Fairmount Bancorp (FMTB) 10-K 23 Dec 13 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2013	Dec. 23, 2013	Mar. 31, 2013
Document Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Sep-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'FMTB	'	'
Entity Registrant Name	'FAIRMOUNT BANCORP, INC.	'	'
Entity Central Index Key	'0001477968	'	'
Current Fiscal Year End Date	'--09-30	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'Yes	'	'
Entity Filer Category	'Smaller Reporting Company	'	'
Entity Common Stock, Shares Outstanding	'	484,839	'
Entity Public Float	'	'	$8,400,000

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Sep. 30, 2012
Assets	'	'
Cash and due from banks	$850,941	$513,787
Interest-bearing deposits in other banks	858,746	337,379
Federal funds sold	2,141,774	3,512,020
Cash and cash equivalents	3,851,461	4,363,186
Certificates of deposit	3,783,568	3,531,991
Securities available for sale, at fair value	5,791,725	7,803,575
Securities held to maturity, at amortized cost	3,756,238	3,636,972
Federal Home Loan Bank stock, at cost	453,700	479,700
Loans, net of allowances for loan and lease losses of $733,451 at September 30, 2013 and $617,474 at September 30, 2012	55,375,365	54,650,111
Accrued interest receivable	233,680	290,304
Premises and equipment, net	3,155,062	3,236,995
Foreclosed assets	20,000	295,750
Cash surrender value of life insurance	'	70,736
Deferred income tax assets	287,746	211,099
Prepaid expenses and other assets	319,604	473,334
Total assets	77,028,149	79,043,753
Deposits	'	'
Noninterest-bearing deposits	561,563	780,336
Interest-bearing deposits	4,075,532	4,355,762
Savings deposits	16,850,314	15,461,977
Certificates of deposit	34,442,370	37,427,659
Total deposits	55,929,779	58,025,734
Federal Home Loan Bank advances	8,000,000	8,000,000
Accrued interest payable	42,503	42,962
Deferred compensation liability	'	8,170
Accounts payable and other liabilities	52,638	111,697
Total liabilities	64,024,920	66,188,563
Commitments and contingencies	'	'
Stockholders' Equity	'	'
Preferred stock, $0.01 par value; authorized 1,000,000; none issued	'	'
Common stock, $0.01 par value; authorized 4,000,000; 500,314 issued; 484,839 shares outstanding at September 30, 2013 and 2012, respectively	5,003	5,003
Additional paid in capital	4,040,748	3,979,972
Unearned common stock held by:	'	'
Employee Stock Ownership Plan	-209,736	-251,607
Recognition and Retention Plan	-245,145	-162,271
Retained earnings	9,334,634	9,077,164
Accumulated other comprehensive income	77,725	206,929
Total stockholders' equity	13,003,229	12,855,190
Total liabilities and stockholders' equity	$77,028,149	$79,043,753

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Loans and lease losses, allowances	$733,451	$617,474
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	500,314	500,314
Common stock, shares outstanding	484,839	484,839

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Interest and dividend income:	'	'
Interest on loans	$3,147,659	$3,319,533
Interest and dividends on investments	270,823	394,831
Total interest income	3,418,482	3,714,364
Interest expense:	'	'
Interest on deposits	465,117	646,636
Interest on borrowings	268,016	273,451
Total interest expense	733,133	920,087
Net interest income	2,685,349	2,794,277
Provision for loan and lease losses	500,000	200,000
Net interest income after provision for loan and lease losses	2,185,349	2,594,277
Non-interest income:	'	'
Service fees on deposit accounts	5,269	4,957
Other service charges, commissions and fees	86,448	67,613
Gain on sale of assets	116,480	4,737
Other non-interest income	39,555	14,330
Total non-interest income	247,752	91,637
Non-interest expense:	'	'
Salaries, fees and employment	1,150,622	1,088,001
Premises and equipment	212,934	196,358
Professional fees	198,059	283,632
Data processing	127,060	114,336
FDIC premiums and regulatory assessments	104,304	97,089
Insurance and bond premiums	31,983	37,962
Stationery, printing and supplies	25,675	35,704
Provision for losses and costs on real estate acquired through foreclosure	24,747	251,630
Other operating expenses	119,520	140,483
Total non-interest expense	1,994,904	2,245,195
Income before income taxes	438,197	440,719
Income taxes	180,727	114,427
Income before extraordinary item	257,470	326,292
Extraordinary item, gain on business combination	'	1,022,074
Net income	$257,470	$1,348,366
Basic and dilutive earnings per common share:	'	'
Net income before extraordinary item, basic	$0.58	$0.69
Extraordinary item, gain on business combination, basic	'	$2.17
Net income, basic	$0.58	$2.86
Basic weighted average shares outstanding	445,643	472,278
Net income before extraordinary item, dilutive	$0.56	$0.68
Extraordinary item, gain on business combination, dilutive	'	$2.14
Net income, dilutive	$0.56	$2.82
Dilutive weighted average shares outstanding	456,782	478,719

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Net income	$257,470	$1,348,366
Other comprehensive income, net of tax:	'	'
Unrealized gain (loss) on investment securities available for sale	-329,864	8,806
Reclassification adjustment for realized gain on investment securities available for sale included in net income	-116,480	-896
Total investment securities available for sale	-213,384	7,910
Total other comprehensive income (loss), net of tax of $84,180 and $506, respectively	-129,204	7,404
Comprehensive income	$128,266	$1,355,770

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Total other comprehensive income (loss), tax	$84,180	$506

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Unearned ESOP Shares	Unearned RRP Shares	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balance at Sep. 30, 2011	$11,477,337	$4,440	$3,774,574	($230,000)	'	$7,728,798	$199,525
Net income	1,348,366	'	'	'	'	1,348,366	'
Other comprehensive income	7,404	'	'	'	'	'	7,404
Total comprehensive income	1,355,770	'	'	'	'	'	'
Issuance of common stock	452,219	563	451,656	'	'	'	'
Acquisition of unearned ESOP shares	-63,478	'	'	-63,478	'	'	'
Acquisition of unearned RRP shares	-37,168	'	'	'	-37,168	'	'
Repurchase of common stock	-389,240	'	-264,137	'	-125,103	'	'
ESOP shares released for allocation	59,750	'	17,879	41,871	'	'	'
Ending Balance at Sep. 30, 2012	12,855,190	5,003	3,979,972	-251,607	-162,271	9,077,164	206,929
Net income	257,470	'	'	'	'	257,470	'
Other comprehensive income	-129,204	'	'	'	'	'	-129,204
Total comprehensive income	128,266	'	'	'	'	'	'
Repurchase of common stock	-133,080	'	'	'	-133,080	'	'
ESOP shares released for allocation	71,676	'	29,805	41,871	'	'	'
RRP shares released for allocation	'	'	-50,206	'	50,206	'	'
Stock based compensation	81,177	'	81,177	'	'	'	'
Ending Balance at Sep. 30, 2013	$13,003,229	$5,003	$4,040,748	($209,736)	($245,145)	$9,334,634	$77,725

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$257,470	$1,348,366
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Gain on business combination	'	-1,022,074
Depreciation and amortization	132,010	123,727
Amortization and accretion of securities	88,993	53,932
Provision for loan and lease losses	500,000	200,000
Provision for loss on real estate acquired through foreclosure	'	222,000
Loss on sale of real estate acquired through foreclosure	'	18,404
(Gains) losses on sales of securities	-116,480	-896
(Gains) losses on sales of other real estate owned	23,723	-3,842
Deferred income taxes	7,533	-105,508
(Increase) decrease in accrued interest receivable	56,624	-43,716
(Increase) decrease in cash surrender value of life insurance	70,736	-1,927
(Increase) decrease in prepaid expenses and other assets	153,730	46,540
Increase (decrease) in accrued interest payable	-459	514
Increase (decrease) in accounts payable and other liabilities	-59,059	-269,424
Stock based compensation expense	81,177	'
Employee Stock Ownership Plan expense	71,676	59,750
Net cash provided (used) by operating activities	1,267,674	625,846
Cash flows from investing activities:	'	'
Cash acquired in business combination, net of merger expenses	'	4,113,398
Proceeds from sales of available for sale securities	1,753,845	189,692
Proceeds from maturities, payments and calls of available for sale securities	2,986,012	1,841,381
Proceeds from maturities, payments and calls of held to maturity securities	2,000,000	2,500,000
Purchases of available for sale securities	-1,278,086	-2,979,375
Purchases of held to maturity securities	-3,756,411	-4,499,000
(Purchases) maturities of certificates of deposit	-250,250	-3,433,991
(Purchases) redemptions of Federal Home Loan Bank stock	26,000	139,800
Net (increase) decrease in loans	-1,225,254	1,322,887
Proceeds from disposal of foreclosed real estate	272,027	347,846
Proceeds from disposal of premises and equipment	'	342,325
Purchases of premises and equipment	-70,077	-36,396
Net cash provided (used) by investing activities	457,806	-151,433
Cash flows from financing activities:	'	'
Net increase (decrease) in deposits	-2,095,955	-254,806
Net increase (decrease) in borrowings	'	-2,000,000
Payments on accrued deferred compensation obligation	-8,170	-7,780
Proceeds from issuance of common stock	'	351,573
Repurchase of common stock	-133,080	-389,240
Net cash provided (used) by financing activities	-2,237,205	-2,300,253
Net increase (decrease) in cash and cash equivalents	-511,725	-1,825,840
Cash and cash equivalents, beginning balance	4,363,186	6,189,026
Cash and cash equivalents, ending balance	3,851,461	4,363,186
Supplemental disclosure of cash flows information:	'	'
Cash paid for interest	733,592	919,573
Cash paid for income taxes	'	637,084
Supplemental schedule of noncash investing and financing activities:	'	'
Change in unrealized gain on securities available for sale - net of tax effect of $84,180 and $506, respectively	129,204	7,404
Foreclosed assets acquired in settlement of loans	$20,000	'

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Oct. 13, 2011
Change in unrealized gain on securities available for sale, tax	$84,180	$506	'
Loans to employee stock ownership plan	'	'	$63,478
Common stock acquired from employee stock ownership plan	'	'	4,502

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Sep. 30, 2013
Significant Accounting Policies	'
	Note 1.	Significant Accounting Policies
	Nature of Operations
	Fairmount Bancorp, Inc., a Maryland corporation (the “Company”) was incorporated on November 30, 2009, to serve as the holding company for Fairmount Bank (the “Bank”), a federally chartered savings bank. On June 2, 2010, in accordance with a Plan of Conversion adopted by its Board of Directors and approved by its members, the Bank converted from a federal mutual savings bank to Maryland state chartered commercial bank and become the wholly owned subsidiary of the Company. The conversion was accomplished through the sale and issuance of 444,038 shares of common stock at a price of $10.00 per share, through which the Company received proceeds of approximately $3,742,000, net of offering expenses of approximately $699,000. Approximately 50% of the net proceeds of the offering, or $1,900,000, were contributed by the Company to the Bank in return for 100% of the issued and outstanding shares of common stock of the Bank. In connection with the conversion, the Bank’s Board of Directors adopted an employee stock ownership plan (the “ESOP”) which subscribed for 8% of the sum of the number of shares, or 35,523 shares of common stock sold in the offering.
	On October 12, 2011, the Company completed the acquisition of Fullerton Federal Savings Association (“Fullerton”) in a conversion merger transaction. In connection with the acquisition and pursuant to the terms of the Agreement and Plan of Conversion Merger and the related Plan of Conversion Merger, the Company issued and sold 56,276 shares of common stock at a price of $14.10 per share, through which the Company received proceeds of approximately $452,000, net of offering expenses of $341,000. The shares were sold in a subscription offering to depositors of Fullerton and to the Company’s Employee Stock Ownership Plan and in a community offering to the Company’s Recognition and Retention Plan (the “RRP”) and to the general public. The amount of common stock offered for sale was based on an independent valuation of Fullerton.
	In accordance with the Office of the Commissioner of Financial Regulation of the State of Maryland regulations, upon the completion of the conversion, the Bank restricted retained earnings by establishing a liquidation account. The liquidation account will be maintained for the benefit of eligible account holders who continue to maintain their accounts at the Bank after conversion. The liquidation account will be reduced annually to the extent that eligible account holders have reduced their qualifying deposits. Subsequent increases will not restore an eligible account holder’s interest in the liquidation account. In the event of a complete liquidation of the Bank, and only in such event, each account holder will be entitled to receive a distribution from the liquidation account in an amount proportionate to the adjusted qualifying account balances then held. The Bank may not pay dividends if those dividends would reduce equity capital below the required liquidation account amount.
	Fairmount Bank is a community-oriented commercial bank, which provides a variety of financial services to individuals and corporate customers through its home Baltimore County, Maryland, and is subject to competition from other financial institutions. The Bank’s primary deposit products are interest-bearing savings, certificates of deposit, and individual retirement accounts. The Bank’s primary lending products are single-family residential mortgage loans. The Bank is subject to the regulations of certain Federal agencies and undergoes periodic examinations by those regulatory authorities. The accounting policies of the Bank conform to accounting principles generally accepted in the United States of America and general practices within the banking industry.
	Principles of Consolidation
	The consolidated financial statements include the accounts of Fairmount Bancorp, Inc., its wholly owned subsidiary Fairmount Bank. Material intercompany accounts and transactions have been eliminated in consolidation.
	Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for losses on loans and leases and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. In connection with the determination of the allowances for losses on loans and leases and foreclosed real estate, management obtains independent appraisals for significant properties.
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash and balances due from banks, interest-bearing deposits in other banks, certificates of deposit less than one year and federal funds sold.
	Securities
	Management determines the appropriate classification of debt securities at the time of purchase and re-evaluates such designation as of each balance sheet date.
	Securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and are reported at amortized cost (including amortization of premium or accretion of discount).
	Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time but not necessarily to maturity. Securities available for sale are carried at fair value. Unrealized gains and losses are reported as increases or decreases in other comprehensive income. Realized gains and losses, determined on the basis of the cost of the specific securities sold, are included in earnings. Premiums and discounts are recognized in interest income using a method which approximates the interest method over the terms of the securities. Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary, if any, are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, management considers (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.
	Federal Home Loan Bank Stock
	Federal Home Loan Bank of Atlanta (the “FHLB”) stock is an equity interest in the FHLB, which does not have a readily determinable fair value for purposes of Generally Accepted Accounting Standards related to Accounting for Certain Investments in Debt and Equity Securities, because its ownership is restricted and it lacks a market. FHLB stock can be sold back only at par value of $100 per share and only to the FHLB or another member institution. As of September 30, 2013 and 2012, the Company owned shares totaling $453,700 and $479,700, respectively.
	The Company evaluates the FHLB stock for impairment in accordance with generally accepted accounting principles. The Company’s determination of whether this investment is impaired is based on an assessment of the ultimate recoverability of its cost rather than by recognizing temporary declines in value. The determination of whether a decline in value affects the ultimate recoverability of its cost is influenced by criteria such as (1) the significance of the decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, and (3) the impact of legislative and regulatory changes on institutions and accordingly on the customer base of the FHLB.
	Loans
	Loans are generally carried at the amount of unpaid principal, less the allowance for loan losses and adjusted for deferred loan fees, which are amortized over the term of the loan using the interest method. Interest on loans is accrued based on the principal amounts outstanding. It is the Company’s policy to discontinue the accrual of interest when a loan is specifically determined to be impaired or when the principal or interest is delinquent for 90 days or more. When a loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest income generally is not recognized on specific impaired loans unless the likelihood of further loss is remote. Cash collections on such loans are applied as reductions of the loan principal and no interest income is recognized on those loans until the principal balance has been collected. The carrying value of impaired loans is based on the present value of the loan’s expected future cash flows or, alternatively, the observable market price of the loan or the fair value of the collateral. The loan may be returned to accrual status if unpaid principal and interest are paid so that the loan is brought current and performing according to the contractual terms of the loan.
	When a loan is 15 days past due, the Company will send the borrower a late notice. The Company also contacts the borrower by phone if the delinquency is not corrected promptly after the notice has been sent. When the loan is 30 days past due, the Company will send the borrower a letter reminding the borrower of the delinquency, and attempts to contact the borrower personally to determine the reason for the delinquency in order to ensure that the borrower understands the terms of the loan and the importance of making payments on or before the due date. If necessary, subsequent delinquency notices are issued and the account will be monitored on a regular basis thereafter. By the 90th day of delinquency, the Company will send the borrower a final demand for payment and may recommend foreclosure. Loans are charged off when the Company believes that the recovery of principal is improbable. A summary report of all loans 30 days or more past due is provided to the board of directors of the Company each month.
	Allowance for Loan and Lease Losses
	The allowance for loan losses is established through a provision for loan losses. The Company maintains the allowance at a level believed, to the best of management’s knowledge, to cover all known and inherent losses in the portfolio that are both probable and reasonable to estimate at each reporting date. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is evaluated on no less than a quarterly basis in order to identify those inherent losses and to assess the overall collection probability for the loan portfolio. The evaluation process by portfolio segment includes, among other things, an analysis of delinquency trends, non-performing loan trends, the level of charge-offs and recoveries, prior loss experience, total loans outstanding, the volume of loan originations, the type, size and geographic concentration of the loans, the value of collateral securing the loan, the borrower’s ability to repay and repayment performance, the number of loans requiring heightened management oversight, local economic conditions and industry experience.
	The establishment of the allowance for loan losses is significantly affected by management’s judgment and uncertainties, and there is a likelihood that different amounts would be reported under different conditions or assumptions. The Office of the Commissioner of Financial Regulation of the State of Maryland as an integral part of its examination process, periodically reviews the allowance for loan losses and may require the Company to make additional provisions for estimated loan losses based upon judgments different from those of management.
	The Company’s policies, consistent with regulatory guidelines, provide for the classification of loans and other assets that are considered to be of lesser quality as substandard, doubtful, or loss assets. An asset is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard assets include those assets characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Assets (or portions of assets) classified as loss, are those considered uncollectible and of such little value that there continuance as assets is not warranted. Assets that do not expose us to risk sufficient to warrant classification in one of the aforementioned categories, but which possess potential weaknesses that deserve close attention, are required to be designated as special mention.
	A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Impairment is measured on a loan by loan basis by either 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.
	Loans may be periodically modified in a troubled debt restructuring (TDR) to make concessions to help a borrower remain current on the loan and to avoid foreclosure. Generally we do not forgive principal or interest on a loan or modify the interest rate on loans that are below market rates. When we modify loans in a TDR, we evaluate any possible impairment similar to other impaired loans. If we determine that the value of the modified loan is less than the recorded investment in the loan, impairment is recognized through a specific allowance estimate or a charge-off to the allowance.
	The allowance consists of specific, general, and unallocated components. The specific component relates to loans that are classified as doubtful, substandard, or special mention. For such loans that are also classified as impaired, a specific allowance is established for that portion of the loan that is deemed uncollectible. The general component covers non-classified loans and is based on historical loss experience adjusted for qualitative factors. An unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. Determinations as to the classification of assets and the amount of loss allowances are subject to review by our principal federal regulator, the Office of the Commissioner of Financial Regulation for the State of Maryland, which can require that we establish additional loss allowances. The Company regularly reviews its asset portfolio to determine whether any assets require classification in accordance with applicable regulations.
	The Company maintains the allowance for loan and lease losses at a level considered adequate to provide for losses inherent in the loan portfolio. While the Company utilizes available information to recognize losses on loans, future additions to the allowances for loan and lease losses may be necessary based on changes in economic conditions, particularly in its’ market area in the state of Maryland. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan and lease losses. Such agencies may require the Company to recognize additions to the allowance for loan and lease losses based on their judgments about information available to them at the time of their examination.
	Actual loan losses may be significantly more than the allowance for loan and lease losses the Company has established, which could have a material negative effect on its financial statements.
	Premises and Equipment
	Land is carried at cost. Property and equipment is carried at cost less accumulated depreciation. Depreciation is computed on the straight-line method over estimated useful lives of assets. When assets are retired or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts, and any resulting gain or loss is recognized in income for the period. The cost of maintenance and repairs is charged to expense as incurred; significant renewals and betterments are capitalized.
	Foreclosed Assets
	Assets acquired through, or in lieu of, foreclosure is initially recorded at the lower of cost (principal balance of the former mortgage loan plus costs of obtaining title and possession) or fair value at the date of acquisition. Costs relating to development and improvement of property are capitalized, whereas costs relating to the holding of property are expensed.
	Management periodically performs valuations, and an allowance for losses is established by a charge to operations if the carrying value of a property exceeds its estimated net realizable value.
	Income Taxes
	The Company accounts for income taxes in accordance with income tax accounting guidance in ASC Topic 740. The income tax accounting guidance results in two components of income tax expense – current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to taxable income or loss. Deferred taxes are provided for the temporary differences between the tax basis and the financial basis of the Company’s assets and liabilities. Deferred tax assets and liabilities are determined based on the enacted rates that are expected to be in effect when the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized. Deferred tax expense or benefit is the result of the changes in the deferred tax assets and liabilities.
	Fairmount Bancorp, Inc. has entered into a tax sharing agreement with Fairmount Bank. The agreement provides that Fairmount Bancorp, Inc. will file a consolidated federal tax return, and that the tax liability shall be apportioned among the entities as would be computed if each entity had filed a separate return. According to Maryland tax law, Fairmount Bancorp, Inc. and Fairmount Bank file separate Maryland state tax returns.
	Common Stock Repurchase Program
	The Company adopted a common stock repurchase program in which shares repurchased reduce the amount of shares issued and outstanding. The repurchased shares may be reissued in connection with share-based compensations plans and for general corporate purposes. Under this plan, the Company approved the repurchase of a specific amount of shares and will extend over a period of six months beginning September 10, 2013. The common stock repurchase program began in September 2012 and was completed in February 2013.
	Comprehensive Income (Loss)
	Accounting principles generally accepted in the United States of America require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities, are reported as a separate component of equity, such items, along with net income, are components of comprehensive income.
	Off-Balance Sheet Financial Instruments
	In the ordinary course of business, the Bank has entered into off-balance sheet financial instruments consisting of commitments to extend credit. These loans involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized on the balance sheet. Such financial instruments are recorded in the statement of income when they are funded.
	The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments is represented by the contractual amount of these instruments. The Company uses the same credit policies for these instruments as it does for the on-balance sheet instruments.
	Advertising Costs
	Advertising costs are expensed as incurred. For the years ended September 30, 2013 and 2012, advertising expense was $1,746 and $13,687 respectively.
	Concentrations of Credit Risk
	The Company has approximately $2,750,000 and $3,512,000, in deposits in other financial institutions in excess of amounts insured by the Federal Deposit Insurance Corporation (“FDIC”), as of September 30, 2013 and September 30, 2012, respectively. The Company’s management considers this a normal business risk. The Company also maintains accounts with stock brokerage firms containing securities. These balances are insured up to $500,000 by the Securities Investor Protection Corporation. The Company was required to maintain a $100,000 minimum balance in a deposit account with Maryland Financial as of September 30, 2013 and 2012, in relation to a sweep account.
	Most of the Company’s activities are with customers in the Maryland counties of Baltimore and Harford and portions of the City of Baltimore. Notes 1, 4, and 5 discuss the types of activities and lending the Company engages in. The Bank does not have any significant concentrations in any one industry or customer.
	Subsequent Events
	The company has evaluated events and transactions subsequent to September 30, 2013 through the date these financial statements were issued. Based on definitions and requirements of Generally Accepted Accounting Principles for “Subsequent Events,” the Company has not identified any events that would require adjustments to, or disclosure in the financial statements.
	Reclassifications
	Certain prior year amounts have been reclassified to conform to the current year’s method of presentation. Such reclassifications have no effect on net income.

Business_Combinations

Business Combinations	12 Months Ended
	Sep. 30, 2013
Business Combinations	'
	Note 2.	Business Combinations
	On October 12, 2011, the Company completed an acquisition of Fullerton, a federally chartered mutual savings association with one office located at 7527 Belair Road in Baltimore, Maryland. Fullerton converted from the mutual to the stock form of organization and immediately issued all of its capital stock to the Company and merged with and into the Bank. In connection with the conversion merger, the Company issued and sold 56,276 shares of its common stock at a price of $14.10 per share, resulting in proceeds of approximately $452,000, net of offering expenses of approximately $341,000.
	The Company recorded the following assets and liabilities as of October 12, 2011. These amounts represent the carrying value of Fullerton’s assets and liabilities adjusted to reflect the fair value at the date of the acquisition. The discounts and premiums resulting from the fair value adjustments will be accreted and amortized on a level yield basis over the anticipated lives of the underlying financial assets or liabilities. This amortization of premiums and discounts is not expected to have a material impact on the Company’s results of operations on future periods.
			Assets Acquired
	Assets
	Cash and cash equivalents		$	4,224,279
	Securities available for sale			827,139
	Loans receivable			2,414,712
	Federal Home Loan Bank stock, at cost			15,300
	Premises and equipment			887,503
	Other assets			174,579
	Total assets acquired		$	8,543,512
			Liabilities Assumed
	Liabilities
	Deposits		$	7,333,130
	Other liabilities			77,427
	Total liabilities assumed		$	7,410,557
	The excess fair value of assets acquired over liabilities assumed, less transaction costs incurred, resulted in $1,022,074 in negative goodwill. This negative goodwill is reflected as an extraordinary item in the Company’s consolidated financial statements.
	The primary purpose of the Fullerton acquisition was to expand the Bank’s deposit market share. The primary reasons for the stock offering by the Company were to:
		•		provide a larger capital cushion for asset growth, which will primarily be realized through existing operations;
		•		support growth and diversification of operations, products and services to transition us into a full-service community bank;
		•		improve the Company’s overall capital and competitive position;
		•		increase the Bank’s loans to one borrower limit to allow the Bank to make larger loans, including larger commercial real estate loans; and
		•		provide additional financial resources to pursue branch expansion and possible future acquisition opportunities.
	Because the individual assets and liabilities of Fullerton have been absorbed into Fairmount operations, revenue and earnings of Fullerton since the acquisition date are not available and supplemental pro forma information is not able to be provided.

Securities

Securities	12 Months Ended
	Sep. 30, 2013
Securities	'
	Note 3.	Securities
	The amortized cost and estimated fair value of securities classified as available for sale and held to maturity at September 30, 2013 and 2012, are as follows:
			September 30, 2013
			Amortized		Gross		Gross		Fair Value
			Cost		Unrealized		Unrealized
					Gains		Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities		$	3,855,067	$	166,298	$	—	$	4,021,365
	Collateralized Mortgage Obligations			535,148				5,409		529,739
	State and Municipal Securities			1,273,145		—		32,524		1,240,621
	Total securities available for sale		$	5,663,360	$	166,298	$	37,933	$	5,791,725
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations		$	3,756,238	$	4,991	$	158,526	$	3,602,703
			September 30, 2012
			Amortized		Gross		Gross		Fair Value
			Cost		Unrealized		Unrealized
					Gains		Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities		$	5,629,774	$	349,909	$	—	$	5,979,683
	Collateralized Mortgage Obligations			1,832,052		538		8,698		1,823,892
	Total securities available for sale		$	7,461,826	$	350,447	$	8,698	$	7,803,575
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations		$	1,999,145	$	11,784	$	—	$	2,010,929
	State and Municipal Securities			1,637,827		155,142		—		1,792,969
	Total securities held to maturity		$	3,636,972	$	166,926	$	—	$	3,803,898
	The amortized cost and estimated fair value of securities as of September 30, 2013, 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.
			September 30, 2013
			Securities Available for Sale				Securities Held to Maturity
			Amortized		Fair		Amortized		Fair
			Cost		Value		Cost		Value
	Due in one year or less		$	—	$	—	$	—	$	—
	Due after one year through five years			550,169		549,536		1,740,850		1,724,203
	Due five years to ten years			490,391		475,290		2,015,388		1,878,500
	Due after ten years			4,622,800		4,766,899		—		—
			$	5,663,360	$	5,791,725	$	3,756,238	$	3,602,703
	During the fiscal year ended September 30, the Company sold its state and municipal securities portfolio at a gain. These state and municipal securities were transferred from the held to maturity category to the available for sale category. Although our intention had been to hold held to maturity securities until maturity, a pre-refunding and notice of call on a municipal bond was an event that triggered our reassessment of the classification of our state and municipal withholdings. Proceeds from the sale of available for sale securities totaled $1,753,845, realizing gross gains of $116,480 for the year ended September 30, 2013. Proceeds from the sale of available for sale securities totaled $189,692, realizing gross gains of $896 for the year ended September 30, 2012.
	Securities with gross unrealized losses at September 30, 2013 and 2012 aggregated by investment category and length of time that individual securities have been in a continuous loss position are as follows:
			30-Sep-13
			Less than 12 Months				12 Months or Greater				Total
			Fair		Gross		Fair		Gross		Fair		Gross
			Value		Unrealized		Value		Unrealized		Value		Unrealized
					Losses				Losses				Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities		$	—	$	—	$	—	$	—	$	—	$	—
	Collateralized Mortgage Obligations			—		—		529,739		5,409		529,739		5,409
	State and Municipal Securities			1,240,621		32,524		—		—		1,240,621		32,524
			$	1,240,621	$	32,524	$	529,739	$	5,409	$	1,770,360	$	37,933
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations		$	2,849,720	$	158,526					$	2,849,720	$	158,526
	State and Municipal Securities			—		—		—		—		—		—
			$	2,849,720	$	158,526	$	—	$	—	$	2,849,720	$	158,526
			30-Sep-12
			Less than 12 Months				12 Months or Greater				Total
			Fair		Gross		Fair		Gross		Fair		Gross
			Value		Unrealized		Value		Unrealized		Value		Unrealized
					Losses				Losses				Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities		$	—	$	—	$	—	$	—	$	—	$	—
	Collateralized Mortgage Obligations			1,435,900		8,698		—		—		1,435,900		8,698
			$	1,435,900	$	8,698	$	—	$	—	$	1,435,900	$	8,698
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations			—	$	—	$	—	$	—	$	—	$	—
	State and Municipal Securities			—		—		—		—		—		—
		$	—	$	—	$	—	$	—	$	—	$	—
At September 30, 2013, the Company held eight investments with gross unrealized losses totaling $196,459. At September 30, 2012, the Company held two investments with gross unrealized losses totaling $8,698. The Company evaluates securities for other-than-temporary impairment on at least a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. Mortgage-backed securities are invested in U.S. Government Agencies, which guarantee payments to investors regardless of the status of the underlying mortgages. Consideration is given to the length of time and the amount of an unrealized loss, the financial condition of the issuer, and the intent an ability of the Company to retain its investment in the issuer long enough to allow for an anticipated recovery in fair value. The Company monitors the financial condition of these issuers continuously and will record other-than-temporary impairment if the recovery of value is unlikely.
Market Risks
Investments of the Company are exposed to various risks, such as interest rate, market, currency and credit risks. Due to the level of risk associated with certain investments and the level of uncertainty related to changes in the value of investments, it is at least reasonably possible that changes in risks in the near term would materially affect investment assets reported in the financial statements. In addition, recent economic uncertainty and market events have led to unprecedented volatility in currency, commodity, credit and equity markets, culminating in failures of some banking and financial service firms and government intervention to solidify others. These recent events underscore the level of investment risk associated with the current economic environment, and accordingly, the level of risk in the Company’s investments.

Loans_and_Allowance_for_Loan_a

Loans and Allowance for Loan and Lease Losses	12 Months Ended
	Sep. 30, 2013
Loans and Allowance for Loan and Lease Losses	'
	Note 4.	Loans and Allowance for Loan and Lease Losses
	The Bank makes loans to customers primarily in the counties of Baltimore and Harford and in the City of Baltimore Maryland. The principal categories of the loan portfolio at September 30, 2013 and 2012 were as follows:
			2013			2012
	Real estate loans
	One-to four-family owner occupied		$	26,363,952		$	26,097,798
	One-to four-family non-owner occupied			17,480,953			17,855,304
	Home equity			2,243,716			2,172,247
	Mobile home			1,785,854			2,068,672
	Secured by other properties			2,783,794			2,613,025
	Construction and land development			3,911,156			3,262,452
	Total real estate loans			54,569,425			54,069,498
	Other loans
	Secured commercial			1,603,318			1,212,534
	Savings			9,159			10,290
	Total other loans			1,612,477			1,222,824
	Total loans			56,181,902			55,292,322
	Unamortized premiums and loan fees			250,880			319,713
	Unearned income on loans			(323,966	)		(344,450	)
	Allowance for loan and lease losses			(733,451	)		(617,474	)
	Total loans, net		$	55,375,365		$	54,650,111
	The Company had a mobile home loan origination program that began in 2005 in which it is no longer participating. At September 30, 2013 and 2012, these loan balances totaled $1,785,854 and $2,068,672, respectively. Mobile home loans were purchased from by a third-party originator and funded by the Company at settlement. The Company paid a premium/loan origination fee to the third-party originator, of which one-half was wired upon settlement of the loan and the remainder was kept by the Company in a depository account in the name of the third-party. At September 30, 2013 and 2012, the balance in the account was $0 and $42,762, respectively, and was accessed by the Company in the event of prepayment, foreclosure or deterioration of the value of the mobile home. As of September 30, 2013 and 2012, the Company has prepaid loan origination fees related to this program of $211,177 and $261,337, which are being amortized over the estimated lives of the loans.
	In October 2004, the Company purchased a block of mortgage loans from another financial institution for $2,126,620, with an average yield of 6%. At September 30, 2013 and 2012, the loan balances were $556,213 and $657,951, respectively, and included in mortgage loans secured by one-to four family residences. In addition, the Company has unamortized loan premiums of $10,721 and $13,187, as of September 30, 2013 and 2012, respectively, being amortized over the terms of the purchased loans.
	In May 2009, the Company purchased a block of one-to four-family mortgage loans totaling $1,109,768, with an average yield of 6.08%. There was no premium paid on the purchase. The balances of purchased loans at September 30, 2013 and 2012, are included in the breakdown of loans shown above.
	Loans and their remaining contractual maturities at September 30, 2013, were as follows:
			Maturities
	One year or less		$	3,095,533
	After one year to five years			7,595,647
	After five years to ten years			17,055,071
	After ten years to fifteen years			7,862,923
	After fifteen years			20,572,728
			$	56,181,902
	In the normal course of banking business, loans are made to officers and directors and related affiliates. In the opinion of management, these loans are consistent with sound banking practices, are within regulatory limitations, and do not involve more than the normal risk of collectability.
	Loans to officers, directors and related affiliates at September 30, 2013 and 2012, were as follows:
			2013			2012
	Balance, beginning of year		$	485,531		$	513,789
	Additions			214,902			—
	Repayments			(27,113	)		(28,258	)
	Balance, end of year		$	673,320		$	485,531

Credit_Quality_of_Financing_Re

Credit Quality of Financing Receivables and the Allowance for Loan Losses	12 Months Ended
	Sep. 30, 2013
Credit Quality of Financing Receivables and the Allowance for Loan Losses	'
	Note 5.	Credit Quality of Financing Receivables and the Allowance for Loan Losses
	Management segregates the loan portfolio into portfolio segments which is defined as the level at which the Company develops and documents a systematic method for determining its allowance for loan losses. The portfolio segments are segregated based on loan types and the underlying risk factors present in each loan type. Such risk factors are periodically reviewed by management and revised as deemed appropriate.
	The Company’s loan portfolio is segregated into the following portfolio segments.
	One-to Four-Family Owner Occupied Loans. This portfolio segment consists of the origination of first mortgage loans and home equity second mortgage loans secured by one-to four-family owner occupied residential properties located in our market area. The Company has experienced no foreclosures on its owner occupied loan portfolio during recent periods and believe this is due mainly to its conservative lending strategies including its non-participation in “interest only”, “Option ARM,” “sub-prime” or “Alt-A” loans.
	One-to Four-Family Non-Owner Occupied Loans. This portfolio segment consists of the origination of first mortgage loans secured by one-to four-family non-owner occupied residential properties in its market area. A majority of these loans are sold on a participation basis to other community banks. Such lending involves additional risks, since the properties are not owner occupied, and the renters of these properties are less likely to be concerned with property upkeep.
	Mobile Home Loans. This portfolio segment consists of mobile home loans that were purchased from a third-party originator and funded by us at settlement. Mobile home lending involves additional risks as a result of higher loan-to-value ratios usually associated with these types of loans. Mobile home loan customers have historically been more adversely impacted by weak economic conditions, consequently, mobile home loans bear a higher rate of interest, have a higher probability of default, and may involve higher delinquency rates. In addition, the values of mobile home loans decline over time and higher levels of inventories of repossessed and used mobile homes may affect the values of collateral and result in higher charge-offs and provisions for loan losses. The Company ceased originating these loans in September 2007, and no future originations of these types of loans are planned.
	Secured by Other Properties. This portfolio segment includes loans secured by commercial real estate, including multi-family dwellings. Loans secured by commercial real estate generally have larger loan balances and more credit risk than one-to four-family mortgage loans. The increased risk is the result of several factors, including the concentration of principal in a limited number of loans and borrowers, the impact of local and general economic conditions on the borrower’s ability to repay the loan, and the increased difficulty of evaluating and monitoring these types of loans.
	Construction and Land Development Loans. This portfolio segment includes construction loans to individuals and builders, primarily for the construction of residential properties and land loans, which are loans made with land as security. Construction and land development financing generally involves greater credit risk than long-term financing on improved, owner-occupied real estate. Risk of loss on a construction loan depends largely upon the accuracy of the initial estimate of the value of the property at completion of construction compared to the estimated cost (including interest) of construction and other assumptions. If the estimate of construction cost proves to be inaccurate, the Company may be required to advance additional funds beyond the amount originally committed in order to protect the value of the property. Moreover, if the estimated value of the completed project proves to be inaccurate, the borrower may hold a property with a value that is insufficient to assure full repayment. Construction loans also expose the Company to the risks that improvements will not be completed on time in accordance with specifications and projected costs and that repayment will depend on the successful operation or sale of the properties. In addition, many of these borrowers have more than one outstanding loan, so an adverse development with respect to one loan or credit relationship can expose the Company to significantly greater risk of non-payment and loss.
	Other Loans. This portfolio segment includes commercial business loans secured by assignments of corporate assets and personal guarantees of the business owners and consumer loans consisting solely of deposit account loans. Commercial business loans generally have higher interest rates and shorter terms than one- to four-family residential loans, but they also may involve higher average balances, increased difficulty of loan monitoring and a higher risk of default since their repayment generally depends on the successful operation of the borrower’s business.
	Loans are generally carried at the amount of unpaid principal, less the allowance for loan losses and adjusted for deferred loan fees, which are amortized over the term of the loan using the interest method. Interest on loans is accrued based on the principal amounts outstanding. It is the Company’s policy to discontinue the accrual of interest when a loan is specifically determined to be impaired or when the principal or interest is delinquent for 90 days or more. When a loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest income generally is not recognized on specific impaired loans unless the likelihood of further loss is remote. Cash collections on such loans are applied as reductions of the loan principal and no interest income is recognized on those loans until the principal balance has been collected. The carrying value of impaired loans is based on the present value of the loan’s expected future cash flows or, alternatively, the observable market price of the loan or the fair value of the collateral.
	As a financial services provider, the Company is routinely party to various financial instruments with off-balance-sheet risks, such as commitments to extend credit and unused lines of credit. While these contractual obligations represent future cash requirements, a significant portion of commitments to extend credit may expire without being drawn upon. Such commitments are subject to the same credit policies and approval process accorded to loans made.
	Management further disaggregates the loan portfolio segments into classes of loans, which are based on the initial measurement of the loan, risk characteristics of the loan and the method for monitoring and assessing the credit risk of the loan.
	The allowance for loan losses is established through a provision for loan losses. The Company maintains the allowance at a level believed, to the best of management’s knowledge, to cover all known and inherent losses in the loan portfolio that are both probable and reasonable to estimate at each reporting date.
	Management reviews the allowance for loan losses on no less than a quarterly basis in order to identify those inherent losses and to assess the overall collection probability for the loan portfolio. The evaluation process by portfolio segment includes, among other things, an analysis of delinquency trends, non-performing loan trends, the level of charge-offs and recoveries, prior loss experience, total loans outstanding, the volume of loan originations, the type, size and geographic concentration of the loans, the value of collateral securing the loan, the borrower’s ability to repay and repayment performance, the number of loans requiring heightened management oversight, local economic conditions and industry experience.
	The establishment of the allowance for loan losses is significantly affected by management’s judgment and uncertainties, and there is a likelihood that different amounts would be reported under different conditions or assumptions. The Office of the Commissioner of Financial Regulation for the State of Maryland, as an integral part of its examination process, periodically reviews the allowance for loan losses and may require the Company to make additional provisions for estimated loan losses based upon judgments different from those of management.
	The allowance generally consists of specific and general components. The specific component relates to loans that are classified as either doubtful, substandard or special mention. The general component covers non-classified loans and is based on historical loss experience adjusted for qualitative factors.
	The Company will continue to monitor and modify its allowance for loan losses as conditions dictate. No assurances can be given that the level of allowance for loan losses will cover all of the inherent losses on the loans or that future adjustments to the allowance for loan losses will not be necessary if economic and other conditions differ substantially from the economic and other conditions used by management to determine the current level of the allowance for loan losses.
	The following tables set forth as of the end of each reporting period, the balance of the allowance for loan losses by portfolio segment, disaggregated by impairment methodology, which is then further segregated by amounts evaluated for impairment collectively and individually. The allowance for loan losses allocated to each portfolio segment is not necessarily indicative of future losses in any particular portfolio segment and does not restrict the use of the allowance to absorb losses in other portfolio segments.
			As of September 30, 2013
			One-to				One-to				Mobile			Secured by			Construction			Other			Unallocated			Total
			Four-Family				Four-Family				Home			Other			and Land			Loans
			Owner				Non-Owner							Properties			Development
			Occupied				Occupied
	Allowance for Credit Losses:
	Beginning Balance		$	85,217			$	273,683			$	95,613		$	30,442		$	80,327		$	3,057		$	49,135		$	617,474
	Charge-offs			—				(363,842	)			(23,921	)		—			—			—			—			(387,763	)
	Recoveries			—				3,740				—			—			—			—			—			3,740
	Provision			(4,654	)			562,003				9,251			(8,077	)		(49,522	)		974			(9,975	)		500,000
	Ending Balance		$	80,563			$	475,584			$	80,943		$	22,365		$	30,805		$	4,031		$	39,160		$	733,451
	Ending balance: individually evaluated for impairment		$	—			$	201,267			$	488		$	—		$	—		$	—		$	—		$	201,755
	Ending balance: collectively evaluated for impairment		$	80,563			$	274,317			$	80,455		$	22,365		$	30,805		$	4,031		$	39,160		$	531,696
	Ending balance: loans acquired with deteriorated credit quality		$	—			$	—			$	—		$	—		$	—		$	—		$	—		$	—
	Financing receivables:
	Ending balance		$	28,607,668			$	17,480,953			$	1,785,854		$	2,783,794		$	3,911,156		$	1,612,477					$	56,181,902
	Ending balance: individually evaluated for impairment		$	436,317			$	1,635,383			$	105,940		$	213,099		$	370,411		$	—					$	2,761,150
	Ending balance: collectively evaluated for impairment		$	27,780,213			$	15,845,570			$	1,679,914		$	2,570,695		$	3,540,745		$	1,612,477					$	53,029,614
	Ending balance: loans acquired with deteriorated credit quality		$	391,138			$	—			$	—		$	—		$	—		$	—					$	391,138
			As of September 30, 2012
			One-to				One-to				Mobile			Secured by			Construction			Other			Unallocated			Total
			Four-Family				Four-Family				Home			Other			and Land			Loans
			Owner				Non-Owner							Properties			Development
			Occupied				Occupied
	Allowance for Credit Losses:
	Beginning Balance		$	64,547			$	382,023			$	52,719		$	25,702		$	91,135		$	3,907		$	45,256		$	665,289
	Charge-offs			(72,815	)			(175,000	)			—			—			—			—			—			(247,815	)
	Recoveries			—				—				—			—			—			—			—			—
	Provision			93,485				66,660				42,894			4,740			(10,808	)		(850	)		3,879			200,000
	Ending Balance		$	85,217			$	273,683			$	95,613		$	30,442		$	80,327		$	3,057		$	49,135		$	617,474
	Ending balance: individually evaluated for impairment		$	—			$	30,901			$	36,517		$	—		$	—		$	—		$	—		$	67,418
	Ending balance: collectively evaluated for impairment		$	85,217			$	242,782			$	59,096		$	30,442		$	80,327		$	3,057		$	49,135		$	550,056
	Ending balance: loans acquired with deteriorated credit quality		$	—			$	—			$	—		$	—		$	—		$	—		$	—		$	—
	Financing receivables:
	Ending balance		$	28,270,045			$	17,855,304			$	2,068,672		$	2,613,025		$	3,262,452		$	1,222,824					$	55,292,322
	Ending balance: individually evaluated for impairment		$	437,872			$	1,577,271			$	152,256		$	216,000		$	—		$	—					$	2,383,399
	Ending balance: collectively evaluated for impairment		$	27,434,223			$	16,278,033			$	1,916,416		$	2,397,025		$	3,262,452		$	1,222,824					$	52,510,973
	Ending balance: loans acquired with deteriorated credit quality		$	397,950			$	—			$	—		$	—		$	—		$	—					$	397,950
	The Company’s policies, consistent with regulatory guidelines, provide for the classification of loans and other assets that are considered to be of lesser quality as substandard, doubtful, or loss assets. An asset is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard assets include those assets characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Assets (or portions of assets) classified as loss are those considered uncollectible and of such little value that there continuance as assets is not warranted. Assets that do not expose us to risk sufficient to warrant classification in one of the aforementioned categories, but which possess potential weaknesses that deserve close attention, are required to be designated as special mention.
	When assets are classified as either substandard or doubtful, the Company allocates a portion of the related general loss allowances to such assets as the Company deems prudent. Determinations as to the classification of assets and the amount of loss allowances are subject to review by our principal federal regulator, the Office of the Commissioner of Financial Regulation of the State of Maryland, which can require that we establish additional loss allowances. The Company regularly reviews its asset portfolio to determine whether any assets require classification in accordance with applicable regulations.
	The following tables are a summary of the loan portfolio quality indicators by loan class recorded investment as of September 30, 2013 and September 30, 2012:
			September 30, 2013
			One-to				One-to				Home			Mobile			Secured			Construction
			Four-Family				Four-Family				Equity			Home			by			and Land
			Owner				Non-Owner										Other			Development
Occupied			Occupied											Properties
Grade:
Pass		$	25,536,497			$	15,291,094			$	2,243,716		$	1,655,013		$	2,570,695		$	3,540,745
Special Mention			—				—				—			—			—			—
Substandard			827,455				1,845,206				—			130,841			213,099			370,411
Doubtful			—				344,653				—			—			—			—
		$	26,363,952			$	17,480,953			$	2,243,716		$	1,785,854		$	2,783,794		$	3,911,156
		Secured				Savings				Totals
		Commercial
Grade:
Pass		$	1,603,318			$	9,159			$	52,450,238
Special Mention			—				—				—
Substandard			—				—				3,387,011
Doubtful			—				—				344,653
		$	1,603,318			$	9,159			$	56,181,902
		September 30, 2012
		One-to				One-to				Home			Mobile			Secured			Construction
		Four-Family				Four-Family				Equity			Home			by			and Land
		Owner				Non-Owner										Other			Development
		Occupied				Occupied										Properties
Grade:
Pass		$	25,261,976			$	15,904,215			$	2,172,247		$	1,814,197		$	2,397,025		$	2,820,472
Special Mention			—				—				—			74,743			—			—
Substandard			835,822				1,951,089				—			179,732			—			441,980
Doubtful			—				—				—			—			216,000			—
		$	26,097,798			$	17,855,304			$	2,172,247		$	2,068,672		$	2,613,025		$	3,262,452
		Secured				Savings				Totals
		Commercial
Grade:
Pass		$	1,212,534			$	10,290			$	51,592,956
Special Mention			—				—				74,743
Substandard			—				—				3,408,623
Doubtful			—				—				216,000
		$	1,212,534			$	10,290			$	55,292,322
When a loan is 15 days past due, the Company sends the borrower a late notice. The Company also contacts the borrower by phone if the delinquency is not corrected promptly after the notice has been sent. When the loan is 30 days past due, the Company mails the borrower a letter reminding the borrower of the delinquency, and attempt to contact the borrower personally to determine the reason for the delinquency in order to ensure that the borrower understands the terms of the loan and the importance of making payments on or before the due date. If necessary, subsequent delinquency notices are issued and the account will be monitored on a regular basis thereafter. By the 90th day of delinquency, the Company will send the borrower a final demand for payment and may recommend foreclosure. Loans are charged off when the Company believes that the recovery of principal is improbable. A summary report of all loans 30 days or more past due is provided to the board of directors of the Company each month.
Loans are automatically placed on non-accrual status when payment of principal or interest is more than 90 days delinquent. Loans are also placed on non-accrual status if collection of principal or interest in full is in doubt or if the loan has been restructured. When loans are placed on non-accrual status, unpaid accrued interest is fully reversed, and further income is recognized only to the extent received. The loan may be returned to accrual status if unpaid principal and interest are repaid so that the loan is less than 90 days delinquent.
The following tables set forth certain information with respect to our loan portfolio delinquencies by loan class and amount as of September 30, 2013, and September 30, 2012:
		September 30, 2013
		30-59				60-89				Greater			Total Past			Current			Total			Recorded
		Days Past				Days Past				Than 90			Due						Financing			Investment >
		Due				Due				Days									Receivables			90 Days and
																						Accruing
Real estate loans:
One-to four-family owner occupied		$	—			$	—			$	690,975		$	690,975		$	25,672,977		$	26,363,952		$	—
One-to four-family non-owner occupied			—				—				1,635,383			1,635,383			15,845,570			17,480,953			—
Home equity			—				—				—			—			2,243,716			2,243,716			—
Mobile home			73,774				—				—			73,774			1,712,080			1,785,854			—
Secured by other properties			—				—				—			—			2,783,794			2,783,794			—
Construction and land development			—				—				—			—			3,911,156			3,911,156			—
Total real estate loans			73,774				—				2,326,358			2,400,132			52,169,293			54,569,425			—
Other loans:
Secured commercial			—				—				—			—			1,603,318			1,603,318			—
Savings accounts			—				—				—			—			9,159			9,159			—
Total other loans			—				—				—			—			1,612,477			1,612,477			—
Total loans		$	73,774			$	—			$	2,326,358		$	2,400,132		$	53,781,770		$	56,181,902		$	—
		September 30, 2012
		30-59				60-89				Greater			Total Past			Current			Total			Recorded
		Days Past				Days Past				Than 90			Due						Financing			Investment >
		Due				Due				Days									Receivables			90 Days and
																						Accruing
Real estate loans:
One-to four-family owner occupied		$	—			$	—			$	835,822		$	835,822		$	25,261,976		$	26,097,798		$	—
One-to four-family non-owner occupied			228,229				—				721,392			949,621			16,905,683			17,855,304			—
Home equity			—				—				—			—			2,172,247			2,172,247			—
Mobile home			46,927				—				103,541			150,468			1,918,204			2,068,672			—
Secured by other properties			—				—				216,000			216,000			2,397,025			2,613,025			—
Construction and land development			—				—				—			—			3,262,452			3,262,452			—
Total real estate loans			275,156				—				1,876,755			2,151,911			51,917,587			54,069,498			—
Other loans:
Secured commercial			—				—				—			—			1,212,534			1,212,534			—
Savings accounts			—				—				—			—			10,290			10,290			—
Total other loans			—				—				—			—			1,222,824			1,222,824			—
Total loans		$	275,156			$	—			$	1,876,755		$	2,151,911		$	53,140,411		$	55,292,322		$	—
The following table is a summary of the non-accrual loans by loan class as of:
		September 30,				September 30,
		2013				2012
Real estate loans:
One-to four-family owner occupied		$	690,975			$	835,822
One-to four-family non-owner occupied			1,635,383				721,392
Home equity			—				—
Mobile home			59,554				103,541
Secured by other properties			—				216,000
Construction and land development			—				—
Total real estate loans			2,385,912				1,876,755
Other loans:
Secured commercial			—				—
Savings accounts			—				—
Total other loans			—				—
Total loans		$	2,385,912			$	1,876,755
At September 30, 2013 and September 30, 2012, there were no loans 90 days past due and still accruing interest. At September 30, 2013, the Company had twenty-nine loans on non-accrual status with foregone interest in the amount of $251,798. At September 30, 2012, the Company had twenty-three loans on non-accrual status with foregone interest in the amount of $160,495.
The Company accounts for impaired loans under generally accepted accounting principles. An impaired loan generally is one for which it is probable, based on current information, that the lender will not collect all the amounts due under the contractual terms of the loan. Loans are individually evaluated for impairment. When the Company classifies a problem asset as impaired, it provides a specific reserve for that portion of the asset that is deemed uncollectible based on the present value of expected future cash flows discounted at the loan’s original effective interest rate, or based on the loan’s observable market price or fair value of the collateral if the loan is collateral dependent.
The following tables are a summary of impaired loans by class as of September 30, 2013 and September 30, 2012:
		September 30, 2013
		Recorded				Unpaid				Related			Average			Interest
		Investment				Principal				Allowance			Recorded			Income
						Balance							Investment			Recognized
With no related allowance recorded:
One-to four-family owner occupied		$	904,113			$	827,455			$	—		$	904,113		$	31,184
One-to four-family non-owner occupied			609,362				507,227				—			609,362			13,288
Secured by other properties			226,434				213,099				—			226,434			684
Construction and land development			370,411				370,411				—			370,411			20,043
Mobile homes			59,627				59,554				—			59,627			4,078
With an allowance recorded:
One-to four-family non-owner occupied		$	1,217,512			$	1,128,156			$	201,267		$	1,217,512		$	21,255
Mobile home			46,508				46,386				488			46,508			3,097
Total
One-to four-family owner occupied		$	904,113			$	827,455			$	—		$	904,113		$	31,184
One-to four-family non-owner occupied			1,867,709				1,635,383				201,267			1,867,709			34,543
Secured by other properties			226,434				213,099				—			226,434			684
Construction and land development			370,411				370,411				—			370,411			20,043
Mobile home			106,135				105,940				488			106,135			7,175
		September 30, 2012
		Recorded				Unpaid				Related			Average			Interest
		Investment				Principal				Allowance			Recorded			Income
						Balance							Investment			Recognized
With no related allowance recorded:
One-to four-family owner occupied		$	877,758			$	835,822			$	—		$	877,758		$	25,376
One-to four-family non-owner occupied			896,218				721,392				—			896,218			15,792
Secured by other properties			227,819				216,000				—			225,834			—
With an allowance recorded:
One-to four-family non-owner occupied		$	856,752			$	855,879			$	30,901		$	856,752		$	47,446
Mobile home			165,267				152,256				36,517			165,267			9,561
Total
One-to four-family owner occupied		$	877,758			$	835,822			$	—		$	877,758		$	25,376
One-to four-family non-owner occupied			1,752,970				1,577,271				30,901			1,752,970			63,238
Secured by other properties			227,819				216,000				—			227,819			—
Mobile home			165,267				152,256				36,517			165,267			9,561
Loans may be periodically modified in a troubled debt restructuring (a “TDR”) to make concessions to help a borrower remain current on the loan and/or to avoid foreclosure. Generally we do not forgive principal or interest on a loan or modify the interest rate on loans that are below market rates. When we modify loans in a TDR, we evaluate any possible impairment similar to other impaired loans. If we determine that the value of the modified loan is less than the recorded investment in the loan, impairment is recognized through a specific allowance estimate or a charge-off to the allowance. At September 30, 2013, we had ten loans that were restructured. One loan was secured by a one-to four-family owner occupied property in the amount of $136,481. Five loans to the same borrower in the amount of $783,503 were secured by one-to four-family non-owner occupied properties. One loan was secured by other properties in the amount of $213,099, one loan was secured by construction and land development in the amount of $370,411 and two loans were secured by a mobile homes in the amount of $105,940. At September 30, 2012, we had eight loans that were restructured. One loan was secured by a one-to four-family owner occupied property in the amount of $138,035. Five loans to the same borrower in the amount of $855,879 were secured by one-to four-family non-owner occupied properties. One loan was secured by other properties in the amount of $216,000 and one loan was secured by a mobile home loan in the amount of $51,313. The Company has no commitments to loan additional funds to borrowers whose loans have been modified.
The following table is a summary of impaired loans that were modified due to a troubled debt restructuring by class as of September 30, 2013 and September 30, 2012:
		Modifications for the year ended September 30, 2013
		Number of		Pre-Modification				Post-Modification
		contracts		Outstanding Recorded				Outstanding Recorded
				Investments				Investments
Troubled Debt Restructuring
Construction and land development		1		$	370,411			$	370,411
Mobile home		1			59,627				59,627
				Recorded Investment
Troubled Debt Restructuring that subsequently defaulted
One-to four-family owner occupied					1			$	67,000
		Modifications for the year ended September 30, 2012
		Number of		Pre-Modification				Post-Modification
		contracts		Outstanding Recorded				Outstanding Recorded
				Investments				Investments
Troubled Debt Restructuring
One-to four-family owner occupied		1		$	151,932			$	151,932
One-to four-family non-owner occupied		5			856,752				825,851
Secured by other properties		1			227,819				227,819
Mobile home		1			48,715				46,198
				Recorded Investment
Troubled Debt Restructuring that subsequently defaulted
One-to four-family owner occupied		1		$	151,932

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Sep. 30, 2013
Premises and Equipment	'
	Note 6.	Premises and Equipment
	Premises and equipment at September 30, 2013 and 2012, were as follows:
			2013			2012			Depreciable
									Lives
	Cost
	Land		$	1,142,089		$	1,142,089			-
	Buildings and land improvements			2,031,589			2,031,589			10-50 yrs
	Furniture, fixtures, and equipment			518,026			467,949			3-7 yrs
	Total			3,691,704			3,641,627
	Less: accumulated depreciation			(536,642	)		(404,632	)
			$	3,155,062		$	3,236,995
	Depreciation expense totaled $132,010 and $123,727 for the years ended September 30, 2013 and 2012, respectively.

Foreclosed_Real_Estate

Foreclosed Real Estate	12 Months Ended
	Sep. 30, 2013
Foreclosed Real Estate	'
	Note 7.	Foreclosed Assets
	At September 30, 2013 and 2012, the Company had $20,000 and $295,750 in foreclosed assets, respectively. A charge to the Allowance for Loan Losses during the year ended September 30, 2013 and 2012 of $16,781 and $0, respectively was taken at the time the foreclosed property was placed in foreclosed assets. The Company disposed of foreclosed assets in the fiscal year 2013 in the amount of $295,750 and recorded a loss of $23,723. The Company disposed of foreclosed assets in fiscal year 2012 in the amount of $347,846 and recorded a loss of $18,404 on the transaction.

Deposits

Deposits	12 Months Ended
	Sep. 30, 2013
Deposits	'
	Note 8.	Deposits
	The aggregate amount of deposits with balances of $100,000 or more totaled $15,445,563 and $18,608,689 at September 30, 2013 and 2012, respectively.
	Deposit accounts are federally insured up to $250,000 per depositor. On January 1, 2014, the FDIC insurance limit will return to $100,000 per depositor for all deposit categories except for IRA and certain retirement accounts, which will remain at $250,000 per depositor.
	Certificates of deposit and their remaining maturities at September 30, 2013, are as follows:
	2014		$	17,425,755
	2015			8,782,333
	2016			2,751,064
	2017			2,176,707
	2018			3,306,510
			$	34,442,369
	Deposit balances of employees, officers, directors and their affiliated interests totaled $202,179 and $226,814 at September 30, 2013 and 2012, respectively. The Company had no brokered deposits at September 30, 2013 and 2012.

Borrowings

Borrowings	12 Months Ended
	Sep. 30, 2013
Borrowings	'
	Note 9.	Borrowings
	The Company has advances outstanding from the Federal Home Loan Bank (“FHLB”). A schedule of the borrowings is as follows:
	Advance				Rate			Maturity		September 30,		September 30,
	Amount							Date		2013		2012
	$	1,000,000				4.235	%		7/31/17	$	1,000,000	$	1,000,000
		1,000,000				4.01	%		8/21/17		1,000,000		1,000,000
		1,500,000				3.227	%		11/24/17		1,500,000		1,500,000
		1,500,000				3.4	%		11/27/17		1,500,000		1,500,000
		1,000,000				2.599	%		10/2/18		1,000,000		1,000,000
		1,000,000				2.6	%		7/2/18		1,000,000		1,000,000
		1,000,000				3.05	%		7/3/18		1,000,000		1,000,000
										$	8,000,000	$	8,000,000
	Interest payments are due quarterly. After a loan specific holding period, the borrowings are callable by the FHLB, at which time the Company is able to convert from a fixed rate to a variable rate based on LIBOR. The Company has credit availability of 30% of the Bank’s total assets. Pursuant to collateral agreements with the FHLB, the advances are secured by the Company’s FHLB stock and qualifying residential first mortgage loans, totaling approximately $36,900,000 as of September 30, 2013.
	Additionally, the Company has credit availability of $1,500,000 with a correspondent bank for short term liquidity needs, if necessary. There were no borrowings outstanding at September 30, 2013 and 2012, under these facilities.
	At September 30, 2013, the scheduled maturities of the FHLB advances are as follows:
	2014		$	—
	2015			—
	2016			—
	2017			2,000,000
	2018			5,000,000
	Thereafter			1,000,000
			$	8,000,000

Income_Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2013
Income Taxes	'
	Note 10.	Income Taxes
	The income tax provision reflected in the statements of income consisted of the following components for the years ended September 30, 2013 and 2012:
			2013			2012
	Income tax expense
	Current tax expense
	Federal		$	139,077		$	166,554
	State			34,118			53,381
	Total current			173,195			219,935
	Deferred tax expense (benefit)
	Federal			8,834			(105,141	)
	State			(1,302	)		(367	)
	Total deferred			7,532			(105,508	)
	Total income tax expense		$	180,727		$	114,427
	A reconciliation of tax computed at the Federal statutory tax rate of 34% to the actual tax expense for the years ended September 30, 2013 and 2012, is as follows:
			2013			2012
	Tax at Federal statutory rate		$	149,987		$	498,725
	Tax effect of:
	Nontaxable gain on business combination			—			(347,505	)
	Tax exempt income			(3,712	)		(16,605	)
	Graduated rates			13,546			(55,181	)
	State income taxes, net of federal benefit			20,906			34,993
	Income tax expense		$	180,727		$	114,427
	The components of the net deferred tax asset (liability) at September 30, 2013 and 2012 were as follows:
			2013			2012
	Deferred income tax assets:
	Nonaccrual interest		$	99,334		$	63,315
	Loans yield adjustment			11,291			17,827
	Certificate of deposit yield adjustment			—			8,750
	Core deposit intangible			4,494			—
	ESOP Plan funding			—			7,053
	Stock Option Plan			14,866			—
	Deferred compensation			—			3,223
	Allowance for loan losses			289,346			243,593
	Foreclosed real estate provision			—			87,579
				419,331			431,340
	Deferred income tax liabilities:
	Net unrealized gain on securities			50,639			134,819
	Core deposit intangible			—			2,667
	Certificate of deposit yield adjustment			6,668			—
	Accumulated depreciation			74,278			82,755
				131,585			220,241
	Net deferred income tax asset (liability)		$	287,746		$	211,099
	The Company maintains $731,536 of its retained earnings as a reserve for loan losses for tax purposes. This amount has not been charged against earnings and is a restriction on retained earnings. If this balance in the reserve account is used for anything but losses on mortgage loans or payment of special assessment taxes, it will be subject to federal income taxes.
	As of September 30, 2013, the Company had remaining net operating loss carryforwards from the Fullerton acquisition of approximately $335,000, which expire in 2031. These net operating loss carryforwards may be used to offset future income taxes payable, however the Bank may be subject to alternative minimum tax. Their realization is dependent on future taxable income and may be subject to limits under IRC Section 382.
	The Company follows the FASB Accounting Standards Codification, which provides guidance on accounting for uncertainty in income taxes recognized in an enterprise’s financial statements. The guidance prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return, and also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. As of September 30, 2013, the Company had no uncertain tax positions that qualify for either recognition or disclosure in the Company’s financial statements. The Company’s policy is to recognize interest and penalties on unrecognized tax benefits in income tax expense in the financial statements. No interest and penalties were recorded during the period ended September 30, 2013. Generally, the tax years before 2007 are no longer subject to examination by federal, state or local taxing authorities.

Defined_Contribution_Benefit_P

Defined Contribution Benefit Plan	12 Months Ended
	Sep. 30, 2013
Defined Contribution Benefit Plan	'
	Note 11.	Defined Contribution Benefit Plan
	In July 2009, the Company established a 401(k) plan covering all full-time employees who have attained an age of 21 and have completed 12 months of service. The plan provides for the Company to make contributions which will match employee deferrals on a one-to-one basis up to 4% of an employee’s eligible compensation. Participants are 100% vested in their deferrals and employer matching contributions. Additional contributions can be made at the discretion of the Board of Directors based on the Company’s performance. Contributions for the years ended September 30, 2013 and 2012 were $25,510 and $25,481, respectively.

Employee_Stock_Ownership_Plan

Employee Stock Ownership Plan	12 Months Ended
	Sep. 30, 2013
Employee Stock Ownership Plan	'
	Note 12.	Employee Stock Ownership Plan
	In connection with the conversion to stock form in June 2010, the Company established an Employee Stock Ownership Plan (“ESOP”) for the exclusive benefit of eligible employees. The ESOP borrowed funds from the Company in the amount of $355,230, which was sufficient to purchase 35,523 shares or 8% of the common stock issued and sold in the initial public offering in June 2010. The shares were acquired at a price of $10.00 per share. The ESOP borrowed additional funds from the Company in the amount of $63,478, which was sufficient to purchase 4,502 shares or 8% of the common stock issued and sold in the conversion merger of Fullerton in October 2011. The shares were acquired at a price of $14.10 per share.
	The loans are secured by the shares purchased with the loan proceeds and will be repaid by the ESOP over the 10-year terms of the loans with funds from Fairmount Bank’s contributions to the ESOP and dividends paid on the stock, if any. The interest rate on the ESOP loans is an adjustable rate equal to the lowest prime rate, as published in The Wall Street Journal. The interest rate will adjust annually and will be the prime rate on the last business day of the fiscal year. The interest rate on the loan as of September 30, 2013, is 3.25%.
	Shares purchased with the loan proceeds are held in a suspense account for allocation among participants as the loan is repaid. Contributions to the ESOP and shares released from the suspense account are allocated among participants in proportion to their compensation, relative to total compensation of all active participants. Participants will vest their accrued benefits under the employee stock ownership plan at the rate of 20% per year. Vesting is accelerated upon retirement, death or disability of the participant, or a change in control of the Bank. Forfeitures will be reallocated to remaining plan participants. Benefits may be payable upon retirement, death, disability, separation of service, or termination of the ESOP.
	The debt of the ESOP, in accordance with generally accepted accounting principles, is eliminated in consolidation and the shares pledged as collateral are reported as unearned ESOP shares in the consolidated balance sheet. Contributions to the ESOP shall be sufficient to pay principal and interest currently due under the loan agreement. As shares are committed to be released from collateral, the Company reports compensation expense equal to the average market price of the shares for the respective period, and the shares become outstanding for earnings per share computations. Dividends on allocated ESOP shares are recorded as a reduction of debt and accrued interest. ESOP compensation expense for the years ended September 30, 2013 and 2012 was $71,676 and $59,750, respectively.
	A summary of ESOP shares is as follows:
			September 30,		September 30,
			2013		2012
	Shares committed for release			20,527		16,525
	Unearned shares			19,498		23,500
	Total ESOP shares			40,025		40,025
	Fair value of unearned shares		$	389,960	$	399,500

Recognition_and_Retention_Plan

Recognition and Retention Plan	12 Months Ended
	Sep. 30, 2013
Recognition and Retention Plan	'
	Note 13.	Recognition and Retention Plan
	On December 15, 2010, the Board of Directors adopted the 2010 Recognition and Retention Plan and Trust Agreement (the “RRP”), which was approved at the 2011 Annual Meeting of Stockholders. The RRP is designed to enable Fairmount to provide officers, other employees and non-employee directors with a proprietary interest in Fairmount and as incentive to contribute to its success. Officers, other employees and non-employee directors who are selected by the board of directors or members of a committee appointed by the Board will be eligible to receive benefits under the RRP.
	The Board may make grants under the 2010 Recognition and Retention Plan to eligible participants based on the following factors. RRP participants will vest in their share awards at a rate no more rapid than 20% per year over a five year period, beginning on the date of the plan share award. If service to the Company is terminated for any reason other than death, disability or change in control, the unvested share awards will be forfeited. As of September 30, 2013, 15,104 shares have been awarded under the plan. The Company recorded compensation expense of $42,568 for the year ended September 30, 2013. The Company did not record compensation expense for the year ended September 30, 2012.
	The Recognition and Retention Plan Trust (the “Trust”) has been established to acquire, hold, administer, invest and make distributions from the Trust in accordance with provisions of the Plan and Trust. The Company will contribute sufficient funds to the Trust so that the Trust can acquire 17,761 shares of common stock as part of the initial public offering, which are held in the Trust subject to the RRP’s vesting requirements. The RRP provides that grants to each employee and non-employee director shall not exceed 25% and 5% of the shares available under the Plan, respectively. Shares awarded to non-employee directors in the aggregate shall not exceed 30% of the shares available under the RRP.

Stock_Option_Plan

Stock Option Plan	12 Months Ended
	Sep. 30, 2013
Stock Option Plan	'
	Note 14.	Stock Option Plan
	On December 15, 2010, the Board of Directors adopted the 2010 Stock Option Plan. The 2010 Stock Option Plan will provide Fairmount’s directors and key employees with a proprietary interest in Fairmount as an as incentive to contribute to its success. The Board of Directors of the Company may grant options to eligible employees and non-employee directors based on these factors. Plan participants will vest in their options at a rate of no more rapid than 20% per year over a five year period, beginning on the grant date of the option. Vested options will have an exercise period of ten years commencing on the date of grant. If service to the Company is terminated for any reason other than death, disability or change in control, the unvested options shall be forfeited. The Company recognizes compensation expense during the vesting period based on the fair value of the option on the date of the grant calculated using the Black Scholes Model. As of September 30, 2013, 37,760 options have been granted to eligible employees and non-employee directors. The Company recorded compensation expense of $37,684 for the year ended September 30, 2013. The Company did not record compensation expense for the year ended September 30, 2012.
	A summary of the Stock Option Plan year ended September 30, 2013:
			Number of		Weighted Average
			Shares		Exercise
					Price
	Outstanding at September 30, 2012			37,760	$	14.1
	Granted			37,760	$	14.1
	Outstanding at September 30, 2013			37,760	$	14.1
	Options Exercisable at September 30, 2013			7,552	$	14.1

Stock_Repurchases

Stock Repurchases	12 Months Ended
	Sep. 30, 2013
Stock Repurchases	'
	Note 15.	Stock Repurchases
	On September 7, 2012, the Board of Directors authorized the repurchase of up to 25,000 shares of the Company’s outstanding common stock. The repurchase program is equal to approximately 5% of the total shares outstanding. On October 4, 2012, the Board of Directors approved an increase in its current stock repurchase program from 25,000 to 40,000 shares, which is equal to approximately 8% of the total shares outstanding. The repurchase program began on September 10, 2012 and will occur over a period of six months. The following table sets forth information in connection with repurchases of the Company’s shares of common stock during the period listed.
	Period		Total		Average		Total Number of		Maximum
			Number of		Price		Shares		Number of
			Shares		Paid per		Purchased as		Shares That May
			Purchased		Share		Part of Publicly		Yet Be Purchased
							Announced Plans		Under the Plan
							or Programs
	September 1-30, 2012			22,800	$	17.07		22,800		17,200
	October 1-31, 2012			6,000		17.05		28,800		11,200
	November 1-30, 2012			1,800		17.1		30,600		9,400
	December 1-31, 2012			—		—		30,600		9,400
	January 1-31, 2013			—		—		30,600		9,400
	February 1-28, 2013			—		—		30,600		9,400

Deferred_Compensation_Obligati

Deferred Compensation Obligation	12 Months Ended
	Sep. 30, 2013
Deferred Compensation Obligation	'
	Note 16.	Deferred Compensation Obligation
	In February 1985, the Company entered into a deferred compensation arrangement with its former president, with payments to him or his heirs to commence on the first day of the month coinciding with the date the president attained seventy-one years of age and continue for a minimum of 10 years. The former president, at his own discretion, decided to delay the start of this agreement until fiscal year 2004.
	In June 2004, the Company accrued a deferred compensation obligation of $66,237, relating to this agreement, utilizing a 5% interest factor for present value calculations. This liability is intended to be ultimately funded by a $100,000 whole life insurance policy owned by the Company, insuring the former president. The final payment of the obligation was paid in July 2012. The life insurance policy was collected in the current fiscal year due to the death of the insured in July 2013.

Regulatory_Capital_Requirement

Regulatory Capital Requirements	12 Months Ended
	Sep. 30, 2013
Regulatory Capital Requirements	'
	Note 17.	Regulatory Capital Requirements
	The Bank is subject to various regulatory capital requirements administered by Federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Bank’s financial statements. The Bank must meet specific capital adequacy guidelines that involve quantitative measures of the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios (as defined in the regulations) of total and Tier 1 capital to risk-weighted assets, and of Tier 1 capital to adjusted total assets. Management believes, as of September 30, 2013 and 2012, that the Bank meets all capital adequacy requirements to which it is subject.
	As of September 30, 2013, the most recent notification from the Bank’s regulators categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as well capitalized the Bank must maintain minimum total risk-based capital, Tier 1 capital to risk-weighted assets, and Tier 1 capital to adjusted total assets, ratios. There have been no conditions or events since that notification that management believes have changed the Bank’s category.
	The actual and required capital amounts and ratios of the Company and the Bank as of September 30, 2013 and 2012, were as follows (dollars in thousands):
			Actual						For Capital					To Be Well
									Adequacy Purposes					Capitalized under
														the Prompt
														Corrective Action
														Provisions
			Amount			Ratio			Amount		Ratio			Amount		Ratio
	As of September 30, 2013:
	Fairmount Bancorp, Inc.
	Total Risk-based Capital (to risk-weighted assets)			13,420			31.99	%		3,373		³8.0	%		N/A		N/A
	Tier 1 Capital (to risk-weighted assets)			12,893			30.73	%		1,686		³4.0	%		N/A		N/A
	Tier 1 Capital (to adjusted total assets)			12,893			16.75	%		3,080		³4.0	%		N/A		N/A
	Tangible Capital (to tangible assets)			12,893			16.75	%		1,155		³1.5	%		N/A		N/A
	Fairmount Bank
	Total Risk-based Capital (to risk-weighted assets)			11,824			28.24	%		3,366		³8.0	%		4,169		³10.0	%
	Tier 1 Capital (to risk-weighted assets)			11,298			26.98	%		1,683		³4.0	%		2,501		³6.0	%
	Tier 1 Capital (to adjusted total assets)			11,298			14.7	%		3,074		³4.0	%		3,943		³5.0	%
	Tangible Capital (to tangible assets)			11,298			14.7	%		1,153		³1.5	%		N/A		N/A
	As of September 30, 2012:
	Fairmount Bancorp, Inc.
	Total Risk-based Capital (to risk-weighted assets)			13,171			31.53	%		3,342		³8.0	%		N/A		N/A
	Tier 1 Capital (to risk-weighted assets)			12,648			30.27	%		1,671		³4.0	%		N/A		N/A
	Tier 1 Capital (to adjusted total assets)			12,648			16.01	%		3,160		³4.0	%		N/A		N/A
	Tangible Capital (to tangible assets)			12,648			16.01	%		1,185		³1.5	%		N/A		N/A
	Fairmount Bank
	Total Risk-based Capital (to risk-weighted assets)			11,353			27.23	%		3,335		³8.0	%		4,169		³10.0	%
	Tier 1 Capital (to risk-weighted assets)			10,831			25.98	%		1,668		³4.0	%		2,501		³6.0	%
	Tier 1 Capital (to adjusted total assets)			10,831			13.73	%		3,154		³4.0	%		3,943		³5.0	%
	Tangible Capital (to tangible assets)			10,831			13.73	%		1,183		³1.5	%		N/A		N/A
	The following table presents a reconciliation of the Company’s consolidated equity as determined using U.S. GAAP and the Bank’s regulatory capital amounts:
			September 30,
			2013			2012
	Consolidated equity GAAP equity		$	13,003		$	12,855
	Consolidated equity in excess of Bank equity			(1,594	)		(1776	)
	Bank GAAP equity			11,409			11,079
	Core deposit intangible			(33	)		(41	)
	Accumulated other comprehensive (income) loss, net of tax			(78	)		(207	)
	Total tangible, leverage and core (tier 1) capital			11,298			10,831
	Qualifying allowance for loan losses			526			522
	Total risk-based capital		$	11,824		$	11,353

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Sep. 30, 2013
Fair Value Measurements	'
	Note 18.	Fair Value Measurements
	Generally accepted accounting principles (GAAP) define fair value, establish a framework for measuring fair value, a three-level valuation hierarchy for disclosure of fair value measurement and enhance disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. GAAP clarifies the definition of fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. An asset’s or liability’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The three levels are defined as follows:
	Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market for the asset or liability, for substantially the full term of the financial instrument.
	Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement and based on the Company’s own assumptions about market participants’ assumptions.
	The following table presents a summary of financial assets and liabilities measured at fair value at September 30, 2013 and September 30, 2012:
			Level 1			Level 2			Level 3		Total		Total
													Losses
	September 30, 2013
	Securities available for sale:
	Mortgage-backed securities invested in Government Agencies		$	—		$	4,021,365		$	—	$	4,021,365	$	—
	Collateralized mortgage obligations invested in Government Agencies						529,739					529,739		—
	State and Municipal Securities						1,240,621					1,240,621
	Impaired loans			—			—			972,787		972,787		—
	Foreclosed assets									20,000		20,000	$	16,781
	September 30, 2012
	Securities available for sale:
	Mortgage-backed securities invested in Government Agencies		$	—		$	5,979,683		$	—	$	5,979,633	$	—
	Collaterialized mortgage obligations invested in Government Agencies			—			1,823,892			—		1,823,892		—
	Impaired loans			—			—			940,717		940,717		—
	Foreclosed assets			—						295,750		295,750		—
	In accordance with generally accepted accounting principles concerning accounting for Loan and Lease Losses, losses of $16,781 and $0 for the years ended September 30, 2013 and September 30, 2012, respectively, were recognized as a charge to the Allowance for Loan and Lease Losses at the time the foreclosed assets were acquired based on an independent appraisal of the property’s fair value.
	The methods and assumptions used to estimate the fair values, including items in the above tables, are included in the disclosures that follow.
	Cash and Cash Equivalents (Carried at Cost). The carrying amounts of cash and cash equivalents approximate fair value.
	Certificates of Deposit (Carried at Cost). The carrying amounts of certificates of deposit approximate fair value.
	Securities Available for Sale (Carried at Fair Value). Where quoted prices are available in an active market, securities available for sale are classified within Level 1 of the valuation hierarchy. Level 1 would include highly liquid government bonds, mortgage products and exchange-traded equities. If quoted market prices are not available, securities available for sale are classified within level 2 and fair value values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flow. Level 2 would include U.S. agency securities, mortgage-backed securities, obligations of states and political subdivisions and certain corporate, asset-backed and other securities. In certain cases where there is limited activity or less transparency around inputs to the valuation, securities are classified within Level 3 of the valuation hierarchy.
	Federal Home Loan Bank Stock (Carried at Cost). The carrying amount of Federal Home Loan Bank stock approximates fair value, and considers the limited marketability of such securities.
	Loans Receivable (Carried at Cost). The fair values of loans are estimated using discounted cash flow analyses, using market rates at the statement of condition 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 with no significant change in credit risk, fair values are based on carrying values.
	Impaired Loans (Generally Carried at Fair Value). Loans are designated as impaired when, in the judgment of management based on current information and events, it is probable that all amounts due according to the contractual terms of the loan agreement will not be collected. Impaired loans are measured at an observable market price (if available), or at fair value of the loan’s collateral (if the loan is collateral dependent). When the loan is dependent on collateral, fair value of collateral is determined by appraisal or independent valuation, which is then adjusted for the related cost to sell. Impaired loans allocated to the Allowance for Loan and Lease Losses are measured at the lower of cost or fair value on a nonrecurring basis.
	Foreclosed Assets (Carried at Lower of Cost or Fair Value Less Estimated Selling Costs). Fair values of foreclosed assets are measured at fair value less cost to sell. The valuation of the fair value measurement follows GAAP. Foreclosed assets are measured on a nonrecurring basis.
	Deposit Liabilities (Carried at Cost). The fair values disclosed for demand deposits (e.g., interest and non-interest checking, passbook savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). Fair value for certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered in the market on certificates to a schedule of aggregated expected monthly maturities.
	Federal Home Loan Bank Advances (Carried at Cost). Fair values of FHLB advances are estimated using discounted cash flows analysis, based on quoted prices for new FHLB advances with similar credit risk characteristics, terms and remaining maturity. These prices obtained from this active market represent a market value that is deemed to represent the transfer price if the liability were assumed by a third party.
	Accrued Interest Receivable and Payable (Carried at Cost). The carrying amounts of accrued interest approximate fair value.
	Off Balance Sheet Credit-Related Instruments (Disclosures at Cost). Fair values for off balance-sheet financial instruments (lending commitments and letters of credit) are based on fees currently charged in the market to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The fair value of these instruments is not material.
	The following table presents quantitative information about Level 3 Fair Value Measurements for certain financial assets measured at fair value on a non-recurring basis for September 30, 2013 and September 30, 2012:
			Quantitative Information about Level 3 Fair Value Measurements for
			September 30, 2013 and September 30, 2012
			Valuation Techniques		Unobservable Input	Range
	Assets:
	Impaired loans		Discounted appraised value		Selling costs	6-12%
	Foreclosed assets		Discounted appraised value		Selling costs	6-12%
	The following table presents a reconciliation of the beginning and ending balances for Level 3 assets;
			Impaired Loans			Foreclosed Assets
	Balance, September 30, 2011			717,648			884,000
	Purchases, settlements and charge-offs			(230,000	)		(588,250	)
	Transfers in and/or out of Level 3			453,069			—
	Balance, September 30, 2012			940,717			295,750
	Purchases, settlements and charge-offs			(294,140	)		(295,750	)
	Transfers in and/or out of Level 3			326,210			20,000
	Balance, September 30, 2013		$	972,787		$	295,750
	The estimated fair values of the Company’s financial instruments were as follows:
						Fair Value Measurements at September 30, 2013 Using
			Carrying			Quoted			Significant		Significant		Fair
			Value			Prices in			Other		Unobservable		Value
						Active			Observable		Inputs
						Market for			Inputs		(Level 3)
						Identical			(Level 2)
						Assets
						(Level 1)
			(in thousands)
	Financial assets:
	Cash and cash equivalents		$	3,851		$	3,851		$	—	$	—	$	3,851
	Certificates of deposit			3,784			3,784			—		—		3,784
Securities available for sale			5,792			—			5,792		—		5,792
Securities held to maturity			3,756			—			3,603		—		3,603
Federal Home Loan Bank stock			454			—			454		—		454
Loans receivable, net			55,375			—			55,058		973		56,031
Foreclosed real estate			20			—			—		20		20
Accrued interest receivable			233			—			233		—		233
Financial liabilities:
Deposits			55,930			—			56,178		—		56,178
Federal Home Loan Bank advances			8,000			—			8,698		—		8,698
Accrued interest payable			43			—			43		—		43
Off-Balance sheet financial instruments			—			—					—		—
					Fair Value Measurements at September 30, 2012 Using
		Carrying			Quoted			Significant		Significant		Fair
		Value			Prices in			Other		Unobservable		Value
					Active			Observable		Inputs
					Market for			Inputs		(Level 3)
					Identical			(Level 2)
					Assets
					(Level 1)
		(in thousands)
Financial assets:
Cash and cash equivalents		$	4,363		$	4,363		$	—	$	—	$	4,363
Securities available for sale			3,532			3,532			—		—		3,532
Securities held to maturity			7,804			—			7,804		—		7,804
Federal Home Loan Bank stock			3,637			—			3,804		—		3,804
Loans receivable, net			480			—			480		—		480
Foreclosed real estate			54,650			—			54,580		941		55,521
Accrued interest receivable			296			—			—		296		296
Financial liabilities:			290			—			290		—		290
Deposits			58,026			—			58,064		—		58,064
Federal Home Loan Bank advances			8,000			—			8,987		—		8,987
Accrued interest payable			43			—			43		—		43
Off-Balance sheet financial instruments			—			—			—		—		—

Financial_Instruments_with_Off

Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Sep. 30, 2013
Financial Instruments with Off-Balance Sheet Risk	'
	Note 19.	Financial Instruments with Off-Balance Sheet Risk
	The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to originate loans. These loans involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized on the balance sheet.
	The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments is represented by the contractual amount of these instruments. The Company uses the same credit policies for these instruments as it does for on-balance sheet instruments.
	The commitment to originate loans is an agreement to lend to a customer provided there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates and may require the payment of a fee. The Company expects that a large majority of its commitments will be fulfilled subsequent to the balance sheet date and therefore, represent future cash requirements.
	The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower.
	Loan commitments representing off-balance sheet risk at September 30, 2013 and 2012 were as follows:
			Contract or Notional Amount
			2013		2012
	Mortgage loan commitments-fixed rate (3.00% - 7.75%)		$	—	$	850,500
	Unused lines of credit			3,686,945		1,725,628
	Available home equity lines of credit			1,845,383		2,187,617
	Standby letters of credit			121,466		216,997
			$	5,653,794	$	4,980,742

Earnings_per_Share

Earnings per Share	12 Months Ended
	Sep. 30, 2013
Earnings per Share	'
	Note 20.	Earnings per Share
	Earnings per common share on income before extraordinary income is computed by dividing income before extraordinary item by the weighted average number of common shares outstanding during the period and the earnings per share on the extraordinary items is computed by dividing the extraordinary item by the weighted average number of common shares outstanding during the period. Weighted average shares excludes unallocated ESOP shares and unearned RRP shares. Basic earnings per share excludes dilution and is computed by dividing net income by the basic weighted average number of common shares outstanding during the period. Dilutive earnings per share reflects the potential dilution that could occur if stock options were exercised and is computed by dividing net income by the dilutive weighted average number of common shares outstanding during the period.
			September 30,		September 30,
			2013		2012
	Income before extraordinary item		$	257,470	$	326,292
	Extraordinary item, gain on business combination			—		1,022,074
	Net income		$	257,470	$	1,348,366
	Weighted average number of shares used in:
	Basic earnings per share			445,643		472,278
	Dilutive common stock equivalents:
	Stock options			11,139		6,441
	Dilutive earnings per share			456,782		478,719
	Basic and dilutive earnings per common share:
	Income before extraordinary item, basic		$	0.58	$	0.69
	Extraordinary item, gain on business combination, basic			—		2.17
	Net income, basic		$	0.58	$	2.86
	Income before extraordinary item, dilutive		$	0.56	$	0.68
	Extraordinary item, gain on business combination, dilutive			—		2.14
	Net income, dilutive		$	0.56	$	2.82

Parent_Company_Only_Financial_

Parent Company Only Financial Statements	12 Months Ended
	Sep. 30, 2013
Parent Company Only Financial Statements	'
	Note 21.	Parent Company Only Financial Statements
	Presented below are the condensed balance sheet, statement of operations and statement of cash flows for Fairmount Bancorp, Inc. for the year ended September 30, 2013.
	CONDENSED BALANCE SHEET
			September 30,			September 30,
			2013			2012
	Assets:
	Cash and due from bank		$	221,881		$	378,404
	Certificates of deposit			1,030,436			1,025,167
	Investment in bank subsidiary			11,408,505			11,079,179
	Loans receivable			324,704			368,549
	Other assets			26,953			28,740
	Total assets		$	13,012,479		$	12,880,039
	Liabilities and Stockholders’ Equity
	Liabilities:
	Accounts payable			9,250			24,849
	Total liabilities			9,250			24,849
	Stockholders’ Equity
	Preferred stock, $0.01 par value; authorized 1,000,000; none issue			—			—
	Common stock, $0.01 par value; authorized 4,000,000; 500,314 issued; 477,514 and 477,514 shares outstanding at September 30, 2013 and 2012, respectively			5,003			5,003
	Additional paid in capital			4,040,748			3,854,869
	Unearned common stock held by:
	Employee Stock Ownership Plan			(209,736	)		(251,607	)
	Recognition and Retention Plan			(245,145	)		(162,271	)
	Retained earnings			9,334,634			9,077,164
	Accumulated other comprehensive income			77,725			206,929
	Total stockholders’ equity			13,003,229			12,855,190
	Total liabilities and stockholders’ equity		$	13,012,479		$	12,880,039
	CONDENSED STATEMENT OF OPERATIONS
			Year Ended			Year Ended
			September 30,			September 30,
			2013			2012
	Interest income on loans		$	16,873		$	18,910
	Interest and dividends on investments			5,722			10,273
	Total income			22,595			29,183
	Operating expenses			97,036			111,563
	Loss before equity in net income of bank subsidiary			(74,441	)		(82,380	)
	Income tax benefits			25,310			28,009
	Net loss before equity in net income of bank subsidiary			(49,131	)		(54,371	)
	Equity in net income of bank subsidiary			306,601			1,402,737
	Net income		$	257,470		$	1,348,366
	CONDENSED STATEMENT OF CASH FLOWS
			Year Ended			Year Ended
			September 30,			September 30,
			2013			2012
	Cash flows from operating activities:
	Net loss		$	(49,131	)	$	(54,371	)
	Adjustments to reconcile net loss to net cash provided (used) by operating activities:
	Equity in net income of subsidiary			306,601			1,402,737
	Compensation cost on allocated ESOP shares			71,676			59,750
	Compensation cost on allocated RRP shares and stock options			81,177			—
	(Increase) decrease in other assets			1,787			9,602
	Increase (decrease) in other liabilities			(15,599	)		17,349
	Net cash provided (used) by operating activities			396,511			1,435,067
	Cash flow from investing activities:
	(Increase) decrease in loans			43,845			49,510
	Investment in bank subsidiary			(458,530	)		(1,382,009	)
	Net cash provided (used) by investing activities			(414,685	)		(1,332,499	)
	Cash flows from financing activities:
	Proceeds from issuance of common stock, net of costs			—			351,573
	Net increase in interest-bearing deposits			(5,269	)		(8,051	)
	Repurchase of common stock			(133,080	)		(389,240	)
	Net cash provided (used) by financing activities			(138,349	)		(45,718	)
	Net increase (decrease) in cash and cash equivalents			(156,523	)		56,850
Cash and cash equivalents, beginning balance			378,404			321,554
Cash and cash equivalents, ending balance		$	221,881		$	378,404
Supplemental schedule of noncash financing activities:
On October 13, 2011, the Company loaned $63,478 to the ESOP which was used to acquire 4,502 shares of common stock. The loan is secured by the shares purchased and is shown as Unearned ESOP shares in the consolidated balance sheets.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2013
Nature of Operations	'
	Nature of Operations
	Fairmount Bancorp, Inc., a Maryland corporation (the “Company”) was incorporated on November 30, 2009, to serve as the holding company for Fairmount Bank (the “Bank”), a federally chartered savings bank. On June 2, 2010, in accordance with a Plan of Conversion adopted by its Board of Directors and approved by its members, the Bank converted from a federal mutual savings bank to Maryland state chartered commercial bank and become the wholly owned subsidiary of the Company. The conversion was accomplished through the sale and issuance of 444,038 shares of common stock at a price of $10.00 per share, through which the Company received proceeds of approximately $3,742,000, net of offering expenses of approximately $699,000. Approximately 50% of the net proceeds of the offering, or $1,900,000, were contributed by the Company to the Bank in return for 100% of the issued and outstanding shares of common stock of the Bank. In connection with the conversion, the Bank’s Board of Directors adopted an employee stock ownership plan (the “ESOP”) which subscribed for 8% of the sum of the number of shares, or 35,523 shares of common stock sold in the offering.
	On October 12, 2011, the Company completed the acquisition of Fullerton Federal Savings Association (“Fullerton”) in a conversion merger transaction. In connection with the acquisition and pursuant to the terms of the Agreement and Plan of Conversion Merger and the related Plan of Conversion Merger, the Company issued and sold 56,276 shares of common stock at a price of $14.10 per share, through which the Company received proceeds of approximately $452,000, net of offering expenses of $341,000. The shares were sold in a subscription offering to depositors of Fullerton and to the Company’s Employee Stock Ownership Plan and in a community offering to the Company’s Recognition and Retention Plan (the “RRP”) and to the general public. The amount of common stock offered for sale was based on an independent valuation of Fullerton.
	In accordance with the Office of the Commissioner of Financial Regulation of the State of Maryland regulations, upon the completion of the conversion, the Bank restricted retained earnings by establishing a liquidation account. The liquidation account will be maintained for the benefit of eligible account holders who continue to maintain their accounts at the Bank after conversion. The liquidation account will be reduced annually to the extent that eligible account holders have reduced their qualifying deposits. Subsequent increases will not restore an eligible account holder’s interest in the liquidation account. In the event of a complete liquidation of the Bank, and only in such event, each account holder will be entitled to receive a distribution from the liquidation account in an amount proportionate to the adjusted qualifying account balances then held. The Bank may not pay dividends if those dividends would reduce equity capital below the required liquidation account amount.
	Fairmount Bank is a community-oriented commercial bank, which provides a variety of financial services to individuals and corporate customers through its home Baltimore County, Maryland, and is subject to competition from other financial institutions. The Bank’s primary deposit products are interest-bearing savings, certificates of deposit, and individual retirement accounts. The Bank’s primary lending products are single-family residential mortgage loans. The Bank is subject to the regulations of certain Federal agencies and undergoes periodic examinations by those regulatory authorities. The accounting policies of the Bank conform to accounting principles generally accepted in the United States of America and general practices within the banking industry.
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements include the accounts of Fairmount Bancorp, Inc., its wholly owned subsidiary Fairmount Bank. Material intercompany accounts and transactions have been eliminated in consolidation.
Estimates	'
	Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for losses on loans and leases and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. In connection with the determination of the allowances for losses on loans and leases and foreclosed real estate, management obtains independent appraisals for significant properties.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash and balances due from banks, interest-bearing deposits in other banks, certificates of deposit less than one year and federal funds sold.
Securities	'
	Securities
	Management determines the appropriate classification of debt securities at the time of purchase and re-evaluates such designation as of each balance sheet date.
	Securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and are reported at amortized cost (including amortization of premium or accretion of discount).
	Securities classified as available for sale are those securities that the Company intends to hold for an indefinite period of time but not necessarily to maturity. Securities available for sale are carried at fair value. Unrealized gains and losses are reported as increases or decreases in other comprehensive income. Realized gains and losses, determined on the basis of the cost of the specific securities sold, are included in earnings. Premiums and discounts are recognized in interest income using a method which approximates the interest method over the terms of the securities. Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary, if any, are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, management considers (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.
Federal Home Loan Bank Stock	'
	Federal Home Loan Bank Stock
	Federal Home Loan Bank of Atlanta (the “FHLB”) stock is an equity interest in the FHLB, which does not have a readily determinable fair value for purposes of Generally Accepted Accounting Standards related to Accounting for Certain Investments in Debt and Equity Securities, because its ownership is restricted and it lacks a market. FHLB stock can be sold back only at par value of $100 per share and only to the FHLB or another member institution. As of September 30, 2013 and 2012, the Company owned shares totaling $453,700 and $479,700, respectively.
	The Company evaluates the FHLB stock for impairment in accordance with generally accepted accounting principles. The Company’s determination of whether this investment is impaired is based on an assessment of the ultimate recoverability of its cost rather than by recognizing temporary declines in value. The determination of whether a decline in value affects the ultimate recoverability of its cost is influenced by criteria such as (1) the significance of the decline in net assets of the FHLB as compared to the capital stock amount for the FHLB and the length of time this situation has persisted, (2) commitments by the FHLB to make payments required by law or regulation and the level of such payments in relation to the operating performance of the FHLB, and (3) the impact of legislative and regulatory changes on institutions and accordingly on the customer base of the FHLB.
Loans	'
	Loans
	Loans are generally carried at the amount of unpaid principal, less the allowance for loan losses and adjusted for deferred loan fees, which are amortized over the term of the loan using the interest method. Interest on loans is accrued based on the principal amounts outstanding. It is the Company’s policy to discontinue the accrual of interest when a loan is specifically determined to be impaired or when the principal or interest is delinquent for 90 days or more. When a loan is placed on nonaccrual status, all interest previously accrued but not collected is reversed against current period interest income. Interest income generally is not recognized on specific impaired loans unless the likelihood of further loss is remote. Cash collections on such loans are applied as reductions of the loan principal and no interest income is recognized on those loans until the principal balance has been collected. The carrying value of impaired loans is based on the present value of the loan’s expected future cash flows or, alternatively, the observable market price of the loan or the fair value of the collateral. The loan may be returned to accrual status if unpaid principal and interest are paid so that the loan is brought current and performing according to the contractual terms of the loan.
	When a loan is 15 days past due, the Company will send the borrower a late notice. The Company also contacts the borrower by phone if the delinquency is not corrected promptly after the notice has been sent. When the loan is 30 days past due, the Company will send the borrower a letter reminding the borrower of the delinquency, and attempts to contact the borrower personally to determine the reason for the delinquency in order to ensure that the borrower understands the terms of the loan and the importance of making payments on or before the due date. If necessary, subsequent delinquency notices are issued and the account will be monitored on a regular basis thereafter. By the 90th day of delinquency, the Company will send the borrower a final demand for payment and may recommend foreclosure. Loans are charged off when the Company believes that the recovery of principal is improbable. A summary report of all loans 30 days or more past due is provided to the board of directors of the Company each month.
Allowance for Loan and Lease Losses	'
	Allowance for Loan and Lease Losses
	The allowance for loan losses is established through a provision for loan losses. The Company maintains the allowance at a level believed, to the best of management’s knowledge, to cover all known and inherent losses in the portfolio that are both probable and reasonable to estimate at each reporting date. Subsequent recoveries, if any, are credited to the allowance.
	The allowance for loan losses is evaluated on no less than a quarterly basis in order to identify those inherent losses and to assess the overall collection probability for the loan portfolio. The evaluation process by portfolio segment includes, among other things, an analysis of delinquency trends, non-performing loan trends, the level of charge-offs and recoveries, prior loss experience, total loans outstanding, the volume of loan originations, the type, size and geographic concentration of the loans, the value of collateral securing the loan, the borrower’s ability to repay and repayment performance, the number of loans requiring heightened management oversight, local economic conditions and industry experience.
	The establishment of the allowance for loan losses is significantly affected by management’s judgment and uncertainties, and there is a likelihood that different amounts would be reported under different conditions or assumptions. The Office of the Commissioner of Financial Regulation of the State of Maryland as an integral part of its examination process, periodically reviews the allowance for loan losses and may require the Company to make additional provisions for estimated loan losses based upon judgments different from those of management.
	The Company’s policies, consistent with regulatory guidelines, provide for the classification of loans and other assets that are considered to be of lesser quality as substandard, doubtful, or loss assets. An asset is considered substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard assets include those assets characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Assets (or portions of assets) classified as loss, are those considered uncollectible and of such little value that there continuance as assets is not warranted. Assets that do not expose us to risk sufficient to warrant classification in one of the aforementioned categories, but which possess potential weaknesses that deserve close attention, are required to be designated as special mention.
	A loan is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Impairment is measured on a loan by loan basis by either 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.
	Loans may be periodically modified in a troubled debt restructuring (TDR) to make concessions to help a borrower remain current on the loan and to avoid foreclosure. Generally we do not forgive principal or interest on a loan or modify the interest rate on loans that are below market rates. When we modify loans in a TDR, we evaluate any possible impairment similar to other impaired loans. If we determine that the value of the modified loan is less than the recorded investment in the loan, impairment is recognized through a specific allowance estimate or a charge-off to the allowance.
	The allowance consists of specific, general, and unallocated components. The specific component relates to loans that are classified as doubtful, substandard, or special mention. For such loans that are also classified as impaired, a specific allowance is established for that portion of the loan that is deemed uncollectible. The general component covers non-classified loans and is based on historical loss experience adjusted for qualitative factors. An unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. Determinations as to the classification of assets and the amount of loss allowances are subject to review by our principal federal regulator, the Office of the Commissioner of Financial Regulation for the State of Maryland, which can require that we establish additional loss allowances. The Company regularly reviews its asset portfolio to determine whether any assets require classification in accordance with applicable regulations.
	The Company maintains the allowance for loan and lease losses at a level considered adequate to provide for losses inherent in the loan portfolio. While the Company utilizes available information to recognize losses on loans, future additions to the allowances for loan and lease losses may be necessary based on changes in economic conditions, particularly in its’ market area in the state of Maryland. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for loan and lease losses. Such agencies may require the Company to recognize additions to the allowance for loan and lease losses based on their judgments about information available to them at the time of their examination.
	Actual loan losses may be significantly more than the allowance for loan and lease losses the Company has established, which could have a material negative effect on its financial statements.
Premises and Equipment	'
	Premises and Equipment
	Land is carried at cost. Property and equipment is carried at cost less accumulated depreciation. Depreciation is computed on the straight-line method over estimated useful lives of assets. When assets are retired or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts, and any resulting gain or loss is recognized in income for the period. The cost of maintenance and repairs is charged to expense as incurred; significant renewals and betterments are capitalized.
Foreclosed Assets	'
	Foreclosed Assets
	Assets acquired through, or in lieu of, foreclosure is initially recorded at the lower of cost (principal balance of the former mortgage loan plus costs of obtaining title and possession) or fair value at the date of acquisition. Costs relating to development and improvement of property are capitalized, whereas costs relating to the holding of property are expensed.
	Management periodically performs valuations, and an allowance for losses is established by a charge to operations if the carrying value of a property exceeds its estimated net realizable value.
Income Taxes	'
	Income Taxes
	The Company accounts for income taxes in accordance with income tax accounting guidance in ASC Topic 740. The income tax accounting guidance results in two components of income tax expense – current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to taxable income or loss. Deferred taxes are provided for the temporary differences between the tax basis and the financial basis of the Company’s assets and liabilities. Deferred tax assets and liabilities are determined based on the enacted rates that are expected to be in effect when the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized. Deferred tax expense or benefit is the result of the changes in the deferred tax assets and liabilities.
	Fairmount Bancorp, Inc. has entered into a tax sharing agreement with Fairmount Bank. The agreement provides that Fairmount Bancorp, Inc. will file a consolidated federal tax return, and that the tax liability shall be apportioned among the entities as would be computed if each entity had filed a separate return. According to Maryland tax law, Fairmount Bancorp, Inc. and Fairmount Bank file separate Maryland state tax returns.
Common Stock Repurchase Program	'
	Common Stock Repurchase Program
	The Company adopted a common stock repurchase program in which shares repurchased reduce the amount of shares issued and outstanding. The repurchased shares may be reissued in connection with share-based compensations plans and for general corporate purposes. Under this plan, the Company approved the repurchase of a specific amount of shares and will extend over a period of six months beginning September 10, 2013. The common stock repurchase program began in September 2012 and was completed in February 2013.
Comprehensive Income (Loss)	'
	Comprehensive Income (Loss)
	Accounting principles generally accepted in the United States of America require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities, are reported as a separate component of equity, such items, along with net income, are components of comprehensive income.
Off-Balance Sheet Financial Instruments	'
	Off-Balance Sheet Financial Instruments
	In the ordinary course of business, the Bank has entered into off-balance sheet financial instruments consisting of commitments to extend credit. These loans involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized on the balance sheet. Such financial instruments are recorded in the statement of income when they are funded.
	The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments is represented by the contractual amount of these instruments. The Company uses the same credit policies for these instruments as it does for the on-balance sheet instruments.
Advertising Costs	'
	Advertising Costs
	Advertising costs are expensed as incurred. For the years ended September 30, 2013 and 2012, advertising expense was $1,746 and $13,687 respectively.
Concentrations of Credit Risk	'
	Concentrations of Credit Risk
	The Company has approximately $2,750,000 and $3,512,000, in deposits in other financial institutions in excess of amounts insured by the Federal Deposit Insurance Corporation (“FDIC”), as of September 30, 2013 and September 30, 2012, respectively. The Company’s management considers this a normal business risk. The Company also maintains accounts with stock brokerage firms containing securities. These balances are insured up to $500,000 by the Securities Investor Protection Corporation. The Company was required to maintain a $100,000 minimum balance in a deposit account with Maryland Financial as of September 30, 2013 and 2012, in relation to a sweep account.
	Most of the Company’s activities are with customers in the Maryland counties of Baltimore and Harford and portions of the City of Baltimore. Notes 1, 4, and 5 discuss the types of activities and lending the Company engages in. The Bank does not have any significant concentrations in any one industry or customer.
Subsequent Events	'
	Subsequent Events
	The company has evaluated events and transactions subsequent to September 30, 2013 through the date these financial statements were issued. Based on definitions and requirements of Generally Accepted Accounting Principles for “Subsequent Events,” the Company has not identified any events that would require adjustments to, or disclosure in the financial statements.
Reclassification	'
	Reclassifications
	Certain prior year amounts have been reclassified to conform to the current year’s method of presentation. Such reclassifications have no effect on net income.

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Sep. 30, 2013
Carrying Value of Fullerton's Assets and Liabilities Adjusted to Reflect Fair Value	'
	The Company recorded the following assets and liabilities as of October 12, 2011. These amounts represent the carrying value of Fullerton’s assets and liabilities adjusted to reflect the fair value at the date of the acquisition. The discounts and premiums resulting from the fair value adjustments will be accreted and amortized on a level yield basis over the anticipated lives of the underlying financial assets or liabilities. This amortization of premiums and discounts is not expected to have a material impact on the Company’s results of operations on future periods.
		Assets Acquired
	Assets
	Cash and cash equivalents	$	4,224,279
	Securities available for sale		827,139
	Loans receivable		2,414,712
	Federal Home Loan Bank stock, at cost		15,300
	Premises and equipment		887,503
	Other assets		174,579
	Total assets acquired	$	8,543,512
		Liabilities Assumed
	Liabilities
	Deposits	$	7,333,130
	Other liabilities		77,427
	Total liabilities assumed	$	7,410,557

Securities_Tables

Securities (Tables)	12 Months Ended
	Sep. 30, 2013
Amortized Cost and Estimated Market Value of Securities Classified as Available for Sale and Held to Maturity	'
	The amortized cost and estimated fair value of securities classified as available for sale and held to maturity at September 30, 2013 and 2012, are as follows:
		September 30, 2013
		Amortized		Gross		Gross		Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities	$	3,855,067	$	166,298	$	—	$	4,021,365
	Collateralized Mortgage Obligations		535,148				5,409		529,739
	State and Municipal Securities		1,273,145		—		32,524		1,240,621
	Total securities available for sale	$	5,663,360	$	166,298	$	37,933	$	5,791,725
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations	$	3,756,238	$	4,991	$	158,526	$	3,602,703
		September 30, 2012
		Amortized		Gross		Gross		Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities	$	5,629,774	$	349,909	$	—	$	5,979,683
	Collateralized Mortgage Obligations		1,832,052		538		8,698		1,823,892
	Total securities available for sale	$	7,461,826	$	350,447	$	8,698	$	7,803,575
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations	$	1,999,145	$	11,784	$	—	$	2,010,929
	State and Municipal Securities		1,637,827		155,142		—		1,792,969
	Total securities held to maturity	$	3,636,972	$	166,926	$	—	$	3,803,898
Securities with Gross Unrealized Losses Aggregated by Investment Category and Length of Time That Individual Securities Have Been in Continuous Loss Position	'
	Securities with gross unrealized losses at September 30, 2013 and 2012 aggregated by investment category and length of time that individual securities have been in a continuous loss position are as follows:
		30-Sep-13
		Less than 12 Months				12 Months or Greater				Total
		Fair		Gross		Fair		Gross		Fair		Gross
		Value		Unrealized		Value		Unrealized		Value		Unrealized
				Losses				Losses				Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities	$	—	$	—	$	—	$	—	$	—	$	—
	Collateralized Mortgage Obligations		—		—		529,739		5,409		529,739		5,409
	State and Municipal Securities		1,240,621		32,524		—		—		1,240,621		32,524
		$	1,240,621	$	32,524	$	529,739	$	5,409	$	1,770,360	$	37,933
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations	$	2,849,720	$	158,526					$	2,849,720	$	158,526
	State and Municipal Securities		—		—		—		—		—		—
		$	2,849,720	$	158,526	$	—	$	—	$	2,849,720	$	158,526
		30-Sep-12
		Less than 12 Months				12 Months or Greater				Total
		Fair		Gross		Fair		Gross		Fair		Gross
		Value		Unrealized		Value		Unrealized		Value		Unrealized
				Losses				Losses				Losses
	Securities Available for Sale
	Residential Mortgage-Backed Securities	$	—	$	—	$	—	$	—	$	—	$	—
	Collateralized Mortgage Obligations		1,435,900		8,698		—		—		1,435,900		8,698
		$	1,435,900	$	8,698	$	—	$	—	$	1,435,900	$	8,698
	Securities Held to Maturity
	U.S. Government and Federal Agency Obligations		—	$	—	$	—	$	—	$	—	$	—
	State and Municipal Securities		—		—		—		—		—		—
		$	—	$	—	$	—	$	—	$	—	$	—
Available-for-sale Securities	'
Amortized Cost and Estimated Market Value of Securities, by Contractual Maturity	'
	The amortized cost and estimated fair value of securities as of September 30, 2013, 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.
		September 30, 2013
		Securities Available for Sale				Securities Held to Maturity
		Amortized		Fair		Amortized		Fair
		Cost		Value		Cost		Value
	Due in one year or less	$	—	$	—	$	—	$	—
	Due after one year through five years		550,169		549,536		1,740,850		1,724,203
	Due five years to ten years		490,391		475,290		2,015,388		1,878,500
	Due after ten years		4,622,800		4,766,899		—		—
		$	5,663,360	$	5,791,725	$	3,756,238	$	3,602,703
Loans Receivable	'
Amortized Cost and Estimated Market Value of Securities, by Contractual Maturity	'
	Loans and their remaining contractual maturities at September 30, 2013, were as follows:
		Maturities
	One year or less	$	3,095,533
	After one year to five years		7,595,647
	After five years to ten years		17,055,071
	After ten years to fifteen years		7,862,923
	After fifteen years		20,572,728
		$	56,181,902
Certificates of Deposit	'
Amortized Cost and Estimated Market Value of Securities, by Contractual Maturity	'
	Certificates of deposit and their remaining maturities at September 30, 2013, are as follows:
	2014	$	17,425,755
	2015		8,782,333
	2016		2,751,064
	2017		2,176,707
	2018		3,306,510
		$	34,442,369

Loans_and_Allowance_for_Loan_a1

Loans and Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Sep. 30, 2013
Principal Categories of Loan Portfolio	'
	The principal categories of the loan portfolio at September 30, 2013 and 2012 were as follows:
		2013			2012
	Real estate loans
	One-to four-family owner occupied	$	26,363,952		$	26,097,798
	One-to four-family non-owner occupied		17,480,953			17,855,304
	Home equity		2,243,716			2,172,247
	Mobile home		1,785,854			2,068,672
	Secured by other properties		2,783,794			2,613,025
	Construction and land development		3,911,156			3,262,452
	Total real estate loans		54,569,425			54,069,498
	Other loans
	Secured commercial		1,603,318			1,212,534
	Savings		9,159			10,290
	Total other loans		1,612,477			1,222,824
	Total loans		56,181,902			55,292,322
	Unamortized premiums and loan fees		250,880			319,713
	Unearned income on loans		(323,966	)		(344,450	)
	Allowance for loan and lease losses		(733,451	)		(617,474	)
	Total loans, net	$	55,375,365		$	54,650,111
Loans to Officers, Directors and Related Affiliates	'
	Loans to officers, directors and related affiliates at September 30, 2013 and 2012, were as follows:
		2013			2012
	Balance, beginning of year	$	485,531		$	513,789
	Additions		214,902			—
	Repayments		(27,113	)		(28,258	)
	Balance, end of year	$	673,320		$	485,531

Credit_Quality_of_Financing_Re1

Credit Quality of Financing Receivables and the Allowance for Loan Losses (Tables)	12 Months Ended
	Sep. 30, 2013
Balance of Allowance for Loan Losses	'
	The allowance for loan losses allocated to each portfolio segment is not necessarily indicative of future losses in any particular portfolio segment and does not restrict the use of the allowance to absorb losses in other portfolio segments.
		As of September 30, 2013
		One-to				One-to				Mobile			Secured by			Construction			Other			Unallocated			Total
		Four-Family				Four-Family				Home			Other			and Land			Loans
		Owner				Non-Owner							Properties			Development
		Occupied				Occupied
	Allowance for Credit Losses:
	Beginning Balance	$	85,217			$	273,683			$	95,613		$	30,442		$	80,327		$	3,057		$	49,135		$	617,474
	Charge-offs		—				(363,842	)			(23,921	)		—			—			—			—			(387,763	)
	Recoveries		—				3,740				—			—			—			—			—			3,740
	Provision		(4,654	)			562,003				9,251			(8,077	)		(49,522	)		974			(9,975	)		500,000
	Ending Balance	$	80,563			$	475,584			$	80,943		$	22,365		$	30,805		$	4,031		$	39,160		$	733,451
	Ending balance: individually evaluated for impairment	$	—			$	201,267			$	488		$	—		$	—		$	—		$	—		$	201,755
	Ending balance: collectively evaluated for impairment	$	80,563			$	274,317			$	80,455		$	22,365		$	30,805		$	4,031		$	39,160		$	531,696
	Ending balance: loans acquired with deteriorated credit quality	$	—			$	—			$	—		$	—		$	—		$	—		$	—		$	—
	Financing receivables:
	Ending balance	$	28,607,668			$	17,480,953			$	1,785,854		$	2,783,794		$	3,911,156		$	1,612,477					$	56,181,902
	Ending balance: individually evaluated for impairment	$	436,317			$	1,635,383			$	105,940		$	213,099		$	370,411		$	—					$	2,761,150
	Ending balance: collectively evaluated for impairment	$	27,780,213			$	15,845,570			$	1,679,914		$	2,570,695		$	3,540,745		$	1,612,477					$	53,029,614
	Ending balance: loans acquired with deteriorated credit quality	$	391,138			$	—			$	—		$	—		$	—		$	—					$	391,138
		As of September 30, 2012
		One-to				One-to				Mobile			Secured by			Construction			Other			Unallocated			Total
		Four-Family				Four-Family				Home			Other			and Land			Loans
		Owner				Non-Owner							Properties			Development
		Occupied				Occupied
	Allowance for Credit Losses:
	Beginning Balance	$	64,547			$	382,023			$	52,719		$	25,702		$	91,135		$	3,907		$	45,256		$	665,289
	Charge-offs		(72,815	)			(175,000	)			—			—			—			—			—			(247,815	)
	Recoveries		—				—				—			—			—			—			—			—
	Provision		93,485				66,660				42,894			4,740			(10,808	)		(850	)		3,879			200,000
	Ending Balance	$	85,217			$	273,683			$	95,613		$	30,442		$	80,327		$	3,057		$	49,135		$	617,474
	Ending balance: individually evaluated for impairment	$	—			$	30,901			$	36,517		$	—		$	—		$	—		$	—		$	67,418
	Ending balance: collectively evaluated for impairment	$	85,217			$	242,782			$	59,096		$	30,442		$	80,327		$	3,057		$	49,135		$	550,056
	Ending balance: loans acquired with deteriorated credit quality	$	—			$	—			$	—		$	—		$	—		$	—		$	—		$	—
	Financing receivables:
	Ending balance	$	28,270,045			$	17,855,304			$	2,068,672		$	2,613,025		$	3,262,452		$	1,222,824					$	55,292,322
	Ending balance: individually evaluated for impairment	$	437,872			$	1,577,271			$	152,256		$	216,000		$	—		$	—					$	2,383,399
	Ending balance: collectively evaluated for impairment	$	27,434,223			$	16,278,033			$	1,916,416		$	2,397,025		$	3,262,452		$	1,222,824					$	52,510,973
	Ending balance: loans acquired with deteriorated credit quality	$	397,950			$	—			$	—		$	—		$	—		$	—					$	397,950
Summary of Loan Portfolio Quality Indicators by Loan Class Recorded Investment	'
	The following tables are a summary of the loan portfolio quality indicators by loan class recorded investment as of September 30, 2013 and September 30, 2012:
		September 30, 2013
		One-to				One-to				Home			Mobile			Secured			Construction
		Four-Family				Four-Family				Equity			Home			by			and Land
		Owner				Non-Owner										Other			Development
		Occupied				Occupied										Properties
	Grade:
	Pass	$	25,536,497			$	15,291,094			$	2,243,716		$	1,655,013		$	2,570,695		$	3,540,745
	Special Mention		—				—				—			—			—			—
	Substandard		827,455				1,845,206				—			130,841			213,099			370,411
	Doubtful		—				344,653				—			—			—			—
		$	26,363,952			$	17,480,953			$	2,243,716		$	1,785,854		$	2,783,794		$	3,911,156
		Secured				Savings				Totals
		Commercial
	Grade:
	Pass	$	1,603,318			$	9,159			$	52,450,238
	Special Mention		—				—				—
	Substandard		—				—				3,387,011
	Doubtful		—				—				344,653
		$	1,603,318			$	9,159			$	56,181,902
		September 30, 2012
		One-to				One-to				Home			Mobile			Secured			Construction
		Four-Family				Four-Family				Equity			Home			by			and Land
		Owner				Non-Owner										Other			Development
		Occupied				Occupied										Properties
	Grade:
	Pass	$	25,261,976			$	15,904,215			$	2,172,247		$	1,814,197		$	2,397,025		$	2,820,472
	Special Mention		—				—				—			74,743			—			—
	Substandard		835,822				1,951,089				—			179,732			—			441,980
	Doubtful		—				—				—			—			216,000			—
		$	26,097,798			$	17,855,304			$	2,172,247		$	2,068,672		$	2,613,025		$	3,262,452
		Secured				Savings				Totals
		Commercial
	Grade:
	Pass	$	1,212,534			$	10,290			$	51,592,956
	Special Mention		—				—				74,743
	Substandard		—				—				3,408,623
	Doubtful		—				—				216,000
		$	1,212,534			$	10,290			$	55,292,322
Loan Portfolio Delinquencies by Loan Class	'
	The following tables set forth certain information with respect to our loan portfolio delinquencies by loan class and amount as of September 30, 2013, and September 30, 2012:
		September 30, 2013
		30-59				60-89				Greater			Total Past			Current			Total			Recorded
		Days Past				Days Past				Than 90			Due						Financing			Investment >
		Due				Due				Days									Receivables			90 Days and
																						Accruing
	Real estate loans:
	One-to four-family owner occupied	$	—			$	—			$	690,975		$	690,975		$	25,672,977		$	26,363,952		$	—
	One-to four-family non-owner occupied		—				—				1,635,383			1,635,383			15,845,570			17,480,953			—
	Home equity		—				—				—			—			2,243,716			2,243,716			—
	Mobile home		73,774				—				—			73,774			1,712,080			1,785,854			—
	Secured by other properties		—				—				—			—			2,783,794			2,783,794			—
	Construction and land development		—				—				—			—			3,911,156			3,911,156			—
	Total real estate loans		73,774				—				2,326,358			2,400,132			52,169,293			54,569,425			—
	Other loans:
	Secured commercial		—				—				—			—			1,603,318			1,603,318			—
	Savings accounts		—				—				—			—			9,159			9,159			—
	Total other loans		—				—				—			—			1,612,477			1,612,477			—
	Total loans	$	73,774			$	—			$	2,326,358		$	2,400,132		$	53,781,770		$	56,181,902		$	—
		September 30, 2012
		30-59				60-89				Greater			Total Past			Current			Total			Recorded
		Days Past				Days Past				Than 90			Due						Financing			Investment >
		Due				Due				Days									Receivables			90 Days and
																						Accruing
	Real estate loans:
	One-to four-family owner occupied	$	—			$	—			$	835,822		$	835,822		$	25,261,976		$	26,097,798		$	—
	One-to four-family non-owner occupied		228,229				—				721,392			949,621			16,905,683			17,855,304			—
	Home equity		—				—				—			—			2,172,247			2,172,247			—
	Mobile home		46,927				—				103,541			150,468			1,918,204			2,068,672			—
	Secured by other properties		—				—				216,000			216,000			2,397,025			2,613,025			—
	Construction and land development		—				—				—			—			3,262,452			3,262,452			—
	Total real estate loans		275,156				—				1,876,755			2,151,911			51,917,587			54,069,498			—
	Other loans:
	Secured commercial		—				—				—			—			1,212,534			1,212,534			—
	Savings accounts		—				—				—			—			10,290			10,290			—
	Total other loans		—				—				—			—			1,222,824			1,222,824			—
	Total loans	$	275,156			$	—			$	1,876,755		$	2,151,911		$	53,140,411		$	55,292,322		$	—
Summary of Non-Accrual Loans	'
	The following table is a summary of the non-accrual loans by loan class as of:
		September 30,				September 30,
		2013				2012
	Real estate loans:
	One-to four-family owner occupied	$	690,975			$	835,822
	One-to four-family non-owner occupied		1,635,383				721,392
	Home equity		—				—
	Mobile home		59,554				103,541
	Secured by other properties		—				216,000
	Construction and land development		—				—
	Total real estate loans		2,385,912				1,876,755
	Other loans:
	Secured commercial		—				—
	Savings accounts		—				—
	Total other loans		—				—
	Total loans	$	2,385,912			$	1,876,755
Summary of Impaired Loans by Class of Loans	'
	The following tables are a summary of impaired loans by class as of September 30, 2013 and September 30, 2012:
		September 30, 2013
		Recorded				Unpaid				Related			Average			Interest
		Investment				Principal				Allowance			Recorded			Income
						Balance							Investment			Recognized
	With no related allowance recorded:
	One-to four-family owner occupied	$	904,113			$	827,455			$	—		$	904,113		$	31,184
	One-to four-family non-owner occupied		609,362				507,227				—			609,362			13,288
	Secured by other properties		226,434				213,099				—			226,434			684
	Construction and land development		370,411				370,411				—			370,411			20,043
	Mobile homes		59,627				59,554				—			59,627			4,078
	With an allowance recorded:
	One-to four-family non-owner occupied	$	1,217,512			$	1,128,156			$	201,267		$	1,217,512		$	21,255
	Mobile home		46,508				46,386				488			46,508			3,097
	Total
	One-to four-family owner occupied	$	904,113			$	827,455			$	—		$	904,113		$	31,184
	One-to four-family non-owner occupied		1,867,709				1,635,383				201,267			1,867,709			34,543
	Secured by other properties		226,434				213,099				—			226,434			684
	Construction and land development		370,411				370,411				—			370,411			20,043
	Mobile home		106,135				105,940				488			106,135			7,175
		September 30, 2012
		Recorded				Unpaid				Related			Average			Interest
		Investment				Principal				Allowance			Recorded			Income
						Balance							Investment			Recognized
	With no related allowance recorded:
	One-to four-family owner occupied	$	877,758			$	835,822			$	—		$	877,758		$	25,376
	One-to four-family non-owner occupied		896,218				721,392				—			896,218			15,792
	Secured by other properties		227,819				216,000				—			225,834			—
	With an allowance recorded:
	One-to four-family non-owner occupied	$	856,752			$	855,879			$	30,901		$	856,752		$	47,446
	Mobile home		165,267				152,256				36,517			165,267			9,561
	Total
	One-to four-family owner occupied	$	877,758			$	835,822			$	—		$	877,758		$	25,376
	One-to four-family non-owner occupied		1,752,970				1,577,271				30,901			1,752,970			63,238
	Secured by other properties		227,819				216,000				—			227,819			—
	Mobile home		165,267				152,256				36,517			165,267			9,561
Summary of Impaired Loans That Were Modified Due to Troubled Debt Restructuring by Class	'
	The following table is a summary of impaired loans that were modified due to a troubled debt restructuring by class as of September 30, 2013 and September 30, 2012:
		Modifications for the year ended September 30, 2013
		Number of		Pre-Modification				Post-Modification
		contracts		Outstanding Recorded				Outstanding Recorded
				Investments				Investments
	Troubled Debt Restructuring
	Construction and land development	1		$	370,411			$	370,411
	Mobile home	1			59,627				59,627
				Recorded Investment
	Troubled Debt Restructuring that subsequently defaulted
	One-to four-family owner occupied				1			$	67,000
		Modifications for the year ended September 30, 2012
		Number of		Pre-Modification				Post-Modification
		contracts		Outstanding Recorded				Outstanding Recorded
				Investments				Investments
	Troubled Debt Restructuring
	One-to four-family owner occupied	1		$	151,932			$	151,932
	One-to four-family non-owner occupied	5			856,752				825,851
	Secured by other properties	1			227,819				227,819
	Mobile home	1			48,715				46,198
				Recorded Investment
	Troubled Debt Restructuring that subsequently defaulted
	One-to four-family owner occupied	1		$	151,932

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Sep. 30, 2013
Premises and Equipment	'
	Premises and equipment at September 30, 2013 and 2012, were as follows:
		2013			2012			Depreciable
								Lives
	Cost
	Land	$	1,142,089		$	1,142,089			-
	Buildings and land improvements		2,031,589			2,031,589			10-50 yrs
	Furniture, fixtures, and equipment		518,026			467,949			3-7 yrs
	Total		3,691,704			3,641,627
	Less: accumulated depreciation		(536,642	)		(404,632	)
		$	3,155,062		$	3,236,995

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Sep. 30, 2013
Advances Outstanding from Federal Home Loan Bank ("FHLB")	'
	The Company has advances outstanding from the Federal Home Loan Bank (“FHLB”). A schedule of the borrowings is as follows:
	Advance				Rate			Maturity		September 30,		September 30,
	Amount							Date		2013		2012
	$	1,000,000				4.235	%		7/31/17	$	1,000,000	$	1,000,000
		1,000,000				4.01	%		8/21/17		1,000,000		1,000,000
		1,500,000				3.227	%		11/24/17		1,500,000		1,500,000
		1,500,000				3.4	%		11/27/17		1,500,000		1,500,000
		1,000,000				2.599	%		10/2/18		1,000,000		1,000,000
		1,000,000				2.6	%		7/2/18		1,000,000		1,000,000
		1,000,000				3.05	%		7/3/18		1,000,000		1,000,000
										$	8,000,000	$	8,000,000
Scheduled Maturities of FHLB Advances	'
	At September 30, 2013, the scheduled maturities of the FHLB advances are as follows:
	2014		$	—
	2015			—
	2016			—
	2017			2,000,000
	2018			5,000,000
	Thereafter			1,000,000
			$	8,000,000

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2013
Income Tax Provision Reflected in Statements of Income	'
	The income tax provision reflected in the statements of income consisted of the following components for the years ended September 30, 2013 and 2012:
		2013			2012
	Income tax expense
	Current tax expense
	Federal	$	139,077		$	166,554
	State		34,118			53,381
	Total current		173,195			219,935
	Deferred tax expense (benefit)
	Federal		8,834			(105,141	)
	State		(1,302	)		(367	)
	Total deferred		7,532			(105,508	)
	Total income tax expense	$	180,727		$	114,427
Reconciliation of Tax Computed at Federal Statutory Tax Rate	'
	A reconciliation of tax computed at the Federal statutory tax rate of 34% to the actual tax expense for the years ended September 30, 2013 and 2012, is as follows:
		2013			2012
	Tax at Federal statutory rate	$	149,987		$	498,725
	Tax effect of:
	Nontaxable gain on business combination		—			(347,505	)
	Tax exempt income		(3,712	)		(16,605	)
	Graduated rates		13,546			(55,181	)
	State income taxes, net of federal benefit		20,906			34,993
	Income tax expense	$	180,727		$	114,427
Components of Net Deferred Tax Asset (Liability)	'
	The components of the net deferred tax asset (liability) at September 30, 2013 and 2012 were as follows:
		2013			2012
	Deferred income tax assets:
	Nonaccrual interest	$	99,334		$	63,315
	Loans yield adjustment		11,291			17,827
	Certificate of deposit yield adjustment		—			8,750
	Core deposit intangible		4,494			—
	ESOP Plan funding		—			7,053
	Stock Option Plan		14,866			—
	Deferred compensation		—			3,223
	Allowance for loan losses		289,346			243,593
	Foreclosed real estate provision		—			87,579
			419,331			431,340
	Deferred income tax liabilities:
	Net unrealized gain on securities		50,639			134,819
	Core deposit intangible		—			2,667
	Certificate of deposit yield adjustment		6,668			—
	Accumulated depreciation		74,278			82,755
			131,585			220,241
	Net deferred income tax asset (liability)	$	287,746		$	211,099

Employee_Stock_Ownership_Plan_

Employee Stock Ownership Plan (Tables)	12 Months Ended
	Sep. 30, 2013
Summary of Employee Stock Ownership Plan Shares	'
	A summary of ESOP shares is as follows:
		September 30,		September 30,
		2013		2012
	Shares committed for release		20,527		16,525
	Unearned shares		19,498		23,500
	Total ESOP shares		40,025		40,025
	Fair value of unearned shares	$	389,960	$	399,500

Stock_Option_Plan_Tables

Stock Option Plan (Tables)	12 Months Ended
	Sep. 30, 2013
Summary of Stock Option Plan	'
	A summary of the Stock Option Plan year ended September 30, 2013:
		Number of		Weighted Average
		Shares		Exercise
				Price
	Outstanding at September 30, 2012		37,760	$	14.1
	Granted		37,760	$	14.1
	Outstanding at September 30, 2013		37,760	$	14.1
	Options Exercisable at September 30, 2013		7,552	$	14.1

Stock_Repurchases_Tables

Stock Repurchases (Tables)	12 Months Ended
	Sep. 30, 2013
Information in Connection with Repurchases of Shares of Common Stock	'
	The following table sets forth information in connection with repurchases of the Company’s shares of common stock during the period listed.
	Period	Total		Average		Total Number of		Maximum
		Number of		Price		Shares		Number of
		Shares		Paid per		Purchased as		Shares That May
		Purchased		Share		Part of Publicly		Yet Be Purchased
						Announced Plans		Under the Plan
						or Programs
	September 1-30, 2012		22,800	$	17.07		22,800		17,200
	October 1-31, 2012		6,000		17.05		28,800		11,200
	November 1-30, 2012		1,800		17.1		30,600		9,400
	December 1-31, 2012		—		—		30,600		9,400
	January 1-31, 2013		—		—		30,600		9,400
	February 1-28, 2013		—		—		30,600		9,400

Regulatory_Capital_Requirement1

Regulatory Capital Requirements (Tables)	12 Months Ended
	Sep. 30, 2013
Actual and Required Capital Amounts and Ratios of Company and Bank	'
	The actual and required capital amounts and ratios of the Company and the Bank as of September 30, 2013 and 2012, were as follows (dollars in thousands):
		Actual						For Capital					To Be Well
								Adequacy Purposes					Capitalized under
													the Prompt
													Corrective Action
													Provisions
		Amount			Ratio			Amount		Ratio			Amount		Ratio
	As of September 30, 2013:
	Fairmount Bancorp, Inc.
	Total Risk-based Capital (to risk-weighted assets)		13,420			31.99	%		3,373		³8.0	%		N/A		N/A
	Tier 1 Capital (to risk-weighted assets)		12,893			30.73	%		1,686		³4.0	%		N/A		N/A
	Tier 1 Capital (to adjusted total assets)		12,893			16.75	%		3,080		³4.0	%		N/A		N/A
	Tangible Capital (to tangible assets)		12,893			16.75	%		1,155		³1.5	%		N/A		N/A
	Fairmount Bank
	Total Risk-based Capital (to risk-weighted assets)		11,824			28.24	%		3,366		³8.0	%		4,169		³10.0	%
	Tier 1 Capital (to risk-weighted assets)		11,298			26.98	%		1,683		³4.0	%		2,501		³6.0	%
	Tier 1 Capital (to adjusted total assets)		11,298			14.7	%		3,074		³4.0	%		3,943		³5.0	%
	Tangible Capital (to tangible assets)		11,298			14.7	%		1,153		³1.5	%		N/A		N/A
	As of September 30, 2012:
	Fairmount Bancorp, Inc.
	Total Risk-based Capital (to risk-weighted assets)		13,171			31.53	%		3,342		³8.0	%		N/A		N/A
	Tier 1 Capital (to risk-weighted assets)		12,648			30.27	%		1,671		³4.0	%		N/A		N/A
	Tier 1 Capital (to adjusted total assets)		12,648			16.01	%		3,160		³4.0	%		N/A		N/A
	Tangible Capital (to tangible assets)		12,648			16.01	%		1,185		³1.5	%		N/A		N/A
	Fairmount Bank
	Total Risk-based Capital (to risk-weighted assets)		11,353			27.23	%		3,335		³8.0	%		4,169		³10.0	%
	Tier 1 Capital (to risk-weighted assets)		10,831			25.98	%		1,668		³4.0	%		2,501		³6.0	%
	Tier 1 Capital (to adjusted total assets)		10,831			13.73	%		3,154		³4.0	%		3,943		³5.0	%
	Tangible Capital (to tangible assets)		10,831			13.73	%		1,183		³1.5	%		N/A		N/A
Presentation of reconciliation of Company's consolidated equity	'
	The following table presents a reconciliation of the Company’s consolidated equity as determined using U.S. GAAP and the Bank’s regulatory capital amounts:
		September 30,
		2013			2012
	Consolidated equity GAAP equity	$	13,003		$	12,855
	Consolidated equity in excess of Bank equity		(1,594	)		(1776	)
	Bank GAAP equity		11,409			11,079
	Core deposit intangible		(33	)		(41	)
	Accumulated other comprehensive (income) loss, net of tax		(78	)		(207	)
	Total tangible, leverage and core (tier 1) capital		11,298			10,831
	Qualifying allowance for loan losses		526			522
	Total risk-based capital	$	11,824		$	11,353

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2013
Summary of Financial Assets and Liabilities Measured at Fair Value	'
	The following table presents a summary of financial assets and liabilities measured at fair value at September 30, 2013 and September 30, 2012:
		Level 1			Level 2			Level 3		Total		Total
												Losses
	September 30, 2013
	Securities available for sale:
	Mortgage-backed securities invested in Government Agencies	$	—		$	4,021,365		$	—	$	4,021,365	$	—
	Collateralized mortgage obligations invested in Government Agencies					529,739					529,739		—
	State and Municipal Securities					1,240,621					1,240,621
	Impaired loans		—			—			972,787		972,787		—
	Foreclosed assets								20,000		20,000	$	16,781
	September 30, 2012
	Securities available for sale:
	Mortgage-backed securities invested in Government Agencies	$	—		$	5,979,683		$	—	$	5,979,633	$	—
	Collaterialized mortgage obligations invested in Government Agencies		—			1,823,892			—		1,823,892		—
	Impaired loans		—			—			940,717		940,717		—
	Foreclosed assets		—						295,750		295,750		—
Fair Value Measurements for Certain Financial Assets Measured at Fair Value on Non-recurring Basis	'
	The following table presents quantitative information about Level 3 Fair Value Measurements for certain financial assets measured at fair value on a non-recurring basis for September 30, 2013 and September 30, 2012:
		Quantitative Information about Level 3 Fair Value Measurements for
		September 30, 2013 and September 30, 2012
		Valuation Techniques		Unobservable Input	Range
	Assets:
	Impaired loans	Discounted appraised value		Selling costs	6-12%
	Foreclosed assets	Discounted appraised value		Selling costs	6-12%
Reconciliation of Beginning and Ending Balances for Level 3 Assets	'
	The following table presents a reconciliation of the beginning and ending balances for Level 3 assets;
		Impaired Loans			Foreclosed Assets
	Balance, September 30, 2011		717,648			884,000
	Purchases, settlements and charge-offs		(230,000	)		(588,250	)
	Transfers in and/or out of Level 3		453,069			—
	Balance, September 30, 2012		940,717			295,750
	Purchases, settlements and charge-offs		(294,140	)		(295,750	)
	Transfers in and/or out of Level 3		326,210			20,000
	Balance, September 30, 2013	$	972,787		$	295,750
Estimated Fair Values of Financial Instruments	'
	The estimated fair values of the Company’s financial instruments were as follows:
					Fair Value Measurements at September 30, 2013 Using
		Carrying			Quoted			Significant		Significant		Fair
		Value			Prices in			Other		Unobservable		Value
					Active			Observable		Inputs
					Market for			Inputs		(Level 3)
					Identical			(Level 2)
					Assets
					(Level 1)
		(in thousands)
	Financial assets:
	Cash and cash equivalents	$	3,851		$	3,851		$	—	$	—	$	3,851
	Certificates of deposit		3,784			3,784			—		—		3,784
	Securities available for sale		5,792			—			5,792		—		5,792
	Securities held to maturity		3,756			—			3,603		—		3,603
	Federal Home Loan Bank stock		454			—			454		—		454
	Loans receivable, net		55,375			—			55,058		973		56,031
	Foreclosed real estate		20			—			—		20		20
	Accrued interest receivable		233			—			233		—		233
	Financial liabilities:
	Deposits		55,930			—			56,178		—		56,178
	Federal Home Loan Bank advances		8,000			—			8,698		—		8,698
	Accrued interest payable		43			—			43		—		43
	Off-Balance sheet financial instruments		—			—					—		—
					Fair Value Measurements at September 30, 2012 Using
		Carrying			Quoted			Significant		Significant		Fair
		Value			Prices in			Other		Unobservable		Value
					Active			Observable		Inputs
					Market for			Inputs		(Level 3)
					Identical			(Level 2)
					Assets
					(Level 1)
		(in thousands)
	Financial assets:
	Cash and cash equivalents	$	4,363		$	4,363		$	—	$	—	$	4,363
	Securities available for sale		3,532			3,532			—		—		3,532
	Securities held to maturity		7,804			—			7,804		—		7,804
	Federal Home Loan Bank stock		3,637			—			3,804		—		3,804
	Loans receivable, net		480			—			480		—		480
	Foreclosed real estate		54,650			—			54,580		941		55,521
	Accrued interest receivable		296			—			—		296		296
	Financial liabilities:		290			—			290		—		290
	Deposits		58,026			—			58,064		—		58,064
	Federal Home Loan Bank advances		8,000			—			8,987		—		8,987
	Accrued interest payable		43			—			43		—		43
	Off-Balance sheet financial instruments		—			—			—		—		—
Loans Payable	'
Estimated Fair Values of Financial Instruments	'
	Loan commitments representing off-balance sheet risk at September 30, 2013 and 2012 were as follows:
		Contract or Notional Amount
		2013			2012
	Mortgage loan commitments-fixed rate (3.00% - 7.75%)	$	—		$	850,500
	Unused lines of credit		3,686,945			1,725,628
	Available home equity lines of credit		1,845,383			2,187,617
	Standby letters of credit		121,466			216,997
		$	5,653,794		$	4,980,742

Earnings_per_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Sep. 30, 2013
Computation of Basic and Dilutive Earnings per Share	'
	Basic earnings per share excludes dilution and is computed by dividing net income by the basic weighted average number of common shares outstanding during the period. Dilutive earnings per share reflects the potential dilution that could occur if stock options were exercised and is computed by dividing net income by the dilutive weighted average number of common shares outstanding during the period.
		September 30,		September 30,
		2013		2012
	Income before extraordinary item	$	257,470	$	326,292
	Extraordinary item, gain on business combination		—		1,022,074
	Net income	$	257,470	$	1,348,366
	Weighted average number of shares used in:
	Basic earnings per share		445,643		472,278
	Dilutive common stock equivalents:
	Stock options		11,139		6,441
	Dilutive earnings per share		456,782		478,719
	Basic and dilutive earnings per common share:
	Income before extraordinary item, basic	$	0.58	$	0.69
	Extraordinary item, gain on business combination, basic		—		2.17
	Net income, basic	$	0.58	$	2.86
	Income before extraordinary item, dilutive	$	0.56	$	0.68
	Extraordinary item, gain on business combination, dilutive		—		2.14
	Net income, dilutive	$	0.56	$	2.82

Parent_Company_Only_Financial_1

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Sep. 30, 2013
Summary of Condensed Balance Sheet	'
	CONDENSED BALANCE SHEET
		September 30,			September 30,
		2013			2012
	Assets:
	Cash and due from bank	$	221,881		$	378,404
	Certificates of deposit		1,030,436			1,025,167
	Investment in bank subsidiary		11,408,505			11,079,179
	Loans receivable		324,704			368,549
	Other assets		26,953			28,740
	Total assets	$	13,012,479		$	12,880,039
	Liabilities and Stockholders’ Equity
	Liabilities:
	Accounts payable		9,250			24,849
	Total liabilities		9,250			24,849
	Stockholders’ Equity
	Preferred stock, $0.01 par value; authorized 1,000,000; none issue		—			—
	Common stock, $0.01 par value; authorized 4,000,000; 500,314 issued; 477,514 and 477,514 shares outstanding at September 30, 2013 and 2012, respectively		5,003			5,003
	Additional paid in capital		4,040,748			3,854,869
	Unearned common stock held by:
	Employee Stock Ownership Plan		(209,736	)		(251,607	)
	Recognition and Retention Plan		(245,145	)		(162,271	)
	Retained earnings		9,334,634			9,077,164
	Accumulated other comprehensive income		77,725			206,929
	Total stockholders’ equity		13,003,229			12,855,190
	Total liabilities and stockholders’ equity	$	13,012,479		$	12,880,039
Summary of Operations	'
	CONDENSED STATEMENT OF OPERATIONS
		Year Ended			Year Ended
		September 30,			September 30,
		2013			2012
	Interest income on loans	$	16,873		$	18,910
	Interest and dividends on investments		5,722			10,273
	Total income		22,595			29,183
	Operating expenses		97,036			111,563
	Loss before equity in net income of bank subsidiary		(74,441	)		(82,380	)
	Income tax benefits		25,310			28,009
	Net loss before equity in net income of bank subsidiary		(49,131	)		(54,371	)
	Equity in net income of bank subsidiary		306,601			1,402,737
	Net income	$	257,470		$	1,348,366
Summary Cash Flows	'
	CONDENSED STATEMENT OF CASH FLOWS
		Year Ended			Year Ended
		September 30,			September 30,
		2013			2012
	Cash flows from operating activities:
	Net loss	$	(49,131	)	$	(54,371	)
	Adjustments to reconcile net loss to net cash provided (used) by operating activities:
	Equity in net income of subsidiary		306,601			1,402,737
	Compensation cost on allocated ESOP shares		71,676			59,750
	Compensation cost on allocated RRP shares and stock options		81,177			—
	(Increase) decrease in other assets		1,787			9,602
	Increase (decrease) in other liabilities		(15,599	)		17,349
	Net cash provided (used) by operating activities		396,511			1,435,067
	Cash flow from investing activities:
	(Increase) decrease in loans		43,845			49,510
	Investment in bank subsidiary		(458,530	)		(1,382,009	)
	Net cash provided (used) by investing activities		(414,685	)		(1,332,499	)
	Cash flows from financing activities:
	Proceeds from issuance of common stock, net of costs		—			351,573
	Net increase in interest-bearing deposits		(5,269	)		(8,051	)
	Repurchase of common stock		(133,080	)		(389,240	)
	Net cash provided (used) by financing activities		(138,349	)		(45,718	)
	Net increase (decrease) in cash and cash equivalents		(156,523	)		56,850
	Cash and cash equivalents, beginning balance		378,404			321,554
	Cash and cash equivalents, ending balance	$	221,881		$	378,404

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended			12 Months Ended		1 Months Ended
	Oct. 31, 2011	Jun. 30, 2010	Jun. 02, 2010	Sep. 30, 2013	Sep. 30, 2012	Oct. 12, 2011
						Fullerton
Significant Accounting Policies [Line Items]	'	'	'	'	'	'
Shares of common stock converted through sale and issuance	'	'	444,038	'	'	'
Conversion price per share	'	$10	$10	'	'	$14.10
Proceeds from sale of common stock	'	'	$3,742,000	'	'	$452,000
Net of offering expenses	'	'	699,000	'	'	341,000
Percentage of net proceeds of offering	'	'	50.00%	'	'	'
Amount of net proceeds of offering	'	'	1,900,000	'	'	'
Percentage of issued and outstanding shares of common stock of the Bank	'	'	100.00%	'	'	'
Percentage of shares subscribed	8.00%	8.00%	8.00%	'	'	'
Shares of common stock sold in offering	4,502	35,523	35,523	'	'	'
Common stock issued and sold	'	'	'	'	'	56,276
Federal Home Loan Bank stock, at cost	'	'	'	453,700	479,700	'
Number of days to send borrower a late notice	'	'	'	'15 days	'	'
Number of days to send borrower a letter reminding	'	'	'	'30 days	'	'
Advertising costs	'	'	'	1,746	13,687	'
Deposits in other financial institutions	'	'	'	2,750,000	3,512,000	'
Insured amount by securities investor protection corporation	'	'	'	'	500,000	'
Minimum balance in deposit account required	'	'	'	$100,000	$100,000	'

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	1 Months Ended		1 Months Ended	9 Months Ended
	Jun. 02, 2010	Jun. 30, 2010	Oct. 12, 2011	Sep. 30, 2013
			Fullerton	Fullerton
Business Acquisition [Line Items]	'	'	'	'
Common stock issued and sold	'	'	$56,276	'
Selling price of common shares	$10	$10	$14.10	'
Proceeds from sale of common stock	3,742,000	'	452,000	'
Net proceeds of offering expense	699,000	'	341,000	'
Increase (decrease) in goodwill from acquisition	'	'	'	($1,022,074)

Carrying_Value_of_Fullertons_A

Carrying Value of Fullerton's Assets and Liabilities Adjusted to Reflect Fair Value (Detail) (Fullerton, USD $)	Oct. 12, 2011
Fullerton	'
Assets	'
Cash and cash equivalents	$4,224,279
Securities available for sale	827,139
Loans receivable	2,414,712
Federal Home Loan Bank stock, at cost	15,300
Premises and equipment	887,503
Other assets	174,579
Total assets acquired	8,543,512
Liabilities	'
Deposits	7,333,130
Other liabilities	77,427
Total liabilities assumed	$7,410,557

Amortized_Cost_and_Estimated_M

Amortized Cost and Estimated Market Value of Securities Classified as Available for Sale and Held to Maturity (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Marketable Securities [Line Items]	'	'
Securities Available for sale, Amortized Cost	$5,663,360	$7,461,826
Securities Available for Sale, Gross Unrealized Gains	166,298	350,447
Securities Available for Sale, Gross Unrealized Losses	37,933	8,698
Securities Available for sale, Fair Value	5,791,725	7,803,575
Securities Held to Maturity, Amortized Cost	3,756,238	3,636,972
Securities Held to Maturity, Gross Unrealized Gains	'	166,926
Securities Held to Maturity, Gross Unrealized Losses	158,526	'
Securities Held to Maturity, Fair Value	3,602,703	3,803,898
U.S. Government and Federal Agency Obligations	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Securities Held to Maturity, Amortized Cost	3,756,238	1,999,145
Securities Held to Maturity, Gross Unrealized Gains	4,991	11,784
Securities Held to Maturity, Gross Unrealized Losses	158,526	'
Securities Held to Maturity, Fair Value	3,602,703	2,010,929
State and Municipal Securities	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Securities Available for sale, Amortized Cost	1,273,145	'
Securities Available for Sale, Gross Unrealized Losses	32,524	'
Securities Available for sale, Fair Value	1,240,621	'
Securities Held to Maturity, Amortized Cost	'	1,637,827
Securities Held to Maturity, Gross Unrealized Gains	'	155,142
Securities Held to Maturity, Fair Value	'	1,792,969
Residential Mortgage-Backed Securities	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Securities Available for sale, Amortized Cost	3,855,067	5,629,774
Securities Available for Sale, Gross Unrealized Gains	166,298	349,909
Securities Available for sale, Fair Value	4,021,365	5,979,683
Collateralized Mortgage Obligations	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Securities Available for sale, Amortized Cost	535,148	1,832,052
Securities Available for Sale, Gross Unrealized Gains	'	538
Securities Available for Sale, Gross Unrealized Losses	5,409	8,698
Securities Available for sale, Fair Value	$529,739	$1,823,892

Amortized_Cost_and_Estimated_M1

Amortized Cost and Estimated Market Value of Securities, by Contractual Maturity (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available for sale, Due in one year or less, Amortized Cost	'	'
Securities Available for sale, Due after one year through five years, Amortized Cost	550,169	'
Securities Available for sale, Due five years to ten years, Amortized Cost	490,391	'
Securities Available for sale, Due after ten years, Amortized Cost	4,622,800	'
Securities Available for sale, Amortized Cost	5,663,360	'
Securities Available for sale, Due in one year or less, Fair Value	'	'
Securities Available for sale, Due after one year through five years, Fair Value	549,536	'
Securities Available for sale, Due five years to ten years, Fair Value	475,290	'
Securities Available for sale, Due after ten years, Fair Value	4,766,899	'
Securities Available for sale, Fair Value	5,791,725	'
Securities Held to Maturity, Due in one year or less, Amortized Cost	'	'
Securities Held to Maturity, Due after one year through five years, Amortized Cost	1,740,850	'
Securities Held to Maturity, Due five years to ten years, Amortized Cost	2,015,388	'
Securities Held to Maturity, Due after ten years, Amortized Cost	'	'
Securities Held to Maturity, Amortized Cost	3,756,238	3,636,972
Securities Held to Maturity, Due in one year or less, Fair Value	'	'
Securities Held to Maturity, Due after one year through five years, Fair Value	1,724,203	'
Securities Held to Maturity, Due five years to ten years, Fair Value	1,878,500	'
Securities Held to Maturity, Due after ten years, Fair Value	'	'
Securities Held to Maturity, Fair Value	$3,602,703	$3,803,898

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
	Investment	Investment
Proceeds from sale of available for sale securities	$1,753,845	$189,692
Realized gross gain on sale	116,480	896
Number of securities with gross unrealized losses investments	8	2
Total gross unrealized losses	$196,459	$8,698

Securities_with_Gross_Unrealiz

Securities with Gross Unrealized Losses Aggregated by Investment Category and Length of Time That Individual Securities Have Been in Continuous Loss Position (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Fair Value	$1,240,621	$1,435,900
Months Gross Unrealized Losses	32,524	8,698
Securities Available-for-Sale, Fair Value, 12 Months or Greater	529,739	'
, 2012 Greater Gross Unrealized Losses	5,409	'
Securities Available-for-Sale, Fair Value, Total	1,770,360	1,435,900
Gross Unrealized Losses	37,933	8,698
Securities Held-to-Maturity, Fair Value, Less than 12 Months	2,849,720	'
Securities Held-to-Maturity, Gross Unrealized Loss, Less than 12 Months	158,526	'
Securities Held-to-Maturity, Fair Value, 12 Months or Greater	'	'
Securities Held-to-Maturity, Gross Unrealized Loss, 12 Months or Greater	'	'
Securities Held-to-Maturity, Fair Value, Total	2,849,720	'
Securities Held-to-Maturity, Total Gross Unrealized Loss, Total	158,526	'
U.S. Government and Federal Agency Obligations	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Held-to-Maturity, Fair Value, Less than 12 Months	2,849,720	'
Securities Held-to-Maturity, Gross Unrealized Loss, Less than 12 Months	158,526	'
Securities Held-to-Maturity, Fair Value, 12 Months or Greater	'	'
Securities Held-to-Maturity, Gross Unrealized Loss, 12 Months or Greater	'	'
Securities Held-to-Maturity, Fair Value, Total	2,849,720	'
Securities Held-to-Maturity, Total Gross Unrealized Loss, Total	158,526	'
State and Municipal Securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Fair Value	1,240,621	'
Months Gross Unrealized Losses	32,524	'
Securities Available-for-Sale, Fair Value, Total	1,240,621	'
Gross Unrealized Losses	32,524	'
Securities Held-to-Maturity, Fair Value, 12 Months or Greater	'	'
Securities Held-to-Maturity, Gross Unrealized Loss, 12 Months or Greater	'	'
Collateralized Mortgage Obligations	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Less than 12 Fair Value	'	1,435,900
Months Gross Unrealized Losses	'	8,698
Securities Available-for-Sale, Fair Value, 12 Months or Greater	529,739	'
, 2012 Greater Gross Unrealized Losses	5,409	'
Securities Available-for-Sale, Fair Value, Total	529,739	1,435,900
Gross Unrealized Losses	$5,409	$8,698

Principal_Categories_of_Loan_P

Principal Categories of Loan Portfolio (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$56,181,902	$55,292,322
Unamortized premiums and loan fees	250,880	319,713
Unearned income on loans	-323,966	-344,450
Allowance for loan and lease losses	-733,451	-617,474
Total loans, net	55,375,365	54,650,111
Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	54,569,425	54,069,498
Other Loans Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,612,477	1,222,824
One To Four Family Owner Occupied	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	26,363,952	26,097,798
One To Four Family Owner Occupied | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	26,363,952	26,097,798
One To Four Family Non Owner Occupied	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	17,480,953	17,855,304
One To Four Family Non Owner Occupied | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	17,480,953	17,855,304
Home Equity	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	2,243,716	2,172,247
Home Equity | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	2,243,716	2,172,247
Mobile Home	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,785,854	2,068,672
Mobile Home | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,785,854	2,068,672
Secured By Other Properties	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	2,783,794	2,613,025
Secured By Other Properties | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	2,783,794	2,613,025
Construction and Land Development	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	3,911,156	3,262,452
Construction and Land Development | Real Estate	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	3,911,156	3,262,452
Secured Commercial	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,603,318	1,212,534
Secured Commercial | Other Loans Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	1,603,318	1,212,534
Savings	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	9,159	10,290
Savings | Other Loans Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Total loans	$9,159	$10,290

Loans_and_Allowance_for_Loan_a2

Loans and Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $)	1 Months Ended
	31-May-09	Oct. 31, 2004	Sep. 30, 2013	Sep. 30, 2012
Loans And Leases [Line Items]	'	'	'	'
Total loans	'	'	$56,181,902	$55,292,322
Unamortized loan premiums	'	'	10,721	13,187
Amount paid to purchase mortgage loans	1,109,768	2,126,620	'	'
Carrying amounts of purchased mortgage loans	'	'	556,213	657,951
Average yield of mortgage loans receivable	6.08%	6.00%	'	'
Mobile Home Loan	'	'	'	'
Loans And Leases [Line Items]	'	'	'	'
Total loans	'	'	1,785,854	2,068,672
Unamortized loan premiums	'	'	0	42,762
Prepaid loan origination fees	'	'	$211,177	$261,337

Loans_and_Remaining_Contractua

Loans and Remaining Contractual Maturities (Detail) (USD $)	Sep. 30, 2013
Loans And Leases [Line Items]	'
One year or less	$3,095,533
After one year to five years	7,595,647
After five years to ten years	17,055,071
After ten years to fifteen years	7,862,923
After fifteen years	20,572,728
Contractual maturities, Total	$56,181,902

Loans_to_Officers_Directors_an

Loans to Officers, Directors and Related Affiliates (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Loans And Leases [Line Items]	'	'
Balance, beginning of year	$485,531	$513,789
Additions	214,902	'
Repayments	-27,113	-28,258
Balance, end of year	$673,320	$485,531

Balance_of_Allowance_for_Loan_

Balance of Allowance for Loan Losses (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	$617,474	'
Charge-offs	-16,781	0
Ending Balance	733,451	617,474
Ending balance: individually evaluated for impairment	2,761,150	2,383,399
Ending balance: collectively evaluated for impairment	53,029,614	52,510,973
Ending balance: loans acquired with deteriorated credit quality	391,138	397,950
Financing receivables: Ending balance	56,181,902	55,292,322
Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	617,474	665,289
Charge-offs	-387,763	-247,815
Recoveries	3,740	'
Provision	500,000	200,000
Ending Balance	733,451	617,474
Ending balance: individually evaluated for impairment	201,755	67,418
Ending balance: collectively evaluated for impairment	531,696	550,056
Financing receivables: Ending balance	56,181,902	55,292,322
One To Four Family Owner Occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: individually evaluated for impairment	436,317	437,872
Ending balance: collectively evaluated for impairment	27,780,213	27,434,223
Ending balance: loans acquired with deteriorated credit quality	391,138	397,950
Financing receivables: Ending balance	26,363,952	26,097,798
One To Four Family Owner Occupied | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	85,217	64,547
Charge-offs	'	-72,815
Provision	-4,654	93,485
Ending Balance	80,563	85,217
Ending balance: collectively evaluated for impairment	80,563	85,217
Financing receivables: Ending balance	28,607,668	28,270,045
One To Four Family Non Owner Occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: individually evaluated for impairment	1,635,383	1,577,271
Ending balance: collectively evaluated for impairment	15,845,570	16,278,033
Financing receivables: Ending balance	17,480,953	17,855,304
One To Four Family Non Owner Occupied | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	273,683	382,023
Charge-offs	-363,842	-175,000
Recoveries	3,740	'
Provision	562,003	66,660
Ending Balance	475,584	273,683
Ending balance: individually evaluated for impairment	201,267	30,901
Ending balance: collectively evaluated for impairment	274,317	242,782
Financing receivables: Ending balance	17,480,953	17,855,304
Mobile Home	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: individually evaluated for impairment	105,940	152,256
Ending balance: collectively evaluated for impairment	1,679,914	1,916,416
Financing receivables: Ending balance	1,785,854	2,068,672
Mobile Home | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	95,613	52,719
Charge-offs	-23,921	'
Provision	9,251	42,894
Ending Balance	80,943	95,613
Ending balance: individually evaluated for impairment	488	36,517
Ending balance: collectively evaluated for impairment	80,455	59,096
Financing receivables: Ending balance	1,785,854	2,068,672
Secured By Other Properties	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: individually evaluated for impairment	213,099	216,000
Ending balance: collectively evaluated for impairment	2,570,695	2,397,025
Financing receivables: Ending balance	2,783,794	2,613,025
Secured By Other Properties | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	30,442	25,702
Provision	-8,077	4,740
Ending Balance	22,365	30,442
Ending balance: collectively evaluated for impairment	22,365	30,442
Financing receivables: Ending balance	2,783,794	2,613,025
Construction and Land Development	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: individually evaluated for impairment	370,411	'
Ending balance: collectively evaluated for impairment	3,540,745	3,262,452
Financing receivables: Ending balance	3,911,156	3,262,452
Construction and Land Development | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	80,327	91,135
Provision	-49,522	-10,808
Ending Balance	30,805	80,327
Ending balance: collectively evaluated for impairment	30,805	80,327
Financing receivables: Ending balance	3,911,156	3,262,452
Other Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Ending balance: collectively evaluated for impairment	1,612,477	1,222,824
Financing receivables: Ending balance	1,612,477	1,222,824
Other Loans Receivable | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	3,057	3,907
Provision	974	-850
Ending Balance	4,031	3,057
Ending balance: collectively evaluated for impairment	4,031	3,057
Financing receivables: Ending balance	1,612,477	1,222,824
Unallocated | Loans Receivable	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Beginning Balance	49,135	45,256
Provision	-9,975	3,879
Ending Balance	39,160	49,135
Ending balance: collectively evaluated for impairment	$39,160	$49,135

Summary_of_Loan_Portfolio_Qual

Summary of Loan Portfolio Quality Indicators by Loan Class Recorded Investment (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	$56,181,902	$55,292,322
Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	52,450,238	51,592,956
Special Mention	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	'	74,743
Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	3,387,011	3,408,623
Doubtful	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	344,653	216,000
One To Four Family Owner Occupied	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	26,363,952	26,097,798
One To Four Family Owner Occupied | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	25,536,497	25,261,976
One To Four Family Owner Occupied | Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	827,455	835,822
One To Four Family Non Owner Occupied	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	17,480,953	17,855,304
One To Four Family Non Owner Occupied | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	15,291,094	15,904,215
One To Four Family Non Owner Occupied | Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	1,845,206	1,951,089
One To Four Family Non Owner Occupied | Doubtful	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	344,653	'
Home Equity	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	2,243,716	2,172,247
Home Equity | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	2,243,716	2,172,247
Mobile Home	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	1,785,854	2,068,672
Mobile Home | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	1,655,013	1,814,197
Mobile Home | Special Mention	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	'	74,743
Mobile Home | Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	130,841	179,732
Secured By Other Properties	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	2,783,794	2,613,025
Secured By Other Properties | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	2,570,695	2,397,025
Secured By Other Properties | Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	213,099	'
Secured By Other Properties | Doubtful	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	'	216,000
Construction and Land Development	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	3,911,156	3,262,452
Construction and Land Development | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	3,540,745	2,820,472
Construction and Land Development | Substandard	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	370,411	441,980
Secured Commercial	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	1,603,318	1,212,534
Secured Commercial | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	1,603,318	1,212,534
Savings	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	9,159	10,290
Savings | Pass	'	'
Summary of Allowances for Credit Loss and Related Financing Receivables [Line Items]	'	'
Total loans	$9,159	$10,290

Credit_Quality_of_Financing_Re2

Credit Quality of Financing Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
	Loan	Loan
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Notice for late payment of loan due after	'15 days	'
Letter reminding the borrower of the delinquency for Loan due after	'30 days	'
Final demand for payment of the delinquency	'90 days	'
Summary report of all loans due after	'30 days	'
Loans placed on non-accrual status delinquency due after	'90 days	'
Maximum duration for Loans returned to accrual status delinquent	'90 days	'
Amount of loans on non-accrual status	251,798	160,495
Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	10	8
Non-accrual Loans	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Number of loans on non-accrual status	29	23
One To Four Family Owner Occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	'	1
One To Four Family Owner Occupied | Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Recorded Investment	136,481	138,035
One To Four Family Non Owner Occupied	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	'	5
One To Four Family Non Owner Occupied | Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	5	5
Financing Receivable, Modifications, Recorded Investment	783,503	855,879
Secured By Other Properties	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	'	1
Secured By Other Properties | Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Recorded Investment	213,099	216,000
Construction and Land Development	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1	'
Construction and Land Development | Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1	'
Financing Receivable, Modifications, Recorded Investment	370,411	'
Mobile Home	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	1	1
Mobile Home | Troubled Debt Restructuring	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'
Financing Receivable, Modifications, Number of Contracts	2	1
Financing Receivable, Modifications, Recorded Investment	105,940	51,313

Loan_Portfolio_Delinquencies_b

Loan Portfolio Delinquencies by Loan Class (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable, Recorded Investment [Line Items]	'	'
30-59 Days Past Due	$73,774	$275,156
60-89 Days Past Due	'	'
Greater Than 90 Days	2,326,358	1,876,755
Total Past Due	2,400,132	2,151,911
Current	53,781,770	53,140,411
Total Financing Receivables	56,181,902	55,292,322
Recorded Investment > 90 Days and Accruing	'	'
One To Four Family Owner Occupied	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	26,363,952	26,097,798
One To Four Family Non Owner Occupied	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	17,480,953	17,855,304
Home Equity	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	2,243,716	2,172,247
Mobile Home	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	1,785,854	2,068,672
Secured By Other Properties	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	2,783,794	2,613,025
Construction and Land Development	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total Financing Receivables	3,911,156	3,262,452
Secured Commercial	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Current	1,603,318	1,212,534
Total Financing Receivables	1,603,318	1,212,534
Recorded Investment > 90 Days and Accruing	'	'
Savings	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Current	9,159	10,290
Total Financing Receivables	9,159	10,290
Recorded Investment > 90 Days and Accruing	'	'
Other Loans Receivable	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Current	1,612,477	1,222,824
Total Financing Receivables	1,612,477	1,222,824
Recorded Investment > 90 Days and Accruing	'	'
Real Estate	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
30-59 Days Past Due	73,774	275,156
60-89 Days Past Due	'	'
Greater Than 90 Days	2,326,358	1,876,755
Total Past Due	2,400,132	2,151,911
Current	52,169,293	51,917,587
Total Financing Receivables	54,569,425	54,069,498
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | One To Four Family Owner Occupied	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Greater Than 90 Days	690,975	835,822
Total Past Due	690,975	835,822
Current	25,672,977	25,261,976
Total Financing Receivables	26,363,952	26,097,798
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | One To Four Family Non Owner Occupied	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
30-59 Days Past Due	'	228,229
60-89 Days Past Due	'	'
Greater Than 90 Days	1,635,383	721,392
Total Past Due	1,635,383	949,621
Current	15,845,570	16,905,683
Total Financing Receivables	17,480,953	17,855,304
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | Home Equity	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Current	2,243,716	2,172,247
Total Financing Receivables	2,243,716	2,172,247
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | Mobile Home	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
30-59 Days Past Due	73,774	46,927
60-89 Days Past Due	'	'
Greater Than 90 Days	'	103,541
Total Past Due	73,774	150,468
Current	1,712,080	1,918,204
Total Financing Receivables	1,785,854	2,068,672
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | Secured By Other Properties	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Greater Than 90 Days	'	216,000
Total Past Due	'	216,000
Current	2,783,794	2,397,025
Total Financing Receivables	2,783,794	2,613,025
Recorded Investment > 90 Days and Accruing	'	'
Real Estate | Construction and Land Development	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
60-89 Days Past Due	'	'
Current	3,911,156	3,262,452
Total Financing Receivables	3,911,156	3,262,452
Recorded Investment > 90 Days and Accruing	'	'

Recorded_Investment_in_Nonaccr

Recorded Investment in Non-accrual Loans (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	$2,385,912	$1,876,755
Real Estate	'	'
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	2,385,912	1,876,755
Real Estate | One To Four Family Owner Occupied	'	'
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	690,975	835,822
Real Estate | One To Four Family Non Owner Occupied	'	'
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	1,635,383	721,392
Real Estate | Mobile Home	'	'
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	59,554	103,541
Real Estate | Secured By Other Properties	'	'
Financing Receivable Recorded Investment Nonaccrual Status [Line Items]	'	'
Recorded investment in non-accrual loans	'	$216,000

Summary_of_Impaired_Loans_by_C

Summary of Impaired Loans by Class of Loans (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
One To Four Family Owner Occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment, with no related allowance recorded	$904,113	$877,758
Unpaid Principal Balance, with no related allowance recorded	827,455	835,822
Related allowance, with no related allowance	'	'
Average recorded investment, with no related allowance recorded	904,113	877,758
Interest Income Recognized, with no related allowance recorded	31,184	25,376
Recorded Investment, total	904,113	877,758
Unpaid Principal Balance, total	827,455	835,822
Average Recorded Investment, total	904,113	877,758
Interest Income Recognized, total	31,184	25,376
One To Four Family Non Owner Occupied	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment, with no related allowance recorded	609,362	896,218
Unpaid Principal Balance, with no related allowance recorded	507,227	721,392
Related allowance, with no related allowance	'	'
Average recorded investment, with no related allowance recorded	609,362	896,218
Interest Income Recognized, with no related allowance recorded	13,288	15,792
Recorded investment, with related allowance recorded	1,217,512	856,752
Unpaid Principal Balance, with related allowance recorded	1,128,156	855,879
Related Allowance, With Related Allowance	201,267	30,901
Average recorded investment, with related allowance recorded	1,217,512	856,752
Interest Income Recognized, with related allowance recorded	21,255	47,446
Recorded Investment, total	1,867,709	1,752,970
Unpaid Principal Balance, total	1,635,383	1,577,271
Related Allowance, total	201,267	30,901
Average Recorded Investment, total	1,867,709	1,752,970
Interest Income Recognized, total	34,543	63,238
Secured By Other Properties	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment, with no related allowance recorded	226,434	227,819
Unpaid Principal Balance, with no related allowance recorded	213,099	216,000
Related allowance, with no related allowance	'	'
Average recorded investment, with no related allowance recorded	226,434	225,834
Interest Income Recognized, with no related allowance recorded	684	'
Recorded Investment, total	226,434	227,819
Unpaid Principal Balance, total	213,099	216,000
Average Recorded Investment, total	226,434	227,819
Interest Income Recognized, total	684	'
Construction and Land Development	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment, with no related allowance recorded	370,411	'
Unpaid Principal Balance, with no related allowance recorded	370,411	'
Related allowance, with no related allowance	'	'
Average recorded investment, with no related allowance recorded	370,411	'
Interest Income Recognized, with no related allowance recorded	20,043	'
Recorded Investment, total	370,411	'
Unpaid Principal Balance, total	370,411	'
Average Recorded Investment, total	370,411	'
Interest Income Recognized, total	20,043	'
Mobile Home	'	'
Financing Receivable, Impaired [Line Items]	'	'
Recorded Investment, with no related allowance recorded	59,627	'
Unpaid Principal Balance, with no related allowance recorded	59,554	'
Related allowance, with no related allowance	'	'
Average recorded investment, with no related allowance recorded	59,627	'
Interest Income Recognized, with no related allowance recorded	4,078	'
Recorded investment, with related allowance recorded	46,508	165,267
Unpaid Principal Balance, with related allowance recorded	46,386	152,256
Related Allowance, With Related Allowance	488	36,517
Average recorded investment, with related allowance recorded	46,508	165,267
Interest Income Recognized, with related allowance recorded	3,097	9,561
Recorded Investment, total	106,135	165,267
Unpaid Principal Balance, total	105,940	152,256
Related Allowance, total	488	36,517
Average Recorded Investment, total	106,135	165,267
Interest Income Recognized, total	$7,175	$9,561

Summary_of_Impaired_Loans_That

Summary of Impaired Loans That Were Modified Due to Troubled Debt Restructuring by Class (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
	Contract	Contract
One To Four Family Owner Occupied	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of contracts	'	1
Pre-Modification Outstanding Recorded Investments	'	$151,932
Post-Modification Outstanding Recorded Investments	'	151,932
Number of contracts subsequently defaulted	1	1
Recorded Investment subsequently defaulted	67,000	151,932
One To Four Family Non Owner Occupied	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of contracts	'	5
Pre-Modification Outstanding Recorded Investments	'	856,752
Post-Modification Outstanding Recorded Investments	'	825,851
Mobile Home	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of contracts	1	1
Pre-Modification Outstanding Recorded Investments	59,627	48,715
Post-Modification Outstanding Recorded Investments	59,627	46,198
Secured By Other Properties	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of contracts	'	1
Pre-Modification Outstanding Recorded Investments	'	227,819
Post-Modification Outstanding Recorded Investments	'	227,819
Construction and Land Development	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of contracts	1	'
Pre-Modification Outstanding Recorded Investments	370,411	'
Post-Modification Outstanding Recorded Investments	$370,411	'

Premises_and_Equipment_Detail

Premises and Equipment (Detail) (USD $)

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Building and Building Improvements

Building and Building Improvements

Furniture Fixture And Equipment

Furniture Fixture And Equipment

Furniture Fixture And Equipment

Furniture Fixture And Equipment

Land

Land

Buildings And Land Improvements

Buildings And Land Improvements

Minimum

Maximum

Minimum

Maximum

Property, Plant and Equipment [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Property plant and equipment

$3,691,704

$3,641,627

'

'

$518,026

$467,949

'

'

$1,142,089

$1,142,089

$2,031,589

$2,031,589

Less: accumulated depreciation

-536,642

-404,632

'

'

'

'

'

'

'

'

'

'

Premises and equipment, net

$3,155,062

$3,236,995

'

'

'

'

'

'

'

'

'

'

Property plant and equipment use full life

'

'

'10 years

'50 years

'

'

'3 years

'7 years

'

'

'

'

Premises_and_Equipment_Additio

Premises and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Property, Plant, and Equipment Disclosure [Line Items]	'	'
Depreciation expense	$132,010	$123,727

Foreclosed_Real_Estate_Additio

Foreclosed Real Estate - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Real Estate [Line Items]	'	'
Foreclosed assets	$20,000	$295,750
Allowances for loan losses	733,451	617,474
Disposed of foreclosed assets	272,027	347,846
Gain (loss) on disposition of foreclosed assets	-23,723	3,842
Foreclosed Real Estate	'	'
Real Estate [Line Items]	'	'
Foreclosed assets	20,000	295,750
Allowances for loan losses	16,781	0
Disposed of foreclosed assets	295,750	347,846
Gain (loss) on disposition of foreclosed assets	($23,723)	($18,404)

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Deposit Liabilities And Borrowed Federal Funds [Line Items]	'	'
Aggregate amount of deposits with balances of $100,000 or more	$15,445,563	$18,608,689
Deposit balances of employees officers, directors and their affiliated interests	202,179	226,814
Brokered deposits	$0	$0

Certificates_of_Deposit_and_Re

Certificates of Deposit and Remaining Maturities (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Time Deposits [Line Items]	'	'
Total	$34,442,370	$37,427,659
Certificates of Deposit	'	'
Time Deposits [Line Items]	'	'
2014	17,425,755	'
2015	8,782,333	'
2016	2,751,064	'
2017	2,176,707	'
2018	3,306,510	'
Total	$34,442,369	'

Advances_Outstanding_from_Fede

Advances Outstanding from Federal Home Loan Bank ("FHLB") (Detail) (USD $)

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

7/31/17

7/31/17

8/21/17

8/21/17

11/24/17

11/24/17

11/27/17

11/27/17

10/2/18

10/2/18

7/2/18

7/2/18

7/3/18

7/3/18

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances

7/31/17

8/21/17

11/24/17

11/27/17

10/2/18

7/2/18

7/3/18

Schedule of Federal Home Loan Bank Advances and Other Borrowings [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Advance Amount

'

'

$1,000,000

'

$1,000,000

'

$1,500,000

'

$1,500,000

'

$1,000,000

'

$1,000,000

'

$1,000,000

'

'

'

'

'

'

'

'

Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.24%

4.01%

3.23%

3.40%

2.60%

2.60%

3.05%

Maturity Date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Jul-17

21-Aug-17

24-Nov-17

27-Nov-17

2-Oct-18

2-Jul-18

3-Jul-18

Federal Home Loan Bank advances

$8,000,000

$8,000,000

$1,000,000

$1,000,000

$1,000,000

$1,000,000

$1,500,000

$1,500,000

$1,500,000

$1,500,000

$1,000,000

$1,000,000

$1,000,000

$1,000,000

$1,000,000

$1,000,000

'

'

'

'

'

'

'

Borrowings_Additional_Informat

Borrowings - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Borrowings [Line Items]	'	'
Percentage of credit availability of assets	30.00%	'
Collateral amount	$36,900,000	'
Credit availability with a correspondent bank for short term liquidity	1,500,000	'
Borrowings outstanding	$0	$0

Scheduled_Maturities_of_FHLB_A

Scheduled Maturities of FHLB Advances (Detail) (USD $)	Sep. 30, 2013
Debt And Commitments Maturities [Line Items]	'
2014	'
2015	'
2016	'
2017	2,000,000
2018	5,000,000
Thereafter	1,000,000
FHLB maturities advances, total	$8,000,000

Income_Tax_Provision_Reflected

Income Tax Provision Reflected in Statements of Income (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Current tax expense	'	'
Federal	$139,077	$166,554
State	34,118	53,381
Total current	173,195	219,935
Deferred tax expense (benefit)	'	'
Federal	8,834	-105,141
State	-1,302	-367
Total deferred	7,533	-105,508
Income tax expense	$180,727	$114,427

Reconciliation_of_Tax_Computed

Reconciliation of Tax Computed at Federal Statutory Tax Rate (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of Statutory Federal Tax Rate [Line Items]	'	'
Tax at Federal statutory rate	$149,987	$498,725
Tax effect of:	'	'
Nontaxable gain on business combination	'	-347,505
Tax exempt income	-3,712	-16,605
Graduated rates	13,546	-55,181
State income taxes, net of federal benefit	20,906	34,993
Income tax expense	$180,727	$114,427

Components_of_Net_Deferred_Tax

Components of Net Deferred Tax Asset (Liability) (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Deferred income tax assets:	'	'
Nonaccrual interest	$99,334	$63,315
Loans yield adjustment	11,291	17,827
Certificate of deposit yield adjustment	'	8,750
Core deposit intangible	4,494	'
ESOP Plan funding	'	7,053
Stock Option Plan	14,866	'
Deferred compensation	'	3,223
Allowance for loan losses	289,346	243,593
Foreclosed real estate provision	'	87,579
Deferred Tax Assets, Deferred Income	419,331	431,340
Deferred income tax liabilities:	'	'
Net unrealized gain on securities	50,639	134,819
Core deposit intangible	'	2,667
Certificate of deposit yield adjustment	6,668	'
Accumulated depreciation	74,278	82,755
Total Deferred Tax Liabilities	131,585	220,241
Net deferred income tax asset (liability)	$287,746	$211,099

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013
Income Taxes [Line Items]	'
Retained earnings reserve for loan losses for tax purposes	$731,536
Liability for uncertain tax positions	0
Interest and penalties on unrecognized tax benefits	0
Fullerton	'
Income Taxes [Line Items]	'
Remaining net operating loss carryforwards	$335,000
Operating loss carryforwards expiration year	'2031

Defined_Contribution_Benefit_P1

Defined Contribution Benefit Plan - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jul. 31, 2009	Sep. 30, 2013	Sep. 30, 2012
	Age
Defined Contribution Plan [Line Items]	'	'	'
Minimum age of emplyees to avail Benefit under defined Contribution Benefit Plan	21	'	'
Minimum service provide of employees to avail benefit under Defined Contribution Benefit Plan	'12 months	'	'
Defined Benefit Plan maximum percentage of contribution by company	4.00%	'	'
Percentage of vesting rights by Participants in deferrals and employer matching contributions	100.00%	'	'
Additional contribution	'	$25,510	$25,481

Employee_Stock_Ownership_Plan_1

Employee Stock Ownership Plan - Additional Information (Detail) (USD $)	1 Months Ended			12 Months Ended
	Oct. 31, 2011	Jun. 30, 2010	Jun. 02, 2010	Sep. 30, 2013	Sep. 30, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]	'	'	'	'	'
Borrowed funds under ESOP	$63,478	$355,230	'	'	'
Shares of common stock sold in offering	4,502	35,523	35,523	'	'
Percentage of shares subscribed	8.00%	8.00%	8.00%	'	'
Conversion price per share	'	$10	$10	'	'
Stock issued during period shares with conversion merger	$14.10	'	'	'	'
Term of loan repaid by ESOP	'	'	'	'10 years	'
Interest rate on ESOP loan	'	'	'	3.25%	'
Rate of accrued benefits under ESOP	'	'	'	20.00%	'
Compensation expense under ESOP	'	'	'	$71,676	$59,750

Summary_of_Employee_Stock_Owne

Summary of Employee Stock Ownership Plan Shares (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]	'	'
Shares committed for release	20,527	16,525
Unearned shares	19,498	23,500
Total ESOP shares	40,025	40,025
Fair value of unearned shares	$389,960	$399,500

Recognition_and_Retention_Plan1

Recognition and Retention Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Reinsurance Retention Policy [Line Items]	'	'
Maximum rate at which RRP participants will vest in their share awards	20.00%	'
Term period of RRP participants vest in share awards	'5 years	'
Compensation expense	$42,568	$0
RRP	'	'
Reinsurance Retention Policy [Line Items]	'	'
Maximum rate at which RRP participants will vest in their share awards	20.00%	'
Shares awarded under the RRP	15,104	'
Maximum number of shares acquired in Initial Public Offering	17,761	'
RRP maximum grant percentage, employee director	25.00%	'
RRP maximum grant percentage, non-employee director	5.00%	'
Maximum percentage of shares awarded to non-employee director in aggregate	30.00%	'

Stock_Option_Plan_Additional_I

Stock Option Plan - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Stock Options [Line Items]	'	'
Maximum rate for plan participants to exercise the options	20.00%	'
Vested period of options	'5 years	'
Exercise period of options	'10 years	'
Number of Grants made	37,760	'
Compensation expense	$42,568	$0
Employees And Non Employee Directors	'	'
Schedule Of Stock Options [Line Items]	'	'
Number of Grants made	37,760	'
Stock Option Plans	'	'
Schedule Of Stock Options [Line Items]	'	'
Compensation expense	$37,684	$0

Summary_of_Stock_Option_Plan_D

Summary of Stock Option Plan (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013
Schedule Of Stock Options [Line Items]	'
Outstanding at September 30, 2012	37,760
Granted	37,760
Outstanding at September 30, 2013	37,760
Options Exercisable at September 30, 2013	7,552
Weighted Average Exercise Price at September 30, 2012	$14.10
Weighted Average Exercise Price, Granted	$14.10
Weighted Average Exercise Price at September 30, 2013	$14.10
Weighted Average Exercise Price, Options Exercisable at September 30, 2013	$14.10

Stock_Repurchases_Additional_I

Stock Repurchases - Additional Information (Detail)	Oct. 04, 2012	Sep. 07, 2012
Share Repurchases [Line Items]	'	'
Initial number of outstanding common stock Board of Directors authorized to repurchase	40,000	25,000
Initial percentage of shares outstanding equal to shares authorized to repurchase	'	5.00%
Percentage of shares outstanding equal to shares authorized to repurchase	8.00%	'

Information_in_Connection_with

Information in Connection with Repurchases of Shares of Common Stock (Detail) (USD $)	1 Months Ended
	Sep. 30, 2013
September 1 - 30, 2012	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased	22,800
Average Price Paid per Share	$17.07
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	22,800
Maximum Number of Shares That May Yet Be Purchased Under the Plan	17,200
October 1 - 31, 2012	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased	6,000
Average Price Paid per Share	$17.05
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	28,800
Maximum Number of Shares That May Yet Be Purchased Under the Plan	11,200
November 1 - 30, 2012	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased	1,800
Average Price Paid per Share	$17.10
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	30,600
Maximum Number of Shares That May Yet Be Purchased Under the Plan	9,400
December 1 - 31, 2012	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	30,600
Maximum Number of Shares That May Yet Be Purchased Under the Plan	9,400
January 1-31 , 2013	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	30,600
Maximum Number of Shares That May Yet Be Purchased Under the Plan	9,400
February 1-28 , 2013	'
Share Repurchases [Line Items]	'
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	30,600
Maximum Number of Shares That May Yet Be Purchased Under the Plan	9,400

Deferred_Compensation_Obligati1

Deferred Compensation Obligation - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Jun. 30, 2004
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]	'	'
Minimum Period of service to be attained by president under deferred compensation arrangement	'10 years	'
Deferred compensation obligation, amount accrued	'	$66,237
Percentage of interest factor utilized for present value calculations	'	5.00%
Life insurance policy under Deferred Compensation Obligation	'	$100,000
Period for payment of deferred compensation obligation	'2012-07	'

Actual_and_Required_Capital_Am

Actual and Required Capital Amounts and Ratios of Company and Bank (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Risk-based Capital (to risk-weighted assets), Actual Amount	$11,824	$11,353
Fairmount Bancorp, Inc.	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Risk-based Capital (to risk-weighted assets), Actual Amount	13,420,000	13,171,000
Tier 1 Capital (to risk-weighted assets), Actual Amount	12,893,000	12,648,000
Tier 1 Capital (to adjusted total assets), Actual Amount	12,893,000	12,648,000
Tangible Capital (to tangible assets), Actual Amount	12,893,000	12,648,000
Total Risk-based Capital (to risk-weighted assets), Actual Ratio	31.99%	31.53%
Tier 1 Capital (to risk-weighted assets), Actual Ratio	30.73%	30.27%
Tier 1 Capital (to adjusted total assets), Actual Ratio	16.75%	16.01%
Tangible Capital (to tangible assets), Actual Ratio	16.75%	16.01%
Total Risk-based Capital (to risk-weighted assets), Amount For Capital Adequacy Purposes	3,373	3,342
Tier 1 Capital (to risk-weighted assets), Amount For Capital Adequacy Purposes	1,686	1,671
Tier 1 Capital (to adjusted total assets), Amount For Capital Adequacy Purposes	3,080	3,160
Tangible Capital (to tangible assets), Amount For Capital Adequacy Purposes	1,155	1,185
Fairmount Bancorp, Inc. | Minimum	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Risk-based Capital (to risk-weighted assets), Ratio For Capital Adequacy Purposes	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Ratio For Capital Adequacy Purposes	4.00%	4.00%
Tier 1 Capital (to adjusted total assets), Ratio For Capital Adequacy Purposes	4.00%	4.00%
Tangible Capital (to tangible assets), Ratio For Capital Adequacy Purposes	1.50%	1.50%
Tangible Capital (to tangible assets), Ratio Required to be Well Capitalized under the Prompt Corrective Action Provisions	1.50%	1.50%
Fairmount Bank	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Risk-based Capital (to risk-weighted assets), Actual Amount	11,824,000	11,353,000
Tier 1 Capital (to risk-weighted assets), Actual Amount	11,298,000	10,831,000
Tier 1 Capital (to adjusted total assets), Actual Amount	11,298,000	10,831,000
Tangible Capital (to tangible assets), Actual Amount	11,298,000	10,831,000
Total Risk-based Capital (to risk-weighted assets), Actual Ratio	28.24%	27.23%
Tier 1 Capital (to risk-weighted assets), Actual Ratio	26.98%	25.98%
Tier 1 Capital (to adjusted total assets), Actual Ratio	14.70%	13.73%
Tangible Capital (to tangible assets), Actual Ratio	14.70%	13.73%
Total Risk-based Capital (to risk-weighted assets), Amount For Capital Adequacy Purposes	3,366	3,335
Tier 1 Capital (to risk-weighted assets), Amount For Capital Adequacy Purposes	1,683	1,668
Tier 1 Capital (to adjusted total assets), Amount For Capital Adequacy Purposes	3,074	3,154
Tangible Capital (to tangible assets), Amount For Capital Adequacy Purposes	1,153	1,183
Fairmount Bank | Minimum	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Risk-based Capital (to risk-weighted assets), Amount Required to be Well Capitalized under the Prompt Corrective Action Provisions	4,169	4,169
Tier 1 Capital (to risk-weighted assets), Amount Required to be Well Capitalized under the Prompt Corrective Action Provisions	2,501	2,501
Tier 1 Capital (to adjusted total assets), Amount Required to be Well Capitalized under the Prompt Corrective Action Provisions	$3,943	$3,943
Total Risk-based Capital (to risk-weighted assets), Ratio For Capital Adequacy Purposes	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Ratio For Capital Adequacy Purposes	4.00%	4.00%
Tier 1 Capital (to adjusted total assets), Ratio For Capital Adequacy Purposes	4.00%	4.00%
Tangible Capital (to tangible assets), Ratio For Capital Adequacy Purposes	1.50%	1.50%
Total Risk-based Capital (to risk-weighted assets), Ratio Required to be Well Capitalized under the Prompt Corrective Action Provisions	10.00%	10.00%
Tier 1 Capital (to risk-weighted assets), Ratio Required to be Well Capitalized under the Prompt Corrective Action Provisions	6.00%	6.00%
Tier 1 Capital (to adjusted total assets), Ratio Required to be Well Capitalized under the Prompt Corrective Action Provisions	5.00%	5.00%
Tangible Capital (to tangible assets), Ratio Required to be Well Capitalized under the Prompt Corrective Action Provisions	1.50%	1.50%

Presentation_of_Reconciliation

Presentation of Reconciliation of Company's Consolidated Equity (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'	'
Consolidated equity GAAP equity	$13,003,229	$12,855,190	$11,477,337
Consolidated equity in excess of Bank equity	-1,594	-1,776	'
Bank GAAP equity	11,409	11,079	'
Core deposit intangible	-33	-41	'
Accumulated other comprehensive (income) loss, net of tax	77,725	206,929	'
Total tangible, leverage and core (tier 1) capital	11,298	10,831	'
Qualifying allowance for loan losses	526	522	'
Total risk-based capital	$11,824	$11,353	'

Summary_of_Financial_Assets_an

Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Foreclosed assets	$16,781	'
Level 2 | Mortgage-backed securities invested in Government Agencies	'	'
Securities available for sale	4,021,365	5,979,683
Level 2 | Collateralized mortgage obligations invested in Government Agencies	'	'
Securities available for sale	529,739	1,823,892
Level 2 | State and Municipal Securities	'	'
Securities available for sale	1,240,621	'
Level 3	'	'
Impaired loans	972,787	940,717
Foreclosed assets	20,000	295,750
Total	'	'
Impaired loans	972,787	940,717
Foreclosed assets	20,000	295,750
Total | Mortgage-backed securities invested in Government Agencies	'	'
Securities available for sale	4,021,365	5,979,633
Total | Collateralized mortgage obligations invested in Government Agencies	'	'
Securities available for sale	529,739	1,823,892
Total | State and Municipal Securities	'	'
Securities available for sale	$1,240,621	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Fair Value Measurements Disclosure [Line Items]	'	'
Financing receivable allowance for credit losses write offs	$16,781	$0

Fair_Value_Measurements_for_Ce

Fair Value Measurements for Certain Financial Assets Measured at Fair Value on Non-recurring Basis (Detail)	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Measurement Inputs, Disclosure [Line Items]	'	'
Impaired loans valuation techniques	'Discounted appraised value	'Discounted appraised value
Foreclosed assets valuation techniques	'Discounted appraised value	'Discounted appraised value
Impaired loans unobservable input	'Selling costs	'Selling costs
Foreclosed assets unobservable input	'Selling costs	'Selling costs
Minimum	'	'
Fair Value, Measurement Inputs, Disclosure [Line Items]	'	'
Range of impaired Loans	6.00%	6.00%
Range of foreclosed assets	6.00%	6.00%
Maximum	'	'
Fair Value, Measurement Inputs, Disclosure [Line Items]	'	'
Range of impaired Loans	12.00%	12.00%
Range of foreclosed assets	12.00%	12.00%

Reconciliation_of_Beginning_an

Reconciliation of Beginning and Ending Balances for Level 3 Assets (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Impaired Loans	'	'
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]	'	'
Beginning Balance	$940,717	$717,648
Purchases, settlements and charge-offs	-294,140	-230,000
Transfers in and/or out of Level 3	326,210	453,069
Ending Balance	972,787	940,717
Foreclosed Assets	'	'
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]	'	'
Beginning Balance	295,750	884,000
Purchases, settlements and charge-offs	-295,750	-588,250
Transfers in and/or out of Level 3	20,000	'
Ending Balance	$295,750	$295,750

Estimated_Fair_Values_of_Finan

Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Financial assets:	'	'
Securities held to maturity	$3,602,703	$3,803,898
Carrying Value	'	'
Financial assets:	'	'
Cash and cash equivalents	3,851,000	4,363,000
Certificates of deposit	3,784,000	'
Securities available for sale	5,792,000	3,532,000
Securities held to maturity	3,756,000	7,804,000
Federal Home Loan Bank stock	454,000	3,637,000
Loans receivable, net	55,375,000	480,000
Foreclosed assets	20,000	54,650,000
Accrued interest receivable	233,000	296,000
Financial liabilities:	'	'
Deposits	55,930,000	58,026,000
Federal Home Loan Bank advances	8,000,000	8,000,000
Accrued interest payable	43,000	43,000
Off-Balance sheet financial instruments	'	'
Level 1	'	'
Financial assets:	'	'
Cash and cash equivalents	3,851,000	4,363,000
Certificates of deposit	3,784,000	'
Securities available for sale	'	3,532,000
Financial liabilities:	'	'
Off-Balance sheet financial instruments	'	'
Level 2	'	'
Financial assets:	'	'
Securities available for sale	5,792,000	'
Securities held to maturity	3,603,000	7,804,000
Federal Home Loan Bank stock	454,000	3,804,000
Loans receivable, net	55,058,000	480,000
Foreclosed assets	'	54,580,000
Accrued interest receivable	233,000	'
Financial liabilities:	'	'
Deposits	56,178,000	58,064,000
Federal Home Loan Bank advances	8,698,000	8,987,000
Accrued interest payable	43,000	43,000
Off-Balance sheet financial instruments	'	'
Level 3	'	'
Financial assets:	'	'
Loans receivable, net	973,000	'
Foreclosed assets	20,000	941,000
Accrued interest receivable	'	296,000
Financial liabilities:	'	'
Off-Balance sheet financial instruments	'	'
Fair Value	'	'
Financial assets:	'	'
Cash and cash equivalents	3,851,000	4,363,000
Certificates of deposit	3,784,000	'
Securities available for sale	5,792,000	3,532,000
Securities held to maturity	3,603,000	7,804,000
Federal Home Loan Bank stock	454,000	3,804,000
Loans receivable, net	56,031,000	480,000
Foreclosed assets	20,000	55,521,000
Accrued interest receivable	233,000	296,000
Financial liabilities:	'	'
Deposits	56,178,000	58,064,000
Federal Home Loan Bank advances	8,698,000	8,987,000
Accrued interest payable	43,000	43,000
Off-Balance sheet financial instruments	'	'

Loan_Commitments_Representing_

Loan Commitments Representing Off-Balance Sheet Risk (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Contract or Notional Amount	$5,653,794	$4,980,742
Mortgage loan commitments-fixed rate (3.00% - 7.75%)	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Contract or Notional Amount	'	850,500
Unused lines of credit	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Contract or Notional Amount	3,686,945	1,725,628
Home Equity	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Contract or Notional Amount	1,845,383	2,187,617
Standby Letters of Credit	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Contract or Notional Amount	$121,466	$216,997

Computation_of_Basic_and_Dilut

Computation of Basic and Dilutive Earnings per Share (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Line Items]	'	'
Income before extraordinary item	$257,470	$326,292
Extraordinary item, gain on business combination	'	1,022,074
Net income	$257,470	$1,348,366
Weighted average number of shares used in:	'	'
Basic earnings per share	445,643	472,278
Dilutive common stock equivalents:	'	'
Stock options	11,139	6,441
Dilutive earnings per share	456,782	478,719
Basic and dilutive earnings per common share:	'	'
Income before extraordinary item, basic	$0.58	$0.69
Extraordinary item, gain on business combination, basic	'	$2.17
Net income, basic	$0.58	$2.86
Income before extraordinary item, dilutive	$0.56	$0.68
Extraordinary item, gain on business combination, dilutive	'	$2.14
Net income, dilutive	$0.56	$2.82

Summary_of_Condensed_Balance_S

Summary of Condensed Balance Sheet (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Assets:	'	'	'
Cash and due from bank	$850,941	$513,787	'
Certificates of deposit	3,783,568	3,531,991	'
Total assets	77,028,149	79,043,753	'
Liabilities:	'	'	'
Total liabilities	64,024,920	66,188,563	'
Stockholders' Equity	'	'	'
Preferred stock, $0.01 par value; authorized 1,000,000; none issue	'	'	'
Common stock, $0.01 par value; authorized 4,000,000; 500,314 issued; 477,514 and 477,514 shares outstanding at September 30, 2013 and 2012, respectively	5,003	5,003	'
Additional paid in capital	4,040,748	3,979,972	'
Unearned common stock held by:	'	'	'
Employee Stock Ownership Plan	-209,736	-251,607	'
Recognition and Retention Plan	-245,145	-162,271	'
Retained earnings	9,334,634	9,077,164	'
Accumulated other comprehensive income	77,725	206,929	'
Total stockholders' equity	13,003,229	12,855,190	11,477,337
Total liabilities and stockholders' equity	77,028,149	79,043,753	'
Fairmount Bancorp, Inc.	'	'	'
Assets:	'	'	'
Cash and due from bank	221,881	378,404	'
Certificates of deposit	1,030,436	1,025,167	'
Investment in bank subsidiary	11,408,505	11,079,179	'
Loans receivable	324,704	368,549	'
Other assets	26,953	28,740	'
Total assets	13,012,479	12,880,039	'
Liabilities:	'	'	'
Accounts payable	9,250	24,849	'
Total liabilities	9,250	24,849	'
Stockholders' Equity	'	'	'
Preferred stock, $0.01 par value; authorized 1,000,000; none issue	'	'	'
Common stock, $0.01 par value; authorized 4,000,000; 500,314 issued; 477,514 and 477,514 shares outstanding at September 30, 2013 and 2012, respectively	5,003	5,003	'
Additional paid in capital	4,040,748	3,854,869	'
Unearned common stock held by:	'	'	'
Employee Stock Ownership Plan	-209,736	-251,607	'
Recognition and Retention Plan	-245,145	-162,271	'
Retained earnings	9,334,634	9,077,164	'
Accumulated other comprehensive income	77,725	206,929	'
Total stockholders' equity	13,003,229	12,855,190	'
Total liabilities and stockholders' equity	$13,012,479	$12,880,039	'

Summary_of_Condensed_Balance_S1

Summary of Condensed Balance Sheet (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Condensed Balance Sheet Statements, Captions [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	500,314	500,314
Common stock, shares outstanding	484,839	484,839
Fairmount Bancorp, Inc.	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	500,314	500,314
Common stock, shares outstanding	477,514	477,514

Summary_of_Operations_Detail

Summary of Operations (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Income Statements, Captions [Line Items]	'	'
Interest income on loans	$3,147,659	$3,319,533
Interest and dividends on investments	270,823	394,831
Total income	3,418,482	3,714,364
Income before income taxes	438,197	440,719
Income tax benefits	-180,727	-114,427
Fairmount Bancorp, Inc.	'	'
Condensed Income Statements, Captions [Line Items]	'	'
Interest income on loans	16,873	18,910
Interest and dividends on investments	5,722	10,273
Total income	22,595	29,183
Operating expenses	97,036	111,563
Income before income taxes	-74,441	-82,380
Income tax benefits	25,310	28,009
Net loss before equity in net income of bank subsidiary	-49,131	-54,371
Equity in net income of bank subsidiary	306,601	1,402,737
Net income	$257,470	$1,348,366

Summary_Cash_Flows_Detail

Summary Cash Flows (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 02, 2010	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'	'
Net loss	'	$257,470	$1,348,366
Adjustments to reconcile net loss to net cash provided (used) by operating activities:	'	'	'
Compensation cost on allocated RRP shares and stock options	'	42,568	0
Net cash provided (used) by operating activities	'	1,267,674	625,846
Cash flow from investing activities:	'	'	'
(Increase) decrease in loans	'	-1,225,254	1,322,887
Net cash provided (used) by investing activities	'	457,806	-151,433
Cash flows from financing activities:	'	'	'
Proceeds from issuance of common stock, net of costs	3,742,000	'	'
Net increase in interest-bearing deposits	'	-2,095,955	-254,806
Repurchase of common stock	'	-133,080	-389,240
Net cash provided (used) by financing activities	'	-2,237,205	-2,300,253
Net increase (decrease) in cash and cash equivalents	'	-511,725	-1,825,840
Cash and cash equivalents, beginning balance	'	4,363,186	6,189,026
Cash and cash equivalents, ending balance	'	3,851,461	4,363,186
Fairmount Bancorp, Inc.	'	'	'
Cash flows from operating activities:	'	'	'
Net loss	'	-49,131	-54,371
Adjustments to reconcile net loss to net cash provided (used) by operating activities:	'	'	'
Equity in net income of subsidiary	'	306,601	1,402,737
Compensation cost on allocated ESOP shares	'	71,676	59,750
Compensation cost on allocated RRP shares and stock options	'	81,177	'
(Increase) decrease in other assets	'	1,787	9,602
Increase (decrease) in other liabilities	'	-15,599	17,349
Net cash provided (used) by operating activities	'	396,511	1,435,067
Cash flow from investing activities:	'	'	'
(Increase) decrease in loans	'	43,845	49,510
Investment in bank subsidiary	'	-458,530	-1,382,009
Net cash provided (used) by investing activities	'	-414,685	-1,332,499
Cash flows from financing activities:	'	'	'
Proceeds from issuance of common stock, net of costs	'	'	351,573
Net increase in interest-bearing deposits	'	-5,269	-8,051
Repurchase of common stock	'	-133,080	-389,240
Net cash provided (used) by financing activities	'	-138,349	-45,718
Net increase (decrease) in cash and cash equivalents	'	-156,523	56,850
Cash and cash equivalents, beginning balance	'	378,404	321,554
Cash and cash equivalents, ending balance	'	$221,881	$378,404

Parent_Company_Only_Financial_2

Parent Company Only Financial Statements - Additional Information (Detail) (USD $)	1 Months Ended
	Oct. 13, 2011
Condensed Cash Flow Statements, Captions [Line Items]	'
Company provide loan to ESOP	$63,478
No. of Common stock acquired from ESOP	4,502