Lease Commitments and Total Rental Expense - Future Minimum Lease Payments By Year and in the Aggregate (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,018	$ 920
2,019	780
2,020	706
2,021	515
2,022	351
2023 and beyond	946
Total	$ 4,218

Lease Commitments and Total R90

Lease Commitments and Total Rental Expense - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)Office	Sep. 30, 2015USD ($)
Commitments And Contingencies Disclosure [Abstract]
Total rental expenses | $	$ 1,300,000	$ 1,300,000	$ 917,000
Number of offices | Office		6

Employee Benefits - Additional

Employee Benefits - 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	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs Disclosure [Line Items]
Service Period								1 year
Age of Employee								21 years
Acquired Shares of the Company's Stock								1,358,472
Outstanding loan interest								3.75%
Annual payment of principal and interest								$ 718,000
Recognized ESOP expense								$ 686,000	$ 612,000	$ 561,000
Stock option granted								0
Option vesting period								5 years
Option expiration period								10 years
Share-based compensation expense								$ 331,000	192,000	113,000
Defined benefit plan curtailment								4,579,000
Reduction in accumulated other comprehensive loss								3,022,000,000
Accumulated benefit obligation								18,598,000	20,361,000
Estimated net loss								0
Expected contribution of bank								0
Allocated share based compensation expense								$ 251,000
Supplemental executive retirement plan minimum period								No less than 192 months
Estimated present value of benefits under plan								$ 1,600,000	1.2
Supplemental executive retirement plan discounting rate for present value calculation								6.00%
Expense related to supplemental executive retirement plan								$ 447,000	413,000	0
Equity [Member]
Compensation Related Costs Disclosure [Line Items]
Target allocation of cash and fixed income								65.00%
Cash and Fixed Income [Member]
Compensation Related Costs Disclosure [Line Items]
Target allocation of cash and fixed income								35.00%
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
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								$ 318,000	$ 193,000	$ 95,000
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
Restricted Stock [Member] | 2015 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								40 months
Outstanding nonvested restricted stock								82,000
Remaining vesting periods								1 year
Restricted Stock [Member] | March 4, 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period								43 months
Restricted Stock [Member] | December 13, 2016 [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
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
Restricted Stock [Member] | March 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Outstanding nonvested restricted stock								170,000
Remaining vesting periods								2 years
Restricted Stock [Member] | December 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Outstanding nonvested restricted stock								268,000
Remaining vesting periods								3 years
Restricted Stock [Member] | March 2017 [Member] | Tranche One [Member]
Compensation Related Costs Disclosure [Line Items]
Outstanding nonvested restricted stock								16,000
Expected future expense								$ 1,296
Remaining vesting periods								3 years
Expected future expense								$ (1,296)
Restricted Stock [Member] | March 2017 [Member] | Tranche Two [Member]
Compensation Related Costs Disclosure [Line Items]
Outstanding nonvested restricted stock								19,000
Expected future expense								$ 2,000
Remaining vesting periods								1 year
Expected future expense								$ (2,000)
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

Employee Benefits - Components

Employee Benefits - Components of the ESOP Shares (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Compensation Related Costs [Abstract]
Allocated shares	359,711	361,308
Shares committed to be released	33,962	33,962
Unreleased shares	871,686	916,968
Total ESOP shares	1,265,359	1,312,238
Fair value of unreleased shares	$ 13,685	$ 12,682

Employee Benefits - Schedule of

Employee Benefits - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 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	611,341
Number of Stock Options, Forfeited	0
Number of Stock Options, Outstanding, September 30, 2017	294,646	905,987
Number of Stock Options, Exercisable at year-end	294,646
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, September 30, 2017	12.35	$ 12.35
Weighted-average Exercise Price, Exercisable at year-end	$ 12.35
Weighted-average Remaining Contractual Term (in years), Outstanding	8 months 2 days	1 year 8 months 2 days
Weighted-average Remaining Contractual Term (in years), Granted	0 years
Weighted-average Remaining Contractual Term (in years), Exercised	8 months 2 days
Weighted-average Remaining Contractual Term (in years), Forfeited	0 years
Weighted-average Remaining Contractual Term (in years), Exercisable	8 months 2 days
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	987	$ 1,341
Aggregate Intrinsic Value, Exercisable at year-end	$ 987

Employee Benefits - Schedule 94

Employee Benefits - Schedule of Nonvested Restricted Stock Option Activity (Detail) - Restricted Stock [Member]	12 Months Ended
	Sep. 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	(21,175)
Number of Restricted Stock, Nonvested at September 30, 2017 | shares	34,692
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	13.62
Weighted-average Grant Date Fair Value, Nonvested at September 30, 2017 | $ / shares	$ 14.89

Employee Benefits - Summary of

Employee Benefits - Summary of Change in Plan Assets and Benefit Obligation (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs [Abstract]
Projected benefit obligation at beginning of year	$ 25,470,000	$ 22,093,000
Service cost	516,000	987,000	$ 873,000
Interest cost	859,000	972,000	826,000
Actuarial (gains) losses	(2,857,000)	2,012,000
Curtailment (Plan Freeze)	(4,579,000)
Benefits paid	(811,000)	(594,000)
Projected benefit obligation at end of year	18,598,000	25,470,000	22,093,000
Fair value of plan assets at beginning of year	19,188,000	17,507,000
Actual return on plan assets	1,986,000	1,644,000
Contributions		631,000
Benefits paid	(811,000)	(594,000)
Fair value of plan assets at end of year	20,363,000	19,188,000	$ 17,507,000
Funded status	$ 1,765,000	$ (6,282,000)

Employee Benefits - Summary o96

Employee Benefits - Summary of the Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs [Abstract]
Net loss	$ 953	$ 9,216	$ 8,068

Employee Benefits - Summary o97

Employee Benefits - Summary of the Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs [Abstract]
Service cost	$ 516	$ 987	$ 873
Interest cost	859	972	826
Expected return on plan assets	(1,385)	(1,244)	(1,233)
Amortization of unrecognized loss	226	463	241
Net periodic benefit cost	$ 216	$ 1,178	$ 707

Employee Benefits - Schedule 98

Employee Benefits - Schedule of Weighted-Average Assumptions (Detail)	Sep. 30, 2017	Sep. 30, 2016
Compensation Related Costs [Abstract]
Discount rate	3.85%	3.70%
Rate of compensation increase		3.00%

Employee Benefits - Schedule 99

Employee Benefits - Schedule of Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Compensation Related Costs [Abstract]
Discount rate	4.10%	4.45%	4.45%
Expected long-term return on plan assets	7.00%	7.00%	7.00%
Rate of compensation increase		4.00%	4.00%

Employee Benefits - Summary 100

Employee Benefits - Summary of the Plan's Financial Assets at Fair Value, Within the Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 20,363	$ 19,188
Level II [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	20,363	19,188
Investment in Collective Trusts Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	7,999	7,654
Investment in Collective Trusts Fixed Income [Member] | Level II [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	7,999	7,654
Investment in Collective Trusts Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	12,353	11,502
Investment in Collective Trusts Equity [Member] | Level II [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	12,353	11,502
Investment in Short-Term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	11	32
Investment in Short-Term Investments [Member] | Level II [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 11	$ 32

Employee Benefits - The Bank's

Employee Benefits - The Bank's Defined Benefit Pension Plan Weighted-Average Asset Allocations (Detail)	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Total Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Defined Benefit Plan, Actual Plan Asset Allocations	39.30%	39.90%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Defined Benefit Plan, Actual Plan Asset Allocations	60.70%	59.90%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Defined Benefit Plan, Actual Plan Asset Allocations	0.00%	0.20%

Employee Benefits - Summary 102

Employee Benefits - Summary of Estimated Future Benefit Payments (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Compensation Related Costs [Abstract]
2,018	$ 1,109
2,019	851
2,020	2,949
2,021	3,181
2,022	556
2023-2027	$ 5,691

Regulatory Restrictions - Addit

Regulatory Restrictions - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Sep. 30, 2016
Regulatory Capital Requirements [Abstract]
Reserve funds deposit	$ 15,228,000	$ 10,523,000

Regulatory Capital Requireme104

Regulatory Capital Requirements - Additional Information (Detail)	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital ratio	4.50%	4.50%
Tier 1 risk-based ratio	6.00%	6.00%	4.00%
Capital conservation buffer percentage	2.50%
Risk weight percentage	150.00%		100.00%
Total risk-based ratio	10.00%	10.00%
Common equity Tier 1 capital ratio	6.50%	6.50%
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 risk-based ratio	8.00%	8.00%
Total risk-based ratio	10.00%	10.00%
Common equity Tier 1 capital ratio	6.50%	6.50%
Tier 1 leverage capital ratio	5.00%	5.00%

Regulatory Capital Requireme105

Regulatory Capital Requirements - Reconciliation of Bank's Capital under U.S. Generally Accepted Accounting Principles to Regulatory Capital (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders’ equity	$ 182,727	$ 176,344	$ 171,280	$ 167,309
Accumulated other comprehensive loss	(754)	(1,832)
Total risk-based capital	170,325	162,276
ESSA Bank and Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total stockholders’ equity	175,127	166,327
Accumulated other comprehensive loss	754	1,832
Goodwill and certain other intangible assets	(15,276)	(15,294)
Tier I, common equity and core capital	160,605	152,865
Allowance for loan losses and off-balance sheet commitments	9,720	9,411
Total risk-based capital	$ 170,325	$ 162,276

Regulatory Capital Requireme106

Regulatory Capital Requirements - Bank's Actual Capital Ratios (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2014
Fees And Commissions [Abstract]
Actual, Amount	$ 170,325	$ 162,276
For capital adequacy purposes, Amount	97,458	94,548
To be well capitalized, Amount	121,822	118,186
Actual, Amount	160,605	152,865
For capital adequacy purposes, Amount	73,093	70,911
To be well capitalized, Amount	97,458	94,548
Actual, Amount	160,605	152,865
For capital adequacy purposes, Amount	54,820	53,183
To be well capitalized, Amount	79,184	76,821
Actual, Amount	160,605	152,865
For capital adequacy purposes, Amount	69,878	69,811
To be well capitalized, Amount	$ 87,247	$ 87,264
Actual, Ratio	14.00%	13.70%
For capital adequacy purposes, Ratio	8.00%	8.00%
To be well capitalized, Ratio	10.00%	10.00%
Actual, Ratio	13.20%	12.90%
For capital adequacy purposes, Ratio	6.00%	6.00%	4.00%
To be well capitalized, Ratio	8.00%	8.00%
Actual, Ratio	13.20%	12.90%
For capital adequacy purposes, Ratio	4.50%	4.50%
To be well capitalized, Ratio	6.50%	6.50%
Actual, Ratio	9.20%	8.80%
For capital adequacy purposes, Ratio	4.00%	4.00%
To be well capitalized, Ratio	5.00%	5.00%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Securities, Real Estate Owned and Impaired Loans Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Investment securities available for sale:
Available for sale, Fair Value	$ 390,452	$ 390,410
Derivatives and hedging activities:	1,215	453
Foreclosed real estate owned	1,424	2,659
Impaired loans	15,231	22,218
Mortgage servicing rights	232	398
Fair Value, Measurements, Nonrecurring [Member]
Investment securities available for sale:
Foreclosed real estate owned	1,424	2,659
Level I [Member]
Investment securities available for sale:
Available for sale, Fair Value	25	25
Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	383,203	382,900
Derivatives and hedging activities:	1,215	453
Level III [Member]
Investment securities available for sale:
Available for sale, Fair Value	7,224	7,485
Impaired loans	15,231	22,218
Mortgage servicing rights	232	398
Level III [Member] | Fair Value, Measurements, Nonrecurring [Member]
Investment securities available for sale:
Foreclosed real estate owned	1,424	2,659
Mortgage-Backed Securities [Member]
Investment securities available for sale:
Available for sale, Fair Value	233,823	219,162
Mortgage-Backed Securities [Member] | Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	233,823	219,162
Obligations of States and Political Subdivisions [Member]
Investment securities available for sale:
Available for sale, Fair Value	65,358	73,690
Obligations of States and Political Subdivisions [Member] | Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	65,358	73,690
U.S. Government Agency Securities [Member]
Investment securities available for sale:
Available for sale, Fair Value	18,671	25,941
U.S. Government Agency Securities [Member] | Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	18,671	25,941
Corporate Obligations [Member]
Investment securities available for sale:
Available for sale, Fair Value	48,742	38,418
Corporate Obligations [Member] | Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	41,518	31,433
Corporate Obligations [Member] | Level III [Member]
Investment securities available for sale:
Available for sale, Fair Value	7,224	6,985
Other Debt Securities [Member]
Investment securities available for sale:
Available for sale, Fair Value	23,833	33,174
Other Debt Securities [Member] | Level II [Member]
Investment securities available for sale:
Available for sale, Fair Value	23,833	32,674
Other Debt Securities [Member] | Level III [Member]
Investment securities available for sale:
Available for sale, Fair Value		500
Equity Securities-Financial Services [Member]
Investment securities available for sale:
Available for sale, Fair Value	25	25
Equity Securities-Financial Services [Member] | Level I [Member]
Investment securities available for sale:
Available for sale, Fair Value	$ 25	$ 25

Fair Value Measurements - Sc108

Fair Value Measurements - Schedule of Changes in Fair Value of Level III Investments (Detail) - Significant Unobservable Inputs (Level 3) [Member] - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 7,485,000	$ 4,211,000
Purchases, sales, issuances, settlements, net		3,292,000
Total unrealized gain:
Included in other comprehensive income	4,000	(18,000)
Transfers into Level III	750,000
Transfers out of Level III	(1,015,000)
Ending balance	$ 7,224,000	$ 7,485,000

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Impaired loans, net fair value	$ 15,600,000	$ 22,600,000
Impaired loans, valuation allowance	345,000	347,000
Level III [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transfers into Level III	750,000
Transfers out of Level III	$ 1,015,000
Transferred into or out of Level III investments		$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 20,363	$ 19,188
Unobservable Input	Prepayment speeds	Prepayment speeds
Fair value input appraisal adjustments	(15.90%)	(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	42.00%	33.00%
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 15,231	$ 22,218
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	(24.00%)	(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	$ 1,424	$ 2,659
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	(22.10%)	(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	46.00%	50.00%
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 232	$ 398
Unobservable Input	Discount rate	Discount rate
Fair value input appraisal adjustments	(11.00%)	(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%	12.00%

Fair Value of Financial Inst111

Fair Value of Financial Instruments - Schedule of Fair Values of the Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Financial assets:
Investment and mortgage-backed securities available for sale	$ 390,452	$ 390,410
Loans receivable, net	15,600	22,600
Mortgage servicing rights	232	398
Derivatives	1,215	453
Bank-owned life insurance	37,626	36,593
Financial liabilities:
Other borrowings	174,168	230,601
Advances by borrowers for taxes and insurance	5,163	4,956
Level I [Member]
Financial assets:
Investment and mortgage-backed securities available for sale	25	25
Level II [Member]
Financial assets:
Investment and mortgage-backed securities available for sale	383,203	382,900
Derivatives	1,215	453
Level III [Member]
Financial assets:
Investment and mortgage-backed securities available for sale	7,224	7,485
Mortgage servicing rights	232	398
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	41,683	43,658
Certificates of deposit	500	1,250
Investment and mortgage-backed securities available for sale	390,452	390,410
Loans receivable, net	1,236,681	1,219,213
Accrued interest receivable	6,149	5,769
Regulatory stock	13,832	15,463
Mortgage servicing rights	232	398
Derivatives	1,215	453
Bank-owned life insurance	37,626	36,593
Financial liabilities:
Deposits	1,274,861	1,214,820
Short-term borrowings	137,446	129,460
Other borrowings	174,168	230,601
Advances by borrowers for taxes and insurance	5,163	4,956
Accrued interest payable	1,043	1,046
Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	41,683	43,658
Certificates of deposit	505	1,269
Investment and mortgage-backed securities available for sale	390,452	390,410
Loans receivable, net	1,235,368	1,237,759
Accrued interest receivable	6,149	5,769
Regulatory stock	13,832	15,463
Mortgage servicing rights	232	398
Derivatives	1,215	453
Bank-owned life insurance	37,626	36,593
Financial liabilities:
Deposits	1,275,356	1,218,894
Short-term borrowings	137,446	129,460
Other borrowings	174,107	231,911
Advances by borrowers for taxes and insurance	5,163	4,956
Accrued interest payable	1,043	1,046
Estimated Fair Value [Member] | Level I [Member]
Financial assets:
Cash and cash equivalents	41,683	43,658
Investment and mortgage-backed securities available for sale	25	25
Accrued interest receivable	6,149	5,769
Regulatory stock	13,832	15,463
Bank-owned life insurance	37,626	36,593
Financial liabilities:
Deposits	763,964	702,151
Short-term borrowings	137,446	129,460
Advances by borrowers for taxes and insurance	5,163	4,956
Accrued interest payable	1,043	1,046
Estimated Fair Value [Member] | Level II [Member]
Financial assets:
Investment and mortgage-backed securities available for sale	383,203	382,900
Derivatives	1,215	453
Estimated Fair Value [Member] | Level III [Member]
Financial assets:
Certificates of deposit	505	1,269
Investment and mortgage-backed securities available for sale	7,224	7,485
Loans receivable, net	1,235,368	1,237,759
Mortgage servicing rights	232	398
Financial liabilities:
Deposits	511,392	516,743
Other borrowings	$ 174,107	$ 231,911

Accumulated Other Comprehens112

Accumulated Other Comprehensive Income (Loss) - Summary of Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	$ 176,344	$ 171,280	$ 167,309
Pension plan curtailment	4,579
Total other comprehensive income	1,078	563	184
Ending Balance	182,727	176,344	171,280
Defined Benefit Pension Plan [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(6,083)	(5,325)	(3,228)
Other comprehensive income before reclassifications and pension plan curtailment	2,284
Pension plan curtailment	3,022
Amounts reclassified from accumulated other comprehensive loss	149	306	159
Total other comprehensive income	5,455	(758)	(2,097)
Ending Balance	(628)	(6,083)	(5,325)
Other comprehensive income before reclassifications		(1,064)	(2,256)
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	3,952	2,930	649
Other comprehensive income before reclassifications and pension plan curtailment	(4,684)
Amounts reclassified from accumulated other comprehensive loss	(195)	(831)	(518)
Total other comprehensive income	(4,879)	1,022	2,281
Ending Balance	(927)	3,952	2,930
Other comprehensive income before reclassifications		1,853	2,799
Derivatives [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	299
Other comprehensive income before reclassifications and pension plan curtailment	505
Amounts reclassified from accumulated other comprehensive loss	(3)	15
Total other comprehensive income	502	299
Ending Balance	801	299
Other comprehensive income before reclassifications		284
Accumulated Other Comprehensive Loss [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(1,832)	(2,395)	(2,579)
Other comprehensive income before reclassifications and pension plan curtailment	(1,895)
Pension plan curtailment	3,022
Amounts reclassified from accumulated other comprehensive loss	(49)	(510)	(359)
Total other comprehensive income	1,078	563	184
Ending Balance	$ (754)	(1,832)	(2,395)
Other comprehensive income before reclassifications		$ 1,073	$ 543

Accumulated Other Comprehens113

Accumulated Other Comprehensive Income (Loss) - Summary of Activity in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Related income tax expense or benefit	34.00%	34.00%	34.00%

Accumulated Other Comprehens114

Accumulated Other Comprehensive Income (Loss) - Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Gain on sale of investments, net									$ 295	$ 1,258	$ 786
Interest expense	$ (3,458)	$ (3,248)	$ (3,075)	$ (3,018)	$ (2,969)	$ (2,864)	$ (2,875)	$ (2,723)	(12,799)	(11,431)	(10,390)
Income taxes	$ (540)	$ (448)	$ (203)	$ (400)	$ (499)	$ (792)	$ (726)	$ (566)	(1,591)	(2,583)	(2,954)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Net of tax									49	510	359
Unrealized Gains (Losses) on Securities Available for Sale [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on sale of investments, net									295	1,258	786
Income taxes									(100)	(427)	(268)
Net of tax									195	831	518
Defined Benefit Pension Plan [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Income taxes									77	157	82
Net of tax									(149)	(306)	(159)
Compensation and employee benefits									(226)	(463)	$ (241)
Derivatives [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest expense									5	(23)
Income taxes									(2)	8
Net of tax									$ 3	$ (15)

Derivatives And Hedging Acti115

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	Sep. 30, 2017	Sep. 30, 2016
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 1,215	$ 453
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 1,215	$ 453

Derivatives And Hedging Acti116

Derivatives And Hedging Activities - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)Contract	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Increase (decrease) in accrued interest payable		$ (3,000)	$ 116,000	$ 35,000
Termination value of derivatives		0
Debt Instrument, collateral amount		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]
Other non-interest income		$ 5,000
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
Derivative, notional principal amount		$ 75,000,000

Derivatives And Hedging Acti117

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	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments Gain Loss [Line Items]
Gain Recognized in OCI on Derivative (Effective Portion)	$ 911	$ 430
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	5
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(23)
Interest Rate Products [Member]
Derivative Instruments Gain Loss [Line Items]
Gain Recognized in OCI on Derivative (Effective Portion)	911	430
Interest Rate Products [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 5
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		$ (23)

Parent Company - Condensed Bala

Parent Company - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
ASSETS
Cash and due from banks	$ 36,008	$ 31,815
Investment securities available for sale	390,452	390,410
Premises and equipment, net	16,234	16,844
Other assets	20,719	18,216
TOTAL ASSETS	1,785,218	1,772,479
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other liabilities	10,853	16,298
Stockholders’ equity	182,727	176,344	$ 171,280	$ 167,309
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	1,785,218	1,772,479
Parent Company [Member]
ASSETS
Cash and due from banks	5,034	7,176
Investment securities available for sale	25	25
Investment in subsidiary	175,127	166,327
Premises and equipment, net	1,093	1,118
Other assets	1,577	1,792
TOTAL ASSETS	182,856	176,438
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other liabilities	129	94
Stockholders’ equity	182,727	176,344
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 182,856	$ 176,438

Parent Company - Condensed Stat

Parent Company - Condensed Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
INCOME
Interest income	$ 11,423	$ 11,160	$ 11,304	$ 11,632	$ 11,700	$ 11,859	$ 12,284	$ 11,092	$ 45,519	$ 46,935	$ 43,789
EXPENSES
Professional fees									2,886	2,529	1,983
Other									3,723	4,354	3,804
Total noninterest expense	10,212	10,320	10,504	10,402	11,315	10,651	11,106	9,786	41,438	42,858	36,865
Income (loss) before income tax expense	2,549	2,210	1,834	2,337	2,028	2,904	2,855	2,523
Income tax benefit	540	448	203	400	499	792	726	566	1,591	2,583	2,954
NET INCOME	$ 2,009	$ 1,762	$ 1,631	$ 1,937	$ 1,529	$ 2,112	$ 2,129	$ 1,957	7,339	7,727	9,791
COMPREHENSIVE INCOME									8,417	8,290	9,975
Parent Company [Member]
INCOME
Interest income									426	383	376
Dividends										34,000	8,000
Total income									426	34,383	8,376
EXPENSES
Professional fees									455	860	755
Other									51	50	64
Total noninterest expense									506	910	819
Income (loss) before income tax expense									(80)	33,473	7,557
Income tax benefit									(27)	(91)	(118)
Income (loss) before equity in undistributed net earnings of subsidiary									(53)	33,564	7,675
Equity in undistributed net earnings of subsidiary									7,392	(25,837)	2,116
NET INCOME									7,339	7,727	9,791
COMPREHENSIVE INCOME									$ 8,417	$ 8,290	$ 9,975

Parent Company - Condensed S120

Parent Company - Condensed Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 2,009	$ 1,762	$ 1,631	$ 1,937	$ 1,529	$ 2,112	$ 2,129	$ 1,957	$ 7,339	$ 7,727	$ 9,791
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for depreciation									1,305	1,661	1,326
(Increase) decrease in accrued interest receivable									380	516	7
Deferred federal income taxes									754	(158)	784
Other, net									2,480	2,780	3,295
Net cash provided by operating activities									19,482	18,159	19,336
INVESTING ACTIVITIES
Purchase of premises, equipment and software									(645)	(1,098)	(878)
Net cash (used for) provided by investing activities									(30,207)	4,674	(40,366)
FINANCING ACTIVITIES
Purchase of treasury stock shares										(301)	(3,132)
Proceeds from the exercise of stock options									779	18
Dividends on common stock									(3,830)	(3,747)	(3,546)
Net cash provided by (used for) financing activities									8,750	2,067	17,487
(Decrease) increase in cash and cash equivalents									(1,975)	24,900	(3,543)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				43,658				18,758	43,658	18,758	22,301
CASH AND CASH EQUIVALENTS AT END OF YEAR	41,683				43,658				41,683	43,658	18,758
Parent Company [Member]
OPERATING ACTIVITIES
Net income									7,339	7,727	9,791
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net earnings of subsidiary									(7,391)	25,837	(2,116)
Provision for depreciation									25	26	24
(Decrease) increase in accrued income taxes									(34)	(369)	40
(Increase) decrease in accrued interest receivable									1	(13)	8
Deferred federal income taxes									(5)	3	(3)
Other, net									974	(60)	458
Net cash provided by operating activities									909	33,151	8,202
INVESTING ACTIVITIES
Certificate of deposit maturities											17
Acquisition and additional capitalization of subsidiary, net of cash acquired										(24,203)
Purchase of premises, equipment and software											(41)
Net cash (used for) provided by investing activities										(24,203)	(24)
FINANCING ACTIVITIES
Purchase of treasury stock shares										(301)	(3,132)
Proceeds from the exercise of stock options									779	18
Dividends on common stock									(3,830)	(3,747)	(3,546)
Net cash provided by (used for) financing activities									(3,051)	(4,030)	(6,678)
(Decrease) increase in cash and cash equivalents									(2,142)	4,918	1,500
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				$ 7,176				$ 2,258	7,176	2,258	758
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 5,034				$ 7,176				$ 5,034	$ 7,176	$ 2,258

Selected Quarterly Data (Una121

Selected Quarterly Data (Unaudited) - Summary of Selected Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Total interest income	$ 14,881	$ 14,408	$ 14,379	$ 14,650	$ 14,669	$ 14,723	$ 15,159	$ 13,815	$ 58,318	$ 58,366	$ 54,179
Total interest expense	3,458	3,248	3,075	3,018	2,969	2,864	2,875	2,723	12,799	11,431	10,390
NET INTEREST INCOME	11,423	11,160	11,304	11,632	11,700	11,859	12,284	11,092	45,519	46,935	43,789
Provision for loan losses	1,100	750	750	750	750	600	600	600	3,350	2,550	2,075
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	10,323	10,410	10,554	10,882	10,950	11,259	11,684	10,492	42,169	44,385	41,714
Total noninterest income	2,438	2,120	1,784	1,857	2,393	2,296	2,277	1,817	8,199	8,783	7,896
Total noninterest expense	10,212	10,320	10,504	10,402	11,315	10,651	11,106	9,786	41,438	42,858	36,865
Income (loss) before income tax expense	2,549	2,210	1,834	2,337	2,028	2,904	2,855	2,523
Income taxes expense (benefit)	540	448	203	400	499	792	726	566	1,591	2,583	2,954
NET INCOME	$ 2,009	$ 1,762	$ 1,631	$ 1,937	$ 1,529	$ 2,112	$ 2,129	$ 1,957	$ 7,339	$ 7,727	$ 9,791
Net income
Basic	$ 0.19	$ 0.16	$ 0.15	$ 0.18	$ 0.15	$ 0.20	$ 0.20	$ 0.19	$ 0.69	$ 0.74	$ 0.94
Diluted	$ 0.19	$ 0.16	$ 0.15	$ 0.18	$ 0.14	$ 0.20	$ 0.20	$ 0.19	$ 0.69	$ 0.73	$ 0.93
Average shares outstanding
Basic	10,704,554	10,678,856	10,592,997	10,475,032	10,456,404	10,426,304	10,385,154	10,364,425	10,601,733	10,398,488	10,454,456
Diluted	10,766,159	10,743,008	10,691,960	10,604,072	10,579,314	10,553,138	10,524,697	10,535,573	10,663,457	10,519,068	10,543,130

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - Eagle National Bancorp, Inc [Member] $ in Thousands	Dec. 04, 2015USD ($)Branch
Business Acquisition [Line Items]
Date of acquisition	Dec. 4, 2015
Number of branches acquired | Branch	5
Total purchase price related to acquisition	$ 24,655
Acquired credit impaired loans	3,500
Credit impaired loans, nonaccretable difference amount	2,000
Loan portfolio without evidence of deterioration	120,700
Fair value of loan portfolio	$ 121,400

Acquisitions - Condensed Statem

Acquisitions - Condensed Statement Reflecting Values Assigned to Net Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Dec. 04, 2015	Sep. 30, 2015
Net assets acquired:
Goodwill resulting from ENB merger	$ 13,801	$ 13,801		$ 10,259
Eagle National Bancorp, Inc [Member]
Business Acquisition [Line Items]
Total purchase price			$ 24,655
Net assets acquired:
Cash			8,481
Investments available for sale			36,275
Loans receivable			123,380
Regulatory Stock			889
Premises and equipment, net			945
Intangible assets			1,491
Deferred tax assets			715
Other assets			2,174
Certificates of deposits			(32,408)
Deposits other than certificates of deposits			(119,865)
Other liabilities			(964)
Net Cash acquired			21,113
Goodwill resulting from ENB merger			$ 3,542

Acquisitions - Pro Forma Select

Acquisitions - Pro Forma Selected Information (Detail) - Eagle National Bancorp, Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Net interest income	$ 45,519	$ 48,321	$ 50,238
Noninterest income	8,199	8,866	8,628
Net	$ 7,339	$ 6,077	$ 9,804
Basic	$ 0.69	$ 0.58	$ 0.94
Diluted	$ 0.69	$ 0.58	$ 0.93