ESSA Bancorp (ESSA) 10-Q 9 Aug 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2018	Aug. 03, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	ESSA
Entity Registrant Name	ESSA Bancorp, Inc.
Entity Central Index Key	1,382,230
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,790,596

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
ASSETS
Cash and due from banks	$ 32,750	$ 36,008
Interest-bearing deposits with other institutions	5,157	5,675
Total cash and cash equivalents	37,907	41,683
Certificates of deposit	500	500
Investment securities available for sale, at fair value	371,109	390,452
Loans receivable (net of allowance for loan losses of $11,130 and $9,365)	1,301,589	1,236,681
Regulatory stock, at cost	16,597	13,832
Premises and equipment, net	15,080	16,234
Bank-owned life insurance	38,380	37,626
Foreclosed real estate	1,368	1,424
Intangible assets, net	1,463	1,844
Goodwill	13,801	13,801
Deferred income taxes	8,605	10,422
Other assets	20,875	20,719
TOTAL ASSETS	1,827,274	1,785,218
LIABILITIES
Deposits	1,269,866	1,274,861
Short-term borrowings	220,006	137,446
Other borrowings	131,119	174,168
Advances by borrowers for taxes and insurance	14,802	5,163
Other liabilities	12,671	10,853
TOTAL LIABILITIES	1,648,464	1,602,491
STOCKHOLDERS’ EQUITY
Preferred Stock ($0.01 par value; 10,000,000 shares authorized, none issued)
Common stock ($0.01 par value; 40,000,000 shares authorized, 18,133,095 issued; 11,790,596 and 11,596,263 outstanding at June 30, 2018 and September 30, 2017, respectively)	181	181
Additional paid in capital	180,537	180,764
Unallocated common stock held by the Employee Stock Ownership Plan (ESOP)	(8,372)	(8,720)
Retained earnings	92,011	91,147
Treasury stock, at cost; 6,342,499 and 6,536,832 shares outstanding at June 30, 2018 and September 30, 2017, respectively	(77,512)	(79,891)
Accumulated other comprehensive loss	(8,035)	(754)
TOTAL STOCKHOLDERS’ EQUITY	178,810	182,727
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,827,274	$ 1,785,218

Consolidated Balance Sheet (Un3

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Statement Of Financial Position [Abstract]
Allowance for loan losses	$ 11,130	$ 9,365
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	11,790,596	11,596,263
Treasury stock, shares outstanding	6,342,499	6,536,832

Consolidated Statement of Opera

Consolidated Statement of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST INCOME
Loans receivable, including fees	$ 13,968	$ 11,819	$ 39,704	$ 35,869
Investment securities:
Taxable	2,226	2,073	6,470	5,990
Exempt from federal income tax	183	295	756	907
Other investment income	341	221	1,011	671
Total interest income	16,718	14,408	47,941	43,437
INTEREST EXPENSE
Deposits	2,561	2,186	7,297	6,267
Short-term borrowings	992	376	2,527	923
Other borrowings	603	686	1,852	2,151
Total interest expense	4,156	3,248	11,676	9,341
NET INTEREST INCOME	12,562	11,160	36,265	34,096
Provision for loan losses	975	750	3,075	2,250
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	11,587	10,410	33,190	31,846
NONINTEREST INCOME
Service fees on deposit accounts	832	876	2,536	2,553
Services charges and fees on loans	342	285	1,010	912
Trust and investment fees	255	183	732	547
Gain on sale of investments, net		295	75	295
Earnings on Bank-owned life insurance	250	256	754	775
Insurance commissions	200	181	575	577
Other	18	44	129	102
Total noninterest income	1,897	2,120	5,811	5,761
NONINTEREST EXPENSE
Compensation and employee benefits	5,820	6,096	17,728	18,329
Occupancy and equipment	1,049	1,106	3,420	3,387
Professional fees	564	570	1,756	2,150
Data processing	880	908	2,697	2,773
Advertising	331	254	690	800
Federal Deposit Insurance Corporation (FDIC) premiums	234	245	679	645
Loss (Gain) on foreclosed real estate	4	(19)		(120)
Amortization of intangible assets	102	158	381	485
Other	1,179	1,002	3,082	2,777
Total noninterest expense	10,163	10,320	30,433	31,226
Income before income taxes	3,321	2,210	8,568	6,381
Income taxes	500	448	5,122	1,051
NET INCOME	$ 2,821	$ 1,762	$ 3,446	$ 5,330
Earnings per share
Basic	$ 0.26	$ 0.16	$ 0.32	$ 0.50
Diluted	0.26	0.16	0.32	0.50
Dividends per share	$ 0.09	$ 0.09	$ 0.27	$ 0.27

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,821	$ 1,762	$ 3,446	$ 5,330
Investment securities available for sale:
Unrealized holding (loss)gain	(1,741)	1,423	(10,144)	(7,625)
Tax effect	365	(483)	2,380	2,593
Reclassification of gains recognized in net income		(295)	(75)	(295)
Tax effect		100	18	100
Net of tax amount	(1,376)	745	(7,821)	(5,227)
Pension plan adjustment:
Related to freezing pension				7,143
Tax effect				(2,429)
Reclassification of gains recognized in net income		23		182
Tax effect		(11)		(67)
Net of tax amount		12		4,829
Derivative and hedging activities adjustments:
Changes in unrealized holding gains(losses) on derivatives included in net income	249	(231)	1,445	867
Tax effect	(61)	82	(369)	(397)
Reclassification adjustment for gains on derivatives included in net income	(153)	(3)	(252)	3
Tax effect	41	1	62	(1)
Net of tax amount	76	(151)	886	472
Total other comprehensive (loss) income	(1,300)	606	(6,935)	74
Comprehensive income (loss)	$ 1,521	$ 2,368	$ (3,489)	$ 5,404

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - 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, 2016							$ (1,832)
Net income	$ 5,330
Ending Balance at Jun. 30, 2017							(1,758)
Beginning Balance at Mar. 31, 2017							(2,364)
Net income	1,762
Ending Balance at Jun. 30, 2017							(1,758)
Beginning Balance at Sep. 30, 2017	$ 182,727	$ 181	$ 180,764	$ (8,720)	$ 91,147	$ (79,891)	(754)
Beginning Balance, Shares at Sep. 30, 2017	11,596,263	11,596,263
Net income	$ 3,446				3,446
Other comprehensive loss	(6,935)						(6,935)
Reclassification of certain income tax effects from accumulated other comprehensive loss					346		(346)
Cash dividends declared ($0.27 per share)	(2,928)				(2,928)
Stock based compensation	287		287
Allocation of ESOP stock	540		192	348
Allocation of treasury shares to incentive plan			(281)			281
Allocation of treasury shares to incentive plan, Shares		22,994
Stock options exercised	$ 1,673		(425)			2,098
Stock options exercised, Shares	294,646	171,339
Ending Balance at Jun. 30, 2018	$ 178,810	$ 181	180,537	(8,372)	92,011	(77,512)	(8,035)
Ending Balance, Shares at Jun. 30, 2018	11,790,596	11,790,596
Beginning Balance at Mar. 31, 2018							(6,735)
Net income	$ 2,821
Ending Balance at Jun. 30, 2018	$ 178,810	$ 181	$ 180,537	$ (8,372)	$ 92,011	$ (77,512)	$ (8,035)
Ending Balance, Shares at Jun. 30, 2018	11,790,596	11,790,596

Consolidated Statement of Chan7

Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (Parenthetical)	9 Months Ended
	Jun. 30, 2018$ / shares
Cash dividends declared, per share	$ 0.27
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.27

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net income	$ 3,446	$ 5,330
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,075	2,250
Provision for depreciation and amortization	890	997
Amortization and accretion of discounts and premiums, net	3,250	3,387
Net gain on sale of investment securities	(75)	(295)
Compensation expense on ESOP	540	516
Stock based compensation	287	245
Increase in accrued interest receivable	(116)	(70)
Increase in accrued interest payable	259	143
Earnings on bank-owned life insurance	(754)	(775)
Deferred federal income taxes	3,565	(454)
(Decrease) increase in accrued pension liability	(375)	259
Gain on foreclosed real estate, net		(120)
Amortization of intangible assets	381	485
Other, net	3,833	2,682
Net cash provided by operating activities	18,206	14,580
INVESTING ACTIVITIES
Certificates of deposit maturities		250
Investment securities available for sale:
Proceeds from sale of investment securities	22,074	17,378
Proceeds from principal repayments and maturities	43,065	44,356
Purchases	(57,331)	(67,932)
Increase in loans receivable, net	(70,951)	(11,555)
Redemption of regulatory stock	15,410	16,409
Purchase of regulatory stock	(18,175)	(16,066)
Proceeds from sale of foreclosed real estate	1,165	2,221
Purchase of premises, equipment and software	(139)	(453)
Net cash used for investing activities	(64,882)	(15,392)
FINANCING ACTIVITIES
(Decrease) increase in deposits, net	(4,995)	1,642
Net increase in short-term borrowings	82,560	16,205
Proceeds from other borrowings	38,630	43,057
Repayment of other borrowings	(81,679)	(75,490)
Increase in advances by borrowers for taxes and insurance	9,639	7,257
Exercising of stock options	1,673	910
Dividends on common stock	(2,928)	(2,868)
Net cash provided by (used for) financing activities	42,900	(9,287)
Decrease in cash and cash equivalents	(3,776)	(10,099)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	41,683	43,658
CASH AND CASH EQUIVALENTS AT END OF YEAR	37,907	33,559
Cash Paid:
Interest	11,417	9,198
Income taxes	(2)	(389)
Noncash items:
Transfers from loans to foreclosed real estate	1,109	2,301
Unrealized holding loss	$ (10,219)	(7,920)
Pension Plan curtailment		$ 7,143

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	1. Nature of Operations and Basis of Presentation The consolidated financial statements include the accounts of ESSA Bancorp, Inc. (the “Company”), its wholly owned subsidiary, ESSA Bank & Trust (the “Bank”), and the Bank’s wholly owned subsidiaries, ESSACOR Inc.; Pocono Investments Company; ESSA Advisory Services, LLC; Integrated Financial Corporation; and Integrated Abstract Incorporated, a wholly owned subsidiary of Integrated Financial Corporation. The primary purpose of the Company is to act as a holding company for the Bank. On November 6, 2014, the Company converted its status from a savings and loan holding company to a bank holding company. In addition, the Bank converted from a Pennsylvania-chartered savings association to a Pennsylvania-chartered savings bank. The Bank’s primary business consists of the taking of deposits and granting of loans to customers generally in Monroe, Northampton, Lehigh, Delaware, Chester, Montgomery, Lackawanna, and Luzerne Counties, Pennsylvania. The Bank is subject to regulation and supervision by the Pennsylvania Department of Banking and Securities and the Federal Deposit Insurance Corporation (the “FDIC”). The investment in the Bank on the parent company’s financial statements is carried at the parent company’s equity in the underlying net assets. ESSACOR, Inc. is a Pennsylvania corporation that has been used to purchase properties at tax sales that represent collateral for delinquent loans of the Bank and is currently inactive. Pocono Investment Company is a Delaware corporation formed as an investment company subsidiary to hold and manage certain investments, including certain intellectual property. ESSA Advisory Services, LLC is a Pennsylvania limited liability company owned 100 percent by ESSA Bank & Trust. ESSA Advisory Services, LLC is a full-service insurance benefits consulting company offering group services such as health insurance, life insurance, short-term and long-term disability, dental, vision, and 401(k) retirement planning as well as individual health products. Integrated Financial Corporation is a Pennsylvania corporation that provided investment advisory services to the general public and is currently inactive. Integrated Abstract Incorporated is a Pennsylvania corporation that provided title insurance services and is currently inactive. All significant intercompany accounts and transactions have been eliminated in consolidation. The unaudited consolidated financial statements reflect all adjustments, which in the opinion of management, are necessary for a fair presentation of the results of the interim periods and are of a normal and recurring nature. Operating results for the three and nine month periods ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending September 30, 2018.

Earnings per Share

Earnings per Share	9 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	2. Earnings per Share The following table sets forth the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computation for the three and nine month periods ended June 30, 2018 and 2017. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2018 2017 2018 2017 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,360,627 ) (6,547,695 ) (6,447,516 ) (6,629,264 ) Average unearned ESOP shares (831,689 ) (876,964 ) (843,049 ) (888,324 ) Average unearned non-vested shares (29,310 ) (29,580 ) (43,302 ) (43,801 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,911,469 10,678,856 10,799,228 10,571,706 Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share — 332 — — Additional common stock equivalents (stock options) used to calculate diluted earnings per share 11,391 63,820 9,395 68,519 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,922,860 10,743,008 10,808,623 10,640,225 At June 30, 2018 there were 45,642 shares of nonvested stock outstanding at an average weighted price of $15.37 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive. At June 30, 2017 there were 50,310 shares of nonvested stock outstanding at an average weighted price of $14.38 per share that were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive.

Use of Estimates in the Prepara

Use of Estimates in the Preparation of Financial Statements	9 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Use of Estimates in the Preparation of Financial Statements	3. Use of Estimates in the Preparation of Financial Statements The accounting principles followed by the Company and its subsidiaries and the methods of applying these principles conform to U.S. generally accepted accounting principles (“GAAP”) and to general practice within the banking industry. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the Consolidated Balance Sheet date and related revenues and expenses for the period. Actual results could differ from those estimates.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Jun. 30, 2018
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	4. Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606). 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 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 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20) In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718) In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivative and Hedging (Topic 815). August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 850), In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842), In February 2018, the FASB issued ASU 2018-03, Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10) Derivatives and Hedging—Embedded Derivatives Financial Instruments—Overall Financial Services— Insurance ASU 2018-04, Investments – Debt Securities (Topic 320) and Regulated Operations (Topic 980) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273 ASU 2018-05, Income Taxes (Topic 740) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin (SAB) No. 118 ASU 2018-06, Codification Improvements to Topic 942, Financial Services-Depository and Lending In June 2018, the FASB issued ASU 2018-07, Compensation – Stock Compensation (Topic 718) ASU 2018-09, Codification Improvements ASU 2018-10, Codification Improvements to Topic 842, Leases

Investment Securities

Investment Securities	9 Months Ended
	Jun. 30, 2018
Investments Debt And Equity Securities [Abstract]
Investment Securities	5. The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands): June 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 136,467 $ 19 $ (4,672 ) $ 131,814 Freddie Mac 97,624 13 (3,700 ) 93,937 Governmental National Mortgage Association Securities 19,986 — (685 ) 19,301 Total mortgage-backed securities 254,077 32 (9,057 ) 245,052 Obligations of states and political subdivisions 50,182 541 (1,229 ) 49,494 U.S. government agency securities 12,853 7 (157 ) 12,703 Corporate obligations 44,582 187 (1,150 ) 43,619 Other debt securities 21,014 5 (799 ) 20,220 Total debt securities 382,708 772 (12,392 ) 371,088 Equity securities - financial services 25 — (4 ) 21 Total $ 382,733 $ 772 $ (12,396 ) $ 371,109 September 30, 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 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 The amortized cost and fair value of debt securities at June 30, 2018, 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 $ 728 $ 729 Due after one year through five years 36,878 36,436 Due after five years through ten years 103,013 100,186 Due after ten years 242,089 233,737 Total $ 382,708 $ 371,088 For the three months ended June 30, 2018, the Company realized no gross gains or gross losses on proceeds from the sale of investment securities. For the nine months ended June 30, 2018, the Company realized gross gains of $300,000 and gross losses of $225,000 on proceeds from the sale on investment securities of $22.1 million. For the three and nine months ended June 30, 2017, the Company realized gross gains of $299,000 and gross losses of $4,000 on proceeds from the sale of investment securities of $17.4 million. The following tables show the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (dollars in thousands): June 30, 2018 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 90 $ 73,711 $ (1,854 ) $ 51,557 $ (2,818 ) $ 125,268 $ (4,672 ) Freddie Mac 68 51,483 (1,681 ) 37,623 (2,019 ) 89,106 (3,700 ) Governmental National Mortgage Association 17 12,872 (297 ) 6,429 (388 ) 19,301 (685 ) Obligations of states and political subdivisions 26 11,231 (167 ) 17,983 (1,062 ) 29,214 (1,229 ) U.S. government agency securities 6 12,027 (157 ) — — 12,027 (157 ) Corporate obligations 29 19,368 (425 ) 9,806 (725 ) 29,174 (1,150 ) Other debt securities 19 1,279 (19 ) 17,697 (780 ) 18,976 (799 ) Equity securities 1 21 (4 ) — — 21 (4 ) Total 256 $ 181,992 $ (4,604 ) $ 141,095 $ (7,792 ) $ 323,087 $ (12,396 ) September 30, 2017 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 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 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 ) The Company’s investment securities portfolio contains unrealized losses on securities, including mortgage-related instruments issued or backed by the full faith and credit of the United States government, or generally viewed as having the implied guarantee of the U.S. government, other mortgage backed securities, debt obligations of a U.S. state or political subdivision, U.S. government agency securities, corporate obligations, other debt securities and equity securities. The Company reviews its position quarterly and has asserted that at June 30, 2018, the declines outlined in the above table represent temporary declines and the Company would not be required to sell the above securities before their anticipated recovery in market value. The Company has concluded that any impairment of its investment securities portfolio is not other than temporary but is the result of interest rate changes that are not expected to result in the non-collection of principal and interest during the period.

Loans Receivable, Net and Allow

Loans Receivable, Net and Allowance for Loan Losses	9 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Loans Receivable, Net and Allowance for Loan Losses	6. Loans Receivable, Net and Allowance for Loan Losses Loans receivable consist of the following (in thousands): June 30, 2018 September 30, 2017 Real estate loans: Residential $ 581,620 $ 586,708 Construction 5,042 3,097 Commercial 396,762 318,323 Commercial 49,615 44,129 Obligations of states and political subdivisions 67,468 58,079 Home equity loans and lines of credit 45,043 46,219 Auto Loans 164,437 186,646 Other 2,732 2,845 1,312,719 1,246,046 Less allowance for loan losses 11,130 9,365 Net loans $ 1,301,589 $ 1,236,681 Purchased loans acquired in a business combination are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. Changes in the accretable yield for purchased credit-impaired loans were as follows, since acquisition, for the three and nine months ended June 30, 2018 and 2017 (in thousands): For the Three Months Ended June 30, 2018 2017 Balance at beginning of period $ 574 $ 460 Reclassification, new additions and other — 33 Accretion (282 ) (32 ) Balance at end of period $ 292 $ 461 For the Nine Months Ended June 30, 2018 2017 Balance at beginning of period $ 471 $ 478 Reclassification, new additions and other 681 151 Accretion (860 ) (168 ) Balance at end of period $ 292 $ 461 The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): June 30, 2018 September 30, 2017 Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 3,183 $ 5,490 Carrying amount $ 2,526 $ 4,388 The following tables show the amount of loans in each category that were individually and collectively evaluated for impairment at the dates indicated (in thousands): Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment June 30, 2018 Real estate loans: Residential $ 581,620 $ 5,217 $ — $ 576,403 Construction 5,042 — — 5,042 Commercial 396,762 6,227 2,099 388,436 Commercial 49,615 93 99 49,423 Obligations of states and political subdivisions 67,468 — — 67,468 Home equity loans and lines of credit 45,043 125 328 44,590 Auto loans 164,437 433 — 164,004 Other 2,732 26 — 2,706 Total $ 1,312,719 $ 12,121 $ 2,526 $ 1,298,072 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 sub divisions 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 The Company maintains a loan review system that allows for a periodic review of our loan portfolio and the early identification of potential impaired loans. Such system takes into consideration, among other things, delinquency status, size of loans, type and market value of collateral and financial condition of the borrowers. Specific loan loss allowances are established for identified losses based on a review of such information. A loan evaluated for impairment is considered to be impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. All loans identified as impaired are evaluated independently. The Company does not aggregate such loans for evaluation purposes. Impairment is measured on a loan-by-loan basis for commercial and construction loans by the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral if the loan is collateral-dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Accordingly, the Company does not separately identify individual consumer and residential mortgage loans for impairment disclosures, unless such loans are part of a larger relationship that is impaired, or are classified as a troubled debt restructuring. A loan is considered to be a troubled debt restructuring (“TDR”) loan when the Company grants a concession to the borrower that it would not otherwise consider because of the borrower’s financial condition. Such concessions include the reduction of interest rates, forgiveness of principal or interest, or other modifications of interest rates that are less than the current market rate for new obligations with similar risk. TDR loans that are in compliance with their modified terms and that yield a market rate at the time of modification may be removed from TDR status after one year of performance. The following tables include the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount at the dates indicated, if applicable (in thousands): Recorded Investment Unpaid Principal Balance Associated Allowance June 30, 2018 With no specific allowance recorded: Real estate loans Residential $ 4,089 $ 5,703 $ — Construction — — — Commercial 6,227 7,972 — Commercial 93 353 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 99 114 — Auto loans 221 413 — Other 26 33 — Total 10,755 14,588 — With an allowance recorded: Real estate loans Residential 1,128 1,305 118 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 26 26 3 Auto loans 212 228 98 Other — — — Total 1,366 1,559 219 Total: Real estate loans Residential 5,217 7,008 118 Construction — — — Commercial 6,227 7,972 — Commercial 93 353 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 125 140 3 Auto loans 433 641 98 Other 26 33 — Total Impaired Loans $ 12,121 $ 16,147 $ 219 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2017 With no specific allowance recorded: Real Estate Loans Residential $ 4,392 $ 5,730 $ — Construction — — — Commercial 7,191 9,396 — Commercial 1,385 1,575 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 176 258 — Auto Loans 123 237 — Other 30 36 — Total 13,297 17,232 — With an allowance recorded: Real Estate Loans Residential 1,810 2,264 154 Construction — — — Commercial 20 1,193 19 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 449 468 172 Other — — — Total 2,279 3,925 345 Total: Real Estate Loans Residential 6,202 7,994 154 Construction — — — Commercial 7,211 10,589 19 Commercial 1,385 1,575 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 176 258 — Auto Loans 572 705 172 Other 30 36 — Total Impaired Loans $ 15,576 $ 21,157 $ 345 The following tables represent the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired (in thousands): For the Three Months Ended June 30, 2018 2017 2018 2017 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,968 $ 4,800 $ 6 $ 9 Construction — — — — Commercial 6,564 8,502 70 61 Commercial 445 1,584 8 30 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 133 208 — — Auto loans 205 144 — — Other 27 8 — — Total 11,342 15,246 84 100 With an allowance recorded: Real estate loans Residential 1,212 1,384 — — Construction — — — — Commercial 12 302 — — Commercial — — — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 26 4 — — Auto loans 190 298 — 1 Other — — — — Total 1,440 1,988 — 1 Total: Real estate loans Residential 5,180 6,184 6 9 Construction — — — — Commercial 6,576 8,804 70 61 Commercial 445 1,584 8 30 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 159 212 — — Auto loans 395 442 — 1 Other 27 8 — — Total Impaired Loans $ 12,782 $ 17,234 $ 84 $ 101 For the Nine Months Ended June 30, 2018 2017 2018 2017 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 4,192 $ 5,633 $ 21 $ 30 Construction — — — — Commercial 6,787 9,428 211 233 Commercial 970 1,638 59 92 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 181 243 1 — Auto loans 183 127 1 — Other 28 8 — — Total 12,341 17,077 293 355 With an allowance recorded: Real estate loans Residential 1,332 1,811 — — Construction — — — — Commercial 17 330 — — Commercial — 40 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 13 4 — — Auto loans 228 268 — 7 Other — — — — Total 1,590 2,453 — 7 Total: Real estate loans Residential 5,524 7,444 21 30 Construction — — — — Commercial 6,804 9,758 211 233 Commercial 970 1,678 59 92 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 194 247 1 — Auto loans 411 395 1 7 Other 28 8 — — Total Impaired Loans $ 13,931 $ 19,530 $ 293 $ 362 The Company uses a ten-point internal risk-rating system to monitor the credit quality of the overall loan portfolio. The first six categories are considered not criticized and are aggregated as Pass-rated. The criticized rating categories utilized by management generally follow bank regulatory definitions. The Special Mention category includes assets that are fundamentally sound yet exhibit potentially unacceptable credit risk or deteriorating trends or characteristics which, if left uncorrected, may result in deterioration of the repayment prospects for the asset or in the Company’s credit position at some future date. Loans in the Substandard category have well-defined weaknesses that jeopardize the liquidation of the debt and have a distinct possibility that some loss will be sustained if the weaknesses are not corrected. All loans that are more than 90 days past due are considered Substandard. Loans in the Doubtful category have all the weaknesses inherent in loans classified as Substandard with the added characteristic that their weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loans in the Loss category are considered uncollectible and of little value that their continuance as bankable assets is not warranted. Certain residential real estate loans, construction loans, home equity loans and lines of credit, auto loans and other consumer loans are underwritten and structured using standardized criteria and characteristics, primarily payment performance, and are normally risk rated and monitored collectively on a monthly basis. These are typically loans to individuals in the consumer categories and are delineated as either performing or non-performing. To help ensure that risk ratings are accurate and reflect the present and future capacity of borrowers to repay a loan as agreed, the Bank has a structured loan rating process with several layers of internal and external oversight. Generally, consumer and residential mortgage loans are included in the Pass categories unless a specific action, such as bankruptcy, repossession, or death occurs to raise awareness of a possible credit event. The Bank’s Commercial Loan Officers are responsible for the timely and accurate risk rating recommendation for the loans in their portfolios at origination and on an ongoing basis. The Bank’s Commercial Loan Officers perform an annual review of all commercial relationships $750,000 or greater. Confirmation of the appropriate risk grade is included in the review on an ongoing basis. The Bank engages an external consultant to conduct loan reviews on at least a semi-annual basis. Generally, the external consultant reviews commercial relationships greater than $1,000,000 and/or all criticized relationships. Detailed reviews, including plans for resolution, are performed on loans classified as Substandard on a quarterly basis. Loans in the Special Mention and Substandard categories that are collectively evaluated for impairment are given separate consideration in the determination of the allowance. The following tables present the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful or Loss within the internal risk rating system at June 30, 2018 and September 30, 2017 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2018 Commercial real estate loans $ 373,124 $ 8,601 $ 15,037 $ — $ 396,762 Commercial 47,842 9 1,764 — 49,615 Obligations of states and political subdivisions 67,468 — — — 67,468 Total $ 488,434 $ 8,610 $ 16,801 $ — $ 513,845 Pass Special Mention Substandard Doubtful or Loss 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 All other loans are underwritten and structured using standardized criteria and characteristics, primarily payment performance, and are normally risk rated and monitored collectively on a monthly basis. These are typically loans to individuals in the consumer categories and are delineated as either performing or non-performing. The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2018 and September 30, 2017 (in thousands): Performing Non- performing Purchased Credit Impaired Total June 30, 2018 Real estate loans: Residential $ 576,193 $ 5,427 $ — $ 581,620 Construction 5,042 — — 5,042 Home equity loans and lines of credit 44,423 292 328 45,043 Auto loans 163,910 527 — 164,437 Other 2,705 27 — 2,732 Total $ 792,273 $ 6,273 $ 328 $ 798,874 Performing Non- performing Purchased Impaired Credit 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 The Company further monitors the performance and credit quality of the loan portfolio by analyzing the age of the portfolio as determined by the length of time a recorded payment is past due. The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of June 30, 2018 and September 30, 2017 (in thousands): 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans June 30, 2018 Real estate loans: Residential $ 574,121 $ 1,101 $ 971 $ — $ 5,427 $ 7,499 $ — $ — $ 581,620 Construction 5,042 — — — — — — — 5,042 Commercial 392,210 320 — — 2,133 2,453 258 1,841 396,762 Commercial 49,439 40 — — 37 77 — 99 49,615 Obligations of states and political subdivisions 67,468 — — — — — — — 67,468 Home equity loans and lines of credit 44,394 29 — — 292 321 — 328 45,043 Auto loans 162,931 953 26 — 527 1,506 — — 164,437 Other 2,687 18 — — 27 45 — — 2,732 Total $ 1,298,292 $ 2,461 $ 997 $ — $ 8,443 $ 11,901 $ 258 $ 2,268 $ 1,312,719 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans September 30, 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 The allowance for loan losses is maintained at a level necessary to absorb loan losses that are both probable and reasonably estimable. Management, in determining the allowance for loan losses, considers the losses inherent in its loan portfolio and changes in the nature and volume of loan activities, along with the general economic and real estate market conditions. The allowance for loan losses consists of two elements: (1) an allocated allowance, which comprises allowances established on specific loans and class allowances based on historical loss experience and current trends, and (2) an allocated allowance based on general economic conditions and other risk factors in our markets and portfolios. We maintain a loan review system, which allows for a periodic review of our loan portfolio and the early identification of potential impaired loans. Such system takes into consideration, among other things, delinquency status, size of loans, type and market value of collateral and financial condition of the borrowers. General loan loss allowances are based upon a combination of factors including, but not limited to, actual loan loss experience, composition of the loan portfolio, current economic conditions, management’s judgment and losses which are probable and reasonably estimable. The allowance is increased through provisions charged against current earnings and recoveries of previously charged-off loans. Loans that are determined to be uncollectible are charged against the allowance. While management uses available information to recognize probable and reasonably estimable loan losses, future loss provisions may be necessary, based on changing economic conditions. Payments received on impaired loans generally are either applied against principal or reported as interest income, according to management’s judgment as to the collectability of principal. The allowance for loan losses as of June 30, 2018 was maintained at a level that represents management’s best estimate of losses inherent in the loan portfolio, and such losses were both probable and reasonably estimable. In addition, the FDIC and the Pennsylvania Department of Banking and Securities, as an integral part of their examination process, have periodically reviewed our allowance for loan losses. The banking regulators may require that we recognize additions to the allowance based on its analysis and review of information available to it at the time of its examination. Management reviews the loan portfolio on a quarterly basis using a defined, consistently applied process in order to make appropriate and timely adjustments to the allowance for loan losses (“ALL”). When information confirms all or part of specific loans to be uncollectible, these amounts are promptly charged off against the ALL. The following table summarizes changes in the primary segments of the ALL for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total ALL balance at March 31, 2018 $ 3,755 $ 33 $ 2,821 $ 1,219 $ 269 $ 401 $ 1,904 $ 21 $ 87 $ 10,510 Charge-offs (120 ) — (12 ) — — (41 ) (328 ) — — (501 ) Recoveries 3 — — — — 33 109 1 — 146 Provision (102 ) 10 199 165 23 15 185 1 479 975 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 ALL balance at March 31, 2017 $ 4,130 $ 30 $ 1,038 $ 951 $ 244 $ 445 $ 1,908 $ 24 $ 596 $ 9,366 Charge-offs (23 ) — (649 ) — — - (460 ) — — (1,132 ) Recoveries 11 — 9 1 — 2 213 1 — 237 Provision 88 3 968 34 2 47 205 (2 ) (595 ) 750 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 Charge-offs (215 ) — (27 ) (137 ) — (47 ) (1,415 ) (21 ) — (1,862 ) Recoveries 9 — 2 10 — 38 490 3 — 552 Provision (136 ) 20 1,275 524 44 (53 ) 959 20 422 3,075 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (390 ) — (867 ) (20 ) — (6 ) (1,521 ) (4 ) — (2,808 ) Recoveries 18 — 19 1 — 5 673 7 — 723 Provision 152 20 1,362 123 31 40 834 (5 ) (307 ) 2,250 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 Acquired loans are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. The Company allocated increased provisions to commercial real estate loans due primarily to increased loan balances for the three and nine month periods ended June 30, 2018. The Company allocated increased provisions to commercial loans due primarily to increased loan balances for the three and nine month periods ended June 30, 2018. The Company allocated increased provisions to commercial real estate loans for the three month period ended June 30, 2017 due to charge off activity. The Company allocated increased provisions to auto loans for the three and nine month periods ended June 30, 2018 and 2017 due to increased charge offs, net of recoveries. The following table summarizes the primary segments of the ALL, segregated into two categories, the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2018 and September 30, 2017 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total Individually evaluated for impairment $ 118 $ — $ — $ — $ — $ 3 $ 98 $ — $ — $ 219 Collectively evaluated for impairment 3,418 43 3,008 1,384 292 405 1,772 23 566 10,911 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 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 The allowance for loan losses is based on estimates, and actual losses will vary from current estimates. Management believes that the granularity of the homogeneous pools and the related historical loss ratios and other qualitative factors, as well as the consistency in the application of assumptions, result in an ALL that is representative of the risk found in the components of the portfolio at any given date. Despite the above allocations, the allowance for loan losses is general in nature and is available to absorb losses from any loan segment. The following is a summary of troubled debt restructuring granted during the three and nine months ended June 30, 2018 and 2017 (dollars in thousands): For the Three Months Ended June 30, 2018 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential — — — Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 3 20 20 Other — — — Total 3 $ 20 $ 20 For the Three Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 529 $ 529 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other — — — Total 3 $ 542 $ 542 For the Nine Months Ended June 30, 2018 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 243 $ 235 Construction — — — Commercial 1 107 107 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 4 35 35 Other — — — Total 7 $ 385 $ 377 For the Nine Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 5 $ 902 $ 902 Construction — — — Commercial 1 93 93 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other 1 21 21 Total 8 $ 1,029 $ 1,029 The three new troubled debt restructurings granted for the three months ended June 30, 2018 totaling $20,000 were granted term and rate concessions. Of the three new troubled debt restructurings granted for the three months ended June 30, 2017, two loans totaling $206,000 were granted term and rate concessions, one loan for $336,000 was granted interest rate concessions. For the nine months ended June 30, 2018, six loans totaling $270,000 were granted term and rate concessions and one loan for $107,000 was granted terms concessions. Of the eight new troubled debt restructurings granted for the nine months ended June 30, 2017, one loan totaling $133,000 was granted terms concessions, two loans totaling $357,000 were granted interest rate concessions, and five loans totaling $539,000 were granted terms and rate concessions. For the three months ended June 30, 2018, no loans defaulted on a restructuring defaulted on a restructuring agreement within one year of modification. For the nine months ended June 30, 2018, one loan totaling $72,000 defaulted on a restructuring agreement within one year of modification. For the three and nine months ended June 30, 2017 no loans defaulted on a restructuring agreement within one year of modification. Foreclosed assets acquired in settlement of loans are carried at fair value, less estimated costs to sell, and are included in the Consolidated Balance Sheet. As of June 30, 2018, included within the foreclosed assets is $1.2 million of consumer residential mortgages that were foreclosed on or received via a deed in lieu of foreclosure transaction prior to the period end. As of June 30, 2018, the Company has initiated formal foreclosure proceedings on $3.0 million of consumer residential mortgages which have not yet been transferred into foreclosed assets.

Deposits

Deposits	9 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
Deposits	7. Deposits Deposits consist of the following major classifications (in thousands): June 30, 2018 September 30, 2017 Non-interest bearing demand accounts $ 164,777 $ 160,125 Interest bearing demand accounts 169,521 208,369 Money market accounts 267,990 253,949 Savings and club accounts 141,176 141,521 Certificates of deposit 526,402 510,897 Total $ 1,269,866 $ 1,274,861

Net Periodic Benefit Cost-Defin

Net Periodic Benefit Cost-Defined Benefit Plan	9 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Net Periodic Benefit Cost-Defined Benefit Plan	8 . Net Periodic Benefit Cost-Defined Benefit Plan For a detailed disclosure on the Bank’s pension and employee benefits plans, please refer to Note 12 of the Company’s Consolidated Financial Statements for the year ended September 30, 2017 included in the Company’s Annual Report on Form 10-K. The following table comprises the components of net periodic benefit cost for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2018 2017 2018 2017 Service Cost $ — $ 69 $ — $ 447 Interest Cost 174 208 523 651 Expected return on plan assets (298 ) (348 ) (895 ) (1,037 ) Amortization of unrecognized loss — 23 — 182 Net periodic benefit cost $ (124 ) $ (48 ) $ (372 ) $ 243 The Company’s board of directors adopted resolutions to freeze the status of the Defined Benefit Plan (“the plan”) effective February 28, 2017 (“the freeze date”). Accordingly, no additional participants will enter the plan after February 28, 2017; no additional years of service for benefit accrual purposes will be credited after the freeze date under the plan; and compensation earned by participants after the freeze date will not be taken into account under the plan. As a result of the freeze, the Company’s projected benefit obligation decreased by $7.1 million and there was a tax effected $4.7 million increase to accumulated other comprehensive income in the quarter ended March 31, 2017.

Equity Incentive Plan

Equity Incentive Plan	9 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Incentive Plan	9 . Equity Incentive Plan The Company previously maintained the ESSA Bancorp, Inc. 2007 Equity Incentive Plan (the “Plan”). The Plan provided for a total of 2,377,326 shares of common stock for issuance upon the grant or exercise of awards. Of the shares that were available under the Plan, 1,698,090 were available to be issued in connection with the exercise of stock options and 679,236 were available to be issued as restricted stock. The Plan allowed for the granting of non-qualified stock options (“NSOs”), incentive stock options (“ISOs”), and restricted stock. Options granted under the plan were granted at no less than the fair value of the Company’s common stock on the date of the grant. As of the effective date of the 2016 Equity Incentive Plan (detailed below), no further grants will be made under the Plan and forfeitures of outstanding awards under the Plan will be added to the shares available under the 2016 Equity Incentive Plan. The Company replaced the 2007 Equity Incentive Plan with the ESSA Bancorp, Inc. 2016 Equity Incentive Plan (the “2016 Plan”) which was approved by shareholders on March 3, 2016. The 2016 Plan provides for a total of 250,000 shares of common stock for issuance upon the grant or exercise of awards. The 2016 Plan allows for the granting of restricted stock, restricted stock units, ISOs and NSOs. Certain officers, employees and outside directors were granted in aggregate 1,140,469 NSOs; 317,910 ISOs; and 590,320 shares of restricted stock on May 23, 2008. Certain officers were granted in aggregate 30,000 shares of restricted stock on April 1, 2013, 19,880 shares of restricted stock on July 22, 2014, 21,843 shares of restricted stock on May 20, 2015, 23,491 shares of restricted stock on March 4, 2016, 20,675 shares of restricted stock on December 13, 2016, 3,296 shares of restricted stock on March 29, 2017, 1,250 shares of restricted stock on October 23, 2017 and 24,278 of restricted stock on December 6, 2017. In accordance with generally accepted accounting principles, the Company expenses the fair value of all share-based compensation grants over the requisite service periods. The Company classifies share-based compensation for employees and outside directors within “Compensation and employee benefits” in the Consolidated Statement of Income to correspond with the same line item as compensation paid. Stock options vest over a five-year service period and expire ten years after the grant date. The Company recognized compensation expense for the fair values of these awards, which vested on a straight-line basis over the requisite service period of the awards. The 2013 restricted stock shares vested over an 18 month service period. The 2014 restricted shares vest over a 39 month service period. The 2015 restricted shares vest over a 40 month service period. The March 4, 2016 restricted shares vest over a 43 month service period. The December 13, 2016 restricted shares vest over a 46 month service period. The March 29, 2017 restricted shares vest over 42 months for 1,296 shares and over 18 months for 2,000 shares. The October 23, 2017 restricted shares vested over a 23 month service period. The December 6, 2017 restricted shares vest over a 46 month service period. The product of the number of shares granted and the grant date market price of the Company’s common stock determines the fair value of restricted shares under the Company’s restricted stock plan. For the nine months ended June 30, 2018 and 2017, the Company recorded $276,000 and $231,000 of share-based compensation expense, respectively, comprised of restricted stock expense. Expected future compensation expense relating to the restricted shares issued in 2015, at June 30, 2018 is $20,000 over the remaining vesting period of 0.25 years. Expected future compensation expense relating to the restricted shares issued in March 2016, at June 30, 2018 is $106,000 over the remaining vesting period of 1.25 years. Expected future compensation expense relating to the restricted shares issued in December 2016, at June 30, 2018 is $201,000 over the remaining vesting period of 2.25 years. Expected future compensation expense relating to the restricted shares (1,296) issued in March 2017, at June 30, 2018 is $12,000 over the remaining vesting period of 2.25 years. Expected future compensation expense relating to the restricted shares (2,000) issued in March 2017, at June 30, 2018 is $5,000 over the remaining vesting period of 0.25 years. Expected future compensation expense relating to the restricted shares issued in October 2017, at June 30, 2018 is $12,000 over the remaining vesting period of 1.25 years. Expected future compensation expense relating to the restricted shares issued in December 2017, at June 30, 2018 is $326,000 over the remaining vesting period of 3.25 years. The following is a summary of the Company’s stock option activity and related information for its option grants for the nine month period ended June 30, 2018. Number of Stock Options Weighted- average Exercise Price Weighted- average Remaining Contractual Term (in Aggregate Intrinsic Value (in thousands) Outstanding at September 30, 2017 294,646 $ 12.35 0.67 $ 987 Granted — — — — Exercised 294,646 12.35 — — Forfeited — — — — Outstanding at June 30, 2018 — $ — — $ — Exercisable at June 30, 2018 — $ — — $ — The following is a summary of the status of the Company’s restricted stock as of June 30, 2018, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2017 34,692 $ 14.89 Granted 25,528 15.86 Vested (1,000 ) — Forfeited (2,535 ) 14.79 Nonvested at June 30, 2018 56,685 $ 15.31

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	10. Fair Value Measurement The following disclosures show the hierarchal disclosure framework associated within the level of pricing observations utilized in measuring assets and liabilities at fair value. The definition of fair value maintains the exchange price notion in earlier definitions of fair value but focuses on the exit price of the asset or liability. The exit price is the price that would be received to sell the asset or paid to transfer the liability adjusted for certain inherent risks and restrictions. Expanded disclosures are also required about the use of fair value to measure assets and liabilities. The following tables present information about the Company’s securities, derivatives, other real estate owned, impaired loans and mortgage servicing rights measured at fair value as of June 30, 2018 and September 30, 2017 and indicates the fair value hierarchy of the valuation techniques utilized by the Bank to determine such fair value: Fair Value Measurement at June 30, 2018 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of June 30, 2018 Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage backed securities $ — $ 245,052 $ — $ 245,052 Obligations of states and political subdivisions — 49,494 — 49,494 U.S. government agencies — 12,703 — 12,703 Corporate obligations — 35,850 7,769 43,619 Other debt securities — 20,220 — 20,220 Equity securities-financial services 21 — — 21 Total Securities $ 21 $ 363,319 $ 7,769 $ 371,109 Derivatives and hedging activities: $ — $ 2,408 $ — $ 2,408 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 1,368 $ 1,368 Impaired loans $ — $ — $ 11,902 $ 11,902 Mortgage servicing rights $ — $ — $ 210 $ 210 Fair Value Measurement at September 30, 2017 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of September 30, 2017 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 agencies — 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 $ — $ — $ 1,424 $ 1,424 Impaired loans $ — $ — $ 15,231 $ 15,231 Mortgage Servicing rights $ — $ — $ 232 $ 232 The following tables present a summary of changes in the fair value of the Company’s Level III investments for the three and nine month periods ended June 30, 2018 and 2017 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2018 June 30, 2017 Beginning balance $ 7,767 $ 8,735 Purchases, sales, issuances, settlements, net — — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (loss) 2 (21 ) Transfers in and/or out of Level III — — $ 7,769 $ 8,714 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2018 June 30, 2017 Beginning balance $ 7,224 $ 7,485 Purchases, sales, issuances, settlements, net 500 756 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income 45 473 Transfers in and/or out of Level III — — $ 7,769 $ 8,714 Each financial asset and liability is identified as having been valued according to a specified level of input, 1, 2 or 3. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Fair values determined by Level 2 inputs utilize inputs other than quoted prices included in Level 1 that are observable for the asset, either directly or indirectly. Level 2 inputs include quoted prices for similar assets in active markets, and inputs other than quoted prices that are observable for the asset or liability. Level 3 inputs are unobservable inputs for the asset, and include situations where there is little, if any, market activity for the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy, within which the fair value measurement in its entirety falls, has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset. The measurement of fair value should be consistent with one of the following valuation techniques: market approach, income approach, and/or cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities (including a business). For example, valuation techniques consistent with the market approach often use market multiples derived from a set of comparables. Multiples might lie in ranges with a different multiple for each comparable. The selection of where within the range the appropriate multiple falls requires judgment, considering factors specific to the measurement (qualitative and quantitative). Valuation techniques consistent with the market approach include matrix pricing. Matrix pricing is a mathematical technique used principally to value debt securities without relying exclusively on quoted prices for the specific securities, but rather by relying on a security’s relationship to other benchmark quoted securities. Most of the securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quoted market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Securities reported at fair value utilizing Level 1 inputs are limited to actively traded equity securities whose market price is readily available from the New York Stock Exchange or the NASDAQ exchange. A few securities are valued using Level 3 inputs, all of these are classified as available for sale and are reported at fair value using Level 3 inputs. Mortgage servicing rights are also valued by an independent pricing service. Foreclosed real estate is measured at fair value, less cost to sell at the date of foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value, less cost to sell. Income and expenses from operations and changes in valuation allowance are included in the net expenses from foreclosed real estate. Impaired loans are reported at fair value utilizing level three inputs. For these loans, a review of the collateral is conducted and an appropriate allowance for loan losses is allocated to the loan. At June 30, 2018, 130 impaired loans with a carrying value of $12.1 million were reduced by specific valuation allowance totaling $219,000 resulting in a net fair value of $11.9 million based on Level 3 inputs. At September 30, 2017, 164 impaired loans with a carrying value of $15.6 million were reduced by a specific valuation totaling $345,000 resulting in a net fair value of $15.2 million based on Level 3 inputs. The following tables present additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2018 Impaired loans $ 11,902 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (25.4%) Foreclosed real estate owned 1,368 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 46% (20.0%) Mortgage servicing rights 210 Discounted cash flow Discount rate 11.0% (11.0%) Prepayment speeds 8% to 31% (12.1%) Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range 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% (22.0%) Mortgage servicing rights 232 Discounted cash flow Discount rate 11.0% (11.0%) Prepayment speeds 11% to 30% (15.9%) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal. The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below. Disclosures about Fair Value of Financial Instruments The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below (in thousands). June 30, 2018 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 37,907 $ 37,907 $ — $ — $ 37,907 Certificates of deposit 500 — — 500 500 Investment and mortgage backed securities available for sale 371,109 21 363,319 7,769 371,109 Loans receivable, net 1,301,589 — — 1,271,806 1,271,806 Accrued interest receivable 6,265 6,265 — — 6,265 Regulatory stock 16,597 16,597 — — 16,597 Mortgage servicing rights 210 — — 210 210 Derivatives 2,408 — 2,408 — 2,408 Bank owned life insurance 38,380 38,380 — — 38,380 Financial liabilities: Deposits $ 1,269,866 $ 743,464 $ — $ 522,313 $ 1,265,777 Short-term borrowings 220,006 220,006 — — 220,006 Other borrowings 131,119 — — 129,971 129,971 Advances by borrowers for taxes and insurance 14,802 14,802 — — 14,802 Accrued interest payable 1,302 1,302 — — 1,302 September 30, 2017 Carrying 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 Financial instruments are defined as cash, evidence of an ownership interest in an entity, or a contract which creates an obligation or right to receive or deliver cash or another financial instrument from/to a second entity on potentially favorable or unfavorable terms. Fair value is defined as the amount at which a financial instrument could be exchanged in a current transaction between willing parties other than in a forced or liquidation sale. If a quoted market price is available for a financial instrument, the fair value would be calculated based upon the market price per trading unit of the instrument. If no readily available market exists, the fair value for financial instruments should be based upon management’s judgment regarding current economic conditions, interest rate risk, expected cash flows, future estimated losses, and other factors as determined through various option pricing formulas or simulation modeling. As many of these assumptions result from judgments made by management based upon estimates which are inherently uncertain, the resulting values may not be indicative of the amount realizable in the sale of a particular financial instrument. In addition, changes in the assumptions on which the values are based may have a significant impact on the resulting estimated values. As certain assets and liabilities, such as deferred tax assets, premises and equipment, and many other operational elements of the Bank, are not considered financial instruments but have value, this fair value of financial instruments would not represent the full market value of the Company. The Company employed simulation modeling in determining the fair value of financial instruments for which quoted market prices were not available based upon the following assumptions: Cash and Cash Equivalents, Accrued Interest Receivable, Short-Term Borrowings, Advances by Borrowers for Taxes and Insurance, and Accrued Interest Payable The fair value approximates the current book value. Bank-Owned Life Insurance The fair value is equal to the cash surrender value of the Bank-owned life insurance. Investment and Mortgage-Backed Securities Available for Sale and Regulatory Stock The fair value of investment and mortgage-backed securities available for sale is equal to the available quoted market price. If no quoted market price is available, fair value is estimated using the quoted market price for similar securities. Since the Regulatory stock is not actively traded on a secondary market and held exclusively by member financial institutions, the fair market value approximates the carrying amount. For certain securities which are not traded in active markets or are subject to transfer restrictions, valuations are adjusted to reflect illiquidity and/or non-transferability, and such adjustments are generally based on available market evidence (Level 3). In the absence of such evidence, management’s best estimate is used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Internal cash flow models using a present value formula that includes assumptions market participants would use along with indicative exit pricing obtained from broker/dealers (where available) are used to support fair values of certain Level 3 investments, if applicable. Loans Receivable, Net The fair values of loans are estimated using discounted cash flow analyses, using market rates at the balance sheet date that reflect the credit and interest rate-risk inherent in the loans. Projected future cash flows are calculated based upon contractual maturity or call dates, projected repayments and prepayments of principal. Generally, for variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. Mortgage Servicing Rights The Company utilizes a third party provider to estimate the fair value of certain loan servicing rights. Fair value for the purpose of this measurement is defined as the amount at which the asset could be exchanged in a current transaction between willing parties, other than in a forced liquidation. Derivatives Fair values of interest rate cap and interest rate swap contracts are based on dealer quotes. Deposits (including Certificates of Deposit) The fair values disclosed for demand, savings, and money market deposit accounts are valued at the amount payable on demand as of quarter-end. Fair values for time deposits are estimated using a discounted cash flow calculation that applies contractual costs currently being offered in the existing portfolio to current market rates being offered for deposits of similar remaining maturities. Other Borrowings Fair values for other borrowings are estimated using a discounted cash flow calculation that applies contractual costs currently being offered in the existing portfolio to current market rates being offered for other borrowings of similar remaining maturities. Commitments to Extend Credit These financial instruments are generally not subject to sale, and fair values are not readily available. The carrying value, represented by the net deferred fee arising from the unrecognized commitment, and the fair value, determined by discounting the remaining contractual fee over the term of the commitment using fees currently charged to enter into similar agreements with similar credit risk, are not considered material for disclosure.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Loss	11. Accumulated Other Comprehensive Loss The activity in accumulated other comprehensive loss for the three and nine months period ended June 30, 2018 and 2017 is as follows (in thousands): Accumulated Other Comprehensive Loss Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2018 $ (752 ) $ (7,808 ) $ 1,825 $ (6,735 ) Other comprehensive income (loss) before reclassifications — (1,376 ) 188 (1,188 ) Amounts reclassified from accumulated other comprehensive loss — — (112 ) (112 ) Reclassification of certain income tax effects from accumulated other comprehensive income (loss) — — — — Period change — (1,376 ) 76 (1,300 ) Balance at June 30, 2018 $ (752 ) $ (9,184 ) $ 1,901 $ (8,035 ) Balance at March 31, 2017 $ (1,266 ) $ (2,020 ) $ 922 $ (2,364 ) Other comprehensive income (loss) before reclassifications — 940 (149 ) 791 Amounts reclassified from accumulated other comprehensive loss, net of tax 12 (195 ) (2 ) (185 ) Period change 12 745 (151 ) 606 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2017 $ (628 ) $ (927 ) $ 801 $ (754 ) Other comprehensive income (loss) before reclassifications — (7,764 ) 1,076 (6,688 ) Amounts reclassified from accumulated other comprehensive loss, net of tax — (57 ) (190 ) (247 ) Reclassification of certain income tax effects from accumulated other comprehensive income (124 ) (436 ) 214 (346 ) Period change (124 ) (8,257 ) 1,100 (7,281 ) Balance at June 30, 2018 $ (752 ) $ (9,184 ) $ 1,901 $ (8,035 ) Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Other comprehensive income before reclassifications 4,714 (5,032 ) 470 152 Amounts reclassified from accumulated other comprehensive loss, net of tax 115 (195 ) 2 (78 ) Period change 4,829 (5,227 ) 472 74 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) The following table presents significant amounts reclassified out of each component of accumulated other comprehensive loss for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2018 2017 Securities available for sale Net securities gains reclassified into earnings $ — $ 295 Gains on sale of investments, net Related income tax expense — (100 ) Income taxes Net effect on accumulated other comprehensive loss for the period — 195 Net of tax Defined benefit pension plan: Amortization of net (loss) gain and prior service costs — (23 ) Compensation and employee Related income tax expense — 11 Income taxes Net effect on accumulated other comprehensive loss for the period — (12 ) Net of tax Derivatives and hedging activities: Interest expense, effective portion 153 3 Interest expense Related income tax expense (41 ) (1 ) Income taxes Net effect on accumulated other comprehensive loss for the period 112 2 Net of tax Total reclassification for the period $ 112 $ 185 Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2018 2017 Securities available for sale: Net securities gains reclassified into earnings $ 75 $ 295 Gain on sale of investments, net Related income tax expense (18 ) (100 ) Income taxes Net effect on accumulated other comprehensive loss for the period 57 195 Net of tax Defined benefit pension plan: Amoritization of net (loss) gain and prior services costs — (182 ) Compensation and employee benefits Related income tax expense — 67 Income taxes Net effect on accumulated other comprehensive loss for the period — (115 ) Net of tax Derivative and Hedging Activities: Interest expense, effective portion 252 (3 ) Interest expense Related income tax expense (62 ) 1 Income taxes Net effect on accumulated other comprehensive loss for the period 190 (2 ) Net of tax Total reclassification for the period $ 247 $ 78

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	12. Derivatives and Hedging Activities Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities and through the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to certain variable rate borrowings. Fair Values of Derivative Instruments on the Consolidated Balance Sheet The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheet as of June 30, 2018 and September 30, 2017 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2018 As of September 30, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest Rate Products Other Assets $ 2,408 Other Assets $ 1,215 Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest income and expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company has entered into interest rate swaps as part of its interest rate risk management strategy. These interest rate swaps are designated as cash flow hedges and involve the receipt of variable rate amounts from a counterparty in exchange for the Company making fixed payments. As of June 30, 2018, the Company had four interest rate swaps with a notional principal amount of $100.0 million associated with the Company’s cash outflows associated with various FHLB advances. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in other comprehensive income (outside of earnings), net of tax, and subsequently reclassified to earnings when the hedged transaction affects earnings, and the ineffective portion of changes in the fair value of the derivative is recognized directly in earnings. The Company assesses the effectiveness of each hedging relationship by comparing the changes in cash flows of the derivative hedging instrument with the changes in cash flows of the designated hedged transactions. The Company did not recognize any hedge ineffectiveness in earnings during the period ended June 30, 2018. Amounts reported in accumulated other comprehensive loss related to derivatives that will be reclassified to interest income/expense as interest payments are made/received on the Company’s variable-rate assets/liabilities. During the three months ended June 30, 2018, the Company had $133,000 of gains reclassified to interest expense. During the nine months ended June 30, 2018, the Company had $232,000 of gains reclassified to interest expense. During the next twelve months, the Company estimates that $0 will be reclassified as a decrease in interest expense. The tables below present the pre-tax net gains (losses) of the Company’s cash flow hedges for the three and nine month periods ended June 30, 2018 and 2017, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended June 30, 2018 2017 2018 2017 2018 2017 Interest Rate Products $ 249 $ (231 ) Interest expense $ 153 $ 3 Other non-interest income $ — $ — Ending balance of OCI Total $ 249 $ (231 ) $ 153 $ 3 $ — $ — Derivatives in Cash Flow Hedging Relationships Gain Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss)Reclassified from Accumulated OCI into Income (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Nine Months Ended June 30, 2018 2017 2018 2017 2018 2017 Interest Rate Products $ 1,445 $ 873 Interest expense $ 252 $ (3 ) Other non-interest income $ — $ — Ending balance of OCI Total $ 1,445 $ 873 $ 252 $ (3 ) $ — $ — Credit-risk-related Contingent Features The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well / adequately capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. As of June 30, 2018 the Company had no derivatives in a net liability position and was not required to post collateral against its obligations under these agreements. If the Company had breached any of these provisions at June 30, 2018, it could have been required to settle its obligations under the agreements at the termination value.

Contingent Liabilities

Contingent Liabilities	9 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Contingent Liabilities	13. Contingent Liabilities Legal Proceedings The Company and its subsidiaries are subject to various legal actions arising in the normal course of business. In the opinion of Management, the resolution of these legal actions is not expected to have a material adverse effect on the Company’s results of operations. The Bank was named as the defendant in an action commenced on September 13, 2016 by one plaintiff. 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 an agreement to resolve the claims asserted against the Bank on a class wide basis. The terms of the settlement 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 court has approved the settlement. 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. In an order dated January 29, 2018, the court granted the Bank’s motion to dismiss the case. The plaintiff has appealed the court’s ruling. The plaintiff submitted her brief in support of her appeal in May 2018, and the Bank submitted its opposition brief in July 2018. The appellate court has tentatively scheduled oral arguments for October or November 2018. To the extent that this litigation could result in exposure to the bank, the amount is not currently estimable.

Income Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes The reconciliation of the federal statutory rate and the Company’s effective income tax rate is as follows (in thousands): For the Three Months Ended June 30, 2018 2017 Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 806 24.2 % $ 751 34.0 % Income from bank-owned life insurance (61 ) (2.2 %) (88 ) (4.8 %) Tax-exempt income (112 ) (4.0 %) (210 ) (11.4 %) Low-income housing credits (53 ) (1.9 %) (25 ) (1.4 %) Tax rate change (98 ) (3.5 %) 0.0 % Other, net 18 0.6 % 20 1.0 % Actual tax expense and effective rate $ 500 13.3 % $ 448 17.5 % For the Nine Months Ended June 30, 2018 2017 Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 2,077 24.2 % $ 2,168 34.0 % Income from bank-owned life insurance (183 ) (3.5 %) (264 ) (6.3 %) Tax-exempt income (381 ) (7.3 %) (642 ) (15.4 %) Low-income housing credits (96 ) (1.8 %) (148 ) (3.6 %) Tax rate change 3,682 70.2 % — 0.0 % Other, net 23 0.4 % (63 ) (1.5 %) Actual tax expense and effective rate $ 5,122 82.3 % $ 1,051 7.2 % On December 22, 2017, the U.S. Government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). The Tax Act amends the Internal Revenue Code to reduce tax rates and modify policies, credits, and deductions for individuals and businesses. For businesses, the Tax Act reduces the corporate federal tax rate from a maximum of 35% to a flat 21% rate. The corporate tax rate reduction was effective January 1, 2018. Because the Company has a fiscal year end of September 30, the reduced corporate tax rate will result in the application of a blended federal statutory tax rate for its fiscal year 2018 and then a flat 21% thereafter. As a result, the carrying value of net deferred tax assets was reduced in December 2017, which increased income tax expense by $3.7 million. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. These calculations are based on many complex factors including estimates of the timing of reversals of temporary differences, the interpretation of federal income tax laws, and a determination of the differences between the tax and the financial reporting basis of assets and liabilities. Actual results could differ significantly from the estimates and interpretations used in determining the current and deferred income tax assets and liabilities. Under GAAP, a valuation allowance is required to be recognized if it is “more likely than not” that a portion of the deferred tax asset will not be realized. Our policy is to evaluate our deferred tax assets on a quarterly basis and record a valuation allowance for our deferred tax asset if we do not have sufficient positive evidence indicating that it is more likely than not that some or all of the deferred tax asset will be realized. Each quarter, we consider positive evidence, which may include taxes paid in carryback years, reversing timing differences, available tax planning strategies, and projected taxable income and weigh it against negative evidence, which may include cumulative losses in the most recent three year period and uncertainty regarding short-term future earnings, among other items. At June 30, 2018, management determined that no valuation allowance on the deferred tax asset was required. This determination was based on sufficient positive evidence associated with our profitability, demonstrated through consecutive earnings over the recent three year period, and our projections for future taxable income.

Recent Accounting Pronounceme23

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Jun. 30, 2018
Accounting Changes And Error Corrections [Abstract]
Revenue from Contracts with Customers	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606). In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606), Revenue from Contracts with Customers (Topic 606) Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date
Financial Instruments	In January 2016, the FASB issued ASU 2016-01 , Financial Instruments – Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments
Lease	In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842),
Statement of Cash Flows	In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments
Business Combinations	In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business,
Goodwill Impairment	In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment
Other Income	In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20)
Compensation	In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715) In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation (Topic 718) In June 2018, the FASB issued ASU 2018-07, Compensation – Stock Compensation (Topic 718)
Receivables	In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20)
Earnings Per Share	In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), and Derivative and Hedging (Topic 815).
Derivatives and Hedging	August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 850),
Technical Corrections and Improvements to Financial Instruments	In February 2018, the FASB issued ASU 2018-03, Technical Corrections and Improvements to Financial Instruments—Overall (Subtopic 825-10) Derivatives and Hedging—Embedded Derivatives Financial Instruments—Overall Financial Services— Insurance

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Composition of the Weighted-Average Common Shares (Denominator) Used in the Basic and Diluted Earnings Per Share Computation	The following table sets forth the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computation for the three and nine month periods ended June 30, 2018 and 2017. Three Months Ended Nine Months Ended June 30, June 30, June 30, June 30, 2018 2017 2018 2017 Weighted-average common shares outstanding 18,133,095 18,133,095 18,133,095 18,133,095 Average treasury stock shares (6,360,627 ) (6,547,695 ) (6,447,516 ) (6,629,264 ) Average unearned ESOP shares (831,689 ) (876,964 ) (843,049 ) (888,324 ) Average unearned non-vested shares (29,310 ) (29,580 ) (43,302 ) (43,801 ) Weighted average common shares and common stock equivalents used to calculate basic earnings per share 10,911,469 10,678,856 10,799,228 10,571,706 Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share — 332 — — Additional common stock equivalents (stock options) used to calculate diluted earnings per share 11,391 63,820 9,395 68,519 Weighted average common shares and common stock equivalents used to calculate diluted earnings per share 10,922,860 10,743,008 10,808,623 10,640,225

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Jun. 30, 2018
Investments Debt And Equity Securities [Abstract]
Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale	The amortized cost, gross unrealized gains and losses, and fair value of investment securities available for sale are summarized as follows (in thousands): June 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Fannie Mae $ 136,467 $ 19 $ (4,672 ) $ 131,814 Freddie Mac 97,624 13 (3,700 ) 93,937 Governmental National Mortgage Association Securities 19,986 — (685 ) 19,301 Total mortgage-backed securities 254,077 32 (9,057 ) 245,052 Obligations of states and political subdivisions 50,182 541 (1,229 ) 49,494 U.S. government agency securities 12,853 7 (157 ) 12,703 Corporate obligations 44,582 187 (1,150 ) 43,619 Other debt securities 21,014 5 (799 ) 20,220 Total debt securities 382,708 772 (12,392 ) 371,088 Equity securities - financial services 25 — (4 ) 21 Total $ 382,733 $ 772 $ (12,396 ) $ 371,109 September 30, 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 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
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities at June 30, 2018, 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 $ 728 $ 729 Due after one year through five years 36,878 36,436 Due after five years through ten years 103,013 100,186 Due after ten years 242,089 233,737 Total $ 382,708 $ 371,088
Schedule of Gross Unrealized Losses and Fair Value	The following tables show the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (dollars in thousands): June 30, 2018 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 90 $ 73,711 $ (1,854 ) $ 51,557 $ (2,818 ) $ 125,268 $ (4,672 ) Freddie Mac 68 51,483 (1,681 ) 37,623 (2,019 ) 89,106 (3,700 ) Governmental National Mortgage Association 17 12,872 (297 ) 6,429 (388 ) 19,301 (685 ) Obligations of states and political subdivisions 26 11,231 (167 ) 17,983 (1,062 ) 29,214 (1,229 ) U.S. government agency securities 6 12,027 (157 ) — — 12,027 (157 ) Corporate obligations 29 19,368 (425 ) 9,806 (725 ) 29,174 (1,150 ) Other debt securities 19 1,279 (19 ) 17,697 (780 ) 18,976 (799 ) Equity securities 1 21 (4 ) — — 21 (4 ) Total 256 $ 181,992 $ (4,604 ) $ 141,095 $ (7,792 ) $ 323,087 $ (12,396 ) September 30, 2017 Number of Securities Less than Twelve Months Twelve Months or Greater Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fannie Mae 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 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 )

Loans Receivable, Net and All26

Loans Receivable, Net and Allowance for Loan Losses (Tables)	9 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable consist of the following (in thousands): June 30, 2018 September 30, 2017 Real estate loans: Residential $ 581,620 $ 586,708 Construction 5,042 3,097 Commercial 396,762 318,323 Commercial 49,615 44,129 Obligations of states and political subdivisions 67,468 58,079 Home equity loans and lines of credit 45,043 46,219 Auto Loans 164,437 186,646 Other 2,732 2,845 1,312,719 1,246,046 Less allowance for loan losses 11,130 9,365 Net loans $ 1,301,589 $ 1,236,681
Changes in Accretable Yield for Purchased Credit-Impaired Loans	Changes in the accretable yield for purchased credit-impaired loans were as follows, since acquisition, for the three and nine months ended June 30, 2018 and 2017 (in thousands): For the Three Months Ended June 30, 2018 2017 Balance at beginning of period $ 574 $ 460 Reclassification, new additions and other — 33 Accretion (282 ) (32 ) Balance at end of period $ 292 $ 461 For the Nine Months Ended June 30, 2018 2017 Balance at beginning of period $ 471 $ 478 Reclassification, new additions and other 681 151 Accretion (860 ) (168 ) Balance at end of period $ 292 $ 461
Summary of Additional Information Regarding Loans Acquired and Accounted	The following table presents additional information regarding loans acquired and accounted for in accordance with ASC 310-30 (in thousands): June 30, 2018 September 30, 2017 Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Acquired Loans with Specific Evidence or Deterioration in Credit Quality (ASC 310-30) Outstanding balance $ 3,183 $ 5,490 Carrying amount $ 2,526 $ 4,388
Schedule of Loans Evaluated for Impairment	The following tables show the amount of loans in each category that were individually and collectively evaluated for impairment at the dates indicated (in thousands): Total Loans Individually Evaluated for Impairment Loans Acquired with Deteriorated Credit Quality Collectively Evaluated for Impairment June 30, 2018 Real estate loans: Residential $ 581,620 $ 5,217 $ — $ 576,403 Construction 5,042 — — 5,042 Commercial 396,762 6,227 2,099 388,436 Commercial 49,615 93 99 49,423 Obligations of states and political subdivisions 67,468 — — 67,468 Home equity loans and lines of credit 45,043 125 328 44,590 Auto loans 164,437 433 — 164,004 Other 2,732 26 — 2,706 Total $ 1,312,719 $ 12,121 $ 2,526 $ 1,298,072 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 sub divisions 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
Schedule of Investment and Unpaid Principal Balances for Impaired Loans	The following tables include the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount at the dates indicated, if applicable (in thousands): Recorded Investment Unpaid Principal Balance Associated Allowance June 30, 2018 With no specific allowance recorded: Real estate loans Residential $ 4,089 $ 5,703 $ — Construction — — — Commercial 6,227 7,972 — Commercial 93 353 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 99 114 — Auto loans 221 413 — Other 26 33 — Total 10,755 14,588 — With an allowance recorded: Real estate loans Residential 1,128 1,305 118 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 26 26 3 Auto loans 212 228 98 Other — — — Total 1,366 1,559 219 Total: Real estate loans Residential 5,217 7,008 118 Construction — — — Commercial 6,227 7,972 — Commercial 93 353 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 125 140 3 Auto loans 433 641 98 Other 26 33 — Total Impaired Loans $ 12,121 $ 16,147 $ 219 Recorded Investment Unpaid Principal Balance Associated Allowance September 30, 2017 With no specific allowance recorded: Real Estate Loans Residential $ 4,392 $ 5,730 $ — Construction — — — Commercial 7,191 9,396 — Commercial 1,385 1,575 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 176 258 — Auto Loans 123 237 — Other 30 36 — Total 13,297 17,232 — With an allowance recorded: Real Estate Loans Residential 1,810 2,264 154 Construction — — — Commercial 20 1,193 19 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto Loans 449 468 172 Other — — — Total 2,279 3,925 345 Total: Real Estate Loans Residential 6,202 7,994 154 Construction — — — Commercial 7,211 10,589 19 Commercial 1,385 1,575 — Obligations of states and political subdivisions — — — Home equity loans and lines of credit 176 258 — Auto Loans 572 705 172 Other 30 36 — Total Impaired Loans $ 15,576 $ 21,157 $ 345 The following tables represent the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired (in thousands): For the Three Months Ended June 30, 2018 2017 2018 2017 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 3,968 $ 4,800 $ 6 $ 9 Construction — — — — Commercial 6,564 8,502 70 61 Commercial 445 1,584 8 30 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 133 208 — — Auto loans 205 144 — — Other 27 8 — — Total 11,342 15,246 84 100 With an allowance recorded: Real estate loans Residential 1,212 1,384 — — Construction — — — — Commercial 12 302 — — Commercial — — — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 26 4 — — Auto loans 190 298 — 1 Other — — — — Total 1,440 1,988 — 1 Total: Real estate loans Residential 5,180 6,184 6 9 Construction — — — — Commercial 6,576 8,804 70 61 Commercial 445 1,584 8 30 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 159 212 — — Auto loans 395 442 — 1 Other 27 8 — — Total Impaired Loans $ 12,782 $ 17,234 $ 84 $ 101 For the Nine Months Ended June 30, 2018 2017 2018 2017 Average Recorded Investment Average Recorded Investment Interest Income Recognized Interest Income Recognized With no specific allowance recorded: Real estate loans Residential $ 4,192 $ 5,633 $ 21 $ 30 Construction — — — — Commercial 6,787 9,428 211 233 Commercial 970 1,638 59 92 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 181 243 1 — Auto loans 183 127 1 — Other 28 8 — — Total 12,341 17,077 293 355 With an allowance recorded: Real estate loans Residential 1,332 1,811 — — Construction — — — — Commercial 17 330 — — Commercial — 40 — — Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 13 4 — — Auto loans 228 268 — 7 Other — — — — Total 1,590 2,453 — 7 Total: Real estate loans Residential 5,524 7,444 21 30 Construction — — — — Commercial 6,804 9,758 211 233 Commercial 970 1,678 59 92 Obligations of states and political subdivisions — — — — Home equity loans and lines of credit 194 247 1 — Auto loans 411 395 1 7 Other 28 8 — — Total Impaired Loans $ 13,931 $ 19,530 $ 293 $ 362
Classes of the Loan Portfolio, Internal Risk Rating System	The following tables present the classes of the loan portfolio summarized by the aggregate Pass and the criticized categories of Special Mention, Substandard, and Doubtful or Loss within the internal risk rating system at June 30, 2018 and September 30, 2017 (in thousands): Pass Special Mention Substandard Doubtful or Loss Total June 30, 2018 Commercial real estate loans $ 373,124 $ 8,601 $ 15,037 $ — $ 396,762 Commercial 47,842 9 1,764 — 49,615 Obligations of states and political subdivisions 67,468 — — — 67,468 Total $ 488,434 $ 8,610 $ 16,801 $ — $ 513,845 Pass Special Mention Substandard Doubtful or Loss 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
Schedule of Performing or non-performing Loans	The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2018 and September 30, 2017 (in thousands): Performing Non- performing Purchased Credit Impaired Total June 30, 2018 Real estate loans: Residential $ 576,193 $ 5,427 $ — $ 581,620 Construction 5,042 — — 5,042 Home equity loans and lines of credit 44,423 292 328 45,043 Auto loans 163,910 527 — 164,437 Other 2,705 27 — 2,732 Total $ 792,273 $ 6,273 $ 328 $ 798,874 Performing Non- performing Purchased Impaired Credit 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
Classes of the Loan Portfolio Summarized by the Aging Categories	The following tables present the classes of the loan portfolio summarized by the aging categories of performing loans and nonaccrual loans as of June 30, 2018 and September 30, 2017 (in thousands): 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans June 30, 2018 Real estate loans: Residential $ 574,121 $ 1,101 $ 971 $ — $ 5,427 $ 7,499 $ — $ — $ 581,620 Construction 5,042 — — — — — — — 5,042 Commercial 392,210 320 — — 2,133 2,453 258 1,841 396,762 Commercial 49,439 40 — — 37 77 — 99 49,615 Obligations of states and political subdivisions 67,468 — — — — — — — 67,468 Home equity loans and lines of credit 44,394 29 — — 292 321 — 328 45,043 Auto loans 162,931 953 26 — 527 1,506 — — 164,437 Other 2,687 18 — — 27 45 — — 2,732 Total $ 1,298,292 $ 2,461 $ 997 $ — $ 8,443 $ 11,901 $ 258 $ 2,268 $ 1,312,719 31-60 Days 61-89 Days 90 + Days Past Due and Total Purchased Credit Impaired Total Current Past Due Past Due Accruing Non­accrual Past Due Accruing Non­accrual Loans September 30, 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
Summary of Primary Segments of ALL	The following table summarizes changes in the primary segments of the ALL for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total ALL balance at March 31, 2018 $ 3,755 $ 33 $ 2,821 $ 1,219 $ 269 $ 401 $ 1,904 $ 21 $ 87 $ 10,510 Charge-offs (120 ) — (12 ) — — (41 ) (328 ) — — (501 ) Recoveries 3 — — — — 33 109 1 — 146 Provision (102 ) 10 199 165 23 15 185 1 479 975 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 ALL balance at March 31, 2017 $ 4,130 $ 30 $ 1,038 $ 951 $ 244 $ 445 $ 1,908 $ 24 $ 596 $ 9,366 Charge-offs (23 ) — (649 ) — — - (460 ) — — (1,132 ) Recoveries 11 — 9 1 — 2 213 1 — 237 Provision 88 3 968 34 2 47 205 (2 ) (595 ) 750 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 ALL balance at September 30, 2017 $ 3,878 $ 23 $ 1,758 $ 987 $ 248 $ 470 $ 1,836 $ 21 $ 144 $ 9,365 Charge-offs (215 ) — (27 ) (137 ) — (47 ) (1,415 ) (21 ) — (1,862 ) Recoveries 9 — 2 10 — 38 490 3 — 552 Provision (136 ) 20 1,275 524 44 (53 ) 959 20 422 3,075 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 ALL balance at September 30, 2016 $ 4,426 $ 13 $ 852 $ 882 $ 215 $ 455 $ 1,880 $ 25 $ 308 $ 9,056 Charge-offs (390 ) — (867 ) (20 ) — (6 ) (1,521 ) (4 ) — (2,808 ) Recoveries 18 — 19 1 — 5 673 7 — 723 Provision 152 20 1,362 123 31 40 834 (5 ) (307 ) 2,250 ALL balance at June 30, 2017 $ 4,206 $ 33 $ 1,366 $ 986 $ 246 $ 494 $ 1,866 $ 23 $ 1 $ 9,221 Acquired loans are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses. The Company allocated increased provisions to commercial real estate loans due primarily to increased loan balances for the three and nine month periods ended June 30, 2018. The Company allocated increased provisions to commercial loans due primarily to increased loan balances for the three and nine month periods ended June 30, 2018. The Company allocated increased provisions to commercial real estate loans for the three month period ended June 30, 2017 due to charge off activity. The Company allocated increased provisions to auto loans for the three and nine month periods ended June 30, 2018 and 2017 due to increased charge offs, net of recoveries. The following table summarizes the primary segments of the ALL, segregated into two categories, the amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2018 and September 30, 2017 (in thousands): Home Obligations of Equity States and Loans and Real Estate Loans Commercial Political Lines of Other Residential Construction Commercial Loans Subdivisions Credit Auto Loans Loans Unallocated Total Individually evaluated for impairment $ 118 $ — $ — $ — $ — $ 3 $ 98 $ — $ — $ 219 Collectively evaluated for impairment 3,418 43 3,008 1,384 292 405 1,772 23 566 10,911 ALL balance at June 30, 2018 $ 3,536 $ 43 $ 3,008 $ 1,384 $ 292 $ 408 $ 1,870 $ 23 $ 566 $ 11,130 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
Summary of Troubled Debt Restructuring Granted	The following is a summary of troubled debt restructuring granted during the three and nine months ended June 30, 2018 and 2017 (dollars in thousands): For the Three Months Ended June 30, 2018 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential — — — Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 3 20 20 Other — — — Total 3 $ 20 $ 20 For the Three Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 529 $ 529 Construction — — — Commercial — — — Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other — — — Total 3 $ 542 $ 542 For the Nine Months Ended June 30, 2018 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 2 $ 243 $ 235 Construction — — — Commercial 1 107 107 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 4 35 35 Other — — — Total 7 $ 385 $ 377 For the Nine Months Ended June 30, 2017 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Troubled Debt Restructurings Real estate loans: Residential 5 $ 902 $ 902 Construction — — — Commercial 1 93 93 Commercial — — — Obligations of states and political subdivisions — — — Home equity loans and lines of credit — — — Auto loans 1 13 13 Other 1 21 21 Total 8 $ 1,029 $ 1,029

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Jun. 30, 2018
Banking And Thrift [Abstract]
Schedule of Deposits by Major Classifications	Deposits consist of the following major classifications (in thousands): June 30, 2018 September 30, 2017 Non-interest bearing demand accounts $ 164,777 $ 160,125 Interest bearing demand accounts 169,521 208,369 Money market accounts 267,990 253,949 Savings and club accounts 141,176 141,521 Certificates of deposit 526,402 510,897 Total $ 1,269,866 $ 1,274,861

Net Periodic Benefit Cost-Def28

Net Periodic Benefit Cost-Defined Benefit Plan (Tables)	9 Months Ended
	Jun. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Summary of the Components of Net Periodic Benefit Cost	The following table comprises the components of net periodic benefit cost for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): For the Three Months Ended June 30, For the Nine Months Ended June 30, 2018 2017 2018 2017 Service Cost $ — $ 69 $ — $ 447 Interest Cost 174 208 523 651 Expected return on plan assets (298 ) (348 ) (895 ) (1,037 ) Amortization of unrecognized loss — 23 — 182 Net periodic benefit cost $ (124 ) $ (48 ) $ (372 ) $ 243

Equity Incentive Plan (Tables)

Equity Incentive Plan (Tables)	9 Months Ended
	Jun. 30, 2018
Postemployment Benefits [Abstract]
Schedule of Stock Option Activity	The following is a summary of the Company’s stock option activity and related information for its option grants for the nine month period ended June 30, 2018. Number of Stock Options Weighted- average Exercise Price Weighted- average Remaining Contractual Term (in Aggregate Intrinsic Value (in thousands) Outstanding at September 30, 2017 294,646 $ 12.35 0.67 $ 987 Granted — — — — Exercised 294,646 12.35 — — Forfeited — — — — Outstanding at June 30, 2018 — $ — — $ — Exercisable at June 30, 2018 — $ — — $ —
Schedule of Restricted Stock Option Activity	The following is a summary of the status of the Company’s restricted stock as of June 30, 2018, and changes therein during the nine month period then ended: Number of Restricted Weighted- average Grant Date Fair Value Nonvested at September 30, 2017 34,692 $ 14.89 Granted 25,528 15.86 Vested (1,000 ) — Forfeited (2,535 ) 14.79 Nonvested at June 30, 2018 56,685 $ 15.31

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Securities, Derivatives, Other Real Estate Owned and Impaired Loans Measured at Fair Value	The following tables present information about the Company’s securities, derivatives, other real estate owned, impaired loans and mortgage servicing rights measured at fair value as of June 30, 2018 and September 30, 2017 and indicates the fair value hierarchy of the valuation techniques utilized by the Bank to determine such fair value: Fair Value Measurement at June 30, 2018 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of June 30, 2018 Assets measured at fair value on a recurring basis: Investment securities available for sale: Mortgage backed securities $ — $ 245,052 $ — $ 245,052 Obligations of states and political subdivisions — 49,494 — 49,494 U.S. government agencies — 12,703 — 12,703 Corporate obligations — 35,850 7,769 43,619 Other debt securities — 20,220 — 20,220 Equity securities-financial services 21 — — 21 Total Securities $ 21 $ 363,319 $ 7,769 $ 371,109 Derivatives and hedging activities: $ — $ 2,408 $ — $ 2,408 Assets measured at fair value on a nonrecurring basis: Foreclosed real estate $ — $ — $ 1,368 $ 1,368 Impaired loans $ — $ — $ 11,902 $ 11,902 Mortgage servicing rights $ — $ — $ 210 $ 210 Fair Value Measurement at September 30, 2017 Fair Value Measurements Utilized for the Company’s Financial Assets (in thousands): Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of September 30, 2017 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 agencies — 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 $ — $ — $ 1,424 $ 1,424 Impaired loans $ — $ — $ 15,231 $ 15,231 Mortgage Servicing rights $ — $ — $ 232 $ 232
Schedule of Changes in Fair Value of Level III Investments	The following tables present a summary of changes in the fair value of the Company’s Level III investments for the three and nine month periods ended June 30, 2018 and 2017 (in thousands). Fair Value Measurement Using Significant Unobservable Inputs (Level III) Three Months Ended June 30, 2018 June 30, 2017 Beginning balance $ 7,767 $ 8,735 Purchases, sales, issuances, settlements, net — — Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income (loss) 2 (21 ) Transfers in and/or out of Level III — — $ 7,769 $ 8,714 Fair Value Measurement Using Significant Unobservable Inputs (Level III) Nine Months Ended June 30, 2018 June 30, 2017 Beginning balance $ 7,224 $ 7,485 Purchases, sales, issuances, settlements, net 500 756 Total unrealized gain (loss): Included in earnings — — Included in other comprehensive income 45 473 Transfers in and/or out of Level III — — $ 7,769 $ 8,714
Summary of Additional Quantitative Information about Assets Measured at Fair Value on a Nonrecurring Basis	The following tables present additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range June 30, 2018 Impaired loans $ 11,902 Appraisal of collateral (1) Appraisal adjustments (2) 0% to 35% (25.4%) Foreclosed real estate owned 1,368 Appraisal of collateral (1), (3) Appraisal adjustments (2) 20% to 46% (20.0%) Mortgage servicing rights 210 Discounted cash flow Discount rate 11.0% (11.0%) Prepayment speeds 8% to 31% (12.1%) Quantitative Information about Level 3 Fair Value Measurements (in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range 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% (22.0%) Mortgage servicing rights 232 Discounted cash flow Discount rate 11.0% (11.0%) Prepayment speeds 11% to 30% (15.9%) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable. (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
Schedule of Estimate of Fair Value Using Methodologies	The fair values presented represent the Company’s best estimate of fair value using the methodologies discussed below (in thousands). June 30, 2018 Carrying Level I Level II Level III Total Fair Value Financial assets: Cash and cash equivalents $ 37,907 $ 37,907 $ — $ — $ 37,907 Certificates of deposit 500 — — 500 500 Investment and mortgage backed securities available for sale 371,109 21 363,319 7,769 371,109 Loans receivable, net 1,301,589 — — 1,271,806 1,271,806 Accrued interest receivable 6,265 6,265 — — 6,265 Regulatory stock 16,597 16,597 — — 16,597 Mortgage servicing rights 210 — — 210 210 Derivatives 2,408 — 2,408 — 2,408 Bank owned life insurance 38,380 38,380 — — 38,380 Financial liabilities: Deposits $ 1,269,866 $ 743,464 $ — $ 522,313 $ 1,265,777 Short-term borrowings 220,006 220,006 — — 220,006 Other borrowings 131,119 — — 129,971 129,971 Advances by borrowers for taxes and insurance 14,802 14,802 — — 14,802 Accrued interest payable 1,302 1,302 — — 1,302 September 30, 2017 Carrying 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

Accumulated Other Comprehensi31

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Summary of Activity in Accumulated Other Comprehensive Income (Loss)	The activity in accumulated other comprehensive loss for the three and nine months period ended June 30, 2018 and 2017 is as follows (in thousands): Accumulated Other Comprehensive Loss Defined Benefit Pension Plan Unrealized (Losses) on Securities Available for Sale Derivatives Total Balance at March 31, 2018 $ (752 ) $ (7,808 ) $ 1,825 $ (6,735 ) Other comprehensive income (loss) before reclassifications — (1,376 ) 188 (1,188 ) Amounts reclassified from accumulated other comprehensive loss — — (112 ) (112 ) Reclassification of certain income tax effects from accumulated other comprehensive income (loss) — — — — Period change — (1,376 ) 76 (1,300 ) Balance at June 30, 2018 $ (752 ) $ (9,184 ) $ 1,901 $ (8,035 ) Balance at March 31, 2017 $ (1,266 ) $ (2,020 ) $ 922 $ (2,364 ) Other comprehensive income (loss) before reclassifications — 940 (149 ) 791 Amounts reclassified from accumulated other comprehensive loss, net of tax 12 (195 ) (2 ) (185 ) Period change 12 745 (151 ) 606 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 ) Accumulated Other Comprehensive Income/(Loss) Defined Benefit Pension Plan Unrealized Gains (Losses) on Securities Available for Sale Derivatives Total Balance at September 30, 2017 $ (628 ) $ (927 ) $ 801 $ (754 ) Other comprehensive income (loss) before reclassifications — (7,764 ) 1,076 (6,688 ) Amounts reclassified from accumulated other comprehensive loss, net of tax — (57 ) (190 ) (247 ) Reclassification of certain income tax effects from accumulated other comprehensive income (124 ) (436 ) 214 (346 ) Period change (124 ) (8,257 ) 1,100 (7,281 ) Balance at June 30, 2018 $ (752 ) $ (9,184 ) $ 1,901 $ (8,035 ) Balance at September 30, 2016 $ (6,083 ) $ 3,952 $ 299 $ (1,832 ) Other comprehensive income before reclassifications 4,714 (5,032 ) 470 152 Amounts reclassified from accumulated other comprehensive loss, net of tax 115 (195 ) 2 (78 ) Period change 4,829 (5,227 ) 472 74 Balance at June 30, 2017 $ (1,254 ) $ (1,275 ) $ 771 $ (1,758 )
Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss)	The following table presents significant amounts reclassified out of each component of accumulated other comprehensive loss for the three and nine month periods ended June 30, 2018 and 2017 (in thousands): Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss for the Three Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2018 2017 Securities available for sale Net securities gains reclassified into earnings $ — $ 295 Gains on sale of investments, net Related income tax expense — (100 ) Income taxes Net effect on accumulated other comprehensive loss for the period — 195 Net of tax Defined benefit pension plan: Amortization of net (loss) gain and prior service costs — (23 ) Compensation and employee Related income tax expense — 11 Income taxes Net effect on accumulated other comprehensive loss for the period — (12 ) Net of tax Derivatives and hedging activities: Interest expense, effective portion 153 3 Interest expense Related income tax expense (41 ) (1 ) Income taxes Net effect on accumulated other comprehensive loss for the period 112 2 Net of tax Total reclassification for the period $ 112 $ 185 Amount Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss For the Nine Months Ended June 30, Affected Line Item in the Consolidated Statement of Income 2018 2017 Securities available for sale: Net securities gains reclassified into earnings $ 75 $ 295 Gain on sale of investments, net Related income tax expense (18 ) (100 ) Income taxes Net effect on accumulated other comprehensive loss for the period 57 195 Net of tax Defined benefit pension plan: Amoritization of net (loss) gain and prior services costs — (182 ) Compensation and employee benefits Related income tax expense — 67 Income taxes Net effect on accumulated other comprehensive loss for the period — (115 ) Net of tax Derivative and Hedging Activities: Interest expense, effective portion 252 (3 ) Interest expense Related income tax expense (62 ) 1 Income taxes Net effect on accumulated other comprehensive loss for the period 190 (2 ) Net of tax Total reclassification for the period $ 247 $ 78

Derivatives and Hedging Activit

Derivatives and Hedging Activities (Tables)	9 Months Ended
	Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Financial Instruments as well as their Classification on Consolidated Balance Sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheet as of June 30, 2018 and September 30, 2017 (in thousands). Fair Values of Derivative Instruments Asset Derivatives As of June 30, 2018 As of September 30, 2017 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest Rate Products Other Assets $ 2,408 Other Assets $ 1,215
Schedule of Pre-Tax Net Gains (Losses) of Cash flow Hedges	The tables below present the pre-tax net gains (losses) of the Company’s cash flow hedges for the three and nine month periods ended June 30, 2018 and 2017, respectively, and where they were recorded in the Consolidated Statement of Income, (in thousands). Derivatives in Cash Flow Hedging Relationships Loss Recognized in OCI on Derivative (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Three Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Three Months Ended June 30, 2018 2017 2018 2017 2018 2017 Interest Rate Products $ 249 $ (231 ) Interest expense $ 153 $ 3 Other non-interest income $ — $ — Ending balance of OCI Total $ 249 $ (231 ) $ 153 $ 3 $ — $ — Derivatives in Cash Flow Hedging Relationships Gain Recognized in OCI on Derivative (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (Loss)Reclassified from Accumulated OCI into Income (Effective Portion) Nine Months Ended June 30, Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) Nine Months Ended June 30, 2018 2017 2018 2017 2018 2017 Interest Rate Products $ 1,445 $ 873 Interest expense $ 252 $ (3 ) Other non-interest income $ — $ — Ending balance of OCI Total $ 1,445 $ 873 $ 252 $ (3 ) $ — $ —

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
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): For the Three Months Ended June 30, 2018 2017 Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 806 24.2 % $ 751 34.0 % Income from bank-owned life insurance (61 ) (2.2 %) (88 ) (4.8 %) Tax-exempt income (112 ) (4.0 %) (210 ) (11.4 %) Low-income housing credits (53 ) (1.9 %) (25 ) (1.4 %) Tax rate change (98 ) (3.5 %) 0.0 % Other, net 18 0.6 % 20 1.0 % Actual tax expense and effective rate $ 500 13.3 % $ 448 17.5 % For the Nine Months Ended June 30, 2018 2017 Amount % of Pretax Income Amount % of Pretax Income Provision at statutory rate $ 2,077 24.2 % $ 2,168 34.0 % Income from bank-owned life insurance (183 ) (3.5 %) (264 ) (6.3 %) Tax-exempt income (381 ) (7.3 %) (642 ) (15.4 %) Low-income housing credits (96 ) (1.8 %) (148 ) (3.6 %) Tax rate change 3,682 70.2 % — 0.0 % Other, net 23 0.4 % (63 ) (1.5 %) Actual tax expense and effective rate $ 5,122 82.3 % $ 1,051 7.2 %

Nature of Operations and Basi34

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Jun. 30, 2018
ESSA Advisory Services, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage ownership of wholly owned subsidiary	100.00%

Earnings Per Share - Compositio

Earnings Per Share - Composition of the Weighted-Average Common Shares (Denominator) Used in the Basic and Diluted Earnings per Share Computation (Detail) - shares	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Weighted-average common shares outstanding	18,133,095	18,133,095	18,133,095	18,133,095
Average treasury stock shares	(6,360,627)	(6,547,695)	(6,447,516)	(6,629,264)
Average unearned ESOP shares	(831,689)	(876,964)	(843,049)	(888,324)
Average unearned non-vested shares	(29,310)	(29,580)	(43,302)	(43,801)
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	10,911,469	10,678,856	10,799,228	10,571,706
Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share		332
Additional common stock equivalents (stock options) used to calculate diluted earnings per share	11,391	63,820	9,395	68,519
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	10,922,860	10,743,008	10,808,623	10,640,225

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - Stock Option [Member] - $ / shares	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	45,642	50,310
Average weighted price per share of anti-dilutive shares	$ 15.37	$ 14.38

Recent Accounting Pronounceme37

Recent Accounting Pronouncements - Additional Information (Detail) - ASU 2016-02, Leases [Member] - Maximum [Member]	9 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Estimated percentage increase in assets from recognition of leases	1.00%
Estimated percentage increase in liabilities from recognition of leases	1.00%

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	$ 382,733	$ 391,857
Available for sale, Gross Unrealized Gains	772	2,392
Available for sale, Gross Unrealized Losses	(12,396)	(3,797)
Available for sale, Fair Value	371,109	390,452
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	136,467	119,333
Available for sale, Gross Unrealized Gains	19	207
Available for sale, Gross Unrealized Losses	(4,672)	(1,203)
Available for sale, Fair Value	131,814	118,337
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	97,624	98,668
Available for sale, Gross Unrealized Gains	13	177
Available for sale, Gross Unrealized Losses	(3,700)	(808)
Available for sale, Fair Value	93,937	98,037
Governmental National Mortgage Association Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	19,986	17,609
Available for sale, Gross Unrealized Gains		43
Available for sale, Gross Unrealized Losses	(685)	(203)
Available for sale, Fair Value	19,301	17,449
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	254,077	235,610
Available for sale, Gross Unrealized Gains	32	427
Available for sale, Gross Unrealized Losses	(9,057)	(2,214)
Available for sale, Fair Value	245,052	233,823
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	50,182	64,382
Available for sale, Gross Unrealized Gains	541	1,522
Available for sale, Gross Unrealized Losses	(1,229)	(546)
Available for sale, Fair Value	49,494	65,358
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	12,853	18,615
Available for sale, Gross Unrealized Gains	7	61
Available for sale, Gross Unrealized Losses	(157)	(5)
Available for sale, Fair Value	12,703	18,671
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	44,582	49,025
Available for sale, Gross Unrealized Gains	187	335
Available for sale, Gross Unrealized Losses	(1,150)	(618)
Available for sale, Fair Value	43,619	48,742
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	21,014	24,200
Available for sale, Gross Unrealized Gains	5	47
Available for sale, Gross Unrealized Losses	(799)	(414)
Available for sale, Fair Value	20,220	23,833
Total Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	382,708	391,832
Available for sale, Gross Unrealized Gains	772	2,392
Available for sale, Gross Unrealized Losses	(12,392)	(3,797)
Available for sale, Fair Value	371,088	390,427
Equity Securities-Financial Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Amortized Cost	25	25
Available for sale, Gross Unrealized Losses	(4)
Available for sale, Fair Value	$ 21	$ 25

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	$ 728
Due after one year through five years, Amortized Cost	36,878
Due after five years through ten years, Amortized Cost	103,013
Due after ten years, Amortized Cost	242,089
Total, Amortized Cost	382,708
Due in one year or less, Fair Value	729
Due after one year through five years, Fair Value	36,436
Due after five years through ten years, Fair Value	100,186
Due after ten years, Fair Value	233,737
Total, Fair Value	$ 371,088

Investment Securities - Additio

Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortized Cost And Fair Value Debt Securities [Abstract]
Realized gross gains	$ 0	$ 299,000	$ 300,000	$ 299,000
Realized gross losses	$ 0	4,000	225,000	4,000
Proceeds from the sale of investment securities		$ 17,400,000	$ 22,100,000	$ 17,400,000

Investment Securities - Sched41

Investment Securities - Schedule of Gross Unrealized Losses and Fair Value (Detail) $ in Thousands	Jun. 30, 2018USD ($)Security	Sep. 30, 2017USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	256	174
Fair Value, Less than Twelve Months	$ 181,992	$ 149,633
Gross Unrealized Losses, Less than Twelve Months	(4,604)	(1,225)
Fair Value, Twelve Months or Greater	141,095	83,272
Gross Unrealized Losses, Twelve Months or Greater	(7,792)	(2,572)
Fair Value, Total	323,087	232,905
Gross Unrealized Losses, Total	$ (12,396)	$ (3,797)
Fannie Mae [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	90	55
Fair Value, Less than Twelve Months	$ 73,711	$ 61,852
Gross Unrealized Losses, Less than Twelve Months	(1,854)	(558)
Fair Value, Twelve Months or Greater	51,557	20,679
Gross Unrealized Losses, Twelve Months or Greater	(2,818)	(645)
Fair Value, Total	125,268	82,531
Gross Unrealized Losses, Total	$ (4,672)	$ (1,203)
Freddie Mac [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	68	39
Fair Value, Less than Twelve Months	$ 51,483	$ 38,913
Gross Unrealized Losses, Less than Twelve Months	(1,681)	(354)
Fair Value, Twelve Months or Greater	37,623	16,427
Gross Unrealized Losses, Twelve Months or Greater	(2,019)	(454)
Fair Value, Total	89,106	55,340
Gross Unrealized Losses, Total	$ (3,700)	$ (808)
Governmental National Mortgage Association [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	17	11
Fair Value, Less than Twelve Months	$ 12,872	$ 6,669
Gross Unrealized Losses, Less than Twelve Months	(297)	(41)
Fair Value, Twelve Months or Greater	6,429	6,903
Gross Unrealized Losses, Twelve Months or Greater	(388)	(162)
Fair Value, Total	19,301	13,572
Gross Unrealized Losses, Total	$ (685)	$ (203)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	26	25
Fair Value, Less than Twelve Months	$ 11,231	$ 10,944
Gross Unrealized Losses, Less than Twelve Months	(167)	(59)
Fair Value, Twelve Months or Greater	17,983	17,425
Gross Unrealized Losses, Twelve Months or Greater	(1,062)	(487)
Fair Value, Total	29,214	28,369
Gross Unrealized Losses, Total	$ (1,229)	$ (546)
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	6	3
Fair Value, Less than Twelve Months	$ 12,027	$ 8,995
Gross Unrealized Losses, Less than Twelve Months	(157)	(5)
Fair Value, Total	12,027	8,995
Gross Unrealized Losses, Total	$ (157)	$ (5)
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	29	22
Fair Value, Less than Twelve Months	$ 19,368	$ 15,119
Gross Unrealized Losses, Less than Twelve Months	(425)	(104)
Fair Value, Twelve Months or Greater	9,806	8,032
Gross Unrealized Losses, Twelve Months or Greater	(725)	(514)
Fair Value, Total	29,174	23,151
Gross Unrealized Losses, Total	$ (1,150)	$ (618)
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	19	19
Fair Value, Less than Twelve Months	$ 1,279	$ 7,141
Gross Unrealized Losses, Less than Twelve Months	(19)	(104)
Fair Value, Twelve Months or Greater	17,697	13,806
Gross Unrealized Losses, Twelve Months or Greater	(780)	(310)
Fair Value, Total	18,976	20,947
Gross Unrealized Losses, Total	$ (799)	$ (414)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities | Security	1
Fair Value, Less than Twelve Months	$ 21
Gross Unrealized Losses, Less than Twelve Months	(4)
Fair Value, Total	21
Gross Unrealized Losses, Total	$ (4)

Loans Receivable, Net and All42

Loans Receivable, Net and Allowance for Loan Losses - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Real estate loans:
Total Loans	$ 1,312,719		$ 1,246,046
Less allowance for loan losses	11,130	$ 10,510	9,365	$ 9,221	$ 9,366	$ 9,056
Net loans	1,301,589		1,236,681
Residential Real Estate Loans [Member]
Real estate loans:
Total Loans	581,620		586,708
Less allowance for loan losses	3,536	3,755	3,878	4,206	4,130	4,426
Construction Real Estate Loans [Member]
Real estate loans:
Total Loans	5,042		3,097
Commercial Real Estate Loans [Member]
Real estate loans:
Total Loans	396,762		318,323
Less allowance for loan losses	3,008	2,821	1,758	1,366	1,038	852
Commercial Loans [Member]
Real estate loans:
Total Loans	49,615		44,129
Less allowance for loan losses	1,384	1,219	987	986	951	882
Obligations of States and Political Subdivisions [Member]
Real estate loans:
Total Loans	67,468		58,079
Less allowance for loan losses	292	269	248	246	244	215
Home Equity Loans and Lines of Credit [Member]
Real estate loans:
Total Loans	45,043		46,219
Less allowance for loan losses	408	401	470	494	445	455
Auto Loans [Member]
Real estate loans:
Total Loans	164,437		186,646
Less allowance for loan losses	1,870	1,904	1,836	1,866	1,908	1,880
Other [Member]
Real estate loans:
Total Loans	2,732		2,845
Less allowance for loan losses	$ 23	$ 21	$ 21	$ 23	$ 24	$ 25

Loans Receivable, Net and All43

Loans Receivable, Net and Allowance for Loan Losses - Changes in Accretable Yield for Purchased Credit-Impaired Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Receivables [Abstract]
Balance at beginning of period	$ 574	$ 460	$ 471	$ 478
Reclassification, new additions and other		33	681	151
Accretion	(282)	(32)	(860)	(168)
Balance at end of period	$ 292	$ 461	$ 292	$ 461

Loans Receivable, Net and All44

Loans Receivable, Net and Allowance for Loan Losses - Summary of Additional Information Regarding Loans Acquired and Accounted (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,312,719	$ 1,246,046
Loans Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,183	5,490
Carrying amount	$ 2,526	$ 4,388

Loans Receivable, Net and All45

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,312,719	$ 1,246,046
Individually Evaluated for Impairment	12,121	15,576
Collectively Evaluated for Impairment	1,298,072	1,226,082
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,526	4,388
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	581,620	586,708
Individually Evaluated for Impairment	5,217	6,202
Collectively Evaluated for Impairment	576,403	580,506
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	396,762	318,323
Individually Evaluated for Impairment	6,227	7,211
Collectively Evaluated for Impairment	388,436	307,337
Commercial Real Estate Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,099	3,775
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,042	3,097
Collectively Evaluated for Impairment	5,042	3,097
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	49,615	44,129
Individually Evaluated for Impairment	93	1,385
Collectively Evaluated for Impairment	49,423	42,461
Commercial Loans [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	99	283
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	67,468	58,079
Collectively Evaluated for Impairment	67,468	58,079
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	45,043	46,219
Individually Evaluated for Impairment	125	176
Collectively Evaluated for Impairment	44,590	45,713
Home Equity Loans and Lines of Credit [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	328	330
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	164,437	186,646
Individually Evaluated for Impairment	433	572
Collectively Evaluated for Impairment	164,004	186,074
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,732	2,845
Individually Evaluated for Impairment	26	30
Collectively Evaluated for Impairment	$ 2,706	$ 2,815

Loans Receivable, Net and All46

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Investment and Unpaid Principal Balances for Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 12,121		$ 12,121		$ 15,576
Unpaid Principal Balance	16,147		16,147		21,157
Associated Allowance	219		219		345
Average Recorded Investment	12,782	$ 17,234	13,931	$ 19,530
Interest	84	101	293	362
With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,755		10,755		13,297
Unpaid Principal Balance	14,588		14,588		17,232
Average Recorded Investment	11,342	15,246	12,341	17,077
Interest	84	100	293	355
With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,366		1,366		2,279
Unpaid Principal Balance	1,559		1,559		3,925
Associated Allowance	219		219		345
Average Recorded Investment	1,440	1,988	1,590	2,453
Interest		1		7
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,217		5,217		6,202
Unpaid Principal Balance	7,008		7,008		7,994
Associated Allowance	118		118		154
Average Recorded Investment	5,180	6,184	5,524	7,444
Interest	6	9	21	30
Residential Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	4,089		4,089		4,392
Unpaid Principal Balance	5,703		5,703		5,730
Average Recorded Investment	3,968	4,800	4,192	5,633
Interest	6	9	21	30
Residential Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	1,128		1,128		1,810
Unpaid Principal Balance	1,305		1,305		2,264
Associated Allowance	118		118		154
Average Recorded Investment	1,212	1,384	1,332	1,811
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,227		6,227		7,211
Unpaid Principal Balance	7,972		7,972		10,589
Associated Allowance					19
Average Recorded Investment	6,576	8,804	6,804	9,758
Interest	70	61	211	233
Commercial Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	6,227		6,227		7,191
Unpaid Principal Balance	7,972		7,972		9,396
Average Recorded Investment	6,564	8,502	6,787	9,428
Interest	70	61	211	233
Commercial Real Estate Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment					20
Unpaid Principal Balance					1,193
Associated Allowance					19
Average Recorded Investment	12	302	17	330
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	93		93		1,385
Unpaid Principal Balance	353		353		1,575
Average Recorded Investment	445	1,584	970	1,678
Interest	8	30	59	92
Commercial Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	93		93		1,385
Unpaid Principal Balance	353		353		1,575
Average Recorded Investment	445	1,584	970	1,638
Interest	8	30	59	92
Commercial Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment				40
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	125		125		176
Unpaid Principal Balance	140		140		258
Associated Allowance	3		3
Average Recorded Investment	159	212	194	247
Interest			1
Home Equity Loans and Lines of Credit [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	99		99		176
Unpaid Principal Balance	114		114		258
Average Recorded Investment	133	208	181	243
Interest			1
Home Equity Loans and Lines of Credit [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26		26
Unpaid Principal Balance	26		26
Associated Allowance	3		3
Average Recorded Investment	26	4	13	4
Auto Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	433		433		572
Unpaid Principal Balance	641		641		705
Associated Allowance	98		98		172
Average Recorded Investment	395	442	411	395
Interest		1	1	7
Auto Loans [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	221		221		123
Unpaid Principal Balance	413		413		237
Average Recorded Investment	205	144	183	127
Interest			1
Auto Loans [Member] | With an Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	212		212		449
Unpaid Principal Balance	228		228		468
Associated Allowance	98		98		172
Average Recorded Investment	190	298	228	268
Interest		1		7
Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26		26		30
Unpaid Principal Balance	33		33		36
Average Recorded Investment	27	8	28	8
Other [Member] | With no Specific Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26		26		30
Unpaid Principal Balance	33		33		$ 36
Average Recorded Investment	$ 27	$ 8	$ 28	$ 8

Loans Receivable, Net and All47

Loans Receivable, Net and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Criteria in internal rating system			Ten-point
Categories considered as not criticized			six
Days past due over which loans are considered as substandard			90 days
Minimum internal review amount	$ 750,000		$ 750,000
Minimum external review amount	$ 1,000,000		$ 1,000,000
Number of troubled debt restructuring loans granted terms concessions | Contract	3	2	1	1
Troubled debt restructurings granted terms concession	$ 20,000	$ 206,000	$ 107,000	$ 133,000
Number of troubled debt restructuring loans granted terms and rate concessions | Contract		1	6	5
Troubled debt restructurings granted terms and rate concession		$ 336,000	$ 270,000	$ 539,000
Number of Contracts | Contract		3		8
Number of troubled debt restructuring loans granted interest rate concession | Contract				2
Troubled debt restructurings loans granted interest rate concession				$ 357,000
Number of troubled debt restructurings, loan modified, defaulted within one year of modification | Contract	0	0	1	0
Troubled debt restructurings, loan modified, defaulted within one year of modification			$ 72,000
Consumer Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Foreclosed assets	$ 1,200,000		1,200,000
Formal foreclosure proceeding assets	$ 3,000,000		$ 3,000,000

Loans Receivable, Net and All48

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio, Internal Risk Rating System (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 1,301,589	$ 1,236,681
Commercial And Municipal Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	513,845	420,531
Commercial And Municipal Portfolio Segment | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	396,762	318,323
Commercial And Municipal Portfolio Segment | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	49,615	44,129
Commercial And Municipal Portfolio Segment | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	67,468	58,079
Commercial And Municipal Portfolio Segment | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	488,434	399,629
Commercial And Municipal Portfolio Segment | Pass [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	373,124	300,554
Commercial And Municipal Portfolio Segment | Pass [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	47,842	40,996
Commercial And Municipal Portfolio Segment | Pass [Member] | Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	67,468	58,079
Commercial And Municipal Portfolio Segment | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	8,610	3,408
Commercial And Municipal Portfolio Segment | Special Mention [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	8,601	3,376
Commercial And Municipal Portfolio Segment | Special Mention [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	9	32
Commercial And Municipal Portfolio Segment | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	16,801	17,494
Commercial And Municipal Portfolio Segment | Substandard [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	15,037	14,393
Commercial And Municipal Portfolio Segment | Substandard [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loan, total	$ 1,764	$ 3,101

Loans Receivable, Net and All49

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Performing or Non-Performing Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,301,589	$ 1,236,681
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	798,874	825,515
Purchase Credit Impaired [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	328	330
Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	792,273	817,506
Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,273	7,679
Residential Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	581,620	586,708
Residential Real Estate Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	576,193	580,116
Residential Real Estate Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,427	6,592
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,042	3,097
Commercial Real Estate Loans [Member] | Performing [Member] | Construction Real Estate Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,042	3,097
Home Equity Loans and Lines of Credit [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	45,043	46,219
Home Equity Loans and Lines of Credit [Member] | Purchase Credit Impaired [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	328	330
Home Equity Loans and Lines of Credit [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	44,423	45,576
Home Equity Loans and Lines of Credit [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	292	313
Auto Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	164,437	186,646
Auto Loans [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	163,910	185,910
Auto Loans [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	527	736
Other [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,732	2,845
Other [Member] | Performing [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,705	2,807
Other [Member] | Nonperforming [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 27	$ 38

Loans Receivable, Net and All50

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio Summarized by Aging Categories (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 1,298,292	$ 1,227,102
31-60 Days Past Due	2,461	3,597
61-89 Days Past Due	997	472
Non-accrual	8,443	10,487
Total Past Due	11,901	14,556
Purchased Credit Impaired, Accruing	258	612
Purchased Credit Impaired, Nonaccrual	2,268	3,776
Total Loans	1,312,719	1,246,046
Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	574,121	577,034
31-60 Days Past Due	1,101	2,661
61-89 Days Past Due	971	421
Non-accrual	5,427	6,592
Total Past Due	7,499	9,674
Total Loans	581,620	586,708
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	5,042	3,097
Total Loans	5,042	3,097
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	392,210	312,098
31-60 Days Past Due	320	172
Non-accrual	2,133	2,278
Total Past Due	2,453	2,450
Purchased Credit Impaired, Accruing	258	612
Purchased Credit Impaired, Nonaccrual	1,841	3,163
Total Loans	396,762	318,323
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	49,439	43,298
31-60 Days Past Due	40	18
Non-accrual	37	530
Total Past Due	77	548
Purchased Credit Impaired, Nonaccrual	99	283
Total Loans	49,615	44,129
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	67,468	58,079
Total Loans	67,468	58,079
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	44,394	45,460
31-60 Days Past Due	29	101
61-89 Days Past Due		15
Non-accrual	292	313
Total Past Due	321	429
Purchased Credit Impaired, Nonaccrual	328	330
Total Loans	45,043	46,219
Auto Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	162,931	185,247
31-60 Days Past Due	953	631
61-89 Days Past Due	26	32
Non-accrual	527	736
Total Past Due	1,506	1,399
Total Loans	164,437	186,646
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,687	2,789
31-60 Days Past Due	18	14
61-89 Days Past Due		4
Non-accrual	27	38
Total Past Due	45	56
Total Loans	$ 2,732	$ 2,845

Loans Receivable, Net and All51

Loans Receivable, Net and Allowance for Loan Losses - Summary of Primary Segments of ALL (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	$ 10,510	$ 9,366	$ 9,365	$ 9,056
Charge-offs	(501)	(1,132)	(1,862)	(2,808)
Recoveries	146	237	552	723
Provision	975	750	3,075	2,250
Balance, End of period	11,130	9,221	11,130	9,221
Individually evaluated for impairment	219		219		$ 345
Collectively evaluated for impairment	10,911		10,911		9,020
Residential Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	3,755	4,130	3,878	4,426
Charge-offs	(120)	(23)	(215)	(390)
Recoveries	3	11	9	18
Provision	(102)	88	(136)	152
Balance, End of period	3,536	4,206	3,536	4,206
Individually evaluated for impairment	118		118		154
Collectively evaluated for impairment	3,418		3,418		3,724
Commercial Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	2,821	1,038	1,758	852
Charge-offs	(12)	(649)	(27)	(867)
Recoveries		9	2	19
Provision	199	968	1,275	1,362
Balance, End of period	3,008	1,366	3,008	1,366
Individually evaluated for impairment					19
Collectively evaluated for impairment	3,008		3,008		1,739
Commercial Real Estate Loans [Member] | Construction Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	33	30	23	13
Provision	10	3	20	20
Balance, End of period	43	33	43	33
Collectively evaluated for impairment	43		43		23
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,219	951	987	882
Charge-offs			(137)	(20)
Recoveries		1	10	1
Provision	165	34	524	123
Balance, End of period	1,384	986	1,384	986
Collectively evaluated for impairment	1,384		1,384		987
Obligations of States and Political Subdivisions [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	269	244	248	215
Provision	23	2	44	31
Balance, End of period	292	246	292	246
Collectively evaluated for impairment	292		292		248
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	401	445	470	455
Charge-offs	(41)		(47)	(6)
Recoveries	33	2	38	5
Provision	15	47	(53)	40
Balance, End of period	408	494	408	494
Individually evaluated for impairment	3		3
Collectively evaluated for impairment	405		405		470
Auto Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	1,904	1,908	1,836	1,880
Charge-offs	(328)	(460)	(1,415)	(1,521)
Recoveries	109	213	490	673
Provision	185	205	959	834
Balance, End of period	1,870	1,866	1,870	1,866
Individually evaluated for impairment	98		98		172
Collectively evaluated for impairment	1,772		1,772		1,664
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	21	24	21	25
Charge-offs			(21)	(4)
Recoveries	1	1	3	7
Provision	1	(2)	20	(5)
Balance, End of period	23	23	23	23
Collectively evaluated for impairment	23		23		21
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, Beginning of period	87	596	144	308
Provision	479	(595)	422	(307)
Balance, End of period	566	$ 1	566	$ 1
Collectively evaluated for impairment	$ 566		$ 566		$ 144

Loans Receivable, Net and All52

Loans Receivable, Net and Allowance for Loan Losses - Summary of Troubled Debt Restructuring Granted (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		3		8
Real Estate Loans [Member] | Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		2	2	5
Pre-Modification Outstanding Recorded Investment		$ 529	$ 243	$ 902
Post-Modification Outstanding Recorded Investment		$ 529	$ 235	$ 902
Real Estate Loans [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			1	1
Pre-Modification Outstanding Recorded Investment			$ 107	$ 93
Post-Modification Outstanding Recorded Investment			$ 107	$ 93
Auto Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	1	4	1
Pre-Modification Outstanding Recorded Investment	$ 20	$ 13	$ 35	$ 13
Post-Modification Outstanding Recorded Investment	$ 20	$ 13	$ 35	$ 13
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract				1
Pre-Modification Outstanding Recorded Investment				$ 21
Post-Modification Outstanding Recorded Investment				$ 21
Troubled Debt Restructurings [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	3	7	8
Pre-Modification Outstanding Recorded Investment	$ 20	$ 542	$ 385	$ 1,029
Post-Modification Outstanding Recorded Investment	$ 20	$ 542	$ 377	$ 1,029

Deposits - Schedule of Deposits

Deposits - Schedule of Deposits by Major Classifications (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Banking And Thrift [Abstract]
Non-interest bearing demand accounts	$ 164,777	$ 160,125
Interest bearing demand accounts	169,521	208,369
Money market accounts	267,990	253,949
Savings and club accounts	141,176	141,521
Certificates of deposit	526,402	510,897
Total	$ 1,269,866	$ 1,274,861

Net Periodic Benefit Cost-Def54

Net Periodic Benefit Cost-Defined Benefit Plan - Summary of the Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Compensation Related Costs [Abstract]
Service Cost		$ 69		$ 447
Interest Cost	$ 174	208	$ 523	651
Expected return on plan assets	(298)	(348)	(895)	(1,037)
Amortization of unrecognized loss		23		182
Net periodic benefit cost	$ (124)	$ (48)	$ (372)	$ 243

Net Periodic Benefit Cost-Def55

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

Equity Incentive Plan - Additio

Equity Incentive Plan - Additional Information (Detail) - USD ($)	Dec. 06, 2017	Oct. 23, 2017	Mar. 29, 2017	Dec. 13, 2016	Mar. 04, 2016	May 20, 2015	Jul. 22, 2014	Apr. 01, 2013	May 23, 2008	Jun. 30, 2018	Jun. 30, 2017
Compensation Related Costs Disclosure [Line Items]
Stock option granted										0
Option vesting period										5 years
Option expiration period										10 years
Share-based compensation expense										$ 287,000	$ 245,000
Equity Incentive Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant										2,377,326
2016 Plan [Member]
Compensation Related Costs Disclosure [Line Items]
Common stock issuance, Grant										250,000
Further number of shares, grants										0
Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Number of available shares										1,698,090
Restricted Stock [Member]
Compensation Related Costs Disclosure [Line Items]
Number of available shares										679,236
Restricted stock granted	24,278	1,250	3,296	20,675	23,491	21,843	19,880	30,000	590,320
Share-based compensation expense										$ 276,000	$ 231,000
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
Expected future expense										$ 20,000
Remaining vesting periods										3 months
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] | October 23, 2017 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period										23 months
Restricted Stock [Member] | December 6, 2017 [Member]
Compensation Related Costs Disclosure [Line Items]
Restricted shares vesting period										46 months
Restricted Stock [Member] | March 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 106,000
Remaining vesting periods										1 year 3 months
Restricted Stock [Member] | March 2017 [Member] | Tranche One [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 12,000
Remaining vesting periods										2 years 3 months
Outstanding nonvested restricted stock										(1,296)
Restricted Stock [Member] | March 2017 [Member] | Tranche Two [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 5,000
Remaining vesting periods										3 months
Outstanding nonvested restricted stock										(2,000)
Restricted Stock [Member] | December 2016 [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 201,000
Remaining vesting periods										2 years 3 months
Restricted Stock [Member] | October 2017 [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 12,000
Remaining vesting periods										1 year 3 months
Restricted Stock [Member] | December 2017 [Member]
Compensation Related Costs Disclosure [Line Items]
Expected future expense										$ 326,000
Remaining vesting periods										3 years 3 months
Non Qualified Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Stock option granted									1,140,469
Incentive Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]
Stock option granted									317,910

Equity Incentive Plan - Schedul

Equity Incentive Plan - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options, Outstanding, September 30, 2017	294,646
Number of Stock Options, Granted	0
Number of Stock Options, Exercised	294,646
Number of Stock Options, Forfeited	0
Number of Stock Options, Outstanding, June 30, 2018		294,646
Weighted-average Exercise Price, Outstanding, September 30, 2017	$ 12.35
Weighted-average Exercise Price, Granted	0
Weighted-average Exercise Price, Exercised	12.35
Weighted-average Exercise Price, Forfeited	$ 0
Weighted-average Exercise Price, Outstanding, June 30, 2018		$ 12.35
Weighted-average Remaining Contractual Term (in years), Outstanding	0 years	8 months 1 day
Weighted-average Remaining Contractual Term (in years), Granted	0 years
Weighted-average Remaining Contractual Term (in years), Exercised	0 years
Weighted-average Remaining Contractual Term (in years), Forfeited	0 years
Weighted-average Remaining Contractual Term (in years), Exercisable	0 years
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 987
Aggregate Intrinsic Value, Granted	0
Aggregate Intrinsic Value, Exercised	0
Aggregate Intrinsic Value, Forfeited	$ 0
Aggregate Intrinsic Value, Outstanding, Ending Balance		$ 987

Equity Incentive Plan - Sched58

Equity Incentive Plan - Schedule of Restricted Stock Option Activity (Detail) - Restricted Stock [Member]	9 Months Ended
	Jun. 30, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Restricted Stock, Nonvested at September 30, 2017 | shares	34,692
Number of Restricted Stock, Granted | shares	25,528
Number of Restricted Stock, Vested | shares	(1,000)
Number of Restricted Stock, Forfeited | shares	(2,535)
Number of Restricted Stock, Nonvested at June 30, 2018 | shares	56,685
Weighted-average Grant Date Fair Value, Nonvested at September 30, 2017 | $ / shares	$ 14.89
Weighted-average Grant Date Fair Value, Granted | $ / shares	15.86
Weighted-average Grant Date Fair Value, Vested | $ / shares	0
Weighted-average Grant Date Fair Value, Forfeited | $ / shares	14.79
Weighted-average Grant Date Fair Value, Nonvested at June 30, 2018 | $ / shares	$ 15.31

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Securities, Derivatives, Other Real Estate Owned and Impaired Loans Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Investment securities available for sale:
Total Securities	$ 371,109	$ 390,452
Derivatives and hedging activities:	2,408	1,215
Foreclosed real estate	1,368	1,424
Impaired loans	11,902	15,231
Mortgage servicing rights	210	232
Fair Value, Measurements, Nonrecurring [Member]
Investment securities available for sale:
Foreclosed real estate	1,368	1,424
Mortgage-Backed Securities [Member]
Investment securities available for sale:
Total Securities	245,052	233,823
Obligations of States and Political Subdivisions [Member]
Investment securities available for sale:
Total Securities	49,494	65,358
U.S. Government Agency Securities [Member]
Investment securities available for sale:
Total Securities	12,703	18,671
Corporate Obligations [Member]
Investment securities available for sale:
Total Securities	43,619	48,742
Other Debt Securities [Member]
Investment securities available for sale:
Total Securities	20,220	23,833
Equity Securities-Financial Services [Member]
Investment securities available for sale:
Total Securities	21	25
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Investment securities available for sale:
Total Securities	21	25
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities-Financial Services [Member]
Investment securities available for sale:
Total Securities	21	25
Significant Other Observable Inputs (Level 2) [Member]
Investment securities available for sale:
Total Securities	363,319	383,203
Derivatives and hedging activities:	2,408	1,215
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-Backed Securities [Member]
Investment securities available for sale:
Total Securities	245,052	233,823
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Investment securities available for sale:
Total Securities	49,494	65,358
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Securities [Member]
Investment securities available for sale:
Total Securities	12,703	18,671
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]
Investment securities available for sale:
Total Securities	35,850	41,518
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]
Investment securities available for sale:
Total Securities	20,220	23,833
Significant Unobservable Inputs (Level 3) [Member]
Investment securities available for sale:
Total Securities	7,769	7,224
Impaired loans	11,902	15,231
Mortgage servicing rights	210	232
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
Investment securities available for sale:
Foreclosed real estate	1,368	1,424
Significant Unobservable Inputs (Level 3) [Member] | Corporate Obligations [Member]
Investment securities available for sale:
Total Securities	$ 7,769	$ 7,224

Fair Value Measurement - Sche60

Fair Value Measurement - Schedule of Changes in Fair Value of Level III Investments (Detail) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 7,767	$ 8,735	$ 7,224	$ 7,485
Purchases, sales, issuances, settlements, net			500	756
Total unrealized gain (loss):
Included in other comprehensive income (loss)	2	(21)	45	473
Ending balance	$ 7,769	$ 8,714	$ 7,769	$ 8,714

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)Loan	Sep. 30, 2017USD ($)Loan
Fair Value Disclosures [Abstract]
Number of impaired loans | Loan	130	164
Impaired loans, carrying value	$ 12,100	$ 15,600
Impaired loans, valuation allowance	219	345
Impaired loans, net fair value	$ 11,900	$ 15,200

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable Input	Prepayment speeds	Prepayment speeds
Fair value input appraisal adjustments	12.20%	15.90%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	7.00%	11.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value input appraisal adjustments	28.00%	30.00%
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 11,902	$ 15,231
Impaired loans, Valuation Technique	Appraisal of collateral	Appraisal of collateral
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	25.30%	24.00%
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	35.00%	57.00%
Foreclosed Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 1,368	$ 1,424
Foreclosed real estate owned, Valuation Technique	Appraisal of collateral	Appraisal of collateral
Unobservable Input	Appraisal adjustments	Appraisal adjustments
Fair value input appraisal adjustments	23.20%	22.00%
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%	46.00%
Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Estimate	$ 210	$ 232
Mortgage servicing rights, Valuation Technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Unobservable Input	Discount rate	Discount rate
Fair value input appraisal adjustments	11.00%	11.00%

Fair Value Measurement - Sche63

Fair Value Measurement - Schedule of Estimate of Fair Value Using Methodologies (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Financial assets:
Investment and mortgage backed securities available for sale	$ 371,109	$ 390,452
Loans receivable, net	11,900	15,200
Mortgage servicing rights	210	232
Derivatives	2,408	1,215
Bank-owned life insurance	38,380	37,626
Financial liabilities:
Other borrowings	131,119	174,168
Advances by borrowers for taxes and insurance	14,802	5,163
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	21	25
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	363,319	383,203
Derivatives	2,408	1,215
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	7,769	7,224
Mortgage servicing rights	210	232
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	37,907	41,683
Certificates of deposit	500	500
Investment and mortgage backed securities available for sale	371,109	390,452
Loans receivable, net	1,301,589	1,236,681
Accrued interest receivable	6,265	6,149
Regulatory stock	16,597	13,832
Mortgage servicing rights	210	232
Derivatives	2,408	1,215
Bank-owned life insurance	38,380	37,626
Financial liabilities:
Deposits	1,269,866	1,274,861
Short-term borrowings	220,006	137,446
Other borrowings	131,119	174,168
Advances by borrowers for taxes and insurance	14,802	5,163
Accrued interest payable	1,302	1,043
Estimated Fair Value [Member]
Financial assets:
Cash and cash equivalents	37,907	41,683
Certificates of deposit	500	505
Investment and mortgage backed securities available for sale	371,109	390,452
Loans receivable, net	1,271,806	1,235,368
Accrued interest receivable	6,265	6,149
Regulatory stock	16,597	13,832
Mortgage servicing rights	210	232
Derivatives	2,408	1,215
Bank-owned life insurance	38,380	37,626
Financial liabilities:
Deposits	1,265,777	1,275,356
Short-term borrowings	220,006	137,446
Other borrowings	129,971	174,107
Advances by borrowers for taxes and insurance	14,802	5,163
Accrued interest payable	1,302	1,043
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	37,907	41,683
Investment and mortgage backed securities available for sale	21	25
Accrued interest receivable	6,265	6,149
Regulatory stock	16,597	13,832
Bank-owned life insurance	38,380	37,626
Financial liabilities:
Deposits	743,464	763,964
Short-term borrowings	220,006	137,446
Advances by borrowers for taxes and insurance	14,802	5,163
Accrued interest payable	1,302	1,043
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Investment and mortgage backed securities available for sale	363,319	383,203
Derivatives	2,408	1,215
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Certificates of deposit	500	505
Investment and mortgage backed securities available for sale	7,769	7,224
Loans receivable, net	1,271,806	1,235,368
Mortgage servicing rights	210	232
Financial liabilities:
Deposits	522,313	511,392
Other borrowings	$ 129,971	$ 174,107

Accumulated Other Comprehensi64

Accumulated Other Comprehensive Loss - Summary of Activity in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 182,727
Total other comprehensive (loss) income	$ (1,300)	$ 606	(6,935)	$ 74
Ending Balance	178,810		178,810
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(752)	(1,266)	(628)	(6,083)
Other comprehensive income (loss) before reclassifications				4,714
Amounts reclassified from accumulated other comprehensive loss, net of tax		12		115
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)			(124)
Total other comprehensive (loss) income		12	(124)	4,829
Ending Balance	(752)	(1,254)	(752)	(1,254)
Unrealized Gains (Losses) on Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(7,808)	(2,020)	(927)	3,952
Other comprehensive income (loss) before reclassifications	(1,376)	940	(7,764)	(5,032)
Amounts reclassified from accumulated other comprehensive loss, net of tax		(195)	(57)	(195)
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)			(436)
Total other comprehensive (loss) income	(1,376)	745	(8,257)	(5,227)
Ending Balance	(9,184)	(1,275)	(9,184)	(1,275)
Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	1,825	922	801	299
Other comprehensive income (loss) before reclassifications	188	(149)	1,076	470
Amounts reclassified from accumulated other comprehensive loss, net of tax	(112)	(2)	(190)	2
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)			214
Total other comprehensive (loss) income	76	(151)	1,100	472
Ending Balance	1,901	771	1,901	771
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(6,735)	(2,364)	(754)	(1,832)
Other comprehensive income (loss) before reclassifications	(1,188)	791	(6,688)	152
Amounts reclassified from accumulated other comprehensive loss, net of tax	(112)	(185)	(247)	(78)
Reclassification of certain income tax effects from accumulated other comprehensive income (loss)			(346)
Total other comprehensive (loss) income	(1,300)	606	(7,281)	74
Ending Balance	$ (8,035)	$ (1,758)	$ (8,035)	$ (1,758)

Accumulated Other Comprehensi65

Accumulated Other Comprehensive Loss - Summary of Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Gains on sale of investments, net		$ 295	$ 75	$ 295
Income taxes	$ (500)	(448)	(5,122)	(1,051)
Interest expense	(4,156)	(3,248)	(11,676)	(9,341)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Schedule of Available-for-sale Securities [Line Items]
Net of tax	112	185	247	78
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized Gains (Losses) on Securities Available for Sale [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains on sale of investments, net		295	75	295
Income taxes		(100)	(18)	(100)
Net of tax		195	57	195
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Defined Benefit Pension Plan [Member]
Schedule of Available-for-sale Securities [Line Items]
Income taxes		11		67
Net of tax		(12)		(115)
Compensation and employee benefits		(23)		(182)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Derivatives [Member]
Schedule of Available-for-sale Securities [Line Items]
Income taxes	(41)	(1)	(62)	1
Net of tax	112	2	190	(2)
Interest expense	$ 153	$ 3	$ 252	$ (3)

Derivatives And Hedging Activ66

Derivatives And Hedging Activities - Schedule of Fair Value of Derivative Financial Instruments as well as their Classification on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 2,408	$ 1,215
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Other Assets [Member]
Derivatives Fair Value [Line Items]
Fair Values of Derivative Instruments	$ 2,408	$ 1,215

Derivatives and Hedging Activ67

Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)	Jun. 30, 2019USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Interest income	$ 16,718,000	$ 14,408,000	$ 47,941,000	$ 43,437,000
Increase (decrease) in accrued interest payable			259,000	$ 143,000
Net liability position of derivatives	0		0
Debt Instrument, collateral amount	0		0
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Interest income	$ 133,000		$ 232,000
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	4		4
Derivative, notional principal amount	$ 100,000,000		$ 100,000,000

Derivatives And Hedging Activ68

Derivatives And Hedging Activities - Schedule of Pre-Tax Net Gains (Losses) of Cash flow Hedges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 249	$ (231)	$ 1,445	$ 867
Designated as Hedging Instrument [Member] | Cash Flow Hedges of Interest Rate Risk [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	249	(231)	1,445	873
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	153	3	252
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				(3)
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Cash Flow Hedges of Interest Rate Risk [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	249	(231)	1,445	873
Designated as Hedging Instrument [Member] | Interest Rate Products [Member] | Cash Flow Hedges of Interest Rate Risk [Member] | Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 153	$ 3	$ 252
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)				$ (3)

Contingent Liabilities - Additi

Contingent Liabilities - Additional Information (Detail)	9 Months Ended
	Jun. 30, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
Amount the plaintiff seeks from the bank	$ 1,325,000
Estimate of possible loss to the bank	$ 125,000

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		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Provision at statutory rate, Amount	$ 806	$ 751	$ 2,077	$ 2,168
Income from bank-owned life insurance, Amount	(61)	(88)	(183)	(264)
Tax-exempt income, Amount	(112)	(210)	(381)	(642)
Low-income housing credits, Amount	(53)	(25)	(96)	(148)
Tax rate change, Amount	(98)		3,682
Other, net, Amount	18	20	23	(63)
Actual tax expense and effective rate, Amount	$ 500	$ 448	$ 5,122	$ 1,051
Provision at statutory rate, Percentage of pretax income	24.20%	34.00%	24.20%	34.00%
Income from bank-owned life insurance, Percentage of pretax income	(2.20%)	(4.80%)	(3.50%)	(6.30%)
Tax-exempt income, Percentage of pretax income	(4.00%)	(11.40%)	(7.30%)	(15.40%)
Low-income housing credits, Percentage of pretax income	(1.90%)	(1.40%)	(1.80%)	(3.60%)
Tax rate change, Percentage of pretax income	(3.50%)	0.00%	70.20%	0.00%
Other, net, Percentage of pretax income	0.60%	1.00%	0.40%	(1.50%)
Actual tax expense and effective rate, Percentage of pretax income	13.30%	17.50%	82.30%	7.20%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense increased due to Tax Act	$ 3.7
Cumulative losses period included in positive evidence for evaluation of deferred tax assets		3 years