ESSA Bancorp (ESSA) 10-Q 8 Aug 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Jun. 30, 2014	Aug. 01, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Entity Registrant Name	'ESSA Bancorp, Inc.	'
Entity Central Index Key	'0001382230	'
Current Fiscal Year End Date	'--09-30	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	11,758,278

Consolidated_Balance_Sheet

Consolidated Balance Sheet (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Cash and due from banks	$18,600	$22,393
Interest-bearing deposits with other institutions	4,880	4,255
Total cash and cash equivalents	23,480	26,648
Certificates of deposit	1,767	1,767
Investment securities available for sale, at fair value	375,024	315,622
Loans receivable (net of allowance for loan losses of $8,836 and $8,064)	1,050,125	928,230
Regulatory stock, at cost	12,757	9,415
Premises and equipment, net	17,121	15,747
Bank-owned life insurance	29,484	28,797
Foreclosed real estate	2,967	2,111
Intangible assets, net	2,599	2,466
Goodwill	10,259	8,817
Deferred income taxes	10,971	11,183
Other assets	22,624	21,512
TOTAL ASSETS	1,559,178	1,372,315
LIABILITIES	'	'
Deposits	1,143,095	1,041,059
Short-term borrowings	78,749	23,000
Other borrowings	145,550	129,260
Advances by borrowers for taxes and insurance	11,924	4,962
Other liabilities	8,563	7,588
TOTAL LIABILITIES	1,387,881	1,205,869
STOCKHOLDERS' EQUITY	'	'
Preferred Stock ($.01 par value; 10,000,000 shares authorized, none issued)	0	0
Common stock ($.01 par value; 40,000,000 shares authorized, 18,133,095 issued; 11,823,878 and 11,945,564 outstanding at June 30, 2014 and September 30, 2013)	181	181
Additional paid in capital	182,642	182,440
Unallocated common stock held by the Employee Stock Ownership Plan (ESOP)	-10,193	-10,532
Retained earnings	75,781	71,709
Treasury stock, at cost; 6,309,217 and 6,187,531 shares outstanding at June 30, 2014 and September 30, 2013, respectively	-77,445	-76,117
Accumulated other comprehensive income (loss)	331	-1,235
TOTAL STOCKHOLDERS' EQUITY	171,297	166,446
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$1,559,178	$1,372,315

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Allowance for loan losses	$8,836	$8,064
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	11,823,878	11,945,564
Treasury stock, shares outstanding	6,309,217	6,187,531

Consolidated_Statement_of_Inco

Consolidated Statement of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
INTEREST INCOME	'	'	'	'
Loans receivable, including fees	$11,807	$11,032	$32,173	$34,310
Investment securities:	'	'	'	'
Taxable	1,632	1,370	4,682	4,558
Exempt from federal income tax	173	73	318	200
Other investment income	173	16	317	63
Total interest income	13,785	12,491	37,490	39,131
INTEREST EXPENSE	'	'	'	'
Deposits	2,015	1,757	5,909	5,576
Short-term borrowings	54	27	104	109
Other borrowings	619	858	1,951	2,994
Total interest expense	2,688	2,642	7,964	8,679
NET INTEREST INCOME	11,097	9,849	29,526	30,452
Provision for loan losses	500	1,100	2,000	2,950
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	10,597	8,749	27,526	27,502
NONINTEREST INCOME	'	'	'	'
Service fees on deposit accounts	828	797	2,342	2,315
Services charges and fees on loans	283	277	572	774
Trust and investment fees	260	230	701	641
Gain (loss) on sale of investments, net	-10	11	226	749
Gain on sale of loans, net	'	11	'	426
Earnings on Bank-owned life insurance	234	235	687	709
Insurance commissions	205	231	625	638
Gain on acquisition	241	'	241	'
Other	59	8	85	32
Total noninterest income	2,100	1,800	5,479	6,284
NONINTEREST EXPENSE	'	'	'	'
Compensation and employee benefits	4,912	4,690	13,577	14,314
Occupancy and equipment	1,051	956	3,034	2,935
Professional fees	441	549	1,348	1,453
Data processing	977	687	2,426	2,155
Advertising	243	170	463	425
Federal Deposit Insurance Corporation (FDIC) premiums	266	261	730	739
Gain on foreclosed real estate	-65	-100	-116	-498
Merger related costs	176	'	522	'
Amortization of intangible assets	282	250	756	749
Other	812	691	1,987	2,177
Total noninterest expense	9,095	8,154	24,727	24,449
Income before income taxes	3,602	2,395	8,278	9,337
Income taxes	976	519	2,146	2,542
NET INCOME	$2,626	$1,876	$6,132	$6,795
Earnings per share	'	'	'	'
Basic	$0.24	$0.16	$0.56	$0.58
Diluted	$0.24	$0.16	$0.56	$0.58
Dividends per share	$0.07	$0.05	$0.19	$0.15

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$2,626	$1,876	$6,132	$6,795
Investment securities available for sale:	'	'	'	'
Unrealized holding gain (loss)	3,281	-6,354	2,578	-8,229
Tax effect	-1,116	2,160	-877	2,798
Reclassification of (gains) loss recognized in net income	10	-11	-226	-749
Tax effect	-3	4	77	255
Net of tax amount	2,172	-4,201	1,552	-5,925
Pension plan adjustment:	'	'	'	'
Related to actuarial losses and prior service cost	7	98	21	294
Tax effect	-2	-33	-7	-100
Net of tax amount	5	65	14	194
Total other comprehensive income (loss)	2,177	-4,136	1,566	-5,731
Comprehensive income (loss)	$4,803	($2,260)	$7,698	$1,064

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Stockholders' Equity (USD $)	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 Income(Loss) [Member]
In Thousands, except Share data
Beginning Balance at Sep. 30, 2013	$166,446	$181	$182,440	($10,532)	$71,709	($76,117)	($1,235)
Beginning Balance, Shares at Sep. 30, 2013	11,945,564	11,945,564	'	'	'	'	'
Net income	6,132	'	'	'	6,132	'	'
Other comprehensive income	1,566	'	'	'	'	'	1,566
Cash dividends declared ($0.19 per share)	-2,060	'	'	'	-2,060	'	'
Stock based compensation	170	'	170	'	'	'	'
Allocation of ESOP stock	371	'	32	339	'	'	'
Treasury shares purchased	-1,328	'	'	'	'	-1,328	'
Treasury shares purchased, Shares	'	-121,686	'	'	'	'	'
Ending Balance at Jun. 30, 2014	$171,297	$181	$182,642	($10,193)	$75,781	($77,445)	$331
Ending Balance, Shares at Jun. 30, 2014	11,823,878	11,823,878	'	'	'	'	'

Consolidated_Statement_of_Chan1

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Jun. 30, 2014
Cash dividends declared, per share	$0.19
Retained Earnings [Member]	'
Cash dividends declared, per share	$0.19

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES	'	'
Net income	$6,132	$6,795
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Provision for loan losses	2,000	2,950
Provision for depreciation and amortization	948	860
Amortization and accretion of discounts and premiums, net	829	1,205
Net gain on sale of investment securities	-226	-749
Gain on sale of loans, net	'	-426
Origination of mortgage loans sold	'	-19,184
Proceeds from sale of mortgage loans originated for sale	'	19,956
Compensation expense on ESOP	371	361
Stock based compensation	170	1,461
(Increase) decrease in accrued interest receivable	-629	307
Increase (decrease) in accrued interest payable	202	-156
Earnings on bank-owned life insurance	-687	-709
Deferred federal income taxes	-738	1,646
Decrease in prepaid FDIC premiums	'	1,934
(Decrease) increase in accrued pension liability	-412	312
Gain on foreclosed real estate, net	-116	-498
Amortization of identifiable intangible assets	756	749
Other, net	2,113	2,568
Net cash provided by operating activities	10,713	19,383
INVESTING ACTIVITIES	'	'
Purchase of certificates of deposit	'	-500
Investment securities available for sale:	'	'
Proceeds from sale of investment securities	8,065	39,212
Proceeds from principal repayments and maturities	27,863	80,111
Purchases	-37,720	-109,764
Decrease in loans receivable, net	27,025	3,285
Redemption of regulatory stock	2,431	9,556
Purchase of regulatory stock	-4,204	'
Investment in limited partnership	'	-451
Investment in insurance subsidiary	'	-276
Proceeds from sale of foreclosed real estate	2,038	2,841
Acquisition, including cash acquired	-15,415	'
Capital improvements to foreclosed real estate	'	-86
Purchase of premises, equipment, and software	-498	-723
Net cash provided by investing activities	9,585	23,205
FINANCING ACTIVITIES	'	'
(Decrease) increase in deposits, net	-68,902	22,863
Net increase (decrease) in short-term borrowings	55,749	-11,069
Proceeds from other borrowings	42,500	19,800
Repayment of other borrowings	-56,387	-66,100
Increase in advances by borrowers for taxes and insurance	6,962	9,875
Purchase of treasury stock shares	-1,328	-11,430
Dividends on common stock	-2,060	-1,751
Net cash used for financing activities	-23,466	-37,812
Increase in cash and cash equivalents	-3,168	4,776
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	26,648	15,550
CASH AND CASH EQUIVALENTS AT END OF PERIOD	23,480	20,326
Cash Paid:	'	'
Interest	7,762	8,835
Income taxes	2	662
Noncash items:	'	'
Transfers from loans to foreclosed real estate	2,342	952
Treasury stock payable	'	66
Goodwill	'	276
Acquisition:	'	'
Cash received	4,640	'
Noncash assets acquired	'	'
Loans receivable and accrued interest receivable	1,033	'
Premises and equipment	1,626	'
Goodwill	1,442	276
Total noncash assets	4,101	'
Certificates of deposit	-3,069	'
Deposits other than certificates of deposits	5,683	'
Total noncash liabilities	8,752	'
Net noncash assets acquired	-4,651	'
Cash acquired	11	'
Acquisition:	'	'
Cash received	4,640	'
Noncash assets acquired	'	'
Loans receivable and accrued interest receivable	1,033	'
Premises and equipment	1,626	'
Goodwill	1,442	276
Total noncash assets	4,101	'
Certificates of deposit	-3,069	'
Deposits other than certificates of deposits	5,683	'
Total noncash liabilities	8,752	'
Net noncash assets acquired	-4,651	'
Cash acquired	11	'
Franklin Security Bank [Member]	'	'
Noncash assets acquired	'	'
Investment securities, available for sale	55,901	'
Loans receivable	152,188	'
Federal Home Loan Bank stock	1,569	'
Premises and equipment	176	'
Foreclosed real estate	436	'
Intangible assets, net	889	'
Liabilities assumed	-194,628	'
Deferred income taxes	1,031	'
Other assets	2,504	'
Noncash assets acquired	214,694	'
Certificates of deposit	90,869	'
Deposits other than certificates of deposits	71,317	'
Other borrowings	30,177	'
Other liabilities	2,265	'
Net noncash assets acquired	20,066	'
Cash acquired	-19,825	'
Liabilities assumed:	-194,628	'
Noncash assets acquired	'	'
Investment securities, available for sale	55,901	'
Loans receivable	152,188	'
Federal Home Loan Bank stock	1,569	'
Premises and equipment	176	'
Foreclosed real estate	436	'
Intangible assets, net	889	'
Liabilities assumed	-194,628	'
Deferred income taxes	1,031	'
Other assets	2,504	'
Noncash assets acquired	214,694	'
Certificates of deposit	90,869	'
Deposits other than certificates of deposits	71,317	'
Other borrowings	30,177	'
Other liabilities	2,265	'
Net noncash assets acquired	20,066	'
Cash acquired	-19,825	'
Liabilities assumed:	($194,628)	'

Nature_of_Operations_and_Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Jun. 30, 2014
Accounting Policies [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”), and its wholly owned subsidiary, ESSA Bank & Trust (the “Bank”), and the Bank’s wholly owned subsidiaries, ESSACOR, Inc.; Pocono Investments Company; ESSA Advisory Services, LLC; Integrated Financial Corporation; and Integrated Abstract Incorporated, a wholly owned subsidiary of Integrated Financial Corporation. The primary purpose of the Company is to act as a holding company for the Bank. The Company is subject to regulation and supervision as a savings and loan holding company by the Federal Reserve Board. The Bank is a Pennsylvania-chartered savings bank located in Stroudsburg, Pennsylvania. The Bank’s primary business consists of the taking of deposits and granting of loans to customers generally in Monroe, Northampton, Lehigh, Lackawanna and Luzerne counties, Pennsylvania. The Bank is subject to regulation and supervision by the Pennsylvania Banking Department and the Federal Deposit Insurance Corporation. The investment in subsidiary on the parent company’s financial statements is carried at the parent company’s equity in the underlying net assets.
	ESSACOR, Inc. is a Pennsylvania corporation that has been used to purchase properties at tax sales that represent collateral for delinquent loans of the Bank. 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 as a former subsidiary of First Star Bank. The Company acquired First Star Bank in a transaction that closed on July 31, 2012. Integrated Financial Corporation is currently inactive. Integrated Abstract Incorporated is a Pennsylvania Corporation that provides title insurance services. 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 nine month period ended June 30, 2014 are not necessarily indicative of the results that may be expected for the year ending September 30, 2014.

Earnings_per_Share

Earnings per Share	9 Months Ended
	Jun. 30, 2014
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, 2014 and 2013.
			Three months ended						Nine months ended
			June 30,			June 30,			June 30,			June 30,
			2014			2013			2014			2013
	Weighted-average common shares outstanding			18,133,095			18,162,764			18,133,095			18,142,984
	Average treasury stock shares			(6,272,961	)		(5,645,336	)		(6,233,349	)		(5,269,686	)
	Average unearned ESOP shares			(1,012,790	)		(1,058,066	)		(1,024,151	)		(1,069,427	)
	Average unearned non-vested shares			(9,752	)		(49,571	)		(11,233	)		(38,970	)
	Weighted average common shares and common stock equivalents used to calculate basic earnings per share			10,837,592			11,409,791			10,864,362			11,764,901
	Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share			—			—			—			—
	Additional common stock equivalents (stock options) used to calculate diluted earnings per share			—			—			—			—
	Weighted average common shares and common stock equivalents used to calculate diluted earnings per share			10,837,592			11,409,791			10,864,362			11,764,901
	At June 30, 2014 and 2013 there were options to purchase 1,458,379 shares of common stock outstanding at a price of $12.35 per share that were not included in the computation of diluted EPS because to do so would have been anti-dilutive. At June 30, 2014 and 2013 there were 4,440 and 24,999 shares, respectively, of nonvested stock outstanding at prices of $10.94 and $12.35 per share, respectively that were not included in the computation of diluted EPS because to do so would have been anti-dilutive.

Use_of_Estimates_in_the_Prepar

Use of Estimates in the Preparation of Financial Statements	9 Months Ended
	Jun. 30, 2014
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 significantly from those estimates.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Jun. 30, 2014
Accounting Changes And Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	4	Recent Accounting Pronouncements:
	In June 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-08, Financial Services – Investment Companies (Topic 946): Amendments to the Scope, Measurement, and Disclosure Requirements. The amendments in this Update affect the scope, measurement, and disclosure requirements for investment companies under U.S. GAAP. The amendments do all of the following: (1) change the approach to the investment company assessment in Topic 946, clarify the characteristics of an investment company, and provide comprehensive guidance for assessing whether an entity is an investment company; (2) require an investment company to measure noncontrolling ownership interests in other investment companies at fair value rather than using the equity method of accounting; and (3) require the following additional disclosures: (a) the fact that the entity is an investment company and is applying the guidance in Topic 946, (b) information about changes, if any, in an entity’s status as an investment company, and (c) information about financial support provided or contractually required to be provided by an investment company to any of its investees. The amendments in this Update are effective for an entity’s interim and annual reporting periods in fiscal years that begin after December 15, 2013. Earlier application is prohibited. This Update is not expected to have a significant impact on the Company’s financial statements.
	In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This Update applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date. The amendments in this Update are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. This Update is not expected to have a significant impact on the Company’s financial statements.
	In January 2014, the FASB issued ASU 2014-01, Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The amendments in this Update permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments in this Update should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this Update are effective for public business entities for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014. Early adoption is permitted. This Update is not expected to have a significant impact on the Company’s financial statements.
	In January 2014, the FASB issued ASU 2014-04, Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments in this Update clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this Update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt the amendments in this Update using either a modified retrospective transition method or a prospective transition method. This Update is not expected to have a significant impact on the Company’s financial statements.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (a new revenue recognition standard). The Update’s core principle is that a company will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this update specifies the accounting for certain costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. This Update is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. This update is not expected to have a significant impact on the Company’s financial statements.
	In June 2014, the FASB issued ASU 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this Update change the accounting for repurchase-to-maturity transactions to secured borrowing accounting. For repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments also require enhanced disclosures. The accounting changes in this Update are effective for the first interim or annual period beginning after December 15, 2014. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Earlier application is prohibited. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The disclosures are not required to be presented for comparative periods before the effective date. This Update is not expected to have a significant impact on the Company’s financial statements.
	In June 2014, the FASB issued ASU 2014-12, Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could Be Achieved After the Requisite Service Period. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The amendments in this Update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Earlier adoption is permitted. Entities may apply the amendments in this Update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. If retrospective transition is adopted, the cumulative effect of applying this Update as of the beginning of the earliest annual period presented in the financial statements should be recognized as an adjustment to the opening retained earnings balance at that date. Additionally, if retrospective transition is adopted, an entity may use hindsight in measuring and recognizing the compensation cost. This Update is not expected to have a significant impact on the Company’s financial statements.

Investment_Securities

Investment Securities	9 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Investment Securities	'
	5	Investment Securities
	The amortized cost and fair value of investment securities available for sale are summarized as follows (in thousands):
			June 30, 2014
			Amortized		Gross		Gross			Fair Value
			Cost		Unrealized		Unrealized
					Gains		Losses
	Available for Sale
	Fannie Mae		$	141,678	$	1,991	$	(1,230	)	$	142,439
	Freddie Mac			80,805		813		(1,017	)		80,601
	Governmental National Mortgage Association			31,709		170		(170	)		31,709
	Other mortgage-backed securities			2,839		—		(7	)		2,832
	Total mortgage-backed securities			257,031		2,974		(2,424	)		257,581
	Obligations of states and political subdivisions			42,067		1,390		(294	)		43,163
	U.S. government agency securities			48,037		240		(372	)		47,905
	Corporate obligations			13,169		262		(26	)		13,405
	Trust-preferred securities			5,003		688		—			5,691
	Other debt securities			5,233		40		(19	)		5,254
	Total debt securities			370,540		5,594		(3,135	)		372,999
	Equity securities - financial services			2,025		—		—			2,025
	Total		$	372,565	$	5,594	$	(3,135	)	$	375,024
			September 30, 2013
			Amortized		Gross		Gross			Fair Value
			Cost		Unrealized		Unrealized
					Gains		Losses
	Available for Sale
	Fannie Mae		$	114,927	$	1,691	$	(1,595	)	$	115,023
	Freddie Mac			60,111		838		(1,252	)		59,697
	Governmental National Mortgage Association			39,692		289		(230	)		39,751
	Other mortgage-backed securities			3,385		—		(19	)		3,366
	Total mortgage-backed securities			218,115		2,818		(3,096	)		217,837
	Obligations of states and political subdivisions			23,754		654		(499	)		23,909
	U.S. government agency securities			52,775		225		(480	)		52,520
	Corporate obligations			12,756		186		(169	)		12,773
	Trust-preferred securities			4,943		471		—			5,414
	Other debt securities			1,147		7		—			1,154
	Total debt securities			313,490		4,361		(4,244	)		313,607
	Equity securities - financial services			2,025		—		(10	)		2,015
	Total		$	315,515	$	4,361	$	(4,254	)	$	315,622
	The amortized cost and fair value of debt securities at June 30, 2014, 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		Fair Value
			Cost
	Due in one year or less		$	2,130	$	2,144
	Due after one year through five years			47,511		47,901
	Due after five years through ten years			63,011		63,750
	Due after ten years			257,888		259,204
	Total		$	370,540	$	372,999
	For the three months ended June 30, 2014, the Company realized gross losses of $10,000 on proceeds from the sale of investment securities of $100. For the nine months ended June 30, 2014, the Company realized gross gains of $247,000 and gross losses of $21,000 on proceeds from the sale of investment securities of $8.1 million. For the three months ended June 30, 2013, the Company realized gross gains of $11,000 on proceeds from the sale of investment securities of $23,000. For the nine months ended June 30, 2013, the Company realized gross gains of $767,000 and gross losses of $18,000 on proceeds from the sale of investment securities of $39.2 million.

Unrealized_Losses_on_Securitie

Unrealized Losses on Securities	9 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Unrealized Losses on Securities	'
	6	Unrealized Losses on Securities
	The following table shows the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands):
			June 30, 2014
			Number of		Less than Twelve					Twelve Months or					Total
			Securities		Months					Greater
					Fair		Gross			Fair		Gross			Fair		Gross
					Value		Unrealized			Value		Unrealized			Value		Unrealized
							Losses					Losses					Losses
	Fannie Mae			24	$	6,381	$	(28	)	$	33,971	$	(1,202	)	$	40,352	$	(1,230	)
	Freddie Mac			23		9,551		(49	)		30,409		(968	)		39,960		(1,017	)
	Governmental National Mortgage Association			6		3,453		(11	)		6,245		(159	)		9,698		(170	)
	Other mortgage-backed securities			3		547		(1	)		2,286		(6	)		2,833		(7	)
	Obligations of states and political subdivisions			5		—		—			7,186		(294	)		7,186		(294	)
	U.S. government agency securities			10		4,004		(6	)		23,470		(366	)		27,474		(372	)
	Corporate obligations			5		1,990		(10	)		2,319		(16	)		4,309		(26	)
	Other debt securities			2		2,102		(19	)		—		—			2,102		(19	)
	Total			78	$	28,028	$	(124	)	$	105,886	$	(3,011	)	$	133,914	$	(3,135	)
	September 30, 2013
			Number of		Less than Twelve					Twelve Months or					Total
			Securities		Months					Greater
					Fair		Gross			Fair		Gross			Fair		Gross
					Value		Unrealized			Value		Unrealized			Value		Unrealized
							Losses					Losses					Losses
	Fannie Mae			30	$	47,814	$	(1,589	)	$	1,057	$	(6	)	$	48,871	$	(1,595	)
	Freddie Mac			20		32,781		(1,252	)				—			32,781		(1,252	)
	Governmental National Mortgage Association			6		10,301		(230	)		—		—			10,301		(230	)
	Other mortgage-backed securities			3		3,366		(19	)		—		—			3,366		(19	)
	Obligations of states and political subdivisions			7		8,064		(499	)		—		—			8,064		(499	)
	U.S. government agency securities			10		30,084		(479	)		999		(1	)		31,083		(480	)
	Corporate obligations			5		5,042		(169	)		—		—			5,042		(169	)
	Equity securities-financial services			1		1,990		(10	)		—		—			1,990		(10	)
	Total			82	$	139,442	$	(4,247	)	$	2,056	$	(7	)	$	141,498	$	(4,254	)
	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, debt obligations of a U.S. state or political subdivision and corporate debt obligations.
	The Company reviews its position quarterly and has asserted that at June 30, 2014, the declines outlined in the above table represent temporary declines and the Company would not be required to sell the security before its anticipated recovery in market value.
	The Company has concluded that any impairment of its investment securities portfolio 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, 2014
Receivables [Abstract]	'
Loans Receivable, Net and Allowance for Loan Losses	'
	7	Loans Receivable, Net and Allowance for Loan Losses
	Loans receivable consist of the following (in thousands):
			June 30,			September 30,
			2014			2013
	Held for investment:
	Real Estate Loans:
	Residential		$	667,316		$	686,651
	Construction			1,800			2,288
	Commercial			188,343			159,469
	Commercial			23,331			10,125
	Obligations of states and political subdivisions			50,096			33,445
	Home equity loans and lines of credit			40,866			41,923
	Auto Loans			83,619			61
	Other			3,590			2,332
				1,058,961			936,294
	Less allowance for loan losses			8,836			8,064
	Net loans		$	1,050,125		$	928,230
	Included in the June 30, 2014 balances are loans acquired from FNCB, as of the acquisition date of January 24,2014 as follows:
	Real Estate Loans:
	Residential		$	933
	Home equity loans and lines of credit			77
	Other			20
	Total loans		$	1,030
	Included in the June 30, 2014 balances are loans acquired from Franklin Security Bank, as of the acquisition date of April 4, 2014 as follows:
	Real Estate Loans:
	Residential		$	17,151
	Commercial			38,247
	Commercial			9,308
	Obligations of states and political subdivisions			7,309
	Home equity loans and lines of credit			16
	Auto loans			78,794
	Other			1,363
	Total loans		$	152,188
			Total Loans			Individually Evaluated for			Loans Acquired with			Collectively Evaluated
						Impairment			Deteriorated Credit Quality			for Impairment
	June 30, 2014
	Real Estate Loans:
	Residential		$	667,316		$	13,093		$	109		$	654,114
	Construction			1,800			—			—			1,800
	Commercial			188,343			17,912			5,151			165,280
	Commercial			23,331			536			293			22,502
	Obligations of states and political subdivisions			50,096			—			—			50,096
	Home Equity loans and lines of credit			40,866			220			—			40,646
	Auto Loans			83,619			—			—			83,619
	Other			3,590			—			—			3,590
	Total		$	1,058,961		$	31,761		$	5,553		$	1,021,647
			Total Loans			Individually Evaluated for			Loans Acquired with			Collectively Evaluated
						Impairment			Deteriorated Credit Quality			for Impairment
	September 30, 2013
	Real Estate Loans:
	Residential		$	686,651		$	14,018		$	271		$	672,362
	Construction			2,288			—			—			2,288
	Commercial			159,469			15,478			6,355			137,636
	Commercial			10,125			220			502			9,403
	Obligations of states and political subdivisions			33,445			—			—			33,445
	Home Equity loans and lines of credit			41,923			379			3			41,541
	Auto Loans			61			—			—			61
	Other			2,332			—			—			2,332
	Total		$	936,294		$	30,095		$	7,131		$	899,068
	We maintain 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. We do 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 because of the borrower’s financial condition that it would not otherwise consider. Such concessions include the reduction of interest rates, forgiveness of principal or interest, or other modifications of interest rates that are less than the current market rate for new obligations with similar risk. TDR loans that are in compliance with their modified terms and that yield a market rate may be removed from the TDR status after a period of performance.
	The following table includes the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable. Also presented are the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired.
		Recorded			Unpaid			Associated			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
June 30, 2014
With no specific allowance recorded:
Real Estate Loans
Residential		$	8,512		$	10,603		$	—		$	9,566		$	242
Construction			—			—			—			—			—
Commercial			22,252			23,205			—			20,241			553
Commercial			829			834			—			1,764			49
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			183			458			—			285			4
Auto Loans			—			—			—			—			—
Other			—			—			—			—			—
Total			31,776			35,100			—			31,856			848
With an allowance recorded:
Real Estate Loans
Residential			4,690			5,258			531			3,425			79
Construction			—			—			—			—			—
Commercial			811			847			96			1,896			—
Commercial			—			—			—			—			—
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			37			45			37			17			—
Auto Loans			—			—			—			—			—
Other			—			—			—			—			—
Total			5,538			6,150			664			5,338			79
Total:
Real Estate Loans
Residential			13,202			15,861			531			12,991			321
Construction			—			—			—			—			—
Commercial			23,063			24,052			96			22,137			553
Commercial			829			834			—			1,764			49
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			220			503			37			302			4
Auto Loans			—			—						—			—
Other			—			—			—			—			—
Total Impaired Loans		$	37,314		$	41,250		$	664		$	37,194		$	927
		Recorded			Unpaid			Associated			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
September 30, 2013
With no specific allowance recorded:
Real Estate Loans
Residential		$	11,251		$	13,013		$	—		$	9,716		$	159
Construction			—			—			—			—			—
Commercial			18,711			20,258			—			20,751			615
Commercial			722			731			—			1,034			9
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			382			683			—			373			3
Other			—			—			—			18			—
Total			31,066			34,685			—			31,892			786
With an allowance recorded:
Real Estate Loans
Residential			3,038			3,221			518			2,655			74
Construction			—			—			—			—			—
Commercial			3,122			3,178			301			2,839
Commercial			—			—			—			—			—
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			—			—			—			—
Other			—			—			—			—			—
Total			6,160			6,399			819			5,494			74
Total:
Real Estate Loans
Residential			14,289			16,234			518			12,371			233
Construction			—			—			—			—			—
Commercial			21,833			23,436			301			23,590			615
Commercial			722			731			—			1,034			9
Obligations of states and political subdivisions			—			—			—			—			—
Home equity loans and lines of credit			382			683			—			373			3
Other			—			—			—			18			—
Total Impaired Loans		$	37,226		$	41,084		$	819		$	37,386		$	860
Management 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 currently protected but are potentially weak, resulting in an undue and unwarranted credit risk, but not to the point of justifying a Substandard classification. Loans in the Substandard category have well-defined weaknesses that jeopardize the liquidation of the debt, and have a distinct possibility that some loss will be sustained if the weaknesses are not corrected. All loans greater than 90 days past due are considered Substandard. The portion of any loan that represents a specific allocation of the allowance for loan losses is placed in the Doubtful category. Any portion of a loan that has been charged off is placed in the Loss category.
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 of 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 $250,000 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 $500,000 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 within the internal risk rating system as of June 30, 2014 and September 30, 2013 (in thousands):
		Pass			Special			Substandard			Doubtful			Total
					Mention
June 30, 2014
Commercial real estate loans		$	157,359		$	8,576		$	22,106		$	302		$	188,343
Commercial			22,295			375			661			—			23,331
Obligations of states and political subdivisions			50,096			—			—			—			50,096
Total		$	229,750		$	8,951		$	22,767		$	302		$	261,770
		Pass			Special			Substandard			Doubtful			Total
					Mention
September 30, 2013
Commercial real estate loans		$	129,799		$	9,440		$	20,230		$	—		$	159,469
Commercial			9,466			436			223			—			10,125
Obligations of states and political subdivisions			33,445			—			—			—			33,445
Total		$	172,710		$	9,876		$	20,453		$	—		$	203,039
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, 2014 and September 30, 2013 (in thousands):
		Performing			Non-performing			Total
June 30, 2014
Real estate loans:
Residential		$	656,893		$	10,423		$	667,316
Construction			1,800			—			1,800
Home Equity loans and lines of credit			40,613			253			40,866
Auto Loans			83,594			25			83,619
Other			3,577			13			3,590
Total		$	786,477		$	10,714		$	797,191
		Performing			Non-performing			Total
September 30, 2013
Real estate loans:
Residential		$	675,706		$	10,945		$	686,651
Construction			2,288			—			2,288
Home Equity loans and lines of credit			41,584			339			41,923
Auto loans			61			—			61
Other			2,332			—			2,332
Total		$	721,971		$	11,284		$	733,255
Management further monitors the performance and credit quality of the loan portfolio by analyzing the age of the portfolio as determined by the length of time a recorded payment is 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, 2014 and September 30, 2013 (in thousands):
		Current			31-60 Days			61-90 Days			Greater than			Non-Accrual			Total Past			Total
					Past Due			Past Due			90 Days Past						Due and			Loans
											Due and still						Non-
											accruing						Accrual
June 30, 2014
Real estate loans
Residential		$	652,247		$	3,857		$	789		$	—		$	10,423		$	15,069		$	667,316
Construction			1,800			—			—			—			—			—			1,800
Commercial			177,162			283			—			—			10,898			11,181			188,343
Commercial			21,682			204			127			—			1,318			1,649			23,331
Obligations of states and political subdivisions			50,077			19			—			—			—			19			50,096
Home equity loans and lines of credit			40,514			69			30			—			253			352			40,866
Auto Loans			83,312			282			—			—			25			307			83,619
Other			3,517			51			9			—			13			73			3,590
Total		$	1,030,311		$	4,765		$	955		$	—		$	22,930		$	28,650		$	1,058,961
		Current			31-60 Days			61-90 Days			Greater than			Non-Accrual			Total Past			Total
					Past Due			Past Due			90 Days Past						Due and			Loans
											Due and still						Non-
											accruing						Accrual
September 30, 2013
Real estate loans
Residential		$	671,850		$	2,866		$	990		$	—		$	10,945		$	14,801		$	686,651
Construction			2,288			—			—			—			—			—			2,288
Commercial			146,062			2,589						—			10,818			13,407			159,469
Commercial			8,948			—			—			—			1,177			1,177			10,125
Obligations of states and political subdivisions			33,445			—			—			—			—			—			33,445
Home equity loans and lines of credit			41,380			127			77			—			339			543			41,923
Auto loans			61			—			—			—			—			—			61
Other			2,275			57			—			—			—			57			2,332
Total		$	906,309		$	5,639		$	1,067		$	—		$	23,279		$	29,985		$	936,294
Our 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. Our 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, 2014 is maintained at a level that represents management’s best estimate of losses inherent in the loan portfolio, and such losses were both probable and reasonably estimable.
In addition, the FDIC and the Pennsylvania Department of Banking, as an integral part of their examination process, have periodically reviewed 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 ALL. When information confirms all or part of specific loans to be uncollectible, these amounts are promptly charged off against the ALL.
The following tables summarize changes in the primary segments of the ALL for the three and nine month periods ending June 30, 2014 and 2013:
		Real Estate Loans
		Residential			Construction			Commercial			Commercial			Obligations of			Home			Auto		Other Loans			Unallocated		Total
											Loans			States and			Equity			Loans
														Political			Loans and
														Subdivisions			Lines of
																	Credit
ALL balance at March 31, 2014			5,920			26			1,003			369			106			500			—		26			712		8,662
Charge-offs			(332	)		—			(23	)		—			—			(10	)		—		—			—		(365	)
Recoveries			34			—			—			2			—			—			—		3			—		39
Provision			312			(2	)		(399	)		222			10			(17	)		56		(3	)		321		500
ALL balance at June 30, 2014			5,934			24			581			593			116			473			56		26			1,033		8,836
March 31, 2013			5,791			28			837			350			106			496			—		19			44		7,671
Charge-offs			(509	)		—			(74	)		(16	)		—			—			—		—			—		(599	)
Recoveries			9			—			—			—			—			3			—		—			—		12
Provision			676			16			262			27			7			97			—		1			14		1,100
ALL balance at June 30, 2013			5,967			44			1,025			361			113			596			—		20			58		8,184
ALL balance at September 30, 2013			5,787			20			946			337			130			430			—		21			393		8,064
Charge-offs			(1,255	)		—			(73	)		(48	)		—			(73	)		—		—			—		(1,449	)
Recoveries			112			—			83			14			—			—			—		12			—		221
Provision			1,290			4			(375	)		290			(14	)		116			56		(7	)		640		2,000
ALL balance at June 30, 2014			5,934			24			581			593			116			473			56		26			1,033		8,836
September 30, 2012			5,401			29			699			474			127			499			—		22			51		7,302
Charge-offs			(1,752	)		—			(288	)		(16	)		—			(67	)		—		(6	)		—		(2,129	)
Recoveries			50			—			2			—			—			9			—		—			—		61
Provision			2,268			15			612			(97	)		(14	)		155			—		4			7		2,950
ALL balance at June 30, 2013			5,967			44			1,025			361			113			596			—		20			58		8,184
Acquired loans are recorded at fair value on their purchase date without a carryover of the related allowance for loan losses.
The following table summarizes the primary segments of the ALL, segregated into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2014 (in thousands):
		Real Estate Loans
		Residential			Construction			Commercial			Commercial			Obligations of			Home			Auto		Other Loans			Unallocated		Total
											Loans			States and			Equity			Loans
														Political			Loans and
														Subdivisions			Lines of
																	Credit
Individually evaluated for impairment			531			—			96			—			—			37			—		—			—		664
Collectively evaluated for impairment			5,403			24			485			593			116			436			56		26			1,033		8,172
ALL Balance at June 30, 2014			5,934			24			581			593			116			473			56		26			1,033		8,836
Individually evaluated for impairment			518			—			301			—			—			—			—		—			—		819
Collectively evaluated for impairment			5,269			20			645			337			130			430			—		21			393		7,245
ALL balance at September 30, 2013			5,787			20			946			337			130			430			—		21			393		8,064
The allowance for loan losses is based on estimates, and actual losses will vary from current estimates. Management believes that the granularity of the homogeneous pools and the related historical loss ratios and other qualitative factors, as well as the consistency in the application of assumptions, result in an ALL that is representative of the risk found in the components of the portfolio at any given date. The Company allocated increased provisions to the residential real estate, commercial loans, home equity loans and lines of credit segments for the nine month period ending June 30, 2014 due to increased charge off activity and impairment evaluations in those segments. 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, 2014 and 2013.
		For the Three Months Ended June 30, 2014
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled Debt Restructurings
Real estate loans:
Residential			2		$	236		$	236
Construction			—			—			—
Commercial			—			—			—
Commercial			—			—			—
Obligations of states and political subdivisions			—			—			—
Home equity loans and lines of credit			—			—			—
Auto Loans			—			—			—
Other			—			—			—
Total			2		$	236		$	236
Of the two new troubled debt restructurings granted for the three months ended June 30, 2014, one loan totaling $208,000 was granted terms and rate concessions and one loan totaling $28,000 was granted terms concessions.
		For the Three Months Ended June 30, 2013
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled Debt Restructurings
Real estate loans:
Residential			8		$	989		$	989
Construction			—			—			—
Commercial			—			—			—
Commercial			—			—			—
Obligations of states and political subdivisions			—			—			—
Home equity loans and lines of credit			1			98			98
Auto Loans			—			—			—
Other			—			—			—
Total			9		$	1,087		$	1,087
Of the nine new troubled debt restructurings granted for the three months ended June 30, 2013, six loans totaling $751,000 were granted terms and rate concessions and three loans totaling $336,000 were granted terms concessions.
		For the Nine Months Ended June 30, 2014
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled Debt Restructurings
Real estate loans:
Residential			9		$	1,293		$	1,293
Construction			—			—			—
Commercial			1			197			197
Commercial			—			—			—
Obligations of states and political subdivisions			—			—			—
Home equity loans and lines of credit			—			—			—
Auto Loans			—			—			—
Other			—			—			—
Total			10		$	1,490		$	1,490
Of the ten new troubled debt restructurings granted for the nine months ended June 30, 2014, six loans totaling $883,000 were granted terms and rate concessions and four loans totaling $607,000 were granted terms concessions.
		For the Nine Months Ended June 30, 2013
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
Troubled Debt Restructurings
Real estate loans:
Residential			12		$	1,589		$	1,589
Construction			—			—			—
Commercial			—			—			—
Commercial			—			—			—
Obligations of states and political subdivisions			—			—			—
Home equity loans and lines of credit			1			98			98
Auto Loans
Other			—			—			—
Total			13		$	1,687		$	1,687
Of the 13 new troubled debt restructurings granted for the nine months ended June 30, 2013, eight loans totaling $1.3 million were granted terms and rate concessions and five loans totaling $410,000 were granted terms concessions. There were no troubled debt restructurings that have subsequently defaulted within one year of modification for the three and nine months ended June 30, 2014 and 2013.

Deposits

Deposits	9 Months Ended
	Jun. 30, 2014
Banking And Thrift [Abstract]	'
Deposits	'
	8	Deposits
	Deposits consist of the following major classifications (in thousands):
			June 30,		September 30,
			2014		2013
	Non-interest bearing demand accounts		$	70,980	$	58,795
	NOW accounts			120,939		99,857
	Money market accounts			178,263		138,049
	Savings and club accounts			124,812		110,189
	Certificates of deposit			648,101		634,169
	Total		$	1,143,095	$	1,041,059

Net_Periodic_Benefit_CostDefin

Net Periodic Benefit Cost-Defined Benefit Plan	9 Months Ended
	Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]	'
Net Periodic Benefit Cost-Defined Benefit Plan	'
	9	Net Periodic Benefit Cost-Defined Benefit Plan
	For a detailed disclosure on the Bank’s pension and employee benefits plans, please refer to Note 13 of the Company’s Consolidated Financial Statements for the year ended September 30, 2013 included in the Company’s Form 10-K.
	The following table comprises the components of net periodic benefit cost for the periods ended (in thousands):
			Three Months Ended						Nine Months Ended
			June 30,						June 30,
			2014			2013			2014			2013
	Service Cost		$	144		$	175		$	433		$	526
	Interest Cost			191			179			572			537
	Expected return on plan assets			(290	)		(259	)		(871	)		(776	)
	Amortization of unrecognized loss			7			98			21			294
	Net periodic benefit cost		$	52		$	193		$	155		$	581
	The Bank contributed $550,000 to its pension plan in May 2014.

Equity_Incentive_Plan

Equity Incentive Plan	9 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Equity Incentive Plan	'
	10	Equity Incentive Plan
	The Company maintains the ESSA Bancorp, Inc. 2007 Equity Incentive Plan (the “Plan”). The Plan provides for a total of 2,377,326 shares of common stock for issuance upon the grant or exercise of awards. Of the shares available under the Plan, 1,698,090 may be issued in connection with the exercise of stock options and 679,236 may be issued as restricted stock. The Plan allows for the granting of non-qualified stock options (“NSOs”), incentive stock options (“ISOs”), and restricted stock. Options are granted at no less than the fair value of the Company’s common stock on the date of the grant.
	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. 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. Additionally, generally accepted accounting principles require the Company to report: (1) the expense associated with the grants as an adjustment to operating cash flows and (2) any benefits of realized tax deductions in excess of previously recognized tax benefits on compensation expense as a financing cash flow.
	Stock options vest over a five-year service period and expire ten years after grant date. The Company recognizes compensation expense for the fair values of these awards, which vest on a straight-line basis over the requisite service period of the awards.
	The 2008 restricted shares vest over a five-year service period. The 2013 restricted stock shares vest over an 18-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. The Company recognizes compensation expense for the fair value of restricted shares on a straight-line basis over the requisite service period for the entire award.
	For the nine months ended June 30, 2014 and 2013, the Company recorded $170,000 and $1.5 million of share-based compensation expense, respectively, comprised of restricted stock expense of $170,000 for the June 30, 2014 period and stock option expense of $458,000 and restricted stock expense of $1.0 million for the June 30, 2013 period. Expected future compensation expense relating to the 13,334 restricted shares at June 30, 2014, is $49,000 over the remaining vesting period of 0.25 years.
	The following is a summary of the Company’s stock option activity and related information for its option grants for the six month period ended June 30, 2014.
			Number of Stock		Weighted-		Weighted-		Aggregate
			Options		average		average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual		(in thousands)
							Term (in years)
	Outstanding, September 30, 2013			1,458,379	$	12.35		4.67	$	—
	Granted			—		—		—		—
	Exercised			—		—		—		—
	Forfeited			—		—		—		—
	Outstanding, June 30, 2014			1,458,379	$	12.35		3.9	$	—
	Exercisable at June 30, 2014			1,458,379	$	12.35		3.9	$	—
	The following is a summary of the status of the Company’s restricted stock as of June 30, 2014, and changes therein during the six month period then ended:
			Number of		Weighted-
			Restricted Stock		average
					Grant Date
					Fair Value
	Nonvested at September 30, 2013			14,995	$	10.94
	Granted			—		—
	Vested			1,661		10.94
	Forfeited			—		—
	Nonvested at June 30, 2014			13,334	$	10.94

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	11	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 table presents information about the Company’s securities, other real estate owned and impaired loans measured at fair value as of June 30, 2014 and September 30, 2013 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, 2014
	Fair Value Measurements Utilized for the		Quoted Prices in Active		Significant Other			Significant		Balances as of
	Company’s Financial Assets (in thousands):		Markets for Identical Assets		Observable Inputs			Unobservable Inputs		September 30, 2013
			(Level 1)		(Level 2)			(Level 3)
	Securities available-for-sale measured on a recurring basis
	Mortgage backed securities		$	—	$	257,581		$	—	$	257,581
	Obligations of states and political subdivisions			—		43,163			—		43,163
	U.S. government agencies			—		47,905			—		47,905
	Corporate obligations			—		13,405			—		13,405
	Trust-preferred securities			—		3,861			1,830		5,691
	Other debt securities			—		5,254			—		5,254
	Equity securities-financial services			2,025		—			—		2,025
	Total debt and equity securities		$	2,025	$	371,169		$	1,830	$	375,024
	Foreclosed real estate owned measured on a non-recurring basis		$	—	$	—		$	2,967	$	2,967
	Impaired loans measured on a non-recurring basis		$	—	$	—		$	36,650	$	36,650
			Fair Value Measurement at September 30, 2013
	Fair Value Measurements Utilized for the		Quoted Prices in Active		Significant Other			Significant		Balances as of
	Company’s Financial Assets (in thousands):		Markets for Identical Assets		Observable Inputs			Unobservable Inputs		September 30, 2013
			(Level 1)		(Level 2)			(Level 3)
	Securities available-for-sale measured on a recurring basis
	Mortgage backed securities		$	—	$	217,837		$	—	$	217,837
	Obligations of states and political subdivisions			—		23,909			—		23,909
	U.S. government agencies			—		52,520			—		52,520
	Corporate obligations			—		12,773			—		12,773
	Trust-preferred securities			—		3,614			1,800		5,414
	Other debt securities			—		1,154			—		1,154
	Equity securities-financial services			2,015		—			—		2,015
	Total debt and equity securities		$	2,015	$	311,807		$	1,800	$	315,622
	Foreclosed real estate owned measured on a non-recurring basis		$	—	$	—		$	2,111	$	2,111
	Impaired loans measured on a non-recurring basis		$	—	$	—		$	36,407	$	36,407
	The following table presents a summary of changes in the fair value of the Company’s Level III investments for the periods ended June 30, 2014 and June 30, 2013.
			Fair Value Measurement Using Significant Unobservable Inputs
			(Level III)
			Three months ended
			June 30, 2014		June 30, 2013
	Beginning balance		$	1,830	$	1,760
	Purchases, sales, issuances, settlements, net			—		—
	Total unrealized gain:
	Included in earnings			—
	Included in other comprehensive income			—		20
	Transfers in and/or out of Level III			—		—
			$	1,830	$	1,780
			Fair Value Measurement Using Significant Unobservable Inputs
			(Level III)
			Nine months ended
			June 30, 2014		June 30, 2013
	Beginning balance		$	1,800	$	1,740
	Purchases, sales, issuances, settlements, net			—		—
	Total unrealized gain:
	Included in earnings			—		—
	Included in other comprehensive income			30		40
	Transfers in and/or out of Level III			—		—
			$	1,830	$	1,780
	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 Bank 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. 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, 2014, 249 impaired loans with a carrying value of $37.3 million were reduced by specific valuation allowance totaling $664,000 resulting in a net fair value of $36.7 million based on Level 3 inputs. At September 30, 2013, 233 impaired loans with a carrying value of $37.2 million were reduced by a specific valuation totaling $819,000 resulting in a net fair value of $36.4 million based on Level 3 inputs.
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	(unaudited, in thousands)		Fair Value		Valuation		Unobservable	Range
			Estimate		Techniques		Input
	June 30, 2014:
Impaired loans			36,650	Appraisal of		Appraisal	0% to 30%
				collateral (1)		adjustments (2)	-23.00%
Foreclosed real estate owned			2,967	Appraisal of		Appraisal	20% to 40%
				collateral (1), (3)		adjustments (2)	-21.40%
		Quantitative Information about Level 3 Fair Value Measurements
(unaudited, in thousands)		Fair Value		Valuation		Unobservable	Range
		Estimate		Techniques		Input
September 30, 2013:
Impaired loans			36,407	Appraisal of		Appraisal	0% to 30%
				collateral (1)		adjustments (2)	-23.50%
Foreclosed real estate owned			2,111	Appraisal of		Appraisal	0% to 30%
				collateral (1), (3)		adjustments (2)	-20.40%
-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.
-3	Includes qualitative adjustments by management and estimated liquidation expenses.
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.
		June 30, 2014
		Carrying Value		Level I			Level II		Level III		Total Fair
											Value
Financial assets:
Cash and cash equivalents		$	23,480	$	23,480		$	—	$	—	$	23,480
Certificates of deposit			1,767		—			1,767		—		1,767
Investment and mortgage backed securities available for sale			375,024		2,025			371,169		1,830		375,024
Loans receivable, net			1,050,125		—			—		1,078,683		1,078,683
Accrued interest receivable			5,042		5,042			—		—		5,042
FHLB stock			12,757		12,757			—		—		12,757
Mortgage servicing rights			799		—			—		799		799
Bank owned life insurance			29,484		29,484			—		—		29,484
Financial liabilities:
Deposits		$	1,143,095	$	494,994		$	—	$	651,908		1,146,902
Short-term borrowings			78,749		78,749			—		—		78,749
Other borrowings			145,260		—			—		146,398		146,398
Advances by borrowers for taxes and insurance			11,924		11,924			—		—		11,924
Accrued interest payable			1,035		1,035			—		—		1,035
		September 30, 2013
		Carrying Value		Level I			Level II		Level III		Total Fair
											Value
Financial assets:
Cash and cash equivalents		$	26,648	$	26,648		$	—	$	—	$	26,648
Certificates of deposit			1,767		—			1,767		—		1,767
Investment and mortgage backed securities available for sale			315,622		2,015			311,807		1,800		315,622
Loans receivable, net			928,230		—			—		951,120		951,120
Accrued interest receivable			4,413		4,413			—		—		4,413
FHLB stock			9,415		9,415			—		—		9,415
Mortgage servicing rights			382		—			—		382		382
Bank owned life insurance			28,797		28,797			—		—		28,797
Financial liabilities:
Deposits		$	1,041,059	$	406,890		$	—	$	638,510		1,045,400
Short-term borrowings			23,000		23,000			—		—		23,000
Other borrowings			129,260		—			—		124,504		124,504
Advances by borrowers for taxes and insurance			4,962		4,962			—		—		4,962
Accrued interest payable			833		833			—		—		833
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 FHLB 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 FHLB stock is not actively traded on a secondary market and held exclusively by member financial institutions, the fair market value approximates the carrying amount.
Loans Receivable
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.
Deposit Liabilities
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_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Income	'
	12	Accumulated Other Comprehensive Income
	The activity in accumulated other comprehensive income for the three and nine months ended June 30, 2014 and 2013 is as follows:
			Accumulated Other
			Comprehensive Income/(Loss)
			Defined Benefit			Unrealized Gains			Total
			Pension Plan			(Losses) on Securities
						Available for Sale
	Balance at March 31, 2014		$	(1,297	)	$	(549	)	$	(1,846	)
	Other comprehensive income before reclassifications			—			2,165			2,165
	Amounts reclassified from accumulated other comprehensive income			5			7			12
	Period change			5			2,172			2,177
	Balance at June 30, 2014		$	(1,292	)	$	1,623		$	331
	Balance at March 31, 2013		$	(4,318	)	$	4,481		$	163
	Other comprehensive loss before reclassifications			—			(4,194	)		(4,194	)
	Amounts reclassified from accumulated other comprehensive income			65			(7	)		58
	Period change			65			(4,201	)		(4,136	)
	Balance at June 30, 2013		$	(4,253	)	$	280		$	(3,973	)
			Accumulated Other
			Comprehensive Income/(Loss)
			Defined Benefit			Unrealized Gains			Total
			Pension Plan			(Losses) on Securities
						Available for Sale
	Balance at September 30, 2013		$	(1,306	)	$	71		$	(1,235	)
	Other comprehensive income before reclassifications			—			1,701			1,701
	Amounts reclassified from accumulated other comprehensive income			14			(149	)		(135	)
	Period change			14			1,552			1,566
	Balance at June 30, 2014		$	(1,292	)	$	1,623		$	331
	Balance at September 30, 2012		$	(4,450	)	$	6,208		$	1,758
	Other comprehensive loss before reclassifications			—			(5,431	)		(5,431	)
	Amounts reclassified from accumulated other comprehensive income			194			(494	)		(300	)
	Period change			194			(5,925	)		(5,731	)
	Balance at June 30, 2013		$	(4,256	)	$	283		$	(3,973	)
			Amount Reclassified from
			Accumulated Other Comprehensive Income
			Accumulated Other						Affected Line Item in the Consolidated
			Comprehensive Income for						Statement of Income
			the Three Months Ended
			June 30,
			2014			2013
	Securities available for sale:
	Net securities gains reclassified into earnings		$	10		$	(11	)	Gain on sale of investments, net
	Related income tax expense			(3	)		4		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			7			(7	)	Net of tax
	Defined benefit pension plan:
	Amortization of net loss and prior service costs			7			98		Compensation and employee benefits
	Related income tax expense		$	(2	)	$	(33	)	Provision for income taxes
	Net effect on accumulated other			5			65		Net of tax
	Total reclassification for the period		$	12		$	58		Net of tax
			Amount Reclassified from
			Accumulated Other Comprehensive Income
			Accumulated Other						Affected Line Item in the Consolidated
			Comprehensive Income for						Statement of Income
			the Nine months Ended
			June 30,
			2014			2013
	Securities available for sale:
	Net securities gains reclassified into earnings		$	(226	)	$	(749	)	Gain on sale of investments, net
	Related income tax expense			77			255		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			(149	)		(494	)	Net of tax
	Defined benefit pension plan:
	Amortization of net loss and prior service costs			21			294		Compensation and employee benefits
	Related income tax expense		$	(7	)	$	(100	)	Provision for income taxes
	Net effect on accumulated other			14			194		Net of tax
Total reclassification for the period		$	(135	)	$	(300	)	Net of tax

Acquisitions

Acquisitions	9 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	13	Acquisitions
	Acquisition of FNCB Branch
	On January 24, 2014, the Company closed on a purchase transaction pursuant to which ESSA Bancorp, Inc. acquired a branch facility, customer deposits, and loans of First National Community Bank (FNCB), the subsidiary of First National Community Bancorp, Inc., in a cash transaction. The acquired branch is located in the Monroe County, Pennsylvania market. Under the terms of the agreement, the Company acquired all of the branch facilities, customer deposits and loans of FNCB and received net cash of $4.6 million.
	The acquired assets and assumed liabilities were measured at fair values. Management made significant estimates and exercised significant judgment in accounting for the acquisition. Management measured loan fair values based on loan file reviews (including borrower financial statements or tax returns), appraised collateral values, expected cash flows and historical loss factors of FNCB. Real estate acquired through foreclosure was primarily value based on appraised collateral values.
	The business combination resulted in the acquisition of loans without evidence of credit quality deterioration. FNCB’s loans were fair valued by discounting both expected principal and interest cash flows using an observable discount rate for similar instruments that a market participant would consider in determining fair value. Additionally, consideration was given to management’s best estimates of default rates and payment speeds. At acquisition, FNCB’s loan portfolio without evidence of deterioration totaled $1.0 million and was recorded at a fair value of $1.0 million.
	The following condensed statement reflects the values assigned to FNCB’s net assets as of the acquisitions date:
	Total purchase price		$	4,460
	Net assets acquired:
	Cash		$	11
	Loans receivable and accrued interest receivable			1,033
	Premises and equipment, net			1,626
	Certificates of deposits			(3,069	)
	Deposits other than certificates of deposits			(5,683	)
				6,082
	Goodwill resulting from FNCB purchase		$	1,442
	Supplemental pro forma financial information related to the FNCB acquisition has not been provided as it would be impracticable to do so. Historical financial information regarding the acquired branch is not accessible and thus the amounts would require estimates so significant as to render the disclosure irrelevant.
	Acquisition of Franklin Security Bancorp, Inc.
	On April 4, 2014, the Company closed on a merger transaction pursuant to which ESSA Bancorp, Inc. acquired Franklin Security Bancorp, Inc., the parent company of Franklin Security Bank, in a cash transaction. The acquisition added two branch locations in the Scranton-Wilkes Barre, Pennsylvania market, establishing ESSA’s presence in that market.
	Under the terms of the merger agreement, the Company acquired all of the outstanding shares of Franklin Security Bancorp, Inc. for a total cash purchase price of approximately $15.7 million. Franklin Security Bank has been merged into ESSA Bank & Trust, with ESSA Bank & Trust as the surviving entity.
	The acquired assets and assumed liabilities were measured at estimated fair values. Management made significant estimates and exercised significant judgment in accounting for the acquisition. Management measured loan fair values based on loan file reviews (including borrower financial statements or tax returns), appraised collateral values, expected cash flows and historical loss factors of Franklin Security Bank. Real estate acquired through foreclosure was primarily valued based on appraised collateral values. The Company also recorded an identifiable intangible asset representing the core deposit base of Franklin Security Bank based on management’s evaluation of the cost of such deposits relative to alternative funding sources. Management used market quotations to measure the fair value of investment securities and FHLB advances. The business combination resulted in the acquisition of loans without evidence of credit quality deterioration. At the acquisition date, the Company determined that there were no purchased impaired loans. The method of measuring carrying value of purchased loans differs from loans originated by the Company (originated loans), and as such, the Company identifies purchased loans and purchased loans with a credit quality discount and originated loans at amortized cost.
	Franklin Security Bank’s loans without evidence of credit deterioration were measured to fair valued by discounting both expected principal and interest cash flows using an observable discount rate for similar instruments that a market participant would consider in determining fair value. Additionally, consideration was given to management’s best estimates of default rates and payment speeds. At acquisition, Franklin Security Bank’s loan portfolio without evidence of deterioration totaled $155.3 million and was recorded at a fair value of $152.2 million.
	The following condensed statement reflects the values assigned to Franklin Security Bancorp, Inc.’s net assets as of the acquisitions date:
	Total purchase price		$	15,698
	Net assets acquired:
	Cash		$	(19,825	)
	Investments available for sale			55,901
	Loans receivable			152,188
	Regulatory stock			1,569
	Premises and equipment, net			176
	Foreclosed real estate			436
	Intangible assets			889
	Deferred tax assets			1,031
	Other assets			2,504
	Certificates of deposits			(90,869	)
	Deposits other than certificates of deposits			(71,317	)
	Borrowings			(30,177	)
	Other liabilities			(2,265	)
	Gain resulting from Franklin Security Bancorp, Inc. acquisition		$	241
	Results of operations for Franklin prior to the acquisition date are not included in the Consolidated Statement of Income for the three and nine-month periods ended June 30, 2014. The following table presents financial information regarding the former Franklin operations included in the Consolidated Statement of Income from the date of acquisition through June 30, 2014 under column “Actual from acquisition date through June 30, 2014.” In addition, the following table presents unaudited pro forma information as if the acquisition of Franklin had occurred on October 1, 2012 under the “Pro Forma” columns. The table below has been prepared for comparative purposes only and is not necessarily indicative of the actual results that would have been attained had the acquisition occurred as of the beginning of the periods presented, nor is it indicative of future results. Furthermore, the unaudited pro forma information does not reflect management’s estimate of any revenue-enhancing opportunities nor anticipated cost savings as a result of the integration and consolidation of the acquisition. Merger and acquisition integration costs and amortization of fair value adjustments net of the related income tax effects are included in the amounts below, but any purchase gain has been excluded.
			Actual From Acquisition Date
			Through June 30, 2014
			(in thousands)
	Net interest income		$	1,902
	Non interest income			107
	Net income		$	641
			Pro Formas
			Three months ended					Nine months ended
			June 30,					June 30,
			2014			2013		2014		2013
			(in thousands, except per share data)
	Net interest income		$	11,097		$	11,267	$	32,534	$	34,791
	Non interest income			2,100			1,915		5,605		6,850
	Net income			2,385			2,036		4,471		7,184
	Pro forma earnings per share:
	Basic		$	0.22		$	0.18	$	0.41	$	0.61
	Diluted		$	0.22		$	0.18	$	0.41	$	0.61

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Jun. 30, 2014
Accounting Changes And Error Corrections [Abstract]	'
Financial Services Investment Companies	'
	In June 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-08, Financial Services – Investment Companies (Topic 946): Amendments to the Scope, Measurement, and Disclosure Requirements. The amendments in this Update affect the scope, measurement, and disclosure requirements for investment companies under U.S. GAAP. The amendments do all of the following: (1) change the approach to the investment company assessment in Topic 946, clarify the characteristics of an investment company, and provide comprehensive guidance for assessing whether an entity is an investment company; (2) require an investment company to measure noncontrolling ownership interests in other investment companies at fair value rather than using the equity method of accounting; and (3) require the following additional disclosures: (a) the fact that the entity is an investment company and is applying the guidance in Topic 946, (b) information about changes, if any, in an entity’s status as an investment company, and (c) information about financial support provided or contractually required to be provided by an investment company to any of its investees. The amendments in this Update are effective for an entity’s interim and annual reporting periods in fiscal years that begin after December 15, 2013. Earlier application is prohibited. This Update is not expected to have a significant impact on the Company’s financial statements.
Income Taxes	'
	In July 2013, the FASB issued ASU 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This Update applies to all entities that have unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. An unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The assessment of whether a deferred tax asset is available is based on the unrecognized tax benefit and deferred tax asset that exist at the reporting date and should be made presuming disallowance of the tax position at the reporting date. The amendments in this Update are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. This Update is not expected to have a significant impact on the Company’s financial statements.
Investments	'
	In January 2014, the FASB issued ASU 2014-01, Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. The amendments in this Update permit reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The amendments in this Update should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. The amendments in this Update are effective for public business entities for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014. Early adoption is permitted. This Update is not expected to have a significant impact on the Company’s financial statements.
Receivables Troubled Debt Restructurings	'
	In January 2014, the FASB issued ASU 2014-04, Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The amendments in this Update clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The amendments in this Update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. An entity can elect to adopt the amendments in this Update using either a modified retrospective transition method or a prospective transition method. This Update is not expected to have a significant impact on the Company’s financial statements.
Revenue from Contracts with Customers	'
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (a new revenue recognition standard). The Update’s core principle is that a company will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In addition, this update specifies the accounting for certain costs to obtain or fulfill a contract with a customer and expands disclosure requirements for revenue recognition. This Update is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. This update is not expected to have a significant impact on the Company’s financial statements.
Transfers and Servicing	'
	In June 2014, the FASB issued ASU 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures. The amendments in this Update change the accounting for repurchase-to-maturity transactions to secured borrowing accounting. For repurchase financing arrangements, the amendments require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments also require enhanced disclosures. The accounting changes in this Update are effective for the first interim or annual period beginning after December 15, 2014. An entity is required to present changes in accounting for transactions outstanding on the effective date as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Earlier application is prohibited. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, and the disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The disclosures are not required to be presented for comparative periods before the effective date. This Update is not expected to have a significant impact on the Company’s financial statements.
Compensation Stock Compensation	'
	In June 2014, the FASB issued ASU 2014-12, Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could Be Achieved After the Requisite Service Period. The amendments require that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The amendments in this Update are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Earlier adoption is permitted. Entities may apply the amendments in this Update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. If retrospective transition is adopted, the cumulative effect of applying this Update as of the beginning of the earliest annual period presented in the financial statements should be recognized as an adjustment to the opening retained earnings balance at that date. Additionally, if retrospective transition is adopted, an entity may use hindsight in measuring and recognizing the compensation cost. This Update is not expected to have a significant impact on the Company’s financial statements.

Earnings_per_Share_Tables

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2014
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, 2014 and 2013.
		Three months ended						Nine months ended
		June 30,			June 30,			June 30,			June 30,
		2014			2013			2014			2013
	Weighted-average common shares outstanding		18,133,095			18,162,764			18,133,095			18,142,984
	Average treasury stock shares		(6,272,961	)		(5,645,336	)		(6,233,349	)		(5,269,686	)
	Average unearned ESOP shares		(1,012,790	)		(1,058,066	)		(1,024,151	)		(1,069,427	)
	Average unearned non-vested shares		(9,752	)		(49,571	)		(11,233	)		(38,970	)
	Weighted average common shares and common stock equivalents used to calculate basic earnings per share		10,837,592			11,409,791			10,864,362			11,764,901
	Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share		—			—			—			—
	Additional common stock equivalents (stock options) used to calculate diluted earnings per share		—			—			—			—
	Weighted average common shares and common stock equivalents used to calculate diluted earnings per share		10,837,592			11,409,791			10,864,362			11,764,901

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Summary of Amortized Cost and Fair Value of Investment Securities Available for Sale	'
	The amortized cost and fair value of investment securities available for sale are summarized as follows (in thousands):
		June 30, 2014
		Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Available for Sale
	Fannie Mae	$	141,678	$	1,991	$	(1,230	)	$	142,439
	Freddie Mac		80,805		813		(1,017	)		80,601
	Governmental National Mortgage Association		31,709		170		(170	)		31,709
	Other mortgage-backed securities		2,839		—		(7	)		2,832
	Total mortgage-backed securities		257,031		2,974		(2,424	)		257,581
	Obligations of states and political subdivisions		42,067		1,390		(294	)		43,163
	U.S. government agency securities		48,037		240		(372	)		47,905
	Corporate obligations		13,169		262		(26	)		13,405
	Trust-preferred securities		5,003		688		—			5,691
	Other debt securities		5,233		40		(19	)		5,254
	Total debt securities		370,540		5,594		(3,135	)		372,999
	Equity securities - financial services		2,025		—		—			2,025
	Total	$	372,565	$	5,594	$	(3,135	)	$	375,024
		September 30, 2013
		Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Available for Sale
	Fannie Mae	$	114,927	$	1,691	$	(1,595	)	$	115,023
	Freddie Mac		60,111		838		(1,252	)		59,697
	Governmental National Mortgage Association		39,692		289		(230	)		39,751
	Other mortgage-backed securities		3,385		—		(19	)		3,366
	Total mortgage-backed securities		218,115		2,818		(3,096	)		217,837
	Obligations of states and political subdivisions		23,754		654		(499	)		23,909
	U.S. government agency securities		52,775		225		(480	)		52,520
	Corporate obligations		12,756		186		(169	)		12,773
	Trust-preferred securities		4,943		471		—			5,414
	Other debt securities		1,147		7		—			1,154
	Total debt securities		313,490		4,361		(4,244	)		313,607
	Equity securities - financial services		2,025		—		(10	)		2,015
	Total	$	315,515	$	4,361	$	(4,254	)	$	315,622
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, 2014, 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		Fair Value
		Cost
	Due in one year or less	$	2,130	$	2,144
	Due after one year through five years		47,511		47,901
	Due after five years through ten years		63,011		63,750
	Due after ten years		257,888		259,204
	Total	$	370,540	$	372,999

Unrealized_Losses_on_Securitie1

Unrealized Losses on Securities (Tables)	9 Months Ended
	Jun. 30, 2014
Text Block [Abstract]	'
Schedule of Gross Unrealized Losses and Fair Value	'
	The following table shows the Company’s gross unrealized losses and fair value, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position (in thousands):
		June 30, 2014
		Number of		Less than Twelve					Twelve Months or					Total
		Securities		Months					Greater
				Fair		Gross			Fair		Gross			Fair		Gross
				Value		Unrealized			Value		Unrealized			Value		Unrealized
						Losses					Losses					Losses
	Fannie Mae		24	$	6,381	$	(28	)	$	33,971	$	(1,202	)	$	40,352	$	(1,230	)
	Freddie Mac		23		9,551		(49	)		30,409		(968	)		39,960		(1,017	)
	Governmental National Mortgage Association		6		3,453		(11	)		6,245		(159	)		9,698		(170	)
	Other mortgage-backed securities		3		547		(1	)		2,286		(6	)		2,833		(7	)
	Obligations of states and political subdivisions		5		—		—			7,186		(294	)		7,186		(294	)
	U.S. government agency securities		10		4,004		(6	)		23,470		(366	)		27,474		(372	)
	Corporate obligations		5		1,990		(10	)		2,319		(16	)		4,309		(26	)
	Other debt securities		2		2,102		(19	)		—		—			2,102		(19	)
	Total		78	$	28,028	$	(124	)	$	105,886	$	(3,011	)	$	133,914	$	(3,135	)
	September 30, 2013
		Number of		Less than Twelve					Twelve Months or					Total
		Securities		Months					Greater
				Fair		Gross			Fair		Gross			Fair		Gross
				Value		Unrealized			Value		Unrealized			Value		Unrealized
						Losses					Losses					Losses
	Fannie Mae		30	$	47,814	$	(1,589	)	$	1,057	$	(6	)	$	48,871	$	(1,595	)
	Freddie Mac		20		32,781		(1,252	)				—			32,781		(1,252	)
	Governmental National Mortgage Association		6		10,301		(230	)		—		—			10,301		(230	)
	Other mortgage-backed securities		3		3,366		(19	)		—		—			3,366		(19	)
	Obligations of states and political subdivisions		7		8,064		(499	)		—		—			8,064		(499	)
	U.S. government agency securities		10		30,084		(479	)		999		(1	)		31,083		(480	)
	Corporate obligations		5		5,042		(169	)		—		—			5,042		(169	)
	Equity securities-financial services		1		1,990		(10	)		—		—			1,990		(10	)
	Total		82	$	139,442	$	(4,247	)	$	2,056	$	(7	)	$	141,498	$	(4,254	)

Loans_Receivable_Net_and_Allow1

Loans Receivable, Net and Allowance for Loan Losses (Tables)	9 Months Ended
	Jun. 30, 2014
Summary of Loans Receivable	'
	Loans receivable consist of the following (in thousands):
		June 30,			September 30,
		2014			2013
	Held for investment:
	Real Estate Loans:
	Residential	$	667,316		$	686,651
	Construction		1,800			2,288
	Commercial		188,343			159,469
	Commercial		23,331			10,125
	Obligations of states and political subdivisions		50,096			33,445
	Home equity loans and lines of credit		40,866			41,923
	Auto Loans		83,619			61
	Other		3,590			2,332
			1,058,961			936,294
	Less allowance for loan losses		8,836			8,064
	Net loans	$	1,050,125		$	928,230
Schedule of Loans Evaluated for Impairment	'
		Total Loans			Individually Evaluated for			Loans Acquired with			Collectively Evaluated
					Impairment			Deteriorated Credit Quality			for Impairment
	June 30, 2014
	Real Estate Loans:
	Residential	$	667,316		$	13,093		$	109		$	654,114
	Construction		1,800			—			—			1,800
	Commercial		188,343			17,912			5,151			165,280
	Commercial		23,331			536			293			22,502
	Obligations of states and political subdivisions		50,096			—			—			50,096
	Home Equity loans and lines of credit		40,866			220			—			40,646
	Auto Loans		83,619			—			—			83,619
	Other		3,590			—			—			3,590
	Total	$	1,058,961		$	31,761		$	5,553		$	1,021,647
		Total Loans			Individually Evaluated for			Loans Acquired with			Collectively Evaluated
					Impairment			Deteriorated Credit Quality			for Impairment
	September 30, 2013
	Real Estate Loans:
	Residential	$	686,651		$	14,018		$	271		$	672,362
	Construction		2,288			—			—			2,288
	Commercial		159,469			15,478			6,355			137,636
	Commercial		10,125			220			502			9,403
	Obligations of states and political subdivisions		33,445			—			—			33,445
	Home Equity loans and lines of credit		41,923			379			3			41,541
	Auto Loans		61			—			—			61
	Other		2,332			—			—			2,332
	Total	$	936,294		$	30,095		$	7,131		$	899,068
Schedule of Investment and Unpaid Principal Balances for Impaired Loans	'
	The following table includes the recorded investment and unpaid principal balances for impaired loans with the associated allowance amount, if applicable. Also presented are the average recorded investments in the impaired loans and the related amount of interest recognized during the time within the period that the impaired loans were impaired.
		Recorded			Unpaid			Associated			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
	June 30, 2014
	With no specific allowance recorded:
	Real Estate Loans
	Residential	$	8,512		$	10,603		$	—		$	9,566		$	242
	Construction		—			—			—			—			—
	Commercial		22,252			23,205			—			20,241			553
	Commercial		829			834			—			1,764			49
	Obligations of states and political subdivisions		—			—			—			—			—
	Home equity loans and lines of credit		183			458			—			285			4
	Auto Loans		—			—			—			—			—
	Other		—			—			—			—			—
	Total		31,776			35,100			—			31,856			848
	With an allowance recorded:
	Real Estate Loans
	Residential		4,690			5,258			531			3,425			79
	Construction		—			—			—			—			—
	Commercial		811			847			96			1,896			—
	Commercial		—			—			—			—			—
	Obligations of states and political subdivisions		—			—			—			—			—
	Home equity loans and lines of credit		37			45			37			17			—
	Auto Loans		—			—			—			—			—
	Other		—			—			—			—			—
	Total		5,538			6,150			664			5,338			79
	Total:
	Real Estate Loans
	Residential		13,202			15,861			531			12,991			321
	Construction		—			—			—			—			—
	Commercial		23,063			24,052			96			22,137			553
	Commercial		829			834			—			1,764			49
	Obligations of states and political subdivisions		—			—			—			—			—
	Home equity loans and lines of credit		220			503			37			302			4
	Auto Loans		—			—						—			—
	Other		—			—			—			—			—
	Total Impaired Loans	$	37,314		$	41,250		$	664		$	37,194		$	927
		Recorded			Unpaid			Associated			Average			Interest
		Investment			Principal			Allowance			Recorded			Income
					Balance						Investment			Recognized
	September 30, 2013
	With no specific allowance recorded:
	Real Estate Loans
	Residential	$	11,251		$	13,013		$	—		$	9,716		$	159
	Construction		—			—			—			—			—
	Commercial		18,711			20,258			—			20,751			615
	Commercial		722			731			—			1,034			9
	Obligations of states and political subdivisions		—			—			—			—			—
	Home equity loans and lines of credit		382			683			—			373			3
	Other		—			—			—			18			—
	Total		31,066			34,685			—			31,892			786
	With an allowance recorded:
	Real Estate Loans
	Residential		3,038			3,221			518			2,655			74
	Construction		—			—			—			—			—
	Commercial		3,122			3,178			301			2,839
	Commercial		—			—			—			—			—
	Obligations of states and political subdivisions		—			—			—			—			—
	Home equity loans and lines of credit		—			—			—			—
	Other		—			—			—			—			—
	Total		6,160			6,399			819			5,494			74
	Total:
Real Estate Loans
Residential		14,289			16,234			518			12,371			233
Construction		—			—			—			—			—
Commercial		21,833			23,436			301			23,590			615
Commercial		722			731			—			1,034			9
Obligations of states and political subdivisions		—			—			—			—			—
Home equity loans and lines of credit		382			683			—			373			3
Other		—			—			—			18			—
Total Impaired Loans	$	37,226		$	41,084		$	819		$	37,386		$	860
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 within the internal risk rating system as of June 30, 2014 and September 30, 2013 (in thousands):
		Pass			Special			Substandard			Doubtful			Total
					Mention
	June 30, 2014
	Commercial real estate loans	$	157,359		$	8,576		$	22,106		$	302		$	188,343
	Commercial		22,295			375			661			—			23,331
	Obligations of states and political subdivisions		50,096			—			—			—			50,096
	Total	$	229,750		$	8,951		$	22,767		$	302		$	261,770
		Pass			Special			Substandard			Doubtful			Total
					Mention
	September 30, 2013
	Commercial real estate loans	$	129,799		$	9,440		$	20,230		$	—		$	159,469
	Commercial		9,466			436			223			—			10,125
	Obligations of states and political subdivisions		33,445			—			—			—			33,445
	Total	$	172,710		$	9,876		$	20,453		$	—		$	203,039
Schedule of Performing or Nonperforming Loans	'
	The following tables present the risk ratings in the consumer categories of performing and non-performing loans at June 30, 2014 and September 30, 2013 (in thousands):
		Performing			Non-performing			Total
	June 30, 2014
	Real estate loans:
	Residential	$	656,893		$	10,423		$	667,316
	Construction		1,800			—			1,800
	Home Equity loans and lines of credit		40,613			253			40,866
	Auto Loans		83,594			25			83,619
	Other		3,577			13			3,590
	Total	$	786,477		$	10,714		$	797,191
		Performing			Non-performing			Total
	September 30, 2013
	Real estate loans:
	Residential	$	675,706		$	10,945		$	686,651
	Construction		2,288			—			2,288
	Home Equity loans and lines of credit		41,584			339			41,923
	Auto loans		61			—			61
	Other		2,332			—			2,332
	Total	$	721,971		$	11,284		$	733,255
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, 2014 and September 30, 2013 (in thousands):
		Current			31-60 Days			61-90 Days			Greater than			Non-Accrual			Total Past			Total
					Past Due			Past Due			90 Days Past						Due and			Loans
											Due and still						Non-
											accruing						Accrual
	June 30, 2014
	Real estate loans
	Residential	$	652,247		$	3,857		$	789		$	—		$	10,423		$	15,069		$	667,316
	Construction		1,800			—			—			—			—			—			1,800
	Commercial		177,162			283			—			—			10,898			11,181			188,343
	Commercial		21,682			204			127			—			1,318			1,649			23,331
	Obligations of states and political subdivisions		50,077			19			—			—			—			19			50,096
	Home equity loans and lines of credit		40,514			69			30			—			253			352			40,866
	Auto Loans		83,312			282			—			—			25			307			83,619
	Other		3,517			51			9			—			13			73			3,590
	Total	$	1,030,311		$	4,765		$	955		$	—		$	22,930		$	28,650		$	1,058,961
		Current			31-60 Days			61-90 Days			Greater than			Non-Accrual			Total Past			Total
					Past Due			Past Due			90 Days Past						Due and			Loans
											Due and still						Non-
											accruing						Accrual
	September 30, 2013
	Real estate loans
	Residential	$	671,850		$	2,866		$	990		$	—		$	10,945		$	14,801		$	686,651
	Construction		2,288			—			—			—			—			—			2,288
	Commercial		146,062			2,589						—			10,818			13,407			159,469
	Commercial		8,948			—			—			—			1,177			1,177			10,125
	Obligations of states and political subdivisions		33,445			—			—			—			—			—			33,445
	Home equity loans and lines of credit		41,380			127			77			—			339			543			41,923
	Auto loans		61			—			—			—			—			—			61
	Other		2,275			57			—			—			—			57			2,332
	Total	$	906,309		$	5,639		$	1,067		$	—		$	23,279		$	29,985		$	936,294
Summary of Primary Segments of ALL	'
	The following tables summarize changes in the primary segments of the ALL for the three and nine month periods ending June 30, 2014 and 2013:
		Real Estate Loans
		Residential			Construction			Commercial			Commercial			Obligations of			Home			Auto		Other Loans			Unallocated		Total
											Loans			States and			Equity			Loans
														Political			Loans and
														Subdivisions			Lines of
																	Credit
	ALL balance at March 31, 2014		5,920			26			1,003			369			106			500			—		26			712		8,662
	Charge-offs		(332	)		—			(23	)		—			—			(10	)		—		—			—		(365	)
	Recoveries		34			—			—			2			—			—			—		3			—		39
	Provision		312			(2	)		(399	)		222			10			(17	)		56		(3	)		321		500
	ALL balance at June 30, 2014		5,934			24			581			593			116			473			56		26			1,033		8,836
	March 31, 2013		5,791			28			837			350			106			496			—		19			44		7,671
	Charge-offs		(509	)		—			(74	)		(16	)		—			—			—		—			—		(599	)
	Recoveries		9			—			—			—			—			3			—		—			—		12
	Provision		676			16			262			27			7			97			—		1			14		1,100
	ALL balance at June 30, 2013		5,967			44			1,025			361			113			596			—		20			58		8,184
	ALL balance at September 30, 2013		5,787			20			946			337			130			430			—		21			393		8,064
	Charge-offs		(1,255	)		—			(73	)		(48	)		—			(73	)		—		—			—		(1,449	)
	Recoveries		112			—			83			14			—			—			—		12			—		221
	Provision		1,290			4			(375	)		290			(14	)		116			56		(7	)		640		2,000
	ALL balance at June 30, 2014		5,934			24			581			593			116			473			56		26			1,033		8,836
	September 30, 2012		5,401			29			699			474			127			499			—		22			51		7,302
	Charge-offs		(1,752	)		—			(288	)		(16	)		—			(67	)		—		(6	)		—		(2,129	)
	Recoveries		50			—			2			—			—			9			—		—			—		61
	Provision		2,268			15			612			(97	)		(14	)		155			—		4			7		2,950
	ALL balance at June 30, 2013		5,967			44			1,025			361			113			596			—		20			58		8,184
	The following table summarizes the primary segments of the ALL, segregated into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment as of June 30, 2014 (in thousands):
		Real Estate Loans
		Residential			Construction			Commercial			Commercial			Obligations of			Home			Auto		Other Loans			Unallocated		Total
											Loans			States and			Equity			Loans
														Political			Loans and
														Subdivisions			Lines of
																	Credit
	Individually evaluated for impairment		531			—			96			—			—			37			—		—			—		664
	Collectively evaluated for impairment		5,403			24			485			593			116			436			56		26			1,033		8,172
	ALL Balance at June 30, 2014		5,934			24			581			593			116			473			56		26			1,033		8,836
	Individually evaluated for impairment		518			—			301			—			—			—			—		—			—		819
	Collectively evaluated for impairment		5,269			20			645			337			130			430			—		21			393		7,245
	ALL balance at September 30, 2013		5,787			20			946			337			130			430			—		21			393		8,064
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, 2014 and 2013.
		For the Three Months Ended June 30, 2014
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
	Troubled Debt Restructurings
	Real estate loans:
	Residential		2		$	236		$	236
	Construction		—			—			—
	Commercial		—			—			—
	Commercial		—			—			—
	Obligations of states and political subdivisions		—			—			—
	Home equity loans and lines of credit		—			—			—
	Auto Loans		—			—			—
	Other		—			—			—
	Total		2		$	236		$	236
	Of the two new troubled debt restructurings granted for the three months ended June 30, 2014, one loan totaling $208,000 was granted terms and rate concessions and one loan totaling $28,000 was granted terms concessions.
		For the Three Months Ended June 30, 2013
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
	Troubled Debt Restructurings
	Real estate loans:
	Residential		8		$	989		$	989
	Construction		—			—			—
	Commercial		—			—			—
	Commercial		—			—			—
	Obligations of states and political subdivisions		—			—			—
	Home equity loans and lines of credit		1			98			98
	Auto Loans		—			—			—
	Other		—			—			—
	Total		9		$	1,087		$	1,087
	Of the nine new troubled debt restructurings granted for the three months ended June 30, 2013, six loans totaling $751,000 were granted terms and rate concessions and three loans totaling $336,000 were granted terms concessions.
		For the Nine Months Ended June 30, 2014
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
	Troubled Debt Restructurings
	Real estate loans:
	Residential		9		$	1,293		$	1,293
	Construction		—			—			—
	Commercial		1			197			197
	Commercial		—			—			—
	Obligations of states and political subdivisions		—			—			—
	Home equity loans and lines of credit		—			—			—
	Auto Loans		—			—			—
	Other		—			—			—
	Total		10		$	1,490		$	1,490
	Of the ten new troubled debt restructurings granted for the nine months ended June 30, 2014, six loans totaling $883,000 were granted terms and rate concessions and four loans totaling $607,000 were granted terms concessions.
		For the Nine Months Ended June 30, 2013
		Number of			Pre-Modification			Post-Modification
		Contracts			Outstanding			Outstanding
					Recorded			Recorded
					Investment			Investment
	Troubled Debt Restructurings
	Real estate loans:
	Residential		12		$	1,589		$	1,589
	Construction		—			—			—
	Commercial		—			—			—
	Commercial		—			—			—
Obligations of states and political subdivisions		—			—			—
Home equity loans and lines of credit		1			98			98
Auto Loans
Other		—			—			—
Total		13		$	1,687		$	1,687
First National Community Bank [Member]	'
Summary of Loans Receivable	'
	Included in the June 30, 2014 balances are loans acquired from FNCB, as of the acquisition date of January 24,2014 as follows:
	Real Estate Loans:
	Residential	$	933
	Home equity loans and lines of credit		77
	Other		20
	Total loans	$	1,030
Franklin Security Bank [Member]	'
Summary of Loans Receivable	'
	Included in the June 30, 2014 balances are loans acquired from Franklin Security Bank, as of the acquisition date of April 4, 2014 as follows:
	Real Estate Loans:
	Residential	$	17,151
	Commercial		38,247
	Commercial		9,308
	Obligations of states and political subdivisions		7,309
	Home equity loans and lines of credit		16
	Auto loans		78,794
	Other		1,363
	Total loans	$	152,188

Deposits_Tables

Deposits (Tables)	9 Months Ended
	Jun. 30, 2014
Banking And Thrift [Abstract]	'
Schedule of Deposits by Major Classifications	'
	Deposits consist of the following major classifications (in thousands):
		June 30,		September 30,
		2014		2013
	Non-interest bearing demand accounts	$	70,980	$	58,795
	NOW accounts		120,939		99,857
	Money market accounts		178,263		138,049
	Savings and club accounts		124,812		110,189
	Certificates of deposit		648,101		634,169
	Total	$	1,143,095	$	1,041,059

Net_Periodic_Benefit_CostDefin1

Net Periodic Benefit Cost-Defined Benefit Plan (Tables)	9 Months Ended
	Jun. 30, 2014
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 periods ended (in thousands):
		Three Months Ended						Nine Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Service Cost	$	144		$	175		$	433		$	526
	Interest Cost		191			179			572			537
	Expected return on plan assets		(290	)		(259	)		(871	)		(776	)
	Amortization of unrecognized loss		7			98			21			294
	Net periodic benefit cost	$	52		$	193		$	155		$	581

Equity_Incentive_Plan_Tables

Equity Incentive Plan (Tables)	9 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [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 six month period ended June 30, 2014.
		Number of Stock		Weighted-		Weighted-		Aggregate
		Options		average		average		Intrinsic
				Exercise		Remaining		Value
				Price		Contractual		(in thousands)
						Term (in years)
	Outstanding, September 30, 2013		1,458,379	$	12.35		4.67	$	—
	Granted		—		—		—		—
	Exercised		—		—		—		—
	Forfeited		—		—		—		—
	Outstanding, June 30, 2014		1,458,379	$	12.35		3.9	$	—
	Exercisable at June 30, 2014		1,458,379	$	12.35		3.9	$	—
Schedule of Restricted Stock Option Activity	'
	The following is a summary of the status of the Company’s restricted stock as of June 30, 2014, and changes therein during the six month period then ended:
		Number of		Weighted-
		Restricted Stock		average
				Grant Date
				Fair Value
	Nonvested at September 30, 2013		14,995	$	10.94
	Granted		—		—
	Vested		1,661		10.94
	Forfeited		—		—
	Nonvested at June 30, 2014		13,334	$	10.94

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Securities, Other Real Estate Owned and Impaired Loans Measured at Fair Value	'
	The following table presents information about the Company’s securities, other real estate owned and impaired loans measured at fair value as of June 30, 2014 and September 30, 2013 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, 2014
	Fair Value Measurements Utilized for the		Quoted Prices in Active		Significant Other			Significant		Balances as of
	Company’s Financial Assets (in thousands):		Markets for Identical Assets		Observable Inputs			Unobservable Inputs		September 30, 2013
			(Level 1)		(Level 2)			(Level 3)
	Securities available-for-sale measured on a recurring basis
	Mortgage backed securities		$	—	$	257,581		$	—	$	257,581
	Obligations of states and political subdivisions			—		43,163			—		43,163
	U.S. government agencies			—		47,905			—		47,905
	Corporate obligations			—		13,405			—		13,405
	Trust-preferred securities			—		3,861			1,830		5,691
	Other debt securities			—		5,254			—		5,254
	Equity securities-financial services			2,025		—			—		2,025
	Total debt and equity securities		$	2,025	$	371,169		$	1,830	$	375,024
	Foreclosed real estate owned measured on a non-recurring basis		$	—	$	—		$	2,967	$	2,967
	Impaired loans measured on a non-recurring basis		$	—	$	—		$	36,650	$	36,650
			Fair Value Measurement at September 30, 2013
	Fair Value Measurements Utilized for the		Quoted Prices in Active		Significant Other			Significant		Balances as of
	Company’s Financial Assets (in thousands):		Markets for Identical Assets		Observable Inputs			Unobservable Inputs		September 30, 2013
			(Level 1)		(Level 2)			(Level 3)
	Securities available-for-sale measured on a recurring basis
	Mortgage backed securities		$	—	$	217,837		$	—	$	217,837
	Obligations of states and political subdivisions			—		23,909			—		23,909
	U.S. government agencies			—		52,520			—		52,520
	Corporate obligations			—		12,773			—		12,773
	Trust-preferred securities			—		3,614			1,800		5,414
	Other debt securities			—		1,154			—		1,154
	Equity securities-financial services			2,015		—			—		2,015
	Total debt and equity securities		$	2,015	$	311,807		$	1,800	$	315,622
	Foreclosed real estate owned measured on a non-recurring basis		$	—	$	—		$	2,111	$	2,111
	Impaired loans measured on a non-recurring basis		$	—	$	—		$	36,407	$	36,407
Schedule of Changes in Fair Value of Level III Investments	'
	The following table presents a summary of changes in the fair value of the Company’s Level III investments for the periods ended June 30, 2014 and June 30, 2013.
			Fair Value Measurement Using Significant Unobservable Inputs
			(Level III)
			Three months ended
			June 30, 2014		June 30, 2013
	Beginning balance		$	1,830	$	1,760
	Purchases, sales, issuances, settlements, net			—		—
	Total unrealized gain:
	Included in earnings			—
	Included in other comprehensive income			—		20
	Transfers in and/or out of Level III			—		—
			$	1,830	$	1,780
			Fair Value Measurement Using Significant Unobservable Inputs
			(Level III)
			Nine months ended
			June 30, 2014		June 30, 2013
	Beginning balance		$	1,800	$	1,740
	Purchases, sales, issuances, settlements, net			—		—
	Total unrealized gain:
	Included in earnings			—		—
	Included in other comprehensive income			30		40
	Transfers in and/or out of Level III			—		—
			$	1,830	$	1,780
Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis	'
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which the Company has utilized Level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	(unaudited, in thousands)		Fair Value		Valuation		Unobservable	Range
			Estimate		Techniques		Input
	June 30, 2014:
	Impaired loans			36,650	Appraisal of		Appraisal	0% to 30%
					collateral (1)		adjustments (2)	-23.00%
	Foreclosed real estate owned			2,967	Appraisal of		Appraisal	20% to 40%
					collateral (1), (3)		adjustments (2)	-21.40%
			Quantitative Information about Level 3 Fair Value Measurements
	(unaudited, in thousands)		Fair Value		Valuation		Unobservable	Range
			Estimate		Techniques		Input
	September 30, 2013:
	Impaired loans			36,407	Appraisal of		Appraisal	0% to 30%
					collateral (1)		adjustments (2)	-23.50%
	Foreclosed real estate owned			2,111	Appraisal of		Appraisal	0% to 30%
					collateral (1), (3)		adjustments (2)	-20.40%
	-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.
	-3	Includes qualitative adjustments by management and estimated liquidation expenses.
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.
			June 30, 2014
			Carrying Value		Level I			Level II		Level III		Total Fair
												Value
	Financial assets:
	Cash and cash equivalents		$	23,480	$	23,480		$	—	$	—	$	23,480
	Certificates of deposit			1,767		—			1,767		—		1,767
	Investment and mortgage backed securities available for sale			375,024		2,025			371,169		1,830		375,024
	Loans receivable, net			1,050,125		—			—		1,078,683		1,078,683
	Accrued interest receivable			5,042		5,042			—		—		5,042
	FHLB stock			12,757		12,757			—		—		12,757
	Mortgage servicing rights			799		—			—		799		799
	Bank owned life insurance			29,484		29,484			—		—		29,484
	Financial liabilities:
	Deposits		$	1,143,095	$	494,994		$	—	$	651,908		1,146,902
	Short-term borrowings			78,749		78,749			—		—		78,749
	Other borrowings			145,260		—			—		146,398		146,398
	Advances by borrowers for taxes and insurance			11,924		11,924			—		—		11,924
	Accrued interest payable			1,035		1,035			—		—		1,035
			September 30, 2013
			Carrying Value		Level I			Level II		Level III		Total Fair
												Value
	Financial assets:
	Cash and cash equivalents		$	26,648	$	26,648		$	—	$	—	$	26,648
	Certificates of deposit			1,767		—			1,767		—		1,767
	Investment and mortgage backed securities available for sale			315,622		2,015			311,807		1,800		315,622
	Loans receivable, net			928,230		—			—		951,120		951,120
	Accrued interest receivable			4,413		4,413			—		—		4,413
	FHLB stock			9,415		9,415			—		—		9,415
	Mortgage servicing rights			382		—			—		382		382
	Bank owned life insurance			28,797		28,797			—		—		28,797
	Financial liabilities:
	Deposits		$	1,041,059	$	406,890		$	—	$	638,510		1,045,400
	Short-term borrowings			23,000		23,000			—		—		23,000
	Other borrowings			129,260		—			—		124,504		124,504
	Advances by borrowers for taxes and insurance			4,962		4,962			—		—		4,962
	Accrued interest payable			833		833			—		—		833

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables) (Reclassification Out of Accumulated Other Comprehensive Income [Member])	9 Months Ended
	Jun. 30, 2014
Reclassification Out of Accumulated Other Comprehensive Income [Member]	'
Activity in Accumulated Other Comprehensive Income	'
	The activity in accumulated other comprehensive income for the three and nine months ended June 30, 2014 and 2013 is as follows:
		Accumulated Other
		Comprehensive Income/(Loss)
		Defined Benefit			Unrealized Gains			Total
		Pension Plan			(Losses) on Securities
					Available for Sale
	Balance at March 31, 2014	$	(1,297	)	$	(549	)	$	(1,846	)
	Other comprehensive income before reclassifications		—			2,165			2,165
	Amounts reclassified from accumulated other comprehensive income		5			7			12
	Period change		5			2,172			2,177
	Balance at June 30, 2014	$	(1,292	)	$	1,623		$	331
	Balance at March 31, 2013	$	(4,318	)	$	4,481		$	163
	Other comprehensive loss before reclassifications		—			(4,194	)		(4,194	)
	Amounts reclassified from accumulated other comprehensive income		65			(7	)		58
	Period change		65			(4,201	)		(4,136	)
	Balance at June 30, 2013	$	(4,253	)	$	280		$	(3,973	)
		Accumulated Other
		Comprehensive Income/(Loss)
		Defined Benefit			Unrealized Gains			Total
		Pension Plan			(Losses) on Securities
					Available for Sale
	Balance at September 30, 2013	$	(1,306	)	$	71		$	(1,235	)
	Other comprehensive income before reclassifications		—			1,701			1,701
	Amounts reclassified from accumulated other comprehensive income		14			(149	)		(135	)
	Period change		14			1,552			1,566
	Balance at June 30, 2014	$	(1,292	)	$	1,623		$	331
	Balance at September 30, 2012	$	(4,450	)	$	6,208		$	1,758
	Other comprehensive loss before reclassifications		—			(5,431	)		(5,431	)
	Amounts reclassified from accumulated other comprehensive income		194			(494	)		(300	)
	Period change		194			(5,925	)		(5,731	)
	Balance at June 30, 2013	$	(4,256	)	$	283		$	(3,973	)
		Amount Reclassified from
		Accumulated Other Comprehensive Income
		Accumulated Other						Affected Line Item in the Consolidated
		Comprehensive Income for						Statement of Income
		the Three Months Ended
		June 30,
		2014			2013
	Securities available for sale:
	Net securities gains reclassified into earnings	$	10		$	(11	)	Gain on sale of investments, net
	Related income tax expense		(3	)		4		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period		7			(7	)	Net of tax
	Defined benefit pension plan:
	Amortization of net loss and prior service costs		7			98		Compensation and employee benefits
	Related income tax expense	$	(2	)	$	(33	)	Provision for income taxes
	Net effect on accumulated other		5			65		Net of tax
	Total reclassification for the period	$	12		$	58		Net of tax
		Amount Reclassified from
		Accumulated Other Comprehensive Income
		Accumulated Other						Affected Line Item in the Consolidated
		Comprehensive Income for						Statement of Income
		the Nine months Ended
		June 30,
		2014			2013
	Securities available for sale:
	Net securities gains reclassified into earnings	$	(226	)	$	(749	)	Gain on sale of investments, net
	Related income tax expense		77			255		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period		(149	)		(494	)	Net of tax
	Defined benefit pension plan:
	Amortization of net loss and prior service costs		21			294		Compensation and employee benefits
	Related income tax expense	$	(7	)	$	(100	)	Provision for income taxes
	Net effect on accumulated other		14			194		Net of tax
	Total reclassification for the period	$	(135	)	$	(300	)	Net of tax

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Jun. 30, 2014
Franklin Security Bancorp, Inc. [Member]	'
Condensed Statement Reflecting Values Assigned to Net Assets	'
	The following condensed statement reflects the values assigned to Franklin Security Bancorp, Inc.’s net assets as of the acquisitions date:
	Total purchase price	$	15,698
	Net assets acquired:
	Cash	$	(19,825	)
	Investments available for sale		55,901
	Loans receivable		152,188
	Regulatory stock		1,569
	Premises and equipment, net		176
	Foreclosed real estate		436
	Intangible assets		889
	Deferred tax assets		1,031
	Other assets		2,504
	Certificates of deposits		(90,869	)
	Deposits other than certificates of deposits		(71,317	)
	Borrowings		(30,177	)
	Other liabilities		(2,265	)
	Gain resulting from Franklin Security Bancorp, Inc. acquisition	$	241
Financial Information Regarding Former First Star Operations Included in Consolidated Statement of Income	'
	The following table presents financial information regarding the former Franklin operations included in the Consolidated Statement of Income from the date of acquisition through June 30, 2014 under column “Actual from acquisition date through June 30, 2014.” In addition, the following table presents unaudited pro forma information as if the acquisition of Franklin had occurred on October 1, 2012 under the “Pro Forma” columns. The table below has been prepared for comparative purposes only and is not necessarily indicative of the actual results that would have been attained had the acquisition occurred as of the beginning of the periods presented, nor is it indicative of future results. Furthermore, the unaudited pro forma information does not reflect management’s estimate of any revenue-enhancing opportunities nor anticipated cost savings as a result of the integration and consolidation of the acquisition. Merger and acquisition integration costs and amortization of fair value adjustments net of the related income tax effects are included in the amounts below, but any purchase gain has been excluded.
		Actual From Acquisition Date
		Through June 30, 2014
		(in thousands)
	Net interest income	$	1,902
	Non interest income		107
	Net income	$	641
		Pro Formas
		Three months ended					Nine months ended
		June 30,					June 30,
		2014			2013		2014		2013
		(in thousands, except per share data)
	Net interest income	$	11,097		$	11,267	$	32,534	$	34,791
	Non interest income		2,100			1,915		5,605		6,850
	Net income		2,385			2,036		4,471		7,184
	Pro forma earnings per share:
	Basic	$	0.22		$	0.18	$	0.41	$	0.61
	Diluted	$	0.22		$	0.18	$	0.41	$	0.61
FNCB Branch [Member]	'
Condensed Statement Reflecting Values Assigned to Net Assets	'
	The following condensed statement reflects the values assigned to FNCB’s net assets as of the acquisitions date:
	Total purchase price	$	4,460
	Net assets acquired:
	Cash	$	11
	Loans receivable and accrued interest receivable		1,033
	Premises and equipment, net		1,626
	Certificates of deposits		(3,069	)
	Deposits other than certificates of deposits		(5,683	)
			6,082
	Goodwill resulting from FNCB purchase	$	1,442

Nature_of_Operations_and_Basis1

Nature of Operations and Basis of Presentation - Additional Information (Detail)	Jun. 30, 2014
Collaboration Arrangement Disclosure [Abstract]	'
Percentage ownership of wholly owned subsidiary	100.00%

Earnings_Per_Share_Composition

Earnings Per Share - Composition of the Weighted-Average Common Shares (Denominator) Used in the Basic and Diluted Earnings per Share Computation (Detail)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Weighted-average common shares outstanding	18,133,095	18,162,764	18,133,095	18,142,984
Average treasury stock shares	-6,272,961	-5,645,336	-6,233,349	-5,269,686
Average unearned ESOP shares	-1,012,790	-1,058,066	-1,024,151	-1,069,427
Average unearned non-vested shares	-9,752	-49,571	-11,233	-38,970
Average unearned non-vested shares	10,837,592	11,409,791	10,864,362	11,764,901
Weighted average common shares and common stock equivalents used to calculate basic earnings per share	10,837,592	11,409,791	10,864,362	11,764,901
Additional common stock equivalents (non-vested stock) used to calculate diluted earnings per share	'	'	'	'
Additional common stock equivalents (stock options) used to calculate diluted earnings per share	'	'	'	'
Weighted average common shares and common stock equivalents used to calculate diluted earnings per share	10,837,592	11,409,791	10,864,362	11,764,901

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail) (USD $)	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Stock Option [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Anti-dilutive securities	1,458,379	1,458,379
Price per share of anti-dilutive shares	$12.35	$12.35
Stock Compensation Plan [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Anti-dilutive securities	4,440	24,999
Price per share of anti-dilutive shares	$10.94	$12.35

Investment_Securities_Summary_

Investment Securities - Summary of Amortized Cost and Fair Value of Investment Securities Available for Sale (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	$372,565	$315,515
Available for Sale, Gross Unrealized Gains	5,594	4,361
Available for Sale, Gross Unrealized Losses	-3,135	-4,254
Available for Sale, Fair Value	375,024	315,622
Fannie Mae [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	141,678	114,927
Available for Sale, Gross Unrealized Gains	1,991	1,691
Available for Sale, Gross Unrealized Losses	-1,230	-1,595
Available for Sale, Fair Value	142,439	115,023
Freddie Mac [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	80,805	60,111
Available for Sale, Gross Unrealized Gains	813	838
Available for Sale, Gross Unrealized Losses	-1,017	-1,252
Available for Sale, Fair Value	80,601	59,697
Governmental National Mortgage Association [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	31,709	39,692
Available for Sale, Gross Unrealized Gains	170	289
Available for Sale, Gross Unrealized Losses	-170	-230
Available for Sale, Fair Value	31,709	39,751
Other Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	2,839	3,385
Available for Sale, Gross Unrealized Losses	-7	-19
Available for Sale, Fair Value	2,832	3,366
Total Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	257,031	218,115
Available for Sale, Gross Unrealized Gains	2,974	2,818
Available for Sale, Gross Unrealized Losses	-2,424	-3,096
Available for Sale, Fair Value	257,581	217,837
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	42,067	23,754
Available for Sale, Gross Unrealized Gains	1,390	654
Available for Sale, Gross Unrealized Losses	-294	-499
Available for Sale, Fair Value	43,163	23,909
U.S. Government Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	48,037	52,775
Available for Sale, Gross Unrealized Gains	240	225
Available for Sale, Gross Unrealized Losses	-372	-480
Available for Sale, Fair Value	47,905	52,520
Corporate Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	13,169	12,756
Available for Sale, Gross Unrealized Gains	262	186
Available for Sale, Gross Unrealized Losses	-26	-169
Available for Sale, Fair Value	13,405	12,773
Trust-Preferred Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	5,003	4,943
Available for Sale, Gross Unrealized Gains	688	471
Available for Sale, Fair Value	5,691	5,414
Other Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	5,233	1,147
Available for Sale, Gross Unrealized Gains	40	7
Available for Sale, Gross Unrealized Losses	-19	'
Available for Sale, Fair Value	5,254	1,154
Total Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	370,540	313,490
Available for Sale, Gross Unrealized Gains	5,594	4,361
Available for Sale, Gross Unrealized Losses	-3,135	-4,244
Available for Sale, Fair Value	372,999	313,607
Equity Securities-Financial Services [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available for Sale, Amortized Cost	2,025	2,025
Available for Sale, Gross Unrealized Losses	'	-10
Available for Sale, Fair Value	$2,025	$2,015

Investment_Securities_Schedule

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]	'
Due in one year or less, Amortized Cost	$2,130
Due after one year through five years, Amortized Cost	47,511
Due after five years through ten years, Amortized Cost	63,011
Due after ten years, Amortized Cost	257,888
Total, Amortized Cost	370,540
Due in one year or less, Fair Value	2,144
Due after one year through five years, Fair value	47,901
Due after five years through ten years, Fair Value	63,750
Due after ten years, Fair value	259,204
Total, Fair value	$372,999

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]	'	'	'	'
Realized gross gains	'	$11,000	$247,000	$767,000
Realized gross losses	10,000	'	21,000	18,000
Proceeds from the sale of investment securities	$100	$23,000	$8,100,000	$39,200,000

Unrealized_Losses_on_Securitie2

Unrealized Losses on Securities - Schedule of Gross Unrealized Losses and Fair Value (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified	Security	Security
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	78	82
Fair Value, Less than Twelve Months	$28,028	$139,442
Gross Unrealized Losses, Less than Twelve Months	-124	-4,247
Fair Value, Twelve Months or Greater	105,886	2,056
Gross Unrealized Losses, Twelve Months or Greater	-3,011	-7
Fair Value, Total	133,914	141,498
Gross Unrealized Losses, Total	-3,135	-4,254
Fannie Mae [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	24	30
Fair Value, Less than Twelve Months	6,381	47,814
Gross Unrealized Losses, Less than Twelve Months	-28	-1,589
Fair Value, Twelve Months or Greater	33,971	1,057
Gross Unrealized Losses, Twelve Months or Greater	-1,202	-6
Fair Value, Total	40,352	48,871
Gross Unrealized Losses, Total	-1,230	-1,595
Freddie Mac [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	23	20
Fair Value, Less than Twelve Months	9,551	32,781
Gross Unrealized Losses, Less than Twelve Months	-49	-1,252
Fair Value, Twelve Months or Greater	30,409	'
Gross Unrealized Losses, Twelve Months or Greater	-968	'
Fair Value, Total	39,960	32,781
Gross Unrealized Losses, Total	-1,017	-1,252
Governmental National Mortgage Association [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	6	6
Fair Value, Less than Twelve Months	3,453	10,301
Gross Unrealized Losses, Less than Twelve Months	-11	-230
Fair Value, Twelve Months or Greater	6,245	'
Gross Unrealized Losses, Twelve Months or Greater	-159	'
Fair Value, Total	9,698	10,301
Gross Unrealized Losses, Total	-170	-230
Other Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	3	3
Fair Value, Less than Twelve Months	547	3,366
Gross Unrealized Losses, Less than Twelve Months	-1	-19
Fair Value, Twelve Months or Greater	2,286	'
Gross Unrealized Losses, Twelve Months or Greater	-6	'
Fair Value, Total	2,833	3,366
Gross Unrealized Losses, Total	-7	-19
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	5	7
Fair Value, Less than Twelve Months	'	8,064
Gross Unrealized Losses, Less than Twelve Months	'	-499
Fair Value, Twelve Months or Greater	7,186	'
Gross Unrealized Losses, Twelve Months or Greater	-294	'
Fair Value, Total	7,186	8,064
Gross Unrealized Losses, Total	-294	-499
U.S. Government Agency Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	10	10
Fair Value, Less than Twelve Months	4,004	30,084
Gross Unrealized Losses, Less than Twelve Months	-6	-479
Fair Value, Twelve Months or Greater	23,470	999
Gross Unrealized Losses, Twelve Months or Greater	-366	-1
Fair Value, Total	27,474	31,083
Gross Unrealized Losses, Total	-372	-480
Corporate Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	5	5
Fair Value, Less than Twelve Months	1,990	5,042
Gross Unrealized Losses, Less than Twelve Months	-10	-169
Fair Value, Twelve Months or Greater	2,319	'
Gross Unrealized Losses, Twelve Months or Greater	-16	'
Fair Value, Total	4,309	5,042
Gross Unrealized Losses, Total	-26	-169
Other Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	2	'
Fair Value, Less than Twelve Months	2,102	'
Gross Unrealized Losses, Less than Twelve Months	-19	'
Fair Value, Total	2,102	'
Gross Unrealized Losses, Total	-19	'
Equity Securities-Financial Services [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Number of Securities	'	1
Fair Value, Less than Twelve Months	'	1,990
Gross Unrealized Losses, Less than Twelve Months	'	-10
Fair Value, Total	'	1,990
Gross Unrealized Losses, Total	'	($10)

Loans_Receivable_Net_and_Allow2

Loans Receivable, Net and Allowance for Loan Losses - Summary of Loans Receivable (Detail) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Apr. 01, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Real Estate Loans:	'	'	'	'	'	'
Total Loans	$1,058,961	'	$936,294	'	'	'
Less allowance for loan losses	8,836	8,662	8,064	8,184	7,671	7,302
Net loans	1,050,125	'	928,230	'	'	'
First National Community Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	1,030	'	'	'	'	'
Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	152,188	'	'	'	'	'
Residential Real Estate Loans [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	667,316	'	686,651	'	'	'
Less allowance for loan losses	5,934	5,920	5,787	5,967	5,791	5,401
Residential Real Estate Loans [Member] | First National Community Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	933	'	'	'	'	'
Residential Real Estate Loans [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	17,151	'	'	'	'	'
Construction Real Estate Loans [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	1,800	'	2,288	'	'	'
Less allowance for loan losses	24	26	20	44	28	29
Commercial Real Estate Loans [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	188,343	'	159,469	'	'	'
Less allowance for loan losses	581	1,003	946	1,025	837	699
Commercial Real Estate Loans [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	38,247	'	'	'	'	'
Commercial Loans [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	23,331	'	10,125	'	'	'
Less allowance for loan losses	593	369	337	361	350	474
Commercial Loans [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	9,308	'	'	'	'	'
Obligations of States and Political Subdivisions [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	50,096	'	33,445	'	'	'
Less allowance for loan losses	116	106	130	113	106	127
Obligations of States and Political Subdivisions [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	7,309	'	'	'	'	'
Home Equity Loans and Lines of Credit [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	40,866	'	41,923	'	'	'
Less allowance for loan losses	473	500	430	596	496	499
Home Equity Loans and Lines of Credit [Member] | First National Community Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	77	'	'	'	'	'
Home Equity Loans and Lines of Credit [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	16	'	'	'	'	'
Auto Loans [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	83,619	'	61	'	'	'
Less allowance for loan losses	56	'	'	'	'	'
Auto Loans [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	78,794	'	'	'	'	'
Other [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Total Loans	3,590	'	2,332	'	'	'
Less allowance for loan losses	26	26	21	20	19	22
Other [Member] | First National Community Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	20	'	'	'	'	'
Other [Member] | Franklin Security Bank [Member]	'	'	'	'	'	'
Real Estate Loans:	'	'	'	'	'	'
Home equity loans and lines of credit	$1,363	'	'	'	'	'

Loans_Receivable_Net_and_Allow3

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Loans Evaluated for Impairment (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	$1,058,961	$936,294
Individually Evaluated for Impairment	31,761	30,095
Loans Acquired with Deteriorated Credit Quality	5,553	7,131
Collectively Evaluated for Impairment	1,021,647	899,068
Residential Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	667,316	686,651
Individually Evaluated for Impairment	13,093	14,018
Loans Acquired with Deteriorated Credit Quality	109	271
Collectively Evaluated for Impairment	654,114	672,362
Construction Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	1,800	2,288
Collectively Evaluated for Impairment	1,800	2,288
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	188,343	159,469
Individually Evaluated for Impairment	17,912	15,478
Loans Acquired with Deteriorated Credit Quality	5,151	6,355
Collectively Evaluated for Impairment	165,280	137,636
Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	23,331	10,125
Individually Evaluated for Impairment	536	220
Loans Acquired with Deteriorated Credit Quality	293	502
Collectively Evaluated for Impairment	22,502	9,403
Obligations of States and Political Subdivisions [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	50,096	33,445
Collectively Evaluated for Impairment	50,096	33,445
Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	40,866	41,923
Individually Evaluated for Impairment	220	379
Loans Acquired with Deteriorated Credit Quality	'	3
Collectively Evaluated for Impairment	40,646	41,541
Auto Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	83,619	61
Collectively Evaluated for Impairment	83,619	61
Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Loans	3,590	2,332
Collectively Evaluated for Impairment	$3,590	$2,332

Loans_Receivable_Net_and_Allow4

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Investment and Unpaid Principal Balances for Impaired Loans (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	$37,314	$37,226
Unpaid Principal Balance	41,250	41,084
Associated Allowance	664	819
Average Recorded Investment	37,194	37,386
Interest Income Recognized	927	860
With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	31,776	31,066
Unpaid Principal Balance	35,100	34,685
Average Recorded Investment	31,856	31,892
Interest Income Recognized	848	786
With an Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	5,538	6,160
Unpaid Principal Balance	6,150	6,399
Associated Allowance	664	819
Average Recorded Investment	5,338	5,494
Interest Income Recognized	79	74
Residential Real Estate Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	13,202	14,289
Unpaid Principal Balance	15,861	16,234
Associated Allowance	531	518
Average Recorded Investment	12,991	12,371
Interest Income Recognized	321	233
Residential Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	8,512	11,251
Unpaid Principal Balance	10,603	13,013
Average Recorded Investment	9,566	9,716
Interest Income Recognized	242	159
Residential Real Estate Loans [Member] | With an Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	4,690	3,038
Unpaid Principal Balance	5,258	3,221
Associated Allowance	531	518
Average Recorded Investment	3,425	2,655
Interest Income Recognized	79	74
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	23,063	21,833
Unpaid Principal Balance	24,052	23,436
Associated Allowance	96	301
Average Recorded Investment	22,137	23,590
Interest Income Recognized	553	615
Commercial Real Estate Loans [Member] | With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	22,252	18,711
Unpaid Principal Balance	23,205	20,258
Average Recorded Investment	20,241	20,751
Interest Income Recognized	553	615
Commercial Real Estate Loans [Member] | With an Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	811	3,122
Unpaid Principal Balance	847	3,178
Associated Allowance	96	301
Average Recorded Investment	1,896	2,839
Commercial Loans [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	829	722
Unpaid Principal Balance	834	731
Average Recorded Investment	1,764	1,034
Interest Income Recognized	49	9
Commercial Loans [Member] | With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	829	722
Unpaid Principal Balance	834	731
Average Recorded Investment	1,764	1,034
Interest Income Recognized	49	9
Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	220	382
Unpaid Principal Balance	503	683
Associated Allowance	37	'
Average Recorded Investment	302	373
Interest Income Recognized	4	3
Home Equity Loans and Lines of Credit [Member] | With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	183	382
Unpaid Principal Balance	458	683
Average Recorded Investment	285	373
Interest Income Recognized	4	3
Home Equity Loans and Lines of Credit [Member] | With an Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment	37	'
Unpaid Principal Balance	45	'
Associated Allowance	37	'
Average Recorded Investment	17	'
Other [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Average Recorded Investment	'	18
Other [Member] | With no Specific Allowance Recorded [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Average Recorded Investment	'	$18

Loans_Receivable_Net_and_Allow5

Loans Receivable, Net and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Receivables [Abstract]	'	'	'	'
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	$250,000	'	$250,000	'
Minimum external review amount	500,000	'	500,000	'
Troubled debt restructurings granted terms concession	28,000	336,000	607,000	410,000
Troubled debt restructurings granted terms and rate concession	208,000	751,000	883,000	1,300,000
Troubled debt restructurings that have subsequently defaulted within one year of modification	$0	$0	$0	$0

Loans_Receivable_Net_and_Allow6

Loans Receivable, Net and Allowance for Loan Losses - Classes of Loan Portfolio, Internal Risk Rating System (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	$261,770	$203,039
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	188,343	159,469
Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	23,331	10,125
Obligations of States and Political Subdivisions [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	50,096	33,445
Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	229,750	172,710
Pass [Member] | Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	157,359	129,799
Pass [Member] | Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	22,295	9,466
Pass [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	50,096	33,445
Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	8,951	9,876
Special Mention [Member] | Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	8,576	9,440
Special Mention [Member] | Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	375	436
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	22,767	20,453
Substandard [Member] | Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	22,106	20,230
Substandard [Member] | Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	661	223
Doubtful [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	302	'
Doubtful [Member] | Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Loan, total	$302	'

Loans_Receivable_Net_and_Allow7

Loans Receivable, Net and Allowance for Loan Losses - Schedule of Performing or Non-Performing Loans (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	$797,191	$733,255
Residential Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	667,316	686,651
Construction Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	1,800	2,288
Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	40,866	41,923
Auto Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	83,619	61
Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	3,590	2,332
Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	786,477	721,971
Performing [Member] | Residential Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	656,893	675,706
Performing [Member] | Construction Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	1,800	2,288
Performing [Member] | Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	40,613	41,584
Performing [Member] | Auto Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	83,594	61
Performing [Member] | Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	3,577	2,332
Non-Performing [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	10,714	11,284
Non-Performing [Member] | Residential Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	10,423	10,945
Non-Performing [Member] | Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	253	339
Non-Performing [Member] | Auto Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	25	'
Non-Performing [Member] | Other [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total	$13	'

Loans_Receivable_Net_and_Allow8

Loans Receivable, Net and Allowance for Loan Losses - Classes of the Loan Portfolio Summarized by the Aging Categories (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	$1,030,311	$906,309
31-60 Days Past Due	4,765	5,639
61-90 Days Past Due	955	1,067
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	22,930	23,279
Total Past Due and Non-Accrual	28,650	29,985
Total Loans	1,058,961	936,294
Residential Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	652,247	671,850
31-60 Days Past Due	3,857	2,866
61-90 Days Past Due	789	990
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	10,423	10,945
Total Past Due and Non-Accrual	15,069	14,801
Total Loans	667,316	686,651
Construction Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	1,800	2,288
Greater than 90 Days Past Due and still accruing	'	'
Total Loans	1,800	2,288
Commercial Real Estate Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	177,162	146,062
31-60 Days Past Due	283	2,589
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	10,898	10,818
Total Past Due and Non-Accrual	11,181	13,407
Total Loans	188,343	159,469
Commercial Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	21,682	8,948
31-60 Days Past Due	204	'
61-90 Days Past Due	127	'
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	1,318	1,177
Total Past Due and Non-Accrual	1,649	1,177
Total Loans	23,331	10,125
Obligations of States and Political Subdivisions [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	50,077	33,445
31-60 Days Past Due	19	'
Greater than 90 Days Past Due and still accruing	'	'
Total Past Due and Non-Accrual	19	'
Total Loans	50,096	33,445
Home Equity Loans and Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	40,514	41,380
31-60 Days Past Due	69	127
61-90 Days Past Due	30	77
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	253	339
Total Past Due and Non-Accrual	352	543
Total Loans	40,866	41,923
Auto Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	83,312	61
31-60 Days Past Due	282	'
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	25	'
Total Past Due and Non-Accrual	307	'
Total Loans	83,619	61
Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Current	3,517	2,275
31-60 Days Past Due	51	57
61-90 Days Past Due	9	'
Greater than 90 Days Past Due and still accruing	'	'
Non-Accrual	13	'
Total Past Due and Non-Accrual	73	57
Total Loans	$3,590	$2,332

Loans_Receivable_Net_and_Allow9

Loans Receivable, Net and Allowance for Loan Losses - Summary of Primary Segments of ALL (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	$8,662	$7,671	$8,064	$7,302	'
Charge-offs	-365	-599	-1,449	-2,129	'
Recoveries	39	12	221	61	'
Provision	500	1,100	2,000	2,950	'
Balance, End of period	8,836	8,184	8,836	8,184	'
Individually evaluated for impairment	664	'	664	'	819
Collectively evaluated for impairment	8,172	'	8,172	'	7,245
Balance, End of period	8,836	8,184	8,836	8,184	'
Residential Real Estate Loans [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	5,920	5,791	5,787	5,401	'
Charge-offs	-332	-509	-1,255	-1,752	'
Recoveries	34	9	112	50	'
Provision	312	676	1,290	2,268	'
Balance, End of period	5,934	5,967	5,934	5,967	'
Individually evaluated for impairment	531	'	531	'	518
Collectively evaluated for impairment	5,403	'	5,403	'	5,269
Balance, End of period	5,934	5,967	5,934	5,967	'
Construction Real Estate Loans [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	26	28	20	29	'
Provision	-2	16	4	15	'
Balance, End of period	24	44	24	44	'
Collectively evaluated for impairment	24	'	24	'	20
Balance, End of period	24	44	24	44	'
Commercial Real Estate Loans [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	1,003	837	946	699	'
Charge-offs	-23	-74	-73	-288	'
Recoveries	'	'	83	2	'
Provision	-399	262	-375	612	'
Balance, End of period	581	1,025	581	1,025	'
Individually evaluated for impairment	96	'	96	'	301
Collectively evaluated for impairment	485	'	485	'	645
Balance, End of period	581	1,025	581	1,025	'
Commercial Loans [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	369	350	337	474	'
Charge-offs	'	-16	-48	-16	'
Recoveries	2	'	14	'	'
Provision	222	27	290	-97	'
Balance, End of period	593	361	593	361	'
Collectively evaluated for impairment	593	'	593	'	337
Balance, End of period	593	361	593	361	'
Obligations of States and Political Subdivisions [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	106	106	130	127	'
Provision	10	7	-14	-14	'
Balance, End of period	116	113	116	113	'
Collectively evaluated for impairment	116	'	116	'	130
Balance, End of period	116	113	116	113	'
Home Equity Loans and Lines of Credit [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	500	496	430	499	'
Charge-offs	-10	'	-73	-67	'
Recoveries	'	3	'	9	'
Provision	-17	97	116	155	'
Balance, End of period	473	596	473	596	'
Individually evaluated for impairment	37	'	37	'	'
Collectively evaluated for impairment	436	'	436	'	430
Balance, End of period	473	596	473	596	'
Auto Loans [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Provision	56	'	56	'	'
Balance, End of period	56	'	56	'	'
Collectively evaluated for impairment	56	'	56	'	'
Balance, End of period	56	'	56	'	'
Other [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	26	19	21	22	'
Charge-offs	'	'	'	-6	'
Recoveries	3	'	12	'	'
Provision	-3	1	-7	4	'
Balance, End of period	26	20	26	20	'
Collectively evaluated for impairment	26	'	26	'	21
Balance, End of period	26	20	26	20	'
Unallocated [Member]	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'
Balance, Beginning of period	712	44	393	51	'
Provision	321	14	640	7	'
Balance, End of period	1,033	58	1,033	58	'
Collectively evaluated for impairment	1,033	'	1,033	'	393
Balance, End of period	$1,033	$58	$1,033	$58	'

Recovered_Sheet1

Loans Receivable, Net and Allowance for Loan Losses - Summary of Troubled Debt Restructuring Granted (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Contract	Contract	Contract	Contract
Real Estate Loans [Member] | Residential [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	2	8	9	12
Pre-Modification Outstanding Recorded Investment	$236	$989	$1,293	$1,589
Post-Modification Outstanding Recorded Investment	236	989	1,293	1,589
Real Estate Loans [Member] | Commercial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	1	'
Pre-Modification Outstanding Recorded Investment	'	'	197	'
Post-Modification Outstanding Recorded Investment	'	'	197	'
Home Equity Loans and Lines of Credit [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	1	'	1
Pre-Modification Outstanding Recorded Investment	'	98	'	98
Post-Modification Outstanding Recorded Investment	'	98	'	98
Troubled Debt Restructurings [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	2	9	10	13
Pre-Modification Outstanding Recorded Investment	236	1,087	1,490	1,687
Post-Modification Outstanding Recorded Investment	$236	$1,087	$1,490	$1,687

Deposits_Schedule_of_Deposits_

Deposits - Schedule of Deposits by Major Classifications (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Banking And Thrift [Abstract]	'	'
Non-interest bearing demand accounts	$70,980	$58,795
NOW accounts	120,939	99,857
Money market accounts	178,263	138,049
Savings and club accounts	124,812	110,189
Certificates of deposit	648,101	634,169
Total	$1,143,095	$1,041,059

Net_Periodic_Benefit_CostDefin2

Net Periodic Benefit Cost-Defined Benefit Plan - Components of Net Periodic Benefit Cost (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'	'	'	'
Service Cost	$144	$175	$433	$526
Interest Cost	191	179	572	537
Expected return on plan assets	-290	-259	-871	-776
Amortization of unrecognized loss	7	98	21	294
Net periodic benefit cost	$52	$193	$155	$581

Net_Periodic_Benefit_CostDefin3

Net Periodic Benefit Cost-Defined Benefit Plan - Additional Information (Detail) (USD $)	1 Months Ended
	31-May-14
Compensation And Retirement Disclosure [Abstract]	'
Contribution of bank	$550,000

Equity_Incentive_Plan_Addition

Equity Incentive Plan - Additional Information (Detail) (USD $)	9 Months Ended			9 Months Ended	0 Months Ended		9 Months Ended	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014	Apr. 01, 2013	23-May-08	Jun. 30, 2014	23-May-08	23-May-08
			Equity Incentive Plan [Member]	Stock Option [Member]	Restricted Stock [Member]	Restricted Stock [Member]	Restricted Stock [Member]	Non Qualified Stock Option [Member]	Incentive Stock Option [Member]
Compensation Related Costs Disclosure [Line Items]	'	'	'	'	'	'	'	'	'
Common stock issuance, grant	'	'	2,377,326	'	'	'	'	'	'
Number of available shares	'	'	'	1,698,090	'	'	679,236	'	'
Shares granted	'	'	'	'	'	590,320	'	1,140,469	317,910
Number of shares of restricted stock granted to officers	0	'	'	'	30,000	'	'	'	'
Option vesting period (in years)	'5 years	'	'	'	'	'	'	'	'
Option expiration date (in years)	'10 years	'	'	'	'	'	'	'	'
Restricted shares vesting period	'5 years	'	'	'	'	'	'18 months	'	'
Share-based compensation expense	$170,000	$1,461,000	'	'	'	'	'	'	'
Restricted stock expense	170,000	1,000,000	'	'	'	'	'	'	'
Stock option expense	'	458,000	'	'	'	'	'	'	'
Outstanding nonvested restricted stock	'	'	'	'	'	'	13,334	'	'
Expected future expense	'	'	'	'	'	'	$49,000	'	'
Remaining vesting period	'	'	'	'	'	'	'3 months	'	'

Equity_Incentive_Plan_Schedule

Equity Incentive Plan - Schedule of Stock Option Activity (Detail) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'
Number of Stock Options, Outstanding, Beginning Balance	1,458,379	'
Number of Stock Options, Granted	0	'
Number of Stock Options, Exercised	0	'
Number of Stock Options, Forfeited	0	'
Number of Stock Options, Outstanding, Ending Balance	1,458,379	'
Number of Stock Options, Exercisable , Ending Balance	1,458,379	'
Weighted-average Exercise Price, Outstanding, Beginning Balance	$12.35	'
Weighted-average Exercise Price, Granted	$0	'
Weighted-average Exercise Price, Exercised	$0	'
Weighted-average Exercise Price, Forfeited	$0	'
Weighted-average Exercise Price, Outstanding, Ending Balance	$12.35	'
Weighted-average Exercise Price, Exercisable, Ending Balance	$12.35	'
Weighted-average Remaining Contractual Term (in years), Outstanding	'3 years 10 months 24 days	'4 years 8 months 1 day
Weighted-average Remaining Contractual Term (in years), Exercisable, Ending Balance	'3 years 10 months 24 days	'
Aggregate Intrinsic Value, Outstanding, Beginning Balance	'	'
Aggregate Intrinsic Value, Granted	'	'
Aggregate Intrinsic Value, Exercised	'	'
Aggregate Intrinsic Value, Forfeited	'	'
Aggregate Intrinsic Value, Outstanding, Ending Balance	'	'
Aggregate Intrinsic Value, Exercisable at year-end	'	'

Equity_Incentive_Plan_Schedule1

Equity Incentive Plan - Schedule of Restricted Stock Option Activity (Detail) (USD $)	0 Months Ended	9 Months Ended
	Apr. 01, 2013	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Restricted Stock, Granted	'	0
Number of Restricted Stock, Forfeited	'	0
Weighted-average Grant Date Fair Value, Forfeited	'	$0
Restricted Stock [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Restricted Stock, Nonvested, Beginning balance	'	14,995
Number of Restricted Stock, Granted	30,000	'
Number of Restricted Stock, Vested	'	1,661
Number of Restricted Stock, Forfeited	'	'
Number of Restricted Stock, Nonvested, Ending balance	'	13,334
Weighted-average Grant Date Fair Value, Nonvested, Beginning balance	'	$10.94
Weighted-average Grant Date Fair Value, Granted	'	'
Weighted-average Grant Date Fair Value, Vested	'	$10.94
Weighted-average Grant Date Fair Value, Forfeited	'	'
Weighted-average Grant Date Fair Value, Nonvested, Ending balance	'	$10.94

Fair_Value_Measurement_Schedul

Fair Value Measurement - Schedule of Securities, Other Real Estate Owned and Impaired Loans Measured at Fair Value (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	$375,024	$315,622
Foreclosed real estate owned measured on a non-recurring basis	2,967	2,111
Impaired loans measured on a non-recurring basis	36,650	36,407
Total Mortgage-Backed Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	257,581	217,837
Obligations of States and Political Subdivisions [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	43,163	23,909
U.S. Government Agency Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	47,905	52,520
Corporate Obligations [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	13,405	12,773
Trust-Preferred Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	5,691	5,414
Other Debt Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	5,254	1,154
Equity Securities-Financial Services [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	2,025	2,015
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	2,025	2,015
Foreclosed real estate owned measured on a non-recurring basis	'	'
Impaired loans measured on a non-recurring basis	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Total Mortgage-Backed Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agency Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Obligations [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trust-Preferred Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Debt Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities-Financial Services [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	2,025	2,015
Significant Other Observable Inputs (Level 2) [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	371,169	311,807
Foreclosed real estate owned measured on a non-recurring basis	'	'
Impaired loans measured on a non-recurring basis	'	'
Significant Other Observable Inputs (Level 2) [Member] | Total Mortgage-Backed Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	257,581	217,837
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	43,163	23,909
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	47,905	52,520
Significant Other Observable Inputs (Level 2) [Member] | Corporate Obligations [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	13,405	12,773
Significant Other Observable Inputs (Level 2) [Member] | Trust-Preferred Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	3,861	3,614
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	5,254	1,154
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities-Financial Services [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	1,830	1,800
Foreclosed real estate owned measured on a non-recurring basis	2,967	2,111
Impaired loans measured on a non-recurring basis	36,650	36,407
Significant Unobservable Inputs (Level 3) [Member] | Total Mortgage-Backed Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Agency Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Obligations [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Significant Unobservable Inputs (Level 3) [Member] | Trust-Preferred Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	1,830	1,800
Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	0
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities-Financial Services [Member]	'	'
Securities available-for-sale measured on a recurring basis	'	'
Total debt and equity securities	'	$0

Fair_Value_Measurement_Schedul1

Fair Value Measurement - Schedule of Changes in Fair Value of Level III Investments (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Significant Unobservable Inputs (Level 3) [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Beginning balance	$1,830	$1,760	$1,800	$1,740
Purchases, sales, issuances, settlements, net	'	'	'	'
Total unrealized gain:	'	'	'	'
Included in earnings	'	'	'	'
Included in other comprehensive income	'	20	30	40
Transfers in and/or out of Level III	'	'	'	'
Ending balance	$1,830	$1,780	$1,830	$1,780

Fair_Value_Measurement_Additio

Fair Value Measurement - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2014	Sep. 30, 2013
	Loans	Loans
Fair Value Disclosures [Abstract]	'	'
Number of impaired loans	249	233
Impaired loans, carrying value	$37,300,000	$37,200,000
Impaired loans, valuation allowance	664,000	819,000
Impaired loans, net fair value	$36,700,000	$36,400,000

Fair_Value_Measurement_Summary

Fair Value Measurement - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Impaired Loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair Value Estimate	$36,650	$36,407
Unobservable Input	'Appraisal adjustments	'Appraisal adjustments
Fair value input appraisal adjustments	23.00%	23.50%
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	30.00%	30.00%
Foreclosed Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair Value Estimate	$2,967	$2,111
Unobservable Input	'Appraisal adjustments	'Appraisal adjustments
Fair value input appraisal adjustments	21.40%	20.40%
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%	0.00%
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	40.00%	0.00%
Appraisal of Collateral [Member] | Impaired Loans [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Valuation Techniques	'Appraisal of collateral	'Appraisal of collateral
Appraisal of Collateral [Member] | Foreclosed Real Estate Owned [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Valuation Techniques	'Appraisal of collateral	'Appraisal of collateral

Fair_Value_Measurement_Schedul2

Fair Value Measurement - Schedule of Estimate of Fair Value Using Methodologies (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Financial assets:	'	'
Cash and cash equivalents	$23,480	$26,648
Certificates of deposit	1,767	1,767
Investment and mortgage backed securities available for sale	375,024	315,622
Loans receivable, net	1,078,683	951,120
Accrued interest receivable	5,042	4,413
FHLB stock	12,757	9,415
Mortgage servicing rights	799	382
Bank owned life insurance	29,484	28,797
Financial liabilities:	'	'
Deposits	1,146,902	1,045,400
Short-term borrowings	78,749	23,000
Other borrowings	146,398	124,504
Advances by borrowers for taxes and insurance	11,924	4,962
Accrued interest payable	1,035	833
Carrying Value [Member]	'	'
Financial assets:	'	'
Cash and cash equivalents	23,480	26,648
Certificates of deposit	1,767	1,767
Investment and mortgage backed securities available for sale	375,024	315,622
Loans receivable, net	1,050,125	928,230
Accrued interest receivable	5,042	4,413
FHLB stock	12,757	9,415
Mortgage servicing rights	799	382
Bank owned life insurance	29,484	28,797
Financial liabilities:	'	'
Deposits	1,143,095	1,041,059
Short-term borrowings	78,749	23,000
Other borrowings	145,260	129,260
Advances by borrowers for taxes and insurance	11,924	4,962
Accrued interest payable	1,035	833
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Financial assets:	'	'
Cash and cash equivalents	23,480	26,648
Certificates of deposit	'	'
Investment and mortgage backed securities available for sale	2,025	2,015
Loans receivable, net	'	'
Accrued interest receivable	5,042	4,413
FHLB stock	12,757	9,415
Mortgage servicing rights	'	'
Bank owned life insurance	29,484	28,797
Financial liabilities:	'	'
Deposits	494,994	406,890
Short-term borrowings	78,749	23,000
Other borrowings	'	'
Advances by borrowers for taxes and insurance	11,924	4,962
Accrued interest payable	1,035	833
Significant Other Observable Inputs (Level 2) [Member]	'	'
Financial assets:	'	'
Cash and cash equivalents	'	'
Certificates of deposit	1,767	1,767
Investment and mortgage backed securities available for sale	371,169	311,807
Loans receivable, net	'	'
Accrued interest receivable	'	'
FHLB stock	'	'
Mortgage servicing rights	'	'
Bank owned life insurance	'	'
Financial liabilities:	'	'
Deposits	'	'
Short-term borrowings	'	'
Other borrowings	'	'
Advances by borrowers for taxes and insurance	'	'
Accrued interest payable	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Financial assets:	'	'
Cash and cash equivalents	'	'
Certificates of deposit	'	'
Investment and mortgage backed securities available for sale	1,830	1,800
Loans receivable, net	1,078,683	951,120
Accrued interest receivable	'	'
FHLB stock	'	'
Mortgage servicing rights	799	382
Bank owned life insurance	'	'
Financial liabilities:	'	'
Deposits	651,908	638,510
Short-term borrowings	0	'
Other borrowings	146,398	124,504
Advances by borrowers for taxes and insurance	'	'
Accrued interest payable	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Beginning balance, Accumulated Other Comprehensive Income/(Loss)	($1,846)	$163	($1,235)	$1,758
Other comprehensive income (loss) before reclassifications	2,165	-4,194	1,701	-5,431
Amounts reclassified from accumulated other comprehensive income	12	58	-135	-300
Period change	2,177	-4,136	1,566	-5,731
Ending balance, Accumulated Other Comprehensive Income/(Loss)	331	-3,973	331	-3,973
Provision for income taxes	976	519	2,146	2,542
Defined Benefit Pension Plan [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Beginning balance, Accumulated Other Comprehensive Income/(Loss)	-1,297	-4,318	-1,306	-4,450
Amounts reclassified from accumulated other comprehensive income	5	65	14	194
Period change	5	65	14	194
Ending balance, Accumulated Other Comprehensive Income/(Loss)	-1,292	-4,253	-1,292	-4,253
Unrealized Gains (Losses) on Securities Available for Sale [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Beginning balance, Accumulated Other Comprehensive Income/(Loss)	-549	4,481	71	6,208
Other comprehensive income (loss) before reclassifications	2,165	-4,194	1,701	-5,431
Amounts reclassified from accumulated other comprehensive income	7	-7	-149	-494
Period change	2,172	-4,201	1,552	-5,925
Ending balance, Accumulated Other Comprehensive Income/(Loss)	1,623	280	1,623	280
Reclassification Out of Accumulated Other Comprehensive Income [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Net of tax	12	58	-135	-300
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plan [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Compensation and employee benefits	7	98	21	294
Provision for income taxes	-2	-33	-7	-100
Net of tax	5	65	14	194
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Securities Available for Sale [Member]	'	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'	'
Gain on sale of investments, net	10	-11	-226	-749
Provision for income taxes	-3	4	77	255
Net of tax	$7	($7)	($149)	($494)

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended
	Jun. 30, 2014
	Branch
Business Acquisition [Line Items]	'
Number of branches acquired	2
Loan portfolio without evidence of deterioration	$155,300,000
Fair value of loan portfolio	152,200,000
Franklin Security Bancorp, Inc. [Member]	'
Business Acquisition [Line Items]	'
Date of acquisition	4-Apr-14
Total purchase price related to acquisition	15,698,000
FNCB Branch [Member]	'
Business Acquisition [Line Items]	'
Date of acquisition	24-Jan-14
Number of branches acquired	1
Total purchase price related to acquisition	4,460,000
Loan portfolio without evidence of deterioration	1,000,000
Fair value of loan portfolio	$1,000,000

Acquisitions_Condensed_Stateme

Acquisitions - Condensed Statement Reflecting Values Assigned to Net Assets (Detail) (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Net assets acquired:	'	'
Goodwill resulting from FNCB purchase	$10,259	$8,817
Franklin Security Bancorp, Inc. [Member]	'	'
Business Acquisition [Line Items]	'	'
Total purchase price	15,698	'
Net assets acquired:	'	'
Cash	-19,825	'
Investments available for sale	55,901	'
Loans receivable	152,188	'
Regulatory stock	1,569	'
Premises and equipment, net	176	'
Foreclosed real estate	436	'
Intangible assets	889	'
Deferred tax assets	1,031	'
Other assets	2,504	'
Certificates of deposits	-90,869	'
Deposits other than certificates of deposits	-71,317	'
Borrowings	-30,177	'
Other liabilities	-2,265	'
Gain resulting from Franklin Security Bancorp, Inc. acquisition	241	'
FNCB Branch [Member]	'	'
Business Acquisition [Line Items]	'	'
Total purchase price	4,460	'
Net assets acquired:	'	'
Cash	11	'
Loans receivable	1,033	'
Premises and equipment, net	1,626	'
Certificates of deposits	-3,069	'
Deposits other than certificates of deposits	-5,683	'
Gain resulting from Franklin Security Bancorp, Inc. acquisition	6,082	'
Goodwill resulting from FNCB purchase	$1,442	'

Acquisitions_Financial_Informa

Acquisitions - Financial Information Regarding Former First Star Operations Included in Consolidated Statement of Income (Detail) (Franklin Security Bancorp, Inc. [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Acquisition [Line Items]	'	'	'	'
Net interest income	$11,097	$11,267	$32,534	$34,791
Noninterest income	2,100	1,915	5,605	6,850
Net Income	2,385	2,036	4,471	7,184
Pro forma earnings per share	'	'	'	'
Basic	$0.22	$0.18	$0.41	$0.61
Diluted	$0.22	$0.18	$0.41	$0.61
Actual From Acquisition Date Through June 30, 2014 [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Net interest income	'	'	1,902	'
Noninterest income	'	'	107	'
Net Income	'	'	$641	'