Greene County Bancorp (GCBC) 10-K 28 Sep 17 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2017	Sep. 12, 2017	Dec. 31, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	GREENE COUNTY BANCORP INC
Entity Central Index Key	1,070,524
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 66,658,000
Entity Common Stock, Shares Outstanding		8,502,614
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2017

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
ASSETS
Total cash and cash equivalents	$ 16,277	$ 15,895
Long term certificate of deposit	2,145	2,210
Securities available-for-sale, at fair value	91,483	100,123
Securities held-to-maturity, at amortized cost (fair value $228,452 at June 30, 2017; $214,058 at June 30, 2016)	223,830	204,935
Federal Home Loan Bank stock, at cost	2,131	2,752
Loans	634,331	531,290
Allowance for loan losses	(11,022)	(9,485)
Unearned origination fees and costs, net	878	959
Net loans receivable	624,187	522,764
Premises and equipment, net	13,615	14,176
Accrued interest receivable	4,033	3,610
Foreclosed real estate	799	370
Prepaid expenses and other assets	3,791	1,946
Total assets	982,291	868,781
LIABILITIES AND SHAREHOLDERS' EQUITY
Noninterest-bearing deposits	95,929	88,254
Interest-bearing deposits	763,606	650,633
Total deposits	859,535	738,887
Borrowings from Federal Home Loan Bank, short-term	6,900	26,100
Borrowings from Federal Home Loan Bank, long-term	22,650	20,300
Accrued expenses and other liabilities	9,685	9,193
Total liabilities	898,770	794,480
SHAREHOLDERS' EQUITY
Preferred stock, Authorized - 1,000,000 shares; Issued - None	0	0
Common stock, par value $.10 per share; Authorized - 12,000,000 shares; Issued - 8,611,340 shares at June 30, 2017 and 2016; Outstanding - 8,502,614 shares at June 30, 2017, and 8,475,614 shares at June 30, 2016	861	861
Additional paid-in capital	10,990	10,872
Retained earnings	73,072	63,805
Accumulated other comprehensive loss	(992)	(725)
Treasury stock, at cost 108,726 shares at June 30, 2017, and 135,726 shares at June 30, 2016	(410)	(512)
Total shareholders' equity	83,521	74,301
Total liabilities and shareholders' equity	$ 982,291	$ 868,781

Consolidates Statements of Fina

Consolidates Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
ASSETS
Securities held-to-maturity, fair value	$ 228,452	$ 214,058
SHAREHOLDERS' EQUITY
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	12,000,000	12,000,000
Common stock, shares issued (in shares)	8,611,340	8,611,340
Common stock, shares outstanding (in shares)	8,502,614	8,475,614
Treasury stock, shares (in shares)	108,726	135,726

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans	$ 25,884	$ 22,118
Investment securities - taxable	605	566
Mortgage-backed securities	3,420	3,080
Investment securities - tax exempt	3,512	2,990
Interest-bearing deposits and federal funds sold	38	48
Total interest income	33,459	28,802
Interest expense:
Interest on deposits	2,612	2,241
Interest on borrowings	465	340
Total interest expense	3,077	2,581
Net interest income	30,382	26,221
Provision for loan losses	1,911	1,673
Net interest income after provision for loan losses	28,471	24,548
Noninterest income:
Service charges on deposit accounts	3,164	2,880
Debit card fees	2,041	1,824
Investment services	329	383
E-commerce fees	129	97
Other operating income	761	781
Total noninterest income	6,424	5,965
Noninterest expense:
Salaries and employee benefits	11,672	10,490
Occupancy expense	1,549	1,432
Equipment and furniture expense	485	537
Service and data processing fees	1,973	1,912
Computer software, supplies and support	608	443
Advertising and promotion	387	373
FDIC insurance premiums	380	417
Legal and professional fees	875	1,023
Other	2,038	2,244
Total noninterest expense	19,967	18,871
Income before provision for income taxes	14,928	11,642
Provision for income taxes	3,741	2,679
Net income	$ 11,187	$ 8,963
Basic earnings per share (in dollars per share)	$ 1.32	$ 1.06
Basic average shares outstanding (in shares)	8,495,022	8,459,327
Diluted earnings per share (in dollars per share)	$ 1.31	$ 1.06
Diluted average shares outstanding (in shares)	8,513,129	8,476,292
Dividends per share (in dollars per share)	$ 0.38	$ 0.37

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 11,187	$ 8,963
Other comprehensive income:
Unrealized holding (losses) gains on available-for-sale securities, net of income tax (benefit) expense of ($392) and $328, respectively	(612)	520
Accretion of unrealized loss on securities transferred to held-to-maturity, net of income taxes of $1 and $6, respectively	2	9
Pension actuarial gain (loss), net of income tax expense (benefit) of $158 and ($340)	221	(539)
Amortization of pension actuarial losses recognized in salaries and benefits, net of income taxes of $75 and $52, respectively	122	83
Total other comprehensive (loss) income net of taxes	(267)	73
Comprehensive income	$ 10,920	$ 9,036

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Other comprehensive income:
Unrealized holding (losses) gains on available-for-sale securities, income tax (benefit) expense	$ (392)	$ 328
Accretion of unrealized loss on securities transferred to held-to-maturity, income taxes	1	6
Pension actuarial gain (loss), income tax expense (benefit)	158	(340)
Amortization of pension actuarial losses recognized in salaries and benefits, income taxes	$ 75	$ 52

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Jun. 30, 2015	$ 431	$ 11,220	$ 56,696	$ (798)	$ (629)	$ 66,920
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised		76			117	193
Tax benefit of stock based compensation		6				6
2-for-1 stock split	430	(430)				0
Dividends declared			(1,854)			(1,854)
Net income			8,963			8,963
Other comprehensive income, net of taxes				73		73
Balance at Jun. 30, 2016	861	10,872	63,805	(725)	(512)	74,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised		67			102	169
Tax benefit of stock based compensation		51				51
Dividends declared			(1,920)			(1,920)
Net income			11,187			11,187
Other comprehensive income, net of taxes				(267)		(267)
Balance at Jun. 30, 2017	$ 861	$ 10,990	$ 73,072	$ (992)	$ (410)	$ 83,521

Consolidated Statements of Cha8

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	Mar. 15, 2016	Jun. 30, 2016
Stock split ratio	2	2

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net Income	$ 11,187	$ 8,963
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	637	629
Deferred income tax benefit	(259)	(714)
Net amortization of premiums and discounts	825	716
Net amortization of deferred loan costs and fees	457	393
Provision for loan losses	1,911	1,673
Loss on sale of foreclosed real estate	73	177
Excess tax benefit from share based compensation	(51)	(6)
Net (decrease) increase in accrued income taxes	(1,559)	597
Net increase in accrued interest receivable	(422)	(584)
Net decrease in prepaid expenses and other assets	158	202
Net increase in other liabilities	1,091	1,535
Net cash provided by operating activities	14,048	13,581
Securities available-for-sale:
Proceeds from maturities	69,041	47,939
Purchases of securities	(68,194)	(65,364)
Principal payments on securities	6,724	3,996
Securities held-to-maturity:
Proceeds from maturities	17,308	13,376
Purchases of securities	(47,105)	(58,003)
Principal payments on securities	10,145	8,179
Net redemption (purchase) of Federal Home Loan Bank Stock	621	(258)
Purchases of long term certificates of deposit	(425)	(1,225)
Maturity of long term certificate of deposit	490	245
Net increase in loans receivable	(104,505)	(81,718)
Proceeds from sale of foreclosed real estate	212	684
Purchases of premises and equipment	(76)	(290)
Net cash used in investing activities	(115,764)	(132,439)
Cash flows from financing activities
Net (decrease) increase in short-term FHLB advances	(19,200)	3,200
Proceeds from long-term FHLB advances	4,850	1,500
Repayment of long-term FHLB advances	(2,500)	0
Payment of cash dividends	(1,920)	(1,854)
Proceeds from issuance of stock options	169	193
Excess tax benefit from share based compensation	51	6
Net increase in deposits	120,648	116,170
Net cash provided by financing activities	102,098	119,215
Net increase in cash and cash equivalents	382	357
Cash and cash equivalents at beginning of year	15,895	15,538
Cash and cash equivalents at end of year	16,277	15,895
Non-cash investing activities:
Foreclosed loans transferred to other real estate	714	384
Cash paid during period for:
Interest	3,059	2,571
Income taxes	$ 5,559	$ 2,795

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. Summary of significant accounting policies Basis of Presentation The consolidated financial statements include the accounts of Greene County Bancorp, Inc. (the “Company”) and its subsidiaries, The Bank of Greene County (the “Bank”) and Greene Risk Management, Inc., and the Bank’s subsidiaries Greene County Commercial Bank and Greene Property Holdings, Ltd. All material inter-company accounts and transactions have been eliminated. Amounts in the prior year’s consolidated financial statements have been reclassified whenever necessary to conform to the current year’s presentation. These reclassifications had no effect on net income or shareholders’ equity as previously reported. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). These consolidated financial statements consider events that occurred through the date the consolidated financial statements were issued. Nature of Operations Greene County Bancorp, Inc.’s primary business is the ownership and operation of its subsidiaries. The Bank of Greene County has 13 full-service offices and an operations center located in its market area consisting of the Hudson Valley of New York. The Bank of Greene County is primarily engaged in the business of attracting deposits from the general public in The Bank of Greene County’s market area, and investing such deposits, together with other sources of funds, in loans and investment securities. Greene County Commercial Bank’s primary business is to attract deposits from, and provide banking services to, local municipalities. Greene Property Holdings, Ltd. was formed as a New York corporation that has elected under the Internal Revenue Code to be a real estate investment trust. Currently, certain mortgages and loan notes held by The Bank of Greene County are transferred and beneficially owned by Greene Property Holdings, Ltd. The Bank of Greene County continues to service these loans. Greene Risk Management, Inc. was formed in December 2014 as a pooled captive insurance company subsidiary of Greene County Bancorp, Inc., incorporated in the State of Nevada. The purpose of this company is to provide additional insurance coverage for the Company and its subsidiaries related to the operations of the Company for which insurance may not be economically feasible. Charter Greene County Bancorp, Inc. and its parent mutual holding company (the “MHC”) are federally chartered and regulated and examined by the Federal Reserve Board. The Bank of Greene County, the subsidiary of Greene County Bancorp, Inc., is also federally chartered and regulated and examined by the Office of the Comptroller of the Currency (the “OCC”). Greene County Commercial Bank is a New York State-chartered financial institution, regulated and examined by the New York State Banking Department. Greene Property Holdings, Ltd. is a New York corporation. As a federal savings association, The Bank of Greene County must satisfy the qualified thrift lender, or “QTL”, requirement by meeting one of two tests: the Home Owners’ Loan Act (“HOLA”) QTL test or the Internal Revenue Service (IRS) Domestic Building and Loan Association (DBLA) test. The federal savings association may use either test to qualify and may switch from one test to the other. Under the HOLA QTL test, The Bank of Greene County must maintain at least 65% of its “portfolio assets” in “qualified thrift investments” in at least nine of the most recent 12-month period. “Portfolio assets” generally means total assets of a savings institution, less the sum of specified liquid assets up to 20% of total assets, goodwill and other intangible assets, and the value of property used in the conduct of the savings association’s business. “Qualified thrift investments” include various types of loans made for residential and housing purposes, investments related to such purposes, including certain mortgage-backed and related securities, and loans for personal, family, household and certain other purposes up to a limit of 20% of portfolio assets. “Qualified thrift investments” also include 100% of an institution’s credit card loans, education loans and small business loans. The Bank of Greene County also may satisfy the QTL test by qualifying as a “domestic building and loan association” as defined in the Internal Revenue Code. Under the IRS DBLA test, the Bank must meet the business operations test and the 60% of assets test. The business operations test requires that the federal savings association’s business consists primarily of acquiring the savings of the public (75% of its deposits, withdrawable shares, and other obligations must be held by the general public) and investing in loans (more than 75% of its gross income consists of interest on loans and government obligations and various other specified types of operating income that federal savings associations ordinarily earn). For the 60% of assets test, the Bank must maintain at least 60% of its total in “qualified investments” as of the close of the taxable year or, at the option of the taxpayer, may be computed on the basis of the average assets outstanding during the taxable year. A savings association that fails the qualified thrift lender test must either convert to a bank charter or operate under specified restrictions. During the years ended June 30, 2017 and 2016, The Bank of Greene County opted to utilize the HOLA QTL test and satisfied the requirements of this test for the entire 12-month period. Use of 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 materially differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses and the assessment of other-than-temporary security impairment. While management uses available information to recognize losses on loans, future additions to the allowance for loan losses (the “Allowance”) may be necessary, based on changes in economic conditions, asset quality or other factors. In addition, various regulatory authorities, as an integral part of their examination process, periodically review the Allowance. Such authorities may require the Company to recognize additions to the Allowance based on their judgments of information available to them at the time of their examination. Greene County Bancorp, Inc. makes an assessment to determine whether there have been any events or economic circumstances to indicate that a security on which there is an unrealized loss is impaired on an other-than-temporary basis. The Company considers many factors including the severity and duration of the impairment; the intent and ability of the Company to hold the security for a period of time sufficient for a recovery in value; recent events specific to the issuer or industry; and for debt securities, intent to sell the security, whether it is more likely than not we will be required to sell the security before recovery, whether loss is expected, external credit ratings and recent downgrades. Securities on which there is an unrealized loss that is deemed to be other-than-temporary are written down to fair value through earnings. Cash and Cash Equivalents Cash and cash equivalents include cash on hand, amounts due from banks, interest-bearing deposits at other financial institutions, investments (with original maturity of three months or less), and overnight federal funds sold. The amounts of interest-bearing deposits included as cash equivalents at June 30, 2017 and 2016 were $6.1 million and $6.0 million, respectively. Securities Greene County Bancorp, Inc. has classified its investments in debt and equity securities as either available-for-sale or held-to-maturity. Available-for-sale securities are reported at fair value, with net unrealized gains and losses reflected in the accumulated other comprehensive income (loss) component of shareholders’ equity, net of applicable income taxes. Held-to-maturity securities are those debt securities which management has the intent the ability to hold to maturity and are reported at amortized cost. The Company does not have trading securities in its portfolio. Realized gains or losses on security transactions are reported in earnings and computed using the specific identification cost basis. Fair values of securities are based on quoted market prices, where available. Valuation of securities is further described in Note 16, Fair Value Measurements and Fair Value of Financial Instruments When the fair value of a held-to-maturity or available-for-sale security is less than its amortized cost basis, an assessment is made as to whether other-than-temporary impairment (“OTTI”) is present. The Company considers numerous factors when determining whether a potential OTTI exists and the period over which the debt security is expected to recover. The principal factors considered are (1) the length of time and the extent to which the fair value has been less than the amortized cost basis, (2) the financial condition of the issuer (and guarantor, if any) and adverse conditions specifically related to the security, industry or geographic area, (3) failure of the issuer of the security to make scheduled interest or principal payments, (4) any changes to the rating of the security by a rating agency, and (5) the presence of credit enhancements, if any, including the guarantee of the federal government or any of its agencies. For debt securities, OTTI is considered to have occurred if (1) the Company intends to sell the security before recovery of its amortized cost basis, (2) it is more likely than not the Company will be required to sell the security before recovery of its amortized cost basis, or (3) if the present value of expected cash flows is not sufficient to recover the entire amortized cost basis. In determining the present value of expected cash flows, the Company discounts the expected cash flows at the effective interest rate implicit in the security at the date of acquisition. In estimating cash flows expected to be collected, the Company uses available information with respect to security prepayment speeds, default rates and severity. In determining whether OTTI has occurred for equity securities, the Company considers the applicable factors described above and 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. For debt securities, credit-related OTTI is recognized in earnings while noncredit related OTTI on securities not expected to be sold is recognized in other comprehensive income/loss (“OCI”). Credit-related OTTI is measured as the difference between the present value of an impaired security’s expected cash flows and its amortized cost basis. Noncredit-related OTTI is measured as the difference between the fair value of the security and its amortized cost less any credit-related losses recognized. For securities classified as held-to-maturity, the amount of OTTI recognized in OCI is accreted to the credit-adjusted expected cash flow amounts of the securities over future periods. For equity securities, the entire amount of OTTI is recognized in earnings. Loans Loans are stated at unpaid principal balances, less the allowance for loan losses and net deferred loan origination fees and costs. Interest on loans is accrued and credited to income based upon the principal amount outstanding. Unearned discount on installment loans is recognized as income over the term of the loan, principally using a method that approximates the effective yield method. Nonrefundable loan fees and related direct costs are deferred and amortized over the life of the loan as an adjustment to loan yield using the effective interest method. Allowance for Loan Losses The allowance for loan losses is maintained by a provision for loan losses charged to expense, reduced by net charge-offs and increased by recoveries of loans previously charged off. The level of the allowance is based on management’s evaluation of the collectability of the loan portfolio, including the nature of the portfolio, credit concentrations, trends in historical loss experience, specific impaired loans, payment status of the loan and economic conditions. The Bank of Greene County considers smaller balance residential mortgages, home equity loans, commercial real estate, business loans and installment loans to customers as small, homogeneous loans, which are evaluated for impairment collectively based on historical loss experience. Larger balance residential, commercial real estate mortgage and business loans are reviewed individually and considered impaired if it is probable that The Bank of Greene County will not be able to collect scheduled payments of principal and interest when due, according to the contractual terms of the loan agreements. The measurement of impaired loans is generally based on the fair value of the underlying collateral, less estimated costs to sell. The majority of The Bank of Greene County loans, including most nonaccrual loans, are small homogenous loan types adequately supported by collateral. As a result, the level of impaired loans may only be a portion of nonaccrual loans. Loans that are delinquent or slow paying may not be impaired. Management considers the payment status of loans in the process of evaluating the adequacy of the allowance for loan losses among other factors. Based on this evaluation, a delinquent loan’s risk rating may be downgraded to either pass-watch, special mention, or substandard, and the allocation of the allowance for loan loss is based upon the risk associated with such designation. Income Recognition on Impaired and Nonaccrual loans The Bank of Greene County generally places a loan, including impaired loans, on nonaccrual status when it is specifically determined to be impaired or when principal and interest is delinquent for 90 days or more. Any unpaid interest previously accrued on these loans is reversed from income. When a loan is specifically determined to be impaired, collection of interest and principal are generally applied as a reduction to principal outstanding until the collection of the remaining balance is reasonably assured. Interest income on all nonaccrual loans is recognized on a cash basis. Foreclosed Real Estate (FRE) FRE consists of properties acquired through mortgage loan foreclosure proceedings or in full or partial satisfaction of loans. FRE is initially recorded at fair value (less estimated costs to sell) at the date the collateral is acquired establishing a new cost basis and any shortfall is charged to the allowance for loan losses at this time. Subsequently, management reviews the value of FRE and write-downs, if any, are charged to expense. All expenses and income related to FRE are included in consolidated results of operations as part of noninterest expense. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using principally the straight-line method over the estimated useful lives of the related assets (39 years for building and improvements, 3-8 years for furniture and equipment). Maintenance and repairs are typically charged to expense when incurred. Gains and losses from sales or other dispositions of premises and equipment are included in consolidated results of operations. Leasehold improvements are amortized over the lesser of the related terms of the leases or their useful life. Treasury Stock Common stock repurchases are recorded at cost and then held as treasury stock. From time to time, Greene County Bancorp, Inc. may repurchase shares of common stock under an approved plan if, in its judgment, such shares are an attractive investment, in view of the current price at which the common stock is trading relative to Greene County Bancorp, Inc.’s earnings per share, book value per share and general market and economic factors. The Company has a stock repurchase program which allows for the repurchase of up to 184,692 shares. As of June 30, 2017, 124,956 shares had been repurchased under this plan. The Company currently does not intend to repurchase any additional shares under this stock repurchase program. Common stock may also be acquired in order to have shares available for issuance under the Stock Option Plans. For more information regarding these plans see Note 10, Stock-Based Compensation Federal Home Loan Bank Stock Federal law requires a member institution of the Federal Home Loan Bank (“FHLB”) system to hold stock of its district FHLB according to a predetermined formula. This stock is restricted in that it can only be sold to the FHLB or to another member institution, and all sales of FHLB stock must be at par. As a result of these restrictions, FHLB stock is carried at cost. FHLB stock is held as a long-term investment and its value is determined based on the ultimate recoverability of the par value. Impairment of this investment is evaluated quarterly and is a matter of judgment that reflects management’s view of the FHLB’s long-term performance, which includes factors such as the following: its operating performance; the severity and duration of declines in the fair value of its net assets related to its capital stock amount; its commitment to make payments required by law or regulation and the level of such payments in relation to its operating performance; the impact of legislative and regulatory changes on the FHLB, and accordingly, on the members of the FHLB; and its liquidity and funding position. After evaluating these considerations, Greene County Bancorp, Inc. concluded that the par value of its investment in FHLB stock will be recovered and, therefore, no other-than-temporary impairment charge was recorded during the years ended June 30, 2017 or 2016. Advertising Greene County Bancorp, Inc. follows a policy of charging the costs of advertising to expense as incurred. Advertising costs included in other operating expenses were $387,000 and $373,000 for the years ended June 30, 2017 and 2016, respectively. Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Off-Balance Sheet Credit Related Financial Instruments In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under lines of credit. Such financial instruments are recorded when they are funded. Income Taxes Provisions for income taxes are based on taxes currently payable or refundable and deferred income taxes on temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements. Deferred tax assets and liabilities are reported at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized or settled. Earnings Per Share (EPS) Basic EPS is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in a manner similar to that of basic earnings per share except that the weighted-average number of common shares outstanding is increased to include the number of incremental common shares that would have been outstanding under the treasury stock method if all potentially dilutive common shares (such as stock options) issued became vested during the period. Unallocated common shares held by the ESOP are not included in the weighted-average number of common shares outstanding for either the basic or diluted earnings per share calculations. Impact of Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standard Update (“ASU) (ASU 2014-09) to amend its guidance on “Revenue from Contracts with Customers (Topic 606). The objective of the ASU is to align the recognition of revenue with the transfer of promised goods or services provided to customers in an amount that reflects the consideration which the entity expects to be entitled in exchange for those goods or services. This ASU will replace most existing revenue recognition guidance under GAAP when it becomes effective. In August, 2015, the FASB issued an amendment (ASU 2015-14) which defers the effective date of this new guidance by one year. More detailed implementation guidance on Topic 606 was issued in March 2016 (ASU 2016-08), April 2016 (ASU 2016-10), May 2016 (ASU 2016-12), December 2016 (ASU 2016-20) and February 2017 (ASU 2017-05), and the effective date and transition requirements for these ASUs are the same as the effective date and transition requirements of ASU 2014-09. The amendments in ASU 2014-09 are effective for public business entities for annual periods, beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In August 2014, the FASB issued an amendment (ASU 2014-14) to its guidance on “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40)”. The objective of the ASU is to reduce the diversity in how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure, to provide more decision-useful information about a creditor’s foreclosed mortgage loans that are expected to be recovered, at least in part, through government guarantees. The amendments in this Update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Public entities would be permitted to elect to early adopt for annual reporting periods beginning after December 15, 2016. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In January 2015, the FASB issued an Update (ASU 2015-01) to its guidance on “Income Statement-Extraordinary and Unusual Items (Subtopic 225-20)”. The objective of the ASU is to simplify the income statement presentation by eliminating the concept of extraordinary items, and will align GAAP more closely with International Accounting Standards which prohibits the presentation and disclosure of extraordinary items. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The adoption of this guidance did not have a material impact on our consolidated results of operations or financial position. In January 2016, the FASB issued an Update (ASU 2016-01) to its guidance on “Financial Instruments (Subtopic 825-10)”. This amendment addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. These amendments require equity securities to be measured at fair value with changes in the fair value to be recognized through net income. The amendments also simplify the impairment assessment of equity investments without readily determinable fair values by requiring assessment for impairment qualitatively at each reporting period. For public business entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption of the amendments in this Update is not permitted. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In February 2016, the FASB issued an Update (ASU 2016-02) to its guidance on “Leases (Topic 842)”. The new leases standard applies a right-of-use (ROU) model that requires a lessee to record, for all leases with a lease term of more than 12 months, an asset representing its right to use the underlying asset and a liability to make lease payments. For leases with a term of 12 months or less, a practical expedient is available whereby a lessee may elect, by class of underlying asset, not to recognize an ROU asset or lease liability. The new leases standard requires a lessor to classify leases as either sales-type, direct financing or operating, similar to existing U.S. GAAP. Classification depends on the same five criteria used by lessees plus certain additional factors. The subsequent accounting treatment for all three lease types is substantially equivalent to existing U.S. GAAP for sales-type leases, direct financing leases, and operating leases. However, the new standard updates certain aspects of the lessor accounting model to align it with the new lessee accounting model, as well as with the new revenue standard under Topic 606. Lessees and lessors are required to provide certain qualitative and quantitative disclosures to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The adoption of this ASU will result in a gross up of the Consolidated Statements of Financial Condition for right-of-use assets and associated lease liabilities for operating leases in which the Company is the lessee. The Company is evaluating the significance and other effects of adoption on the consolidated financial statements and related disclosures. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations. Branch building leases have been reviewed and are considered immaterial to the financial statements; there are no equipment leases to consider. In March 2016, the FASB issued an Update (ASU 2016-09) to its guidance on “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”. This amendment is intended to simplify the accounting for stock compensation. The areas for simplification in this Update involve several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public business entities, the amendments in this Update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any entity in any interim or annual period. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In June 2016, the FASB issued an Update (ASU 2016-13) to its guidance on “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 requires credit losses on most financial assets measured at amortized cost and certain other instruments to be measured using an expected credit loss model (referred to as the current expected credit loss (CECL) model). Under this model, entities will estimate credit losses over the entire contractual term of the instrument (considering estimated prepayments, but not expected extensions or modifications unless reasonable expectation of a troubled debt restructuring exists) from the date of initial recognition of that instrument. The ASU also replaces the current accounting model for purchased credit impaired loans and debt securities. The allowance for credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination (“PCD assets”), should be determined in a similar manner to other financial assets measured on an amortized cost basis. However, upon initial recognition, the allowance for credit losses is added to the purchase price (“gross up approach”) to determine the initial amortized cost basis. The subsequent accounting for PCD financial assets is the same expected loss model described above. Further, the ASU made certain targeted amendments to the existing impairment model for available-for-sale (AFS) debt securities. For an AFS debt security for which there is neither the intent nor a more-likely-than-not requirement to sell, an entity will record credit losses as an allowance rather than a write-down of the amortized cost basis. For public business entities that are U.S. Securities and Exchange Commission (SEC) filers, the amendments in this Update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this Update earlier as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply the amendments in this Update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). The Company is currently evaluating the potential impact on our consolidated results of operations or financial position. The initial adjustment will not be reported in earnings and therefore will not have any material impact on our consolidated results of operations, but it is expected that it will have an impact on our consolidated financial position at the date of adoption of this Update. At this time, we have not calculated the estimated impact that this Update will have on our Allowance for Loan Losses, however, we anticipate it will have a significant impact on the methodology process we utilize to calculate the allowance. Alternative methodologies and software vendors are currently being considered. Data requirements and integrity are being reviewed and enhancements incorporated into standard processes. The Company is in the early stages of evaluation and implementation of the guidance. In November 2016, the FASB issued an Update (ASU 2016-18) to its guidance on “Statement of Cash Flows (Topic 230) Restricted Cash addresses diversity in practice from entities classifying and presenting transfers between cash and restricted cash as operating, investing or financing activities or as a combination of those activities in the statement of cash flows. The ASU requires entities to show the changes in the total cash, cash equivalents, restricted cash and restricted cash equivalents in the Statement of Cash Flows. As a result, transfers between such categories will no longer be presented in the Statement of Cash Flows. ASU 2016-18 is effective for the fiscal years beginning after December 31, 2017, and interim periods within those fiscal years. Early adoption is permitted provided all amendments are adopted in the same period. Management is evaluating the effect that this guidance will have on consolidated financial statements and disclosures. In March 2017, the FASB issued an Update (ASU 2017-08) to its guidance on “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20) related to premium amortization on purchased callable debt securities. The amendments in this Update shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. For public business entities, the amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an

Balances at Other Banks

Balances at Other Banks	12 Months Ended
	Jun. 30, 2017
Balances at Other Banks [Abstract]
Balances at Other Banks	Note 2. Balances at other banks The Bank of Greene County is required to maintain certain reserves of vault cash and/or deposits with the Federal Reserve Bank. The amount of this reserve requirement, included in cash and due from banks, was $2.1 million and $1.7 million at June 30, 2017 and 2016, respectively.

Securities

Securities	12 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Securities	Note 3. Securities Greene County Bancorp, Inc.’s current policies generally limit securities investments to U.S. Government and securities of government sponsored enterprises, federal funds sold, municipal bonds, corporate debt obligations and certain mutual funds. In addition, the Company’s policies permit investments in mortgage-backed securities, including securities issued and guaranteed by Fannie Mae, Freddie Mac, and GNMA, and collateralized mortgage obligations issued by these entities. As of June 30, 2017, all mortgage-backed securities including collateralized mortgage obligations were securities of government sponsored enterprises, no private-label mortgage-backed securities or collateralized mortgage obligations were held in the securities portfolio. The Company’s investments in state and political subdivisions securities generally are municipal obligations that are general obligations supported by the general taxing authority of the issuer, and in some cases are insured. The obligations issued by school districts are supported by state aid. Primarily, these investments are issued by municipalities within New York State. The Company’s current securities investment strategy utilizes a risk management approach of diversified investing among three categories: short-, intermediate- and long-term. The emphasis of this approach is to increase overall investment securities yields while managing interest rate risk. The Company will only invest in high quality securities as determined by management’s analysis at the time of purchase. The Company does not engage in any derivative or hedging transactions, such as interest rate swaps or caps. Securities at June 30, 2017 consisted of the following: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Securities available-for-sale: U.S. government sponsored enterprises $ 4,566 $ 151 $ - $ 4,717 State and political subdivisions 57,885 227 - 58,112 Mortgage-backed securities-residential 4,868 72 27 4,913 Mortgage-backed securities-multi-family 20,344 483 62 20,765 Asset-backed securities 1 - - 1 Corporate debt securities 2,765 29 3 2,791 Total debt securities 90,429 962 92 91,299 Equity securities 62 122 - 184 Total securities available-for-sale 90,491 1,084 92 91,483 Securities held-to-maturity: U.S. government sponsored enterprises 6,000 - 53 5,947 State and political subdivisions 115,805 3,434 95 119,144 Mortgage-backed securities-residential 10,798 274 2 11,070 Mortgage-backed securities-multi-family 88,702 1,259 199 89,762 Corporate debt securities 1,000 - 5 995 Other securities 1,525 21 12 1,534 Total securities held-to-maturity 223,830 4,988 366 228,452 Total securities $ 314,321 $ 6,072 $ 458 $ 319,935 Securities at June 30, 2016 consisted of the following: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Securities available-for-sale: U.S. government sponsored enterprises $ 4,587 $ 304 $ - $ 4,891 State and political subdivisions 60,491 8 - 60,499 Mortgage-backed securities-residential 6,360 185 5 6,540 Mortgage-backed securities-multi-family 22,594 1,285 - 23,879 Asset-backed securities 5 - - 5 Corporate debt securities 4,028 129 - 4,157 Total debt securities 98,065 1,911 5 99,971 Equity securities 62 90 - 152 Total securities available-for-sale 98,127 2,001 5 100,123 Securities held-to-maturity: U.S. government sponsored enterprises 2,000 32 - 2,032 State and political subdivisions 99,040 5,003 3 104,040 Mortgage-backed securities-residential 13,543 606 - 14,149 Mortgage-backed securities-multi-family 87,204 3,471 4 90,671 Corporate debt securities 1,000 - - 1,000 Other securities 2,148 18 - 2,166 Total securities held-to-maturity 204,935 9,130 7 214,058 Total securities $ 303,062 $ 11,131 $ 12 $ 314,181 The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2017. Less Than 12 Months More Than 12 Months Total (In thousands, except number of securities) Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Securities available-for-sale: Mortgage-backed securities-residential $ 1,164 $ 27 1 $ - $ - - $ 1,164 $ 27 1 Mortgage-backed securities-multi-family 6,488 62 4 - - - 6,488 62 4 Corporate debt securities 760 3 2 - - - 760 3 2 Total securities available for sale 8,412 92 7 - - - 8,412 92 7 Securities held to maturity: U.S. government sponsored enterprises 5,947 53 2 - - - 5,947 53 2 State and political subdivisions 8,976 76 64 514 19 6 9,490 95 70 Mortgage-backed securities-residential 1,864 2 1 - - - 1,864 2 1 Mortgage-backed securities-multi-family 23,823 199 15 - - - 23,823 199 15 Corporate debt securities 995 5 1 - - - 995 5 1 Other securities 467 11 1 74 1 1 541 12 2 Total securities held to maturity 42,072 346 84 588 20 7 42,660 366 91 Total securities $ 50,484 $ 438 91 $ 588 $ 20 7 $ 51,072 $ 458 98 The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2016. Less Than 12 Months More Than 12 Months Total (In thousands, except number of securities) Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Securities available-for-sale: Mortgage-backed securities-residential $ 924 $ 5 1 $ - $ - - $ 924 $ 5 1 Total securities available-for-sale 924 5 1 - - - 924 5 1 Securities held-to-maturity: State and political subdivisions 272 2 1 175 1 2 447 3 3 Mortgage-backed securities-multi-family 499 4 4 - - - 499 4 4 Total securities held-to-maturity 771 6 5 175 1 2 946 7 7 Total securities $ 1,695 $ 11 6 $ 175 $ 1 2 $ 1,870 $ 12 8 Management evaluated these securities considering the factors as outlined in Note 1 of these consolidated financial statements, and based on this evaluation, the Company does not consider these investments to be other-than-temporarily impaired at June 30, 2017. Management believes that the reasons for the decline in fair value are due to interest rates, widening credit spreads and market illiquidity at the reporting date. There were no transfers of securities available-for-sale to held-to-maturity during the year ended June 30, 2017 or 2016. During the years ended June 30, 2017 and 2016, there were no sales of securities and no gains or losses were recognized. There were no other-than-temporary impairment losses recognized during the years ended June 30, 2017 and 2016. The estimated fair values of debt securities at June 30, 2017, by contractual maturity are shown below. Expected maturities may differ from contractual maturities, because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. (In thousands) Available-for-sale debt securities Amortized Cost Fair Value Within one year $ 60,387 $ 60,641 After one year through five years 4,829 4,979 After five years through ten years - - After ten years - - Total available-for-sale debt securities 65,216 65,620 Mortgage-backed and asset-backed securities 25,213 25,679 Equity securities 62 184 Total available-for-sale securities 90,491 91,483 Held-to-maturity debt securities Within one year 17,403 17,642 After one year through five years 56,441 57,713 After five years through ten years 38,309 39,415 After ten years 12,177 12,850 Total held-to-maturity debt securities 124,330 127,620 Mortgage-backed 99,500 100,832 Total held-to-maturity securities 223,830 228,452 Total securities $ 314,321 $ 319,935 As of June 30, 2017 and 2016, respectively, securities with an aggregate fair value of $305.7 million and $291.6 million were pledged as collateral for deposits in excess of FDIC insurance limits for various municipalities placing deposits with Greene County Commercial Bank. As of June 30, 2017 and 2016, securities with an aggregate fair value of $2.8 million and $4.2 million, respectively, were pledged as collateral for potential borrowings at the Federal Reserve Bank discount window. Greene County Bancorp, Inc. did not participate in any securities lending programs during the years ended June 30, 2017 or 2016.

Loans

Loans	12 Months Ended
	Jun. 30, 2017
Loans [Abstract]
Loans	Note 4. Loans Loan segments and classes at June 30, 2017 and 2016 are summarized as follows: At June 30, (In thousands) 2017 2016 Residential real estate: Residential real estate $ 245,331 $ 234,992 Residential construction and land 7,160 5,575 Multi-family 9,199 3,918 Commercial real estate: Commercial real estate 257,964 192,678 Commercial construction 28,430 20,159 Consumer loan: Home equity 21,076 20,893 Consumer installment 4,790 4,350 Commercial loans 60,381 48,725 Total gross loans 634,331 531,290 Allowance for loan losses (11,022 ) (9,485 ) Deferred fees and costs 878 959 Loans receivable, net $ 624,187 $ 522,764 At June 30, 2017 and 2016, loans to related parties including officers and directors were immaterial as a percentage of our loan portfolio. Credit Quality Indicators Management closely monitors the quality of the loan portfolio and has established a loan review process designed to help grade the quality and profitability of the Company’s loan portfolio. The credit quality grade helps management make a consistent assessment of each loan relationship’s credit risk. Consistent with regulatory guidelines, The Bank of Greene County provides for the classification of loans considered being of lesser quality. Such ratings coincide with the “Substandard,” “Doubtful” and “Loss” classifications used by federal regulators in their examination of financial institutions. Generally, an asset is considered Substandard if it is inadequately protected by the current net worth and paying capacity of the obligors and/or the collateral pledged. Substandard assets include those characterized by the distinct possibility that the insured financial institution will sustain some loss if the deficiencies are not corrected. Assets classified as Doubtful have all the weaknesses inherent in assets classified Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, highly questionable and improbable. Assets classified as Loss are those considered uncollectible and of such little value that their continuance as assets without the establishment of a full loss reserve and/or charge-off is not warranted. Assets that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but otherwise possess weaknesses are designated “Special Mention.” Management also maintains a listing of loans designated “Watch.” These loans represent borrowers with declining earnings, strained cash flow, increasing leverage and/or weakening market fundamentals that indicate above average risk. When The Bank of Greene County classifies problem assets as either Substandard or Doubtful, it generally establishes a specific valuation allowance or “loss reserve” in an amount deemed prudent by management. General allowances represent loss allowances that have been established to recognize the inherent risk associated with lending activities, but which, unlike specific allowances, have not been allocated to particular loans. When The Bank of Greene County identifies problem loans as being impaired, it is required to evaluate whether the Bank will be able to collect all amounts due either through repayments or the liquidation of the underlying collateral. If it is determined that impairment exists, the Bank is required either to establish a specific allowance for losses equal to the amount of impairment of the assets, or to charge-off such amount. The Bank of Greene County’s determination as to the classification of its loans and the amount of its valuation allowance is subject to review by its regulatory agencies, which can order the establishment of additional general or specific loss allowances. The Bank of Greene County reviews its portfolio monthly to determine whether any assets require classification in accordance with applicable regulations. The Bank primarily has four segments within its loan portfolio that it considers when measuring credit quality: residential real estate loans, commercial real estate loans, consumer loans and commercial loans. The residential real estate portfolio consists of residential, construction, and multi-family loan classes. Commercial real estate loans consist of commercial real estate and commercial construction loan classes. Consumer loans consist of home equity loan and consumer installment loan classes. The inherent risk within the loan portfolio varies depending upon each of these loan types. The Bank of Greene County’s primary lending activity is the origination of residential mortgage loans, including home equity loans, which are collateralized by residences. Generally, residential mortgage loans are made in amounts up to 89.9% of the appraised value of the property. However, The Bank of Greene County will originate residential mortgage loans with loan-to-value ratios of up to 95.0%, with private mortgage insurance. In the event of default by the borrower, The Bank of Greene County will acquire and liquidate the underlying collateral. By originating the loan at a loan-to-value ratio of 89.9% or less or obtaining private mortgage insurance, The Bank of Greene County limits its risk of loss in the event of default. However, the market values of the collateral may be adversely impacted by declines in the economy. Home equity loans may have an additional inherent risk if The Bank of Greene County does not hold the first mortgage. The Bank of Greene County may stand in a secondary position in the event of collateral liquidation resulting in a greater chance of insufficiency to meet all obligations. Construction lending generally involves a greater degree of risk than other residential mortgage lending. The repayment of the construction loan is, to a great degree, dependent upon the successful and timely completion of the construction of the subject property within specified cost limits. The Bank of Greene County completes inspections during the construction phase prior to any disbursements. The Bank of Greene County limits its risk during the construction as disbursements are not made until the required work for each advance has been completed. Construction delays may further impair the borrower’s ability to repay the loan. Loans collateralized by commercial real estate, and multi-family dwellings, such as apartment buildings generally are larger than residential loans and involve a greater degree of risk. Commercial real estate loans often involve large loan balances to single borrowers or groups of related borrowers. Payments on these loans depend to a large degree on the results of operations and management of the properties or underlying businesses, and may be affected to a greater extent by adverse conditions in the real estate market or the economy in general. Accordingly, the nature of commercial real estate loans makes them more difficult for management to monitor and evaluate. Consumer loans generally have shorter terms and higher interest rates than residential mortgage loans. In addition, consumer loans expand the products and services offered by The Bank of Greene County to better meet the financial services needs of its customers. Consumer loans generally involve greater credit risk than residential mortgage loans because of the difference in the nature of the underlying collateral. Repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment of the outstanding loan balance because of the greater likelihood of damage, loss or depreciation in the underlying collateral. The remaining deficiency often does not warrant further substantial collection efforts against the borrower beyond obtaining a deficiency judgment. In addition, consumer loan collections depend on the borrower’s personal financial stability. Furthermore, the application of various federal and state laws, including federal and state bankruptcy and insolvency laws, may limit the amount that can be recovered on such loans. Commercial lending generally involves greater risk than residential mortgage lending and involves risks that are different from those associated with residential and commercial real estate mortgage lending. Real estate lending is generally considered to be collateral-based, with loan amounts based on fixed loan-to-collateral values, and liquidation of the underlying real estate collateral is viewed as the primary source of repayment in the event of borrower default. Although commercial loans may be collateralized by equipment or other business assets, the liquidation of collateral in the event of a borrower default is often an insufficient source of repayment because equipment and other business assets may be obsolete or of limited use, among other things. Accordingly, the repayment of a commercial loan depends primarily on the creditworthiness of the borrower (and any guarantors), while liquidation of collateral is a secondary and often insufficient source of repayment. Loan balances by internal credit quality indicator as of June 30, 2017 are shown below. (In thousands Performing Watch Special Mention Substandard Total Residential real estate $ 242,592 $ 813 $ 91 $ 1,835 $ 245,331 Residential construction and land 7,160 - - - 7,160 Multi-family 9,110 - - 89 9,199 Commercial real estate 255,090 419 404 2,051 257,964 Commercial construction 28,254 - - 176 28,430 Home equity 20,858 - - 218 21,076 Consumer installment 4,770 10 - 10 4,790 Commercial loans 59,030 - 60 1,291 60,381 Total gross loans $ 626,864 $ 1,242 $ 555 $ 5,670 $ 634,331 Loan balances by internal credit quality indicator as of June 30, 2016 are shown below. (In thousands Performing Watch Special Mention Substandard Total Residential real estate $ 232,321 $ 757 $ 94 $ 1,820 $ 234,992 Residential construction and land 5,575 - - - 5,575 Multi-family 3,820 - - 98 3,918 Commercial real estate 190,293 52 531 1,802 192,678 Commercial construction 20,159 - - - 20,159 Home equity 20,555 321 12 5 20,893 Consumer installment 4,340 10 - - 4,350 Commercial loans 47,598 26 8 1,093 48,725 Total gross loans $ 524,661 $ 1,166 $ 645 $ 4,818 $ 531,290 The Company had no loans classified Doubtful or Loss at June 30, 2017 or 2016. Nonaccrual Loans Management places loans on nonaccrual status once the loans have become 90 days or more delinquent. A nonaccrual loan is defined as a loan in which collectability is questionable and therefore interest on the loan will no longer be recognized on an accrual basis. A loan is not placed back on accrual status until the borrower has demonstrated the ability and willingness to make timely payments on the loan. A loan does not have to be 90 days delinquent in order to be classified as nonaccrual. Nonaccrual loans consisted primarily of loans secured by real estate at June 30, 2017 and 2016. Loans on nonaccrual status totaled $3.6 million at June 30, 2017 of which $1.6 million were in the process of foreclosure. At June 30, 2017, there were twelve residential loans in the process of foreclosure totaling $967,000. Included in nonaccrual loans were $1.9 million of loans which were less than 90 days past due at June 30, 2017, but have a recent history of delinquency greater than 90 days past due. These loans will be returned to accrual status once they have demonstrated a history of timely payments. Included in total loans past due were $179,000 of loans which were making payments pursuant to forbearance agreements. Under the forbearance agreements, the customers have made arrangements with the Bank to bring the loans current over a specified period of time (resulting in an insignificant delay in repayment). During this term of the forbearance agreement, the Bank has agreed not to continue foreclosure proceedings. Loans on nonaccrual status totaled $3.3 million at June 30, 2016 of which $1.5 million were in the process of foreclosure. At June 30, 2016, there were nine residential loans in the process of foreclosure totaling $867,000. Included in nonaccrual loans were $1.9 million of loans which were less than 90 days past due at June 30, 2016, but have a recent history of delinquency greater than 90 days past due. The following table sets forth information regarding delinquent and/or nonaccrual loans as of June 30, 2017: (In thousands) 30-59 days 60-89 90 days past due Total Current Total Loans Loans on Non- accrual Residential real estate $ 2,088 $ 515 $ 935 $ 3,538 $ 241,793 $ 245,331 $ 1,240 Residential construction and land - - - - 7,160 7,160 - Multi-family - - - - 9,199 9,199 - Commercial real estate 74 1,070 540 1,684 256,280 257,964 1,452 Commercial construction - 176 - 176 28,254 28,430 176 Home equity 220 186 33 439 20,637 21,076 218 Consumer installment 22 10 10 42 4,748 4,790 10 Commercial loans 18 186 202 406 59,975 60,381 476 Total gross loans $ 2,422 $ 2,143 $ 1,720 $ 6,285 $ 628,046 $ 634,331 $ 3,572 The following table sets forth information regarding delinquent and/or nonaccrual loans as of June 30, 2016: (In thousands) 30-59 days 60-89 90 days past due Total Current Total Loans Loans on Non- accrual Residential real estate $ 1,533 $ 637 $ 938 $ 3,108 $ 231,884 $ 234,992 $ 1,207 Residential construction and land - - - - 5,575 5,575 - Multi-family 47 - - 47 3,871 3,918 - Commercial real estate 324 793 590 1,707 190,971 192,678 1,899 Commercial construction - - - - 20,159 20,159 - Home equity 17 321 17 355 20,538 20,893 18 Consumer installment 34 10 - 44 4,306 4,350 - Commercial loans 392 112 - 504 48,221 48,725 202 Total gross loans $ 2,347 $ 1,873 $ 1,545 $ 5,765 $ 525,525 $ 531,290 $ 3,326 The Bank of Greene County had accruing loans delinquent 90 days or more totaling $69,000 and $77,000 as of June 30, 2017 and 2016, respectively. The loans delinquent more than 90 days and accruing consist of loans that are well collateralized and the borrowers have demonstrated the ability and willingness to pay. The borrowers have made arrangements with the Bank to bring the loans current within a specified time period and have made a series of payments as agreed. The table below details additional information related to nonaccrual loans: For the years ended June 30, (In thousands) 2017 2016 Interest income that would have been recorded if loans had been performing in accordance with original terms $ 227 $ 247 Interest income that was recorded on nonaccrual loans 148 142 Impaired Loan Analysis The Company identifies impaired loans and measures the impairment in accordance with FASB ASC subtopic “ Receivables – Loan Impairment.” The tables below detail additional information on impaired loans at the date or periods indicated: As of June 30, 2017 For the year ended June 30, 2017 (In thousands) Recorded Investment Unpaid Principal Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential real estate $ - $ - $ - $ 176 $ - Commercial real estate 809 809 - 704 33 Home equity 186 186 - 64 9 Commercial loans 186 186 - 111 8 Total impaired loans with no allowance 1,181 1,181 - 1,055 50 With an allowance recorded: Residential real estate 1,455 1,455 278 1,302 51 Commercial real estate 440 440 135 922 34 Commercial construction 176 176 23 15 - Commercial loans - - - 41 2 Total impaired loans with allowance 2,071 2,071 436 2,280 87 Total impaired loans: Residential real estate 1,455 1,455 278 1,478 51 Commercial real estate 1,249 1,249 135 1,626 67 Commercial construction 176 176 23 15 - Home equity 186 186 - 64 9 Commercial loans 186 186 - 152 10 Total impaired loans $ 3,252 $ 3,252 $ 436 $ 3,335 $ 137 As of June 30, 2016 For the year ended June 30, 2016 (In thousands) Recorded Investment Unpaid Principal Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential real estate $ 266 $ 266 $ - $ 243 $ 5 Commercial real estate 1,024 1,231 - 1,085 29 Home equity 5 5 - 48 1 Total impaired loans with no allowance 1,295 1,502 - 1,376 35 With an allowance recorded: Residential real estate 1,457 1,457 267 1,411 57 Commercial real estate 405 405 61 487 25 Commercial loans 85 85 2 89 5 Total impaired loans with allowance 1,947 1,947 330 1,987 87 Total impaired loans: Residential real estate 1,723 1,723 267 1,654 62 Commercial real estate 1,429 1,636 61 1,572 54 Home equity 5 5 - 48 1 Commercial loans 85 85 2 89 5 Total impaired loans $ 3,242 $ 3,449 $ 330 $ 3,363 $ 122 There were no loans that have been modified as a troubled debt restructuring during the years ended June 30, 2017 or 2016. There were no loans that had been modified as a troubled debt restructuring during the twelve months prior to June 30, 2016 or 2015 which have subsequently defaulted during the years ended June 30, 2017 or 2016, respectively. Allowance for Loan Losses The allowance for loan losses is established through a provision for loan losses based on management’s evaluation of the risk inherent in the loan portfolio, the composition of the loan portfolio, specific impaired loans and current economic conditions. Such evaluation, which includes a review of certain identified loans on which full collectability may not be reasonably assured, considers among other matters, the estimated net realizable value or the fair value of the underlying collateral, economic conditions, payment status of the loan, historical loan loss experience and other factors that warrant recognition in providing for the loan loss allowance. In addition, various regulatory agencies, as an integral part of their examination process, periodically review The Bank of Greene County’s allowance for loan losses. Such agencies may require The Bank of Greene County to recognize additions to the allowance based on their judgment about information available to them at the time of their examination. The Bank of Greene County considers smaller balance residential mortgages, home equity loans, commercial loans and installment loans to customers as small, homogeneous loans, which are evaluated for impairment collectively based on historical loss experience. Larger balance residential, commercial mortgage and business loans are viewed individually and considered impaired if it is probable that The Bank of Greene County will not be able to collect scheduled payments of principal and interest when due, according to the contractual terms of the loan agreements. The measurement of impaired loans is generally based on the fair value of the underlying collateral. The Bank of Greene County charges loans off against the allowance for credit losses when it becomes evident that a loan cannot be collected within a reasonable amount of time or that it will cost the Bank more than it will receive, and all possible avenues of repayment have been analyzed, including the potential of future cash flow, the value of the underlying collateral, and strength of any guarantors or co-borrowers. Generally, consumer loans and smaller business loans (not secured by real estate) in excess of 90 days are charged-off against the allowance for loan losses, unless equitable arrangements are made. For loans secured by real estate, a charge-off is recorded when it is determined that the collection of all or a portion of a loan may not be collected and the amount of that loss can be reasonably estimated. The following tables set forth the activity and allocation of the allowance for loan losses by loan class during and at the periods indicated. The allowance is allocated to each loan class based on historical loss experience, current economic conditions, and other considerations. Activity for the year ended June 30, 2017 (In thousands) Balance June 30, 2016 Charge-offs Recoveries Provision Balance June 30, 2017 Residential real estate $ 2,396 $ 90 $ - $ (17 ) $ 2,289 Residential construction and land 75 - - 14 89 Multi-family 22 - - 21 43 Commercial real estate 4,541 39 - 1,087 5,589 Commercial construction 502 - - 185 687 Home equity 309 - - (75 ) 234 Consumer installment 228 270 88 185 231 Commercial loans 1,412 66 3 331 1,680 Unallocated - - - 180 180 Total $ 9,485 $ 465 $ 91 $ 1,911 $ 11,022 Allowance for Loan Losses Loans Receivable Ending Balance June 30, 2017 Impairment Analysis Ending Balance June 30, 2017 Impairment Analysis (In thousands) Individually Evaluated Collectively Evaluated Individually Evaluated Collectively Evaluated Residential real estate $ 278 $ 2,011 $ 1,455 $ 243,876 Residential construction and land - 89 - 7,160 Multi-family - 43 - 9,199 Commercial real estate 135 5,454 1,249 256,715 Commercial construction 23 664 176 28,254 Home equity - 234 186 20,890 Consumer installment - 231 - 4,790 Commercial loans - 1,680 186 60,195 Unallocated - 180 - - Total $ 436 $ 10,586 $ 3,252 $ 631,079 Activity for the year ended June 30, 2016 (In thousands) Balance June 30, 2015 Charge-offs Recoveries Provision Balance June 30, 2016 Residential real estate $ 2,454 $ - $ - $ (58 ) $ 2,396 Residential construction and land 50 - - 25 75 Multi-family 40 - - (18 ) 22 Commercial real estate 3,699 162 17 987 4,541 Commercial construction 233 - - 269 502 Home equity 314 - - (5 ) 309 Consumer installment 223 245 78 172 228 Commercial loans 1,129 20 2 301 1,412 Total $ 8,142 $ 427 $ 97 $ 1,673 $ 9,485 Allowance for Loan Losses Loans Receivable Ending Balance June 30, 2016 Impairment Analysis Ending Balance June 30, 2016 Impairment Analysis (In thousands) Individually Evaluated Collectively Evaluated Individually Evaluated Collectively Evaluated Residential real estate $ 267 $ 2,129 $ 1,723 $ 233,269 Residential construction and land - 75 - 5,575 Multi-family - 22 - 3,918 Commercial real estate 61 4,480 1,429 191,249 Commercial construction - 502 - 20,159 Home equity - 309 5 20,888 Consumer installment - 228 - 4,350 Commercial loans 2 1,410 85 48,640 Total $ 330 $ 9,155 $ 3,242 $ 528,048 Foreclosed real estate (FRE) FRE consists of properties acquired through mortgage loan foreclosure proceedings or in full or partial satisfaction of loans. The following table sets forth information regarding FRE as of June 30, 2017 and 2016: (in thousands) 2017 2016 Residential real estate $ - $ 61 Land - 65 Commercial real estate 799 244 Total foreclosed real estate $ 799 $ 370

Premises and Equipment

Premises and Equipment	12 Months Ended
	Jun. 30, 2017
Premises and Equipment [Abstract]
Premises and Equipment	Note 5. Premises and Equipment A summary of premises and equipment at June 30, 2017 and 2016, is as follows: (In thousands) 2017 2016 Land $ 2,883 $ 2,883 Building and improvements 15,822 15,792 Furniture and equipment 4,280 4,233 Less: accumulated depreciation (9,370 ) (8,732 ) Total premises and equipment $ 13,615 $ 14,176

Deposits

Deposits	12 Months Ended
	Jun. 30, 2017
Deposits [Abstract]
Deposits	Note 6. Deposits Major classifications of deposits at June 30, 2017 and 2016 are summarized as follows: (In thousands) 2017 2016 Noninterest-bearing deposits $ 95,929 $ 88,254 Certificates of deposit 53,742 50,666 Savings deposits 197,288 177,309 Money market deposits 119,806 112,905 NOW deposits 392,770 309,753 Total deposits $ 859,535 $ 738,887 Advance payments by borrowers for taxes and insurance totaling $7,172,000 and $6,590,000 at June 30, 2017 and 2016, respectively, are included in savings deposits. Related party deposits are not material. The following indicates the amount of certificates of deposit by time remaining to maturity as of June 30, 2017. (In thousands) 3 months 3 to 6 7 to 12 Over 12 Total Certificates of deposit less than $100,000 $ 20,468 $ 4,618 $ 4,326 $ 11,499 $ 40,911 Certificates of deposit $100,000 or more 2,784 1,368 1,181 7,498 12,831 Total certificates of deposit $ 23,252 $ 5,986 $ 5,507 $ 18,997 $ 53,742 The aggregate amount of certificates of deposit in denominations of $250,000 or more (the amount which exceeds the FDIC insurance limit) was $2,121,000 and $2,824,000 at June 30, 2017 and 2016, respectively. Certificates of deposit less than $100,000 due within 3 months or less, includes $15.0 million in brokered deposits. Scheduled maturities of certificates of deposit at June 30, 2017 were as follows: (In thousands) The year ended June 30, 2018 $ 34,745 2019 7,940 2020 7,436 2021 2,349 2022 1,272 $ 53,742

Borrowings

Borrowings	12 Months Ended
	Jun. 30, 2017
Borrowings [Abstract]
Borrowings	Note 7. Borrowings At June 30, 2017, The Bank of Greene County had pledged approximately $256.1 million of its residential and commercial mortgage portfolios as collateral for borrowing and stand-by letters of credit at the Federal Home Loan Bank of New York (“FHLB”). The maximum amount of funding available from the FHLB was $206.4 million at June 30, 2017, of which $29.6 million in borrowings were outstanding at June 30, 2017. There were $6.9 million of short term or overnight borrowings outstanding at June 30, 2017 which carried an interest rate of 1.28%. Interest rates on short term borrowings are determined at the time of borrowing. Long-term fixed rate, fixed term advances totaled $22.7 million with a weighted average rate of 1.60% and a weighted average maturity of 28 months. The Bank has recently increased its level of long-term borrowing to strengthen its overall interest rate risk position, to help mitigate the potential negative impact of rising interest rates. The Bank of Greene County has established an Irrevocable Letter of Credit Reimbursement Agreement with the FHLB, whereby upon The Bank of Greene County’s request, on behalf of Greene County Commercial Bank, an irrevocable stand-by letter of credit is issued to secure municipal transactional deposit accounts. At June 30, 2017 and 2016, there were no outstanding letters of credit. The Bank of Greene County also pledges securities as collateral at the Federal Reserve Bank discount window for overnight borrowings. At June 30, 2017, approximately $2.8 million of collateral was available to be pledged against potential borrowings at the Federal Reserve Bank discount window. There were no balances outstanding with the Federal Reserve Bank at June 30, 2017 or 2016. The Bank of Greene County has established unsecured lines of credit with Atlantic Central Bankers Bank and another financial institution for $6.0 million and $5.0 million, respectively. Greene County Bancorp, Inc. has also established an unsecured line of credit with Atlantic Central Bankers Bank for $5.0 million. The lines of credit provide for overnight borrowing and the interest rate is determined at the time of the borrowing. At June 30, 2017 and 2016, there were no balances outstanding on any of these lines of credit. Scheduled maturities of long-term borrowings at June 30, 2017 were as follows: (In thousands) Within the year ended June 30, 2018 $ 4,500 2019 5,500 2020 6,000 2021 1,800 2022 4,850 $ 22,650

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	Note 8. Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss as of June 30, 2017 and 2016, respectively, are presented in the following table: (In thousands) 2017 2016 Unrealized gains on available-for-sale securities, net of tax $ 612 $ 1,224 Unrealized loss on securities transferred to held-to-maturity, net of tax - (2 ) Net losses and past service liability for defined benefit plan, net of tax (1,604 ) (1,947 ) Accumulated other comprehensive loss $ (992 ) $ (725 )

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Jun. 30, 2017
Employee Benefit Plans [Abstract]
Employee Benefit Plans	Note 9. Employee Benefit Plans Defined Benefit Plan The Bank of Greene County maintains a single-employer defined benefit pension plan (the “Pension Plan”). Effective January 1, 2006, the Board of Directors of the Bank resolved to exclude from membership in the Pension Plan employees hired on or after January 1, 2006 and elected to cease additional benefit accruals to existing Pension Plan participants effective July 1, 2006. Substantially all Bank employees who were hired before January 1, 2006 and attained the age of 21 are covered by the Pension Plan. Under the Pension Plan, retirement benefits are primarily a function of both years of service and level of compensation, at July 1, 2006. This defined benefit pension plan is accounted for in accordance with FASB ASC Topic 715 guidance on “ Compensation – Retirement Benefits, Defined Benefit Plans – Pension”, Information regarding the single-employer defined benefit pension plan at June 30, 2017 and 2016 is as follows: (In thousands) Change in projected benefit obligation: 2017 2016 Benefit obligation at beginning of year $ 6,171 $ 5,457 Interest cost 215 232 Actuarial (gain) loss (298 ) 695 Benefits paid (221 ) (213 ) Benefit obligation at June 30 5,867 6,171 Change in fair value of plan assets: Fair value of plan assets at beginning of year 4,391 4,481 Actual return on plan assets 312 123 Employer contributions 576 - Benefits paid (221 ) (213 ) Fair value of plan assets at June 30 5,058 4,391 Underfunded status at June 30 included in other liabilities $ 809 $ 1,780 The Company does not anticipate that it will make any contributions during the year ended June 30, 2018. The components of net periodic pension costs related to the defined benefit pension plan for the years ended June 30, 2017 and 2016 were as follows: (In thousands) 2017 2016 Interest cost $ 215 $ 232 Expected return on plan assets (231 ) (307 ) Amortization of net loss 197 135 Net periodic pension cost $ 181 $ 60 The accumulated benefit obligation for the pension plan was $5.9 million and $6.2 million at June 30, 2017 and 2016, respectively. Changes in plan assets and benefit obligations recognized in other comprehensive loss during the years ended June 30, 2017 and 2016 consisted of the following: (In thousands) 2017 2016 Actuarial gain (loss) on plan assets and benefit obligations $ 576 $ (744 ) Deferred tax (expense) benefit ( 233 ) 288 Net change in plan assets and benefit obligations recognized in other comprehensive income $ 343 $ (456 ) Amounts recognized in our consolidated statements of financial condition related to our pension plan for the years ended June 30, 2017 and 2016 are as follows: (In thousands) Other liabilities: 2017 2016 Projected benefit obligation in excess of fair value of pension plan $ 809 $ 1,780 Accumulated other comprehensive loss, net of taxes: Net losses and past service liability $ (1,604 ) $ (1,947 ) The principal actuarial assumptions used were as follows: Projected benefit obligation: 2017 2016 Discount rate 3.81 % 3.55 % Net periodic pension expense: Amortization period, in years 12 13 Discount rate 3.55 % 4.32 % Expected long-term rate of return on plan assets 5.00 % 7.00 % The discount rate used in the measurement of the Company’s pension obligation is based on the Citigroup Pension Liability Index based on expected benefit payments of the plan. The discount rates are evaluated at each measurement date to give effect to changes in the general interest rates. The expected long-term rate of return on plan assets reflects the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected benefit obligation. The selected rate considers the historical and expected future investment trends of the present and expected assets in the plan. Since this is a frozen plan, the compensation rate is zero percent. The weighted average asset allocation and fair value of our funded pension plan at June 30, 2017 and 2016 was as follows: (Dollars in thousands) 2017 2016 Money market accounts $ - - % $ 16 0.4 % Mutual funds 5,058 100.0 4,375 99.6 Total plan assets $ 5,058 100.0 % $ 4,391 100.0 % The fair value of assets within the pension plan was determined utilizing a quoted price in active markets at the measurement date. As such, these assets are classified as Level 1 within the “Fair Value Measurement” hierarchy. The target allocation for investment in mutual funds is 80% consisting of short-term and intermediate-term fixed income bond funds and 20% large cap value funds. This allocation is consistent with our goal of preserving capital while achieving investment results that will contribute to the proper funding of pension obligations and cash flow requirements. Asset rebalancing is performed on a quarterly basis, with adjustments made when the investment mix varies by more than 5% from the target. The amortization of accumulated other comprehensive income associated with the single employer defined benefit pension plan for the year ended June 30, 2018 is expected to be $168,000. Expected benefit payments under the pension plan over the next ten years at June 30, 2017 are as follows: (In thousands) 2018 $ 225 2019 223 2020 223 2021 222 2022 227 2023-2027 1,209 Defined Contribution Plan The Bank of Greene County also participates in a defined contribution plan (the “Contribution Plan”) covering substantially all employees who have completed three months of service. The plan includes Section 401(k) and thrift provisions as defined under the Internal Revenue Code. The provisions permit employees to contribute up to 50% of their total compensation on a pre-tax basis. The Bank of Greene County matches employee contributions dollar for dollar for the first 3% and then 50% of the employee contributions up to the next 3%. Company contributions associated with the contribution plan amounted to $255,000 and $246,000 in the years ended June 30, 2017 and 2016, respectively. Employee Stock Ownership Plan (“ESOP”) All Bank employees meeting certain age and service requirements are eligible to participate in the ESOP. Participant’s benefits become fully vested after three years of service. During the years ended June 30, 2017 and 2016, the Board of Directors authorized the payment of $110,000 and $100,000 respectively, to the ESOP trustee for the purposes of purchasing additional shares of stock to be allocated to employees as of December 2017 and 2016, respectively. ESOP expense was $113,000 and $84,000 for the years ended June 30, 2017 and 2016, respectively. There were no unearned shares at June 30, 2017 or 2016. Supplemental Executive Retirement Plan On June 21, 2010, the Board of Directors of The Bank of Greene County adopted The Bank of Greene County Supplemental Executive Retirement Plan (the “SERP Plan”), effective as of July 1, 2010. The SERP Plan benefits certain key senior executives of the Bank who are selected by the Board to participate. The SERP Plan is intended to provide a benefit from the Bank upon retirement, death or disability or voluntary or involuntary termination of service (other than “for cause”). Accordingly, the SERP Plan obligates the Bank to make an allocation to each executive’s account on the first business day of each July and permits each executive to defer up to 50% of his or her base salary and 100% of his or her annual bonus to the SERP Plan, subject to the requirements of Section 409A of the Internal Revenue Code (“Code”). In addition, the Bank may, but is not required to, make additional discretionary contributions to the executives’ accounts from time to time. An executive becomes vested in the Bank’s contributions after 10 calendar years of service following the effective date of the SERP Plan, and is fully vested immediately for all deferral of salary and bonus. However, the Executive will vest in the present value of his or her account in the event of death, disability or a change in control of the Bank or the Company. In the event the executive is terminated involuntarily or resigns for good reason following a change in control, the present value of all remaining Bank contributions is accelerated and paid to the executive’s account, subject to potential reduction to avoid an excess parachute payment under Code Section 280G. In the event of the executive’s death, disability or termination within two years after a change in control, executive’s account will be paid in a lump sum to the executive or his beneficiary, as applicable. In the event the executive is entitled to a benefit from the SERP Plan due to retirement or other termination of employment, the benefit will be paid in 10 annual installments. The net periodic pension costs related to the SERP for the years ended June 30, 2017 and 2016 were $509,000, and $398,000, respectively, consisting primarily of service and interest costs. The total liability for the SERP was $2.9 million and $2.0 million as of June 30, 2017 and June 30, 2016, respectively, and is included in accrued expenses and other liabilities.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Jun. 30, 2017
Stock-Based Compensation [Abstract]
Stock-Based Compensation	Note 10. Stock-Based Compensation At June 30, 2017, Greene County Bancorp, Inc. had two stock-based compensation plans, which are described below. Stock Option Plan Greene County Bancorp, Inc. has a stock-based compensation plan (the “2008 Option Plan”) which allows the Company to issue up to 360,000 options and stock appreciation rights. In 2008, the Board of Directors granted 329,000 options and stock appreciation rights (in tandem) to buy stock under the 2008 Option Plan at an exercise price of $6.25, the fair value of the stock on that date. These options have a 10-year term and vested over a three year period upon meeting specific earnings performance goals. A summary of the Company’s stock option activity and related information for its option plans for the years ended June 30, 2017 and 2016 is as follows: 2017 2016 Options Weighted Average Exercise Price Per Share Options Weighted Average Exercise Price Per Share Outstanding at beginning of year 64,770 $ 6.25 95,670 $ 6.25 Exercised (27,000 ) $ 6.25 (30,900 ) $ 6.25 Outstanding at year end 37,770 $ 6.25 64,770 $ 6.25 Exercisable at year end 37,770 $ 6.25 64,770 $ 6.25 The intrinsic value of options both outstanding and exercisable was $791,000 at June 30, 2017 and $649,000 at June 30, 2016. The following table presents stock options outstanding and exercisable at June 30, 2017: Options Outstanding and Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Life Weighted Average Exercise Price $ 6.25 37,770 1.25 $ 6.25 At June 30, 2017 and 2016, all outstanding options were fully vested, with no remaining compensation cost to be recognized. There were no stock options granted during the years ended June 30, 2017 or 2016. The total intrinsic value of the options exercised during the year ended June 30, 2017 was approximately $339,000. The total intrinsic value of the options exercised during the year ended June 30, 2016 was approximately $339,000 Phantom Stock Option Plan and Long-term Incentive Plan The Greene County Bancorp, Inc. 2011 Phantom Stock Option and Long-term Incentive Plan (the “Plan”) was adopted effective July 1, 2011, to promote the long-term financial success of the Company and its subsidiaries by providing a means to attract, retain and reward individuals who contribute to such success and to further align their interests with those of the Company’s shareholders. At June 30, 2017 and 2016, the Plan had 3,600,000 options authorized, of which, 2,972,982 and 2,394,782 options had been granted to date, respectively. The Plan is intended to provide benefits to employees and directors of the Company or any subsidiary as designated by the Compensation Committee of the Board of Directors of the Company (“Committee”). A phantom stock option represents the right to receive a cash payment on the date the award vests. The participant receives an amount equal to the positive difference between the strike price on the grant date and the book value of a share of the Company stock on the determination date, which is the last day of the plan year that is the end of the third plan year after the grant date of the award, unless otherwise specified by the Committee. The strike price will be the price established by the Committee, which will not be less than 100% of the book value of a share on a specified date, as determined under generally accepted accounting principles (GAAP) as of the last day of the quarter ending on or immediately preceding the valuation date with adjustments made, in the sole discretion of the Committee, to exclude accumulated other comprehensive income (loss). The liability for the phantom stock option plan is re-measured at each reporting period based on the difference between the strike price and the current period end book value per share of the Company’s common stock, excluding accumulated other comprehensive income (loss). A summary of the Company’s phantom stock option activity and related information for its option plan for the years ended June 30, 2017 and 2016 is as follows: 2017 2016 Number of options outstanding at beginning of year 1,352,554 1,257,508 Options granted 578,200 493,760 Options forfeited - (2,000 ) Options paid in cash upon vesting (408,034 ) (396,714 ) Number of options outstanding at period end 1,522,720 1,352,554 (In thousands) 2017 2016 Cash paid out on options vested $ 845 $ 711 Compensation expense recognized 1,448 1,013 The total liability for the long-term incentive plan was $2.0 million and $1.4 million at June 30, 2017 and 2016, respectively, and is included in accrued expenses and other liabilities.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Note 11. Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in a manner similar to that of basic earnings per share except that the weighted-average number of common shares outstanding is increased to include the number of incremental common shares that would have been outstanding under the treasury stock method if all potentially dilutive common shares (such as stock options) issued became vested during the period. There were no anti-dilutive securities or contracts outstanding during the years ended June 30, 2017 and 2016. 2017 2016 Net Income $ 11,187,000 $ 8,963,000 Weighted Average Shares – Basic 8,495,022 8,459,327 Effect of Dilutive Stock Options 18,107 16,965 Weighted Average Shares - Dilute 8,513,129 8,476,292 Earnings per share - Basic $ 1.32 $ 1.06 Earnings per share - Diluted $ 1.31 $ 1.06

Income Taxes

Income Taxes	12 Months Ended
	Jun. 30, 2017
Income Taxes [Abstract]
Income Taxes	Note 12. Income Taxes The provision for income taxes consists of the following for the years ended June 30, 2017 and 2016: (In thousands) 2017 2016 Current expense: Federal $ 3,591 $ 3,137 State 409 256 Total current expense 4,000 3,393 Deferred benefit (259 ) (714 ) Total provision for income taxes $ 3,741 $ 2,679 The effective tax rate differs from the federal statutory rate as follows for the years ended June 30, 2017 and 2016: 2017 2016 Tax based on federal statutory rate 34.00 % 34.00 % State income taxes, net of federal benefit 0.89 0.75 Tax-exempt income (8.20 ) (9.05 ) Captive insurance premium income (2.28 ) (2.95 ) Other, net 0.55 0.26 Total income tax expense 24.96 % 23.01 % The components of the deferred tax assets and liabilities at June 30 were as follows: (In thousands) 2017 2016 Deferred tax assets: Allowance for loan losses $ 4,220 $ 3,669 Pension benefits 310 689 Other benefit plans 1,957 1,137 Total deferred tax assets 6,487 5,495 Deferred tax liabilities: Depreciation 1,392 1,346 Loan costs 1,051 894 Real estate investment trust income 3,052 2,283 Unrealized gains on securities 379 771 Other 224 225 Total deferred tax liabilities 6,098 5,519 Net deferred tax asset (liability) included in prepaid expenses and other assets (other liabilities) $ 389 $ (24 ) 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 the taxable income or excess of deductions over revenues. The Company determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities and enacted changes in tax rates and laws are recognized in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of the evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized. The Company accounts for uncertain tax positions if it is more likely than not, based on technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management’s judgments. The Company recognizes interest and penalties on income taxes, if any, as a component of the provision for income taxes. As of June 30, 2017 and 2016, the Company did not have any uncertain tax positions. The Company does not expect to have any changes in unrecognized tax benefits as a result of settlements with taxing authorities during the next twelve months. As of June 30, 2017, tax years ended June 30, 2014

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Jun. 30, 2017
Commitments and Contingent Liabilities [Abstract]
Commitments and Contingent Liabilities	Note 13. Commitments and Contingent Liabilities In the normal course of business there are various commitments and contingent liabilities outstanding pertaining to the granting of loans and the lines of credit, which are not reflected in the accompanying consolidated financial statements. The Bank of Greene County’s unfunded loan commitments and unused lines of credit are as follows at June 30, 2017 and 2016: (In thousands) 2017 2016 Unfunded loan commitments $ 41,082 $ 41,383 Unused lines of credit 51,440 30,636 Total commitments $ 92,522 $ 72,019 Commitments to extend credit in the form of loan commitments and lines of credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being fully drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank of Greene County evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral, if any, required upon an extension of credit is based on management’s evaluation of customer credit. Commitments to extend mortgage credit are primarily collateralized by first liens on real estate. Collateral on extensions of commercial lines of credit vary but may include accounts receivable, inventory, property, plant and equipment, and income producing commercial property.

Operating Leases

Operating Leases	12 Months Ended
	Jun. 30, 2017
Operating Leases [Abstract]
Operating Leases	Note 14. Operating Leases The Bank of Greene County has non-cancelable lease commitments for four branch locations. These leases include obligations for real estate taxes, insurance and maintenance expenses. Total lease expense was $156,000 and $152,000 for the years ended June 30, 2017 and 2016, respectively. Minimum non-cancelable lease commitments for future years ending June 30 are as follows: (In thousands) The year ended June 30, Annual Lease Payments 2018 $ 159 2019 100 2020 81 2021 73 2022 30 Thereafter 0

Concentrations of Credit Risk

Concentrations of Credit Risk	12 Months Ended
	Jun. 30, 2017
Concentrations of Credit Risk [Abstract]
Concentrations of Credit Risk	Note 15. Concentrations of Credit Risk The Bank of Greene County grants residential, consumer and commercial loans to customers primarily located in the mid-Hudson valley region of New York, including Greene County. Over the last several years the Company has emphasized expansion into new markets in southern Albany and Columbia counties. In fiscal 2015, it expanded its lending area south into Ulster County. Although The Bank of Greene County has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent upon employment and other economic factors throughout Greene and its contiguous counties.

Fair Value Measurements and Fai

Fair Value Measurements and Fair Value of Financial Instruments	12 Months Ended
	Jun. 30, 2017
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value Measurements and Fair Value of Financial Instruments	Note 16. Fair Value Measurements and Fair Value of Financial Instruments Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent weaknesses in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates herein are not necessarily indicative of the amounts the Company could have realized in a sale transaction on the dates indicated. The estimated fair value amounts have been measured as of June 30, 2017 and 2016 and have not been re-evaluated or updated for purposes of these consolidated financial statements subsequent to those respective dates. As such, the estimated fair values of these financial instruments subsequent to the respective reporting dates may be different than the amounts reported at each period-end. The following information should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only provided for a limited portion of the Company’s assets and liabilities. Due to a wide range of valuation techniques and the degree of subjectivity used in making the estimates, comparisons between the Company’s disclosures and those of other companies may not be meaningful. The FASB ASC Topic on “ Fair Value Measurement” Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 2: Quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability. Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity). 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. For assets measured at fair value on a recurring basis, the fair value measurements by level within the fair value hierarchy used are as follows: Fair Value Measurements Using (In thousands) June 30, 2017 Quoted Prices For Identical Assets (Level 1) Significant Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: U.S. Government sponsored enterprises $ 4,717 $ - $ 4,717 $ - State and political subdivisions 58,112 - 58,112 - Mortgage-backed securities-residential 4,913 - 4,913 - Mortgage-backed securities-multi-family 20,765 - 20,765 - Asset-backed securities 1 1 - - Corporate debt securities 2,791 2,791 - - Equity securities 184 184 - - Securities available-for-sale $ 91,483 $ 2,976 $ 88,507 $ - Fair Value Measurements Using (In thousands) June 30, 2016 Quoted Prices For Identical Assets (Level 1) Significant Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: U.S. Government sponsored enterprises $ 4,891 $ - $ 4,891 $ - State and political subdivisions 60,499 - 60,499 - Mortgage-backed securities-residential 6,540 - 6,540 - Mortgage-backed securities-multi-family 23,879 - 23,879 - Asset-backed securities 5 5 - - Corporate debt securities 4,157 4,157 - - Equity securities 152 152 - - Securities available-for-sale $ 100,123 $ 4,314 $ 95,809 $ - Certain investments that are actively traded and have quoted market prices have been classified as Level 1 valuations. Other available-for-sale investment securities have been valued by reference to prices for similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. In addition to disclosures of the fair value of assets on a recurring basis, FASB ASC Topic on “ Fair Value Measurement” Receivables – Loan Impairment” Fair Value Measurements Using (In thousands) Recorded Investment Related Allowance Fair Value (Level 1) (Level 2) (Level 3) June 30, 2017 Impaired loans $ 1,175 $ 330 $ 845 $ - $ - $ 845 Foreclosed real estate 799 - 799 - - 799 June 30, 2016 Impaired loans $ 655 $ 164 $ 491 $ - $ - $ 491 Foreclosed real estate 370 - 370 - - 370 The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which Level 3 inputs were utilized to determine fair value: (Dollars in thousands) Fair Value Valuation Technique Unobservable Input Range Weighted Average June 30, 2017 Impaired loans $ 845 Appraisal of collateral (1) Appraisal adjustments (2) 25.00%-42.52 % 28.46 % Liquidation expenses (3) 3.45%-7.38 % 5.93 % Foreclosed real estate 799 Appraisal of collateral (1) Appraisal adjustments (2) 0.00-0.00 % 0.00 % Liquidation expenses (3) 11.64%-17.92 % 16.29 % June 30, 2016 Impaired loans $ 491 Appraisal of collateral (1) Appraisal adjustments (2) 0.00%-38.85 % 21.01 % Liquidation expenses (3) 0.00%-8.35 % 4.92 % Foreclosed real estate 370 Appraisal of collateral (1) Appraisal adjustments (2) 0.00-54.17 % 8.83 % Liquidation expenses (3) 0.42%-12.67 % 7.81 % (1) Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable. (2) Appraisals may be adjusted downwards by management for qualitative factors such as economic conditions. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received or age of the appraisal. (3) Appraisals may be adjusted downwards by management for items such as the estimated costs to liquidate the collateral. No other financial assets or liabilities were re-measured during the year on a nonrecurring basis. The carrying amounts reported in the statements of financial condition for cash and cash equivalents, long term certificate of deposits, accrued interest receivable and accrued interest payable approximate their fair values. Fair values of securities are based on quoted market prices (Level 1), where available, or matrix pricing (Level 2), which is a mathematical technique, used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted prices. The carrying amount of Federal Home Loan Bank stock approximates fair value due to its restricted nature. Fair values for variable rate loans that reprice frequently, with no significant credit risk, are based on carrying value. Fair value for fixed rate loans are estimated using discounted cash flows and interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Fair values disclosed for demand and savings deposits are equal to carrying amounts at the reporting date. The carrying amounts for variable rate money market deposits approximate fair values at the reporting date. Fair values for fixed rate certificates of deposit are estimated using discounted cash flows and interest rates currently being offered in the market on similar certificates. Fair value for Federal Home Loan Bank long term borrowings are estimated using discounted cash flows and interest rates currently being offered on similar borrowings. The carrying value of short-term Federal Home Loan Bank borrowings approximates its fair value. The fair value of commitments to extend credit is estimated based on an analysis of the interest rates and fees currently charged to enter into similar transactions, considering the remaining terms of the commitments and the credit-worthiness of the potential borrowers. At June 30, 2017 and 2016, the estimated fair values of these off-balance sheet financial instruments were immaterial, and are therefore excluded from the table below. The carrying amounts and estimated fair value of financial instruments are as follows: (In thousands) June 30, 2017 Fair Value Measurements Using Carrying Amount Fair Value (Level 1) (Level 2) (Level 3) Cash and cash equivalents $ 16,277 $ 16,277 $ 16,277 $ - $ - Long term certificate of deposit 2,145 2,145 2,145 - - Securities available-for-sale 91,483 91,483 2,976 88,507 - Securities held-to-maturity 223,830 228,452 - 228,452 - Federal Home Loan Bank stock 2,131 2,131 - 2,131 - Net loans receivable 624,187 629,690 - - 629,690 Accrued interest receivable 4,033 4,033 - 4,033 - Deposits 859,535 859,715 - 859,715 - Borrowings from Federal Home Loan Bank 29,550 29,411 - 29,411 - Accrued interest payable 92 92 - 92 - (In thousands) June 30, 2016 Fair Value Measurements Using Carrying Amount Fair Value (Level 1) (Level 2) (Level 3) Cash and cash equivalents $ 15,895 $ 15,895 $ 15,895 $ - $ - Long term certificate of deposit 2,210 2,210 2,210 - - Securities available-for-sale 100,123 100,123 4,314 95,809 - Securities held-to-maturity 204,935 214,058 - 214,058 - Federal Home Loan Bank stock 2,752 2,752 - 2,752 - Net loans receivable 522,764 533,721 - - 533,721 Accrued interest receivable 3,610 3,610 - 3,610 - Deposits 738,887 739,087 - 739,087 - Borrowings from Federal Home Loan Bank 46,400 46,562 - 46,562 - Accrued interest payable 74 74 - 74 -

Regulatory Matters

Regulatory Matters	12 Months Ended
	Jun. 30, 2017
Regulatory Matters [Abstract]
Regulatory Matters	Note 17. Regulatory Matters The Bank of Greene County and its wholly-owned subsidiary, Greene County Commercial Bank, are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material impact on the Company’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank and the Commercial Bank must meet specific guidelines that involve quantitative measures of assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. As of June 30, 2017, the most recent notification from regulators categorized the banks as “well capitalized” under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s category. Quantitative measures established by regulation to ensure capital adequacy require The Bank of Greene County and Greene County Commercial Bank to maintain minimum amounts and ratios (set forth in the table below). In July 2013, the Office of the Comptroller of the Currency and the other federal bank regulatory agencies issued a final rule that will revise their leverage and risk-based capital requirements and the method for calculating risk-weighted assets to make them consistent with agreements that were reached by the Basel Committee on Banking Supervision and certain provisions of the Dodd-Frank Act. Among other things, the rule establishes a new common equity Tier 1 minimum capital requirement (4.5% of risk-weighted assets), increases the minimum Tier 1 capital to risk-based assets requirement (from 4% to 6% of risk-weighted assets) and assigns a higher risk weight (150%) to exposures that are more than 90 days past due or are on nonaccrual status and to certain commercial real estate facilities that finance the acquisition, development or construction of real property. The final rule also requires unrealized gains and losses on certain “available-for-sale” securities holdings to be included for purposes of calculating regulatory capital unless a one-time opt-out is exercised. Additional constraints will also be imposed on the inclusion in regulatory capital of mortgage-servicing assets, defined tax assets and minority interests. The rule limits a banking organization’s capital distributions and certain discretionary bonus payments if the banking organization does not hold a “capital conservation buffer” consisting of 2.5% of common equity Tier 1 capital to risk-weighted assets in addition to the amount necessary to meet its minimum risk-based capital requirements. The final rule became effective for The Bank of Greene County and Greene County Commercial Bank on January 1, 2015. The capital conservation buffer requirement will be phased in, increasing incrementally by 0.625% each year, beginning January 1, 2016 and ending January 1, 2019, when the full capital conservation buffer requirement will be effective. Management believes that, as of June 30, 2017, The Bank of Greene County and Greene County Commercial Bank met all capital adequacy requirements to which they are subject. (Dollars in thousands) Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Capital Conservation Buffer The Bank of Greene County Amount Ratio Amount Ratio Amount Ratio Actual Required As of June 30, 2017: Total risk-based capital $ 87,719 15.8 % $ 44,433 8.0 % $ 55,542 10.0 % 7.794 % 1.250 % Tier 1 risk-based capital 80,671 14.5 33,325 6.0 44,433 8.0 8.525 1.250 Common equity tier 1 capital 80,671 14.5 24.994 4.5 36,102 6.5 10.024 1.250 Tier 1 leverage ratio 80,671 8.5 38,056 4.0 47,571 5.0 4.479 1.250 As of June 30, 2016: Total risk-based capital $ 76,666 16.3 % $ 37,577 8.0 % $ 46,972 10.0 % 8.322 % 0.625 % Tier 1 risk-based capital 70,709 15.1 28,183 6.0 37,577 8.0 9.054 0.625 Common equity tier 1 capital 70,709 15.1 21,137 4.5 30,532 6.5 10.554 0.625 Tier 1 leverage ratio 70,709 8.4 33,815 4.0 42,268 5.0 4.364 0.625 Greene County Commercial Bank As of June 30, 2017: Total risk-based capital $ 30,095 40.1 % $ 6,011 8.0 % $ 7,514 10.0 % 32.053 % 1.250 % Tier 1 risk-based capital 30,095 40.1 4,508 6.0 6,011 8.0 34.053 1.250 Common equity tier 1 capital 30,095 40.1 3,381 4.5 4,884 6.5 35.550 1.250 Tier 1 leverage ratio 30,095 9.62 12,508 4.0 15,635 5.0 5.624 1.250 As of June 30, 2016: Total risk-based capital $ 23,065 40.8 % $ 4,518 8.0 % $ 5,648 10.0 % 32.840 % 0.625 % Tier 1 risk-based capital 23,065 40.8 3,389 6.0 4,518 8.0 34.840 0.625 Common equity tier 1 capital 23,065 40.8 2,541 4.5 3,671 6.5 36.340 0.625 Tier 1 leverage ratio 23,065 8.1 11,409 4.0 14,262 5.0 4.086 0.625

Condensed Financial Statements

Condensed Financial Statements of Greene County Bancorp, Inc.	12 Months Ended
	Jun. 30, 2017
Condensed Financial Statements of Greene County Bancorp, Inc. [Abstract]
Condensed Financial Statements of Greene County Bancorp, Inc.	Note 18. Condensed Financial Statements of Greene County Bancorp, Inc. The following condensed financial statements summarize the financial position and the results of operations and cash flows of Greene County Bancorp, Inc. as of and for the years ended June 30, 2017 and 2016. Greene County Bancorp, Inc. Condensed Statements of Financial Condition As of June 30, 2017 and 2016 (In thousands) ASSETS 2017 2016 Cash and cash equivalents $ 2,015 $ 2,641 Investment in subsidiaries 81,540 71,723 Prepaid expenses and other assets 53 48 Total assets $ 83,608 $ 74,412 LIABILITIES AND SHAREHOLDERS’ EQUITY Total liabilities $ 87 $ 111 111 Total shareholders’ equity 83,521 74,301 Total liabilities and shareholders’ equity $ 83,608 $ 74,412 Greene County Bancorp, Inc. Condensed Statements of Income For the Years Ended June 30, 2017 and 2016 (In thousands) 2017 2016 INCOME: Equity in undistributed net income of subsidiaries $ 9,484 $ 5,239 Dividend distributed by subsidiary 1,904 4,004 Interest-earning deposits 6 6 Total Income 11,394 9,249 OPERATING EXPENSES: Legal fees 46 66 Other 161 220 Total operating expenses 207 286 Net income $ 11,187 $ 8,963 Greene County Bancorp, Inc. Condensed Statements of Comprehensive Income For the Years Ended June 30, 2017 and 2016 (In thousands) 2017 2016 Net income $ 11,187 $ 8,963 Other comprehensive income: Unrealized holding (losses) gains on available-for-sale securities, net of income tax (benefit) expense of ($392) and $328, respectively (612 ) 520 Accretion of unrealized loss on securities transferred to held-to-maturity, net of income taxes of $1 and $6, respectively 2 9 Pension actuarial gain (loss), net of income tax expense (benefit) of $158 and ($340) 221 (539 ) Amortization of pension actuarial losses recognized in salaries and benefits, net of income taxes of $75 and $52, respectively 122 83 Total other comprehensive (loss) income net of taxes (267 ) 73 Comprehensive income $ 10,920 $ 9,036 Greene County Bancorp, Inc. Condensed Statements of Cash Flows For the Years Ended June 30, 2017 and 2016 (In thousands) Cash flow from operating activities: 2017 2016 Net Income $ 11,187 $ 8,963 Adjustments to reconcile net income to cash provided by operating activities: Undistributed earnings of subsidiaries (9,484 ) (5,239 ) Tax benefit of stock based compensation (51 ) (6 ) Net increase in prepaid expenses and other assets (5 ) (27 ) Net increase in total liabilities 27 61 Net cash provided by operating activities 1,674 3,752 Cash flows from Investing Activities: Investment in subsidiary (600 ) - Net cash used by investing activities (600 ) - Cash flows from financing activities: Payment of cash dividends (1,920 ) (1,854 ) Proceeds from exercise of stock options 169 193 Excess tax benefit from share-based payment arrangements 51 6 Net cash used in financing activities (1,700 ) (1,655 ) Net (decrease) increase in cash and cash equivalents (626 ) 2,097 Cash and cash equivalents at beginning of year 2,6414 544 Cash and cash equivalents at end of year $ 2,015 $ 2,641

Subsequent Events

Subsequent Events	12 Months Ended
	Jun. 30, 2017
Subsequent events [Abstract]
Subsequent events	Note 19. Subsequent events On July 18, 2017, Greene County Bancorp, Inc. announced that its Board of Directors had approved a quarterly cash dividend of $0.0975 per share on the Company’s common stock. The dividend reflects an annual cash dividend rate of $0.39 per share which represents a 2.6% increase from the previous annual cash dividend rate of $0.38 per share. The dividend was payable to stockholders of record as of August 15, 2017, and was paid on August 31, 2017. The MHC waived its right to receive dividends declared on its shares of the Company’s common stock for the quarter ended June 30, 2017.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Greene County Bancorp, Inc. (the “Company”) and its subsidiaries, The Bank of Greene County (the “Bank”) and Greene Risk Management, Inc., and the Bank’s subsidiaries Greene County Commercial Bank and Greene Property Holdings, Ltd. All material inter-company accounts and transactions have been eliminated. Amounts in the prior year’s consolidated financial statements have been reclassified whenever necessary to conform to the current year’s presentation. These reclassifications had no effect on net income or shareholders’ equity as previously reported. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). These consolidated financial statements consider events that occurred through the date the consolidated financial statements were issued.
Nature of Operations	Nature of Operations Greene County Bancorp, Inc.’s primary business is the ownership and operation of its subsidiaries. The Bank of Greene County has 13 full-service offices and an operations center located in its market area consisting of the Hudson Valley of New York. The Bank of Greene County is primarily engaged in the business of attracting deposits from the general public in The Bank of Greene County’s market area, and investing such deposits, together with other sources of funds, in loans and investment securities. Greene County Commercial Bank’s primary business is to attract deposits from, and provide banking services to, local municipalities. Greene Property Holdings, Ltd. was formed as a New York corporation that has elected under the Internal Revenue Code to be a real estate investment trust. Currently, certain mortgages and loan notes held by The Bank of Greene County are transferred and beneficially owned by Greene Property Holdings, Ltd. The Bank of Greene County continues to service these loans. Greene Risk Management, Inc. was formed in December 2014 as a pooled captive insurance company subsidiary of Greene County Bancorp, Inc., incorporated in the State of Nevada. The purpose of this company is to provide additional insurance coverage for the Company and its subsidiaries related to the operations of the Company for which insurance may not be economically feasible.
Charter	Charter Greene County Bancorp, Inc. and its parent mutual holding company (the “MHC”) are federally chartered and regulated and examined by the Federal Reserve Board. The Bank of Greene County, the subsidiary of Greene County Bancorp, Inc., is also federally chartered and regulated and examined by the Office of the Comptroller of the Currency (the “OCC”). Greene County Commercial Bank is a New York State-chartered financial institution, regulated and examined by the New York State Banking Department. Greene Property Holdings, Ltd. is a New York corporation. As a federal savings association, The Bank of Greene County must satisfy the qualified thrift lender, or “QTL”, requirement by meeting one of two tests: the Home Owners’ Loan Act (“HOLA”) QTL test or the Internal Revenue Service (IRS) Domestic Building and Loan Association (DBLA) test. The federal savings association may use either test to qualify and may switch from one test to the other. Under the HOLA QTL test, The Bank of Greene County must maintain at least 65% of its “portfolio assets” in “qualified thrift investments” in at least nine of the most recent 12-month period. “Portfolio assets” generally means total assets of a savings institution, less the sum of specified liquid assets up to 20% of total assets, goodwill and other intangible assets, and the value of property used in the conduct of the savings association’s business. “Qualified thrift investments” include various types of loans made for residential and housing purposes, investments related to such purposes, including certain mortgage-backed and related securities, and loans for personal, family, household and certain other purposes up to a limit of 20% of portfolio assets. “Qualified thrift investments” also include 100% of an institution’s credit card loans, education loans and small business loans. The Bank of Greene County also may satisfy the QTL test by qualifying as a “domestic building and loan association” as defined in the Internal Revenue Code. Under the IRS DBLA test, the Bank must meet the business operations test and the 60% of assets test. The business operations test requires that the federal savings association’s business consists primarily of acquiring the savings of the public (75% of its deposits, withdrawable shares, and other obligations must be held by the general public) and investing in loans (more than 75% of its gross income consists of interest on loans and government obligations and various other specified types of operating income that federal savings associations ordinarily earn). For the 60% of assets test, the Bank must maintain at least 60% of its total in “qualified investments” as of the close of the taxable year or, at the option of the taxpayer, may be computed on the basis of the average assets outstanding during the taxable year. A savings association that fails the qualified thrift lender test must either convert to a bank charter or operate under specified restrictions. During the years ended June 30, 2017 and 2016, The Bank of Greene County opted to utilize the HOLA QTL test and satisfied the requirements of this test for the entire 12-month period.
Use of Estimates	Use of 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 materially differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses and the assessment of other-than-temporary security impairment. While management uses available information to recognize losses on loans, future additions to the allowance for loan losses (the “Allowance”) may be necessary, based on changes in economic conditions, asset quality or other factors. In addition, various regulatory authorities, as an integral part of their examination process, periodically review the Allowance. Such authorities may require the Company to recognize additions to the Allowance based on their judgments of information available to them at the time of their examination. Greene County Bancorp, Inc. makes an assessment to determine whether there have been any events or economic circumstances to indicate that a security on which there is an unrealized loss is impaired on an other-than-temporary basis. The Company considers many factors including the severity and duration of the impairment; the intent and ability of the Company to hold the security for a period of time sufficient for a recovery in value; recent events specific to the issuer or industry; and for debt securities, intent to sell the security, whether it is more likely than not we will be required to sell the security before recovery, whether loss is expected, external credit ratings and recent downgrades. Securities on which there is an unrealized loss that is deemed to be other-than-temporary are written down to fair value through earnings.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand, amounts due from banks, interest-bearing deposits at other financial institutions, investments (with original maturity of three months or less), and overnight federal funds sold. The amounts of interest-bearing deposits included as cash equivalents at June 30, 2017 and 2016 were $6.1 million and $6.0 million, respectively.
Securities	Securities Greene County Bancorp, Inc. has classified its investments in debt and equity securities as either available-for-sale or held-to-maturity. Available-for-sale securities are reported at fair value, with net unrealized gains and losses reflected in the accumulated other comprehensive income (loss) component of shareholders’ equity, net of applicable income taxes. Held-to-maturity securities are those debt securities which management has the intent the ability to hold to maturity and are reported at amortized cost. The Company does not have trading securities in its portfolio. Realized gains or losses on security transactions are reported in earnings and computed using the specific identification cost basis. Fair values of securities are based on quoted market prices, where available. Valuation of securities is further described in Note 16, Fair Value Measurements and Fair Value of Financial Instruments When the fair value of a held-to-maturity or available-for-sale security is less than its amortized cost basis, an assessment is made as to whether other-than-temporary impairment (“OTTI”) is present. The Company considers numerous factors when determining whether a potential OTTI exists and the period over which the debt security is expected to recover. The principal factors considered are (1) the length of time and the extent to which the fair value has been less than the amortized cost basis, (2) the financial condition of the issuer (and guarantor, if any) and adverse conditions specifically related to the security, industry or geographic area, (3) failure of the issuer of the security to make scheduled interest or principal payments, (4) any changes to the rating of the security by a rating agency, and (5) the presence of credit enhancements, if any, including the guarantee of the federal government or any of its agencies. For debt securities, OTTI is considered to have occurred if (1) the Company intends to sell the security before recovery of its amortized cost basis, (2) it is more likely than not the Company will be required to sell the security before recovery of its amortized cost basis, or (3) if the present value of expected cash flows is not sufficient to recover the entire amortized cost basis. In determining the present value of expected cash flows, the Company discounts the expected cash flows at the effective interest rate implicit in the security at the date of acquisition. In estimating cash flows expected to be collected, the Company uses available information with respect to security prepayment speeds, default rates and severity. In determining whether OTTI has occurred for equity securities, the Company considers the applicable factors described above and 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. For debt securities, credit-related OTTI is recognized in earnings while noncredit related OTTI on securities not expected to be sold is recognized in other comprehensive income/loss (“OCI”). Credit-related OTTI is measured as the difference between the present value of an impaired security’s expected cash flows and its amortized cost basis. Noncredit-related OTTI is measured as the difference between the fair value of the security and its amortized cost less any credit-related losses recognized. For securities classified as held-to-maturity, the amount of OTTI recognized in OCI is accreted to the credit-adjusted expected cash flow amounts of the securities over future periods. For equity securities, the entire amount of OTTI is recognized in earnings.
Loans	Loans Loans are stated at unpaid principal balances, less the allowance for loan losses and net deferred loan origination fees and costs. Interest on loans is accrued and credited to income based upon the principal amount outstanding. Unearned discount on installment loans is recognized as income over the term of the loan, principally using a method that approximates the effective yield method. Nonrefundable loan fees and related direct costs are deferred and amortized over the life of the loan as an adjustment to loan yield using the effective interest method.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is maintained by a provision for loan losses charged to expense, reduced by net charge-offs and increased by recoveries of loans previously charged off. The level of the allowance is based on management’s evaluation of the collectability of the loan portfolio, including the nature of the portfolio, credit concentrations, trends in historical loss experience, specific impaired loans, payment status of the loan and economic conditions. The Bank of Greene County considers smaller balance residential mortgages, home equity loans, commercial real estate, business loans and installment loans to customers as small, homogeneous loans, which are evaluated for impairment collectively based on historical loss experience. Larger balance residential, commercial real estate mortgage and business loans are reviewed individually and considered impaired if it is probable that The Bank of Greene County will not be able to collect scheduled payments of principal and interest when due, according to the contractual terms of the loan agreements. The measurement of impaired loans is generally based on the fair value of the underlying collateral, less estimated costs to sell. The majority of The Bank of Greene County loans, including most nonaccrual loans, are small homogenous loan types adequately supported by collateral. As a result, the level of impaired loans may only be a portion of nonaccrual loans. Loans that are delinquent or slow paying may not be impaired. Management considers the payment status of loans in the process of evaluating the adequacy of the allowance for loan losses among other factors. Based on this evaluation, a delinquent loan’s risk rating may be downgraded to either pass-watch, special mention, or substandard, and the allocation of the allowance for loan loss is based upon the risk associated with such designation.
Income Recognition on Impaired and Nonaccrual loans	Income Recognition on Impaired and Nonaccrual loans The Bank of Greene County generally places a loan, including impaired loans, on nonaccrual status when it is specifically determined to be impaired or when principal and interest is delinquent for 90 days or more. Any unpaid interest previously accrued on these loans is reversed from income. When a loan is specifically determined to be impaired, collection of interest and principal are generally applied as a reduction to principal outstanding until the collection of the remaining balance is reasonably assured. Interest income on all nonaccrual loans is recognized on a cash basis.
Foreclosed Real Estate (FRE)	Foreclosed Real Estate (FRE) FRE consists of properties acquired through mortgage loan foreclosure proceedings or in full or partial satisfaction of loans. FRE is initially recorded at fair value (less estimated costs to sell) at the date the collateral is acquired establishing a new cost basis and any shortfall is charged to the allowance for loan losses at this time. Subsequently, management reviews the value of FRE and write-downs, if any, are charged to expense. All expenses and income related to FRE are included in consolidated results of operations as part of noninterest expense.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using principally the straight-line method over the estimated useful lives of the related assets (39 years for building and improvements, 3-8 years for furniture and equipment). Maintenance and repairs are typically charged to expense when incurred. Gains and losses from sales or other dispositions of premises and equipment are included in consolidated results of operations. Leasehold improvements are amortized over the lesser of the related terms of the leases or their useful life.
Treasury Stock	Treasury Stock Common stock repurchases are recorded at cost and then held as treasury stock. From time to time, Greene County Bancorp, Inc. may repurchase shares of common stock under an approved plan if, in its judgment, such shares are an attractive investment, in view of the current price at which the common stock is trading relative to Greene County Bancorp, Inc.’s earnings per share, book value per share and general market and economic factors. The Company has a stock repurchase program which allows for the repurchase of up to 184,692 shares. As of June 30, 2017, 124,956 shares had been repurchased under this plan. The Company currently does not intend to repurchase any additional shares under this stock repurchase program. Common stock may also be acquired in order to have shares available for issuance under the Stock Option Plans. For more information regarding these plans see Note 10, Stock-Based Compensation
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock Federal law requires a member institution of the Federal Home Loan Bank (“FHLB”) system to hold stock of its district FHLB according to a predetermined formula. This stock is restricted in that it can only be sold to the FHLB or to another member institution, and all sales of FHLB stock must be at par. As a result of these restrictions, FHLB stock is carried at cost. FHLB stock is held as a long-term investment and its value is determined based on the ultimate recoverability of the par value. Impairment of this investment is evaluated quarterly and is a matter of judgment that reflects management’s view of the FHLB’s long-term performance, which includes factors such as the following: its operating performance; the severity and duration of declines in the fair value of its net assets related to its capital stock amount; its commitment to make payments required by law or regulation and the level of such payments in relation to its operating performance; the impact of legislative and regulatory changes on the FHLB, and accordingly, on the members of the FHLB; and its liquidity and funding position. After evaluating these considerations, Greene County Bancorp, Inc. concluded that the par value of its investment in FHLB stock will be recovered and, therefore, no other-than-temporary impairment charge was recorded during the years ended June 30, 2017 or 2016.
Advertising	Advertising Greene County Bancorp, Inc. follows a policy of charging the costs of advertising to expense as incurred. Advertising costs included in other operating expenses were $387,000 and $373,000 for the years ended June 30, 2017 and 2016, respectively.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Off-Balance Sheet Credit Related Financial Instruments	Off-Balance Sheet Credit Related Financial Instruments In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under lines of credit. Such financial instruments are recorded when they are funded.
Income Taxes	Income Taxes Provisions for income taxes are based on taxes currently payable or refundable and deferred income taxes on temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements. Deferred tax assets and liabilities are reported at currently enacted income tax rates applicable to the period in which the deferred tax assets and liabilities are expected to be realized or settled.
Earnings Per Share (EPS)	Earnings Per Share (EPS) Basic EPS is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is computed in a manner similar to that of basic earnings per share except that the weighted-average number of common shares outstanding is increased to include the number of incremental common shares that would have been outstanding under the treasury stock method if all potentially dilutive common shares (such as stock options) issued became vested during the period. Unallocated common shares held by the ESOP are not included in the weighted-average number of common shares outstanding for either the basic or diluted earnings per share calculations.
Impact of Recent Accounting Pronouncements	Impact of Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued an Accounting Standard Update (“ASU) (ASU 2014-09) to amend its guidance on “Revenue from Contracts with Customers (Topic 606). The objective of the ASU is to align the recognition of revenue with the transfer of promised goods or services provided to customers in an amount that reflects the consideration which the entity expects to be entitled in exchange for those goods or services. This ASU will replace most existing revenue recognition guidance under GAAP when it becomes effective. In August, 2015, the FASB issued an amendment (ASU 2015-14) which defers the effective date of this new guidance by one year. More detailed implementation guidance on Topic 606 was issued in March 2016 (ASU 2016-08), April 2016 (ASU 2016-10), May 2016 (ASU 2016-12), December 2016 (ASU 2016-20) and February 2017 (ASU 2017-05), and the effective date and transition requirements for these ASUs are the same as the effective date and transition requirements of ASU 2014-09. The amendments in ASU 2014-09 are effective for public business entities for annual periods, beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In August 2014, the FASB issued an amendment (ASU 2014-14) to its guidance on “Receivables – Troubled Debt Restructurings by Creditors (Subtopic 310-40)”. The objective of the ASU is to reduce the diversity in how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure, to provide more decision-useful information about a creditor’s foreclosed mortgage loans that are expected to be recovered, at least in part, through government guarantees. The amendments in this Update are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. Public entities would be permitted to elect to early adopt for annual reporting periods beginning after December 15, 2016. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In January 2015, the FASB issued an Update (ASU 2015-01) to its guidance on “Income Statement-Extraordinary and Unusual Items (Subtopic 225-20)”. The objective of the ASU is to simplify the income statement presentation by eliminating the concept of extraordinary items, and will align GAAP more closely with International Accounting Standards which prohibits the presentation and disclosure of extraordinary items. The amendments in this Update were effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The adoption of this guidance did not have a material impact on our consolidated results of operations or financial position. In January 2016, the FASB issued an Update (ASU 2016-01) to its guidance on “Financial Instruments (Subtopic 825-10)”. This amendment addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. These amendments require equity securities to be measured at fair value with changes in the fair value to be recognized through net income. The amendments also simplify the impairment assessment of equity investments without readily determinable fair values by requiring assessment for impairment qualitatively at each reporting period. For public business entities, the amendments in this Update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption of the amendments in this Update is not permitted. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In February 2016, the FASB issued an Update (ASU 2016-02) to its guidance on “Leases (Topic 842)”. The new leases standard applies a right-of-use (ROU) model that requires a lessee to record, for all leases with a lease term of more than 12 months, an asset representing its right to use the underlying asset and a liability to make lease payments. For leases with a term of 12 months or less, a practical expedient is available whereby a lessee may elect, by class of underlying asset, not to recognize an ROU asset or lease liability. The new leases standard requires a lessor to classify leases as either sales-type, direct financing or operating, similar to existing U.S. GAAP. Classification depends on the same five criteria used by lessees plus certain additional factors. The subsequent accounting treatment for all three lease types is substantially equivalent to existing U.S. GAAP for sales-type leases, direct financing leases, and operating leases. However, the new standard updates certain aspects of the lessor accounting model to align it with the new lessee accounting model, as well as with the new revenue standard under Topic 606. Lessees and lessors are required to provide certain qualitative and quantitative disclosures to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The amendments are effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The adoption of this ASU will result in a gross up of the Consolidated Statements of Financial Condition for right-of-use assets and associated lease liabilities for operating leases in which the Company is the lessee. The Company is evaluating the significance and other effects of adoption on the consolidated financial statements and related disclosures. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations. Branch building leases have been reviewed and are considered immaterial to the financial statements; there are no equipment leases to consider. In March 2016, the FASB issued an Update (ASU 2016-09) to its guidance on “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”. This amendment is intended to simplify the accounting for stock compensation. The areas for simplification in this Update involve several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public business entities, the amendments in this Update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted for any entity in any interim or annual period. The adoption of this guidance is not expected to have a material impact on our consolidated results of operations or financial position. In June 2016, the FASB issued an Update (ASU 2016-13) to its guidance on “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 requires credit losses on most financial assets measured at amortized cost and certain other instruments to be measured using an expected credit loss model (referred to as the current expected credit loss (CECL) model). Under this model, entities will estimate credit losses over the entire contractual term of the instrument (considering estimated prepayments, but not expected extensions or modifications unless reasonable expectation of a troubled debt restructuring exists) from the date of initial recognition of that instrument. The ASU also replaces the current accounting model for purchased credit impaired loans and debt securities. The allowance for credit losses for purchased financial assets with a more-than insignificant amount of credit deterioration since origination (“PCD assets”), should be determined in a similar manner to other financial assets measured on an amortized cost basis. However, upon initial recognition, the allowance for credit losses is added to the purchase price (“gross up approach”) to determine the initial amortized cost basis. The subsequent accounting for PCD financial assets is the same expected loss model described above. Further, the ASU made certain targeted amendments to the existing impairment model for available-for-sale (AFS) debt securities. For an AFS debt security for which there is neither the intent nor a more-likely-than-not requirement to sell, an entity will record credit losses as an allowance rather than a write-down of the amortized cost basis. For public business entities that are U.S. Securities and Exchange Commission (SEC) filers, the amendments in this Update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this Update earlier as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply the amendments in this Update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). The Company is currently evaluating the potential impact on our consolidated results of operations or financial position. The initial adjustment will not be reported in earnings and therefore will not have any material impact on our consolidated results of operations, but it is expected that it will have an impact on our consolidated financial position at the date of adoption of this Update. At this time, we have not calculated the estimated impact that this Update will have on our Allowance for Loan Losses, however, we anticipate it will have a significant impact on the methodology process we utilize to calculate the allowance. Alternative methodologies and software vendors are currently being considered. Data requirements and integrity are being reviewed and enhancements incorporated into standard processes. The Company is in the early stages of evaluation and implementation of the guidance. In November 2016, the FASB issued an Update (ASU 2016-18) to its guidance on “Statement of Cash Flows (Topic 230) Restricted Cash addresses diversity in practice from entities classifying and presenting transfers between cash and restricted cash as operating, investing or financing activities or as a combination of those activities in the statement of cash flows. The ASU requires entities to show the changes in the total cash, cash equivalents, restricted cash and restricted cash equivalents in the Statement of Cash Flows. As a result, transfers between such categories will no longer be presented in the Statement of Cash Flows. ASU 2016-18 is effective for the fiscal years beginning after December 31, 2017, and interim periods within those fiscal years. Early adoption is permitted provided all amendments are adopted in the same period. Management is evaluating the effect that this guidance will have on consolidated financial statements and disclosures. In March 2017, the FASB issued an Update (ASU 2017-08) to its guidance on “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20) related to premium amortization on purchased callable debt securities. The amendments in this Update shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. For public business entities, the amendments in this Update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. An entity should apply the amendments in this Update on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Additionally, in the period of adoption, an entity should provide disclosure about a change in accounting principle. The Company is currently evaluating the potential impact on our consolidated results of operations or financial position. In May 2017, the FASB issued an Update (ASU 2017-09) to its guidance on “Compensation - Stock Compensation (Topic 718) such that an entity must apply modification accounting to changes in the terms or conditions of a share-based payment award unless all of the following criteria are met: (1) The fair value of the modified award is the same as the fair value of the original award immediately before the modification. The standard indicates that if the modification does not affect any of the inputs to the valuation technique used to value the award, the entity is not required to estimate the value immediately before and after the modification. (2) The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the modification. (3) The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the modification. The amendments are effective for all entities for fiscal years beginning after December 15, 2017, including interim periods within those years. Early adoption is permitted, including adoption in an interim period. The Company is currently evaluating the potential impact of adoption of this ASU on our consolidated results of operations or financial position.

Securities (Tables)

Securities (Tables)	12 Months Ended
	Jun. 30, 2017
Securities [Abstract]
Components of Securities	Securities at June 30, 2017 consisted of the following: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Securities available-for-sale: U.S. government sponsored enterprises $ 4,566 $ 151 $ - $ 4,717 State and political subdivisions 57,885 227 - 58,112 Mortgage-backed securities-residential 4,868 72 27 4,913 Mortgage-backed securities-multi-family 20,344 483 62 20,765 Asset-backed securities 1 - - 1 Corporate debt securities 2,765 29 3 2,791 Total debt securities 90,429 962 92 91,299 Equity securities 62 122 - 184 Total securities available-for-sale 90,491 1,084 92 91,483 Securities held-to-maturity: U.S. government sponsored enterprises 6,000 - 53 5,947 State and political subdivisions 115,805 3,434 95 119,144 Mortgage-backed securities-residential 10,798 274 2 11,070 Mortgage-backed securities-multi-family 88,702 1,259 199 89,762 Corporate debt securities 1,000 - 5 995 Other securities 1,525 21 12 1,534 Total securities held-to-maturity 223,830 4,988 366 228,452 Total securities $ 314,321 $ 6,072 $ 458 $ 319,935 Securities at June 30, 2016 consisted of the following: (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Securities available-for-sale: U.S. government sponsored enterprises $ 4,587 $ 304 $ - $ 4,891 State and political subdivisions 60,491 8 - 60,499 Mortgage-backed securities-residential 6,360 185 5 6,540 Mortgage-backed securities-multi-family 22,594 1,285 - 23,879 Asset-backed securities 5 - - 5 Corporate debt securities 4,028 129 - 4,157 Total debt securities 98,065 1,911 5 99,971 Equity securities 62 90 - 152 Total securities available-for-sale 98,127 2,001 5 100,123 Securities held-to-maturity: U.S. government sponsored enterprises 2,000 32 - 2,032 State and political subdivisions 99,040 5,003 3 104,040 Mortgage-backed securities-residential 13,543 606 - 14,149 Mortgage-backed securities-multi-family 87,204 3,471 4 90,671 Corporate debt securities 1,000 - - 1,000 Other securities 2,148 18 - 2,166 Total securities held-to-maturity 204,935 9,130 7 214,058 Total securities $ 303,062 $ 11,131 $ 12 $ 314,181
Securities in Continuous Unrealized Loss Position	The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2017. Less Than 12 Months More Than 12 Months Total (In thousands, except number of securities) Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Securities available-for-sale: Mortgage-backed securities-residential $ 1,164 $ 27 1 $ - $ - - $ 1,164 $ 27 1 Mortgage-backed securities-multi-family 6,488 62 4 - - - 6,488 62 4 Corporate debt securities 760 3 2 - - - 760 3 2 Total securities available for sale 8,412 92 7 - - - 8,412 92 7 Securities held to maturity: U.S. government sponsored enterprises 5,947 53 2 - - - 5,947 53 2 State and political subdivisions 8,976 76 64 514 19 6 9,490 95 70 Mortgage-backed securities-residential 1,864 2 1 - - - 1,864 2 1 Mortgage-backed securities-multi-family 23,823 199 15 - - - 23,823 199 15 Corporate debt securities 995 5 1 - - - 995 5 1 Other securities 467 11 1 74 1 1 541 12 2 Total securities held to maturity 42,072 346 84 588 20 7 42,660 366 91 Total securities $ 50,484 $ 438 91 $ 588 $ 20 7 $ 51,072 $ 458 98 The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2016. Less Than 12 Months More Than 12 Months Total (In thousands, except number of securities) Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Securities available-for-sale: Mortgage-backed securities-residential $ 924 $ 5 1 $ - $ - - $ 924 $ 5 1 Total securities available-for-sale 924 5 1 - - - 924 5 1 Securities held-to-maturity: State and political subdivisions 272 2 1 175 1 2 447 3 3 Mortgage-backed securities-multi-family 499 4 4 - - - 499 4 4 Total securities held-to-maturity 771 6 5 175 1 2 946 7 7 Total securities $ 1,695 $ 11 6 $ 175 $ 1 2 $ 1,870 $ 12 8
Investments Classified by Contractual Maturity Date	The estimated fair values of debt securities at June 30, 2017, by contractual maturity are shown below. Expected maturities may differ from contractual maturities, because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. (In thousands) Available-for-sale debt securities Amortized Cost Fair Value Within one year $ 60,387 $ 60,641 After one year through five years 4,829 4,979 After five years through ten years - - After ten years - - Total available-for-sale debt securities 65,216 65,620 Mortgage-backed and asset-backed securities 25,213 25,679 Equity securities 62 184 Total available-for-sale securities 90,491 91,483 Held-to-maturity debt securities Within one year 17,403 17,642 After one year through five years 56,441 57,713 After five years through ten years 38,309 39,415 After ten years 12,177 12,850 Total held-to-maturity debt securities 124,330 127,620 Mortgage-backed 99,500 100,832 Total held-to-maturity securities 223,830 228,452 Total securities $ 314,321 $ 319,935

Loans (Tables)

Loans (Tables)	12 Months Ended
	Jun. 30, 2017
Loans [Abstract]
Major Loan Segments and Classes	Loan segments and classes at June 30, 2017 and 2016 are summarized as follows: At June 30, (In thousands) 2017 2016 Residential real estate: Residential real estate $ 245,331 $ 234,992 Residential construction and land 7,160 5,575 Multi-family 9,199 3,918 Commercial real estate: Commercial real estate 257,964 192,678 Commercial construction 28,430 20,159 Consumer loan: Home equity 21,076 20,893 Consumer installment 4,790 4,350 Commercial loans 60,381 48,725 Total gross loans 634,331 531,290 Allowance for loan losses (11,022 ) (9,485 ) Deferred fees and costs 878 959 Loans receivable, net $ 624,187 $ 522,764
Loan Balances by Internal Credit Quality Indicator	Loan balances by internal credit quality indicator as of June 30, 2017 are shown below. (In thousands Performing Watch Special Mention Substandard Total Residential real estate $ 242,592 $ 813 $ 91 $ 1,835 $ 245,331 Residential construction and land 7,160 - - - 7,160 Multi-family 9,110 - - 89 9,199 Commercial real estate 255,090 419 404 2,051 257,964 Commercial construction 28,254 - - 176 28,430 Home equity 20,858 - - 218 21,076 Consumer installment 4,770 10 - 10 4,790 Commercial loans 59,030 - 60 1,291 60,381 Total gross loans $ 626,864 $ 1,242 $ 555 $ 5,670 $ 634,331 Loan balances by internal credit quality indicator as of June 30, 2016 are shown below. (In thousands Performing Watch Special Mention Substandard Total Residential real estate $ 232,321 $ 757 $ 94 $ 1,820 $ 234,992 Residential construction and land 5,575 - - - 5,575 Multi-family 3,820 - - 98 3,918 Commercial real estate 190,293 52 531 1,802 192,678 Commercial construction 20,159 - - - 20,159 Home equity 20,555 321 12 5 20,893 Consumer installment 4,340 10 - - 4,350 Commercial loans 47,598 26 8 1,093 48,725 Total gross loans $ 524,661 $ 1,166 $ 645 $ 4,818 $ 531,290
Delinquent and/or Nonaccrual Loans by Past Due Status	The following table sets forth information regarding delinquent and/or nonaccrual loans as of June 30, 2017: (In thousands) 30-59 days 60-89 90 days past due Total Current Total Loans Loans on Non- accrual Residential real estate $ 2,088 $ 515 $ 935 $ 3,538 $ 241,793 $ 245,331 $ 1,240 Residential construction and land - - - - 7,160 7,160 - Multi-family - - - - 9,199 9,199 - Commercial real estate 74 1,070 540 1,684 256,280 257,964 1,452 Commercial construction - 176 - 176 28,254 28,430 176 Home equity 220 186 33 439 20,637 21,076 218 Consumer installment 22 10 10 42 4,748 4,790 10 Commercial loans 18 186 202 406 59,975 60,381 476 Total gross loans $ 2,422 $ 2,143 $ 1,720 $ 6,285 $ 628,046 $ 634,331 $ 3,572 The following table sets forth information regarding delinquent and/or nonaccrual loans as of June 30, 2016: (In thousands) 30-59 days 60-89 90 days past due Total Current Total Loans Loans on Non- accrual Residential real estate $ 1,533 $ 637 $ 938 $ 3,108 $ 231,884 $ 234,992 $ 1,207 Residential construction and land - - - - 5,575 5,575 - Multi-family 47 - - 47 3,871 3,918 - Commercial real estate 324 793 590 1,707 190,971 192,678 1,899 Commercial construction - - - - 20,159 20,159 - Home equity 17 321 17 355 20,538 20,893 18 Consumer installment 34 10 - 44 4,306 4,350 - Commercial loans 392 112 - 504 48,221 48,725 202 Total gross loans $ 2,347 $ 1,873 $ 1,545 $ 5,765 $ 525,525 $ 531,290 $ 3,326
Nonaccrual Loans, Interest Income Data	The table below details additional information related to nonaccrual loans: For the years ended June 30, (In thousands) 2017 2016 Interest income that would have been recorded if loans had been performing in accordance with original terms $ 227 $ 247 Interest income that was recorded on nonaccrual loans 148 142
Impaired Loans by Loan Portfolio Class	The tables below detail additional information on impaired loans at the date or periods indicated: As of June 30, 2017 For the year ended June 30, 2017 (In thousands) Recorded Investment Unpaid Principal Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential real estate $ - $ - $ - $ 176 $ - Commercial real estate 809 809 - 704 33 Home equity 186 186 - 64 9 Commercial loans 186 186 - 111 8 Total impaired loans with no allowance 1,181 1,181 - 1,055 50 With an allowance recorded: Residential real estate 1,455 1,455 278 1,302 51 Commercial real estate 440 440 135 922 34 Commercial construction 176 176 23 15 - Commercial loans - - - 41 2 Total impaired loans with allowance 2,071 2,071 436 2,280 87 Total impaired loans: Residential real estate 1,455 1,455 278 1,478 51 Commercial real estate 1,249 1,249 135 1,626 67 Commercial construction 176 176 23 15 - Home equity 186 186 - 64 9 Commercial loans 186 186 - 152 10 Total impaired loans $ 3,252 $ 3,252 $ 436 $ 3,335 $ 137 As of June 30, 2016 For the year ended June 30, 2016 (In thousands) Recorded Investment Unpaid Principal Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential real estate $ 266 $ 266 $ - $ 243 $ 5 Commercial real estate 1,024 1,231 - 1,085 29 Home equity 5 5 - 48 1 Total impaired loans with no allowance 1,295 1,502 - 1,376 35 With an allowance recorded: Residential real estate 1,457 1,457 267 1,411 57 Commercial real estate 405 405 61 487 25 Commercial loans 85 85 2 89 5 Total impaired loans with allowance 1,947 1,947 330 1,987 87 Total impaired loans: Residential real estate 1,723 1,723 267 1,654 62 Commercial real estate 1,429 1,636 61 1,572 54 Home equity 5 5 - 48 1 Commercial loans 85 85 2 89 5 Total impaired loans $ 3,242 $ 3,449 $ 330 $ 3,363 $ 122
Activity and Allocation of Allowance for Loan Losses	The allowance is allocated to each loan class based on historical loss experience, current economic conditions, and other considerations. Activity for the year ended June 30, 2017 (In thousands) Balance June 30, 2016 Charge-offs Recoveries Provision Balance June 30, 2017 Residential real estate $ 2,396 $ 90 $ - $ (17 ) $ 2,289 Residential construction and land 75 - - 14 89 Multi-family 22 - - 21 43 Commercial real estate 4,541 39 - 1,087 5,589 Commercial construction 502 - - 185 687 Home equity 309 - - (75 ) 234 Consumer installment 228 270 88 185 231 Commercial loans 1,412 66 3 331 1,680 Unallocated - - - 180 180 Total $ 9,485 $ 465 $ 91 $ 1,911 $ 11,022 Allowance for Loan Losses Loans Receivable Ending Balance June 30, 2017 Impairment Analysis Ending Balance June 30, 2017 Impairment Analysis (In thousands) Individually Evaluated Collectively Evaluated Individually Evaluated Collectively Evaluated Residential real estate $ 278 $ 2,011 $ 1,455 $ 243,876 Residential construction and land - 89 - 7,160 Multi-family - 43 - 9,199 Commercial real estate 135 5,454 1,249 256,715 Commercial construction 23 664 176 28,254 Home equity - 234 186 20,890 Consumer installment - 231 - 4,790 Commercial loans - 1,680 186 60,195 Unallocated - 180 - - Total $ 436 $ 10,586 $ 3,252 $ 631,079 Activity for the year ended June 30, 2016 (In thousands) Balance June 30, 2015 Charge-offs Recoveries Provision Balance June 30, 2016 Residential real estate $ 2,454 $ - $ - $ (58 ) $ 2,396 Residential construction and land 50 - - 25 75 Multi-family 40 - - (18 ) 22 Commercial real estate 3,699 162 17 987 4,541 Commercial construction 233 - - 269 502 Home equity 314 - - (5 ) 309 Consumer installment 223 245 78 172 228 Commercial loans 1,129 20 2 301 1,412 Total $ 8,142 $ 427 $ 97 $ 1,673 $ 9,485 Allowance for Loan Losses Loans Receivable Ending Balance June 30, 2016 Impairment Analysis Ending Balance June 30, 2016 Impairment Analysis (In thousands) Individually Evaluated Collectively Evaluated Individually Evaluated Collectively Evaluated Residential real estate $ 267 $ 2,129 $ 1,723 $ 233,269 Residential construction and land - 75 - 5,575 Multi-family - 22 - 3,918 Commercial real estate 61 4,480 1,429 191,249 Commercial construction - 502 - 20,159 Home equity - 309 5 20,888 Consumer installment - 228 - 4,350 Commercial loans 2 1,410 85 48,640 Total $ 330 $ 9,155 $ 3,242 $ 528,048
Schedule of Foreclosed Real Estate	The following table sets forth information regarding FRE as of June 30, 2017 and 2016: (in thousands) 2017 2016 Residential real estate $ - $ 61 Land - 65 Commercial real estate 799 244 Total foreclosed real estate $ 799 $ 370

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Jun. 30, 2017
Premises and Equipment [Abstract]
Summary of Premises and Equipment	A summary of premises and equipment at June 30, 2017 and 2016, is as follows: (In thousands) 2017 2016 Land $ 2,883 $ 2,883 Building and improvements 15,822 15,792 Furniture and equipment 4,280 4,233 Less: accumulated depreciation (9,370 ) (8,732 ) Total premises and equipment $ 13,615 $ 14,176

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Jun. 30, 2017
Deposits [Abstract]
Schedule of Deposits	Major classifications of deposits at June 30, 2017 and 2016 are summarized as follows: (In thousands) 2017 2016 Noninterest-bearing deposits $ 95,929 $ 88,254 Certificates of deposit 53,742 50,666 Savings deposits 197,288 177,309 Money market deposits 119,806 112,905 NOW deposits 392,770 309,753 Total deposits $ 859,535 $ 738,887
Schedule of Deposits by Time Remaining on Maturity	The following indicates the amount of certificates of deposit by time remaining to maturity as of June 30, 2017. (In thousands) 3 months 3 to 6 7 to 12 Over 12 Total Certificates of deposit less than $100,000 $ 20,468 $ 4,618 $ 4,326 $ 11,499 $ 40,911 Certificates of deposit $100,000 or more 2,784 1,368 1,181 7,498 12,831 Total certificates of deposit $ 23,252 $ 5,986 $ 5,507 $ 18,997 $ 53,742
Schedule of Certificates of Deposits by Year of Maturity	Scheduled maturities of certificates of deposit at June 30, 2017 were as follows: (In thousands) The year ended June 30, 2018 $ 34,745 2019 7,940 2020 7,436 2021 2,349 2022 1,272 $ 53,742

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Jun. 30, 2017
Borrowings [Abstract]
Scheduled Maturities of Term Borrowings	Scheduled maturities of long-term borrowings at June 30, 2017 were as follows: (In thousands) Within the year ended June 30, 2018 $ 4,500 2019 5,500 2020 6,000 2021 1,800 2022 4,850 $ 22,650

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Jun. 30, 2017
Accumulated Other Comprehensive Loss [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss as of June 30, 2017 and 2016, respectively, are presented in the following table: (In thousands) 2017 2016 Unrealized gains on available-for-sale securities, net of tax $ 612 $ 1,224 Unrealized loss on securities transferred to held-to-maturity, net of tax - (2 ) Net losses and past service liability for defined benefit plan, net of tax (1,604 ) (1,947 ) Accumulated other comprehensive loss $ (992 ) $ (725 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Jun. 30, 2017
Employee Benefit Plans [Abstract]
Information Regarding Single-Employer Defined Benefit Pension Plan	Information regarding the single-employer defined benefit pension plan at June 30, 2017 and 2016 is as follows: (In thousands) Change in projected benefit obligation: 2017 2016 Benefit obligation at beginning of year $ 6,171 $ 5,457 Interest cost 215 232 Actuarial (gain) loss (298 ) 695 Benefits paid (221 ) (213 ) Benefit obligation at June 30 5,867 6,171 Change in fair value of plan assets: Fair value of plan assets at beginning of year 4,391 4,481 Actual return on plan assets 312 123 Employer contributions 576 - Benefits paid (221 ) (213 ) Fair value of plan assets at June 30 5,058 4,391 Underfunded status at June 30 included in other liabilities $ 809 $ 1,780
Schedule of Net Periodic Pension Costs	The components of net periodic pension costs related to the defined benefit pension plan for the years ended June 30, 2017 and 2016 were as follows: (In thousands) 2017 2016 Interest cost $ 215 $ 232 Expected return on plan assets (231 ) (307 ) Amortization of net loss 197 135 Net periodic pension cost $ 181 $ 60
Schedule of Amounts Recognized in Other Comprehensive Loss	Changes in plan assets and benefit obligations recognized in other comprehensive loss during the years ended June 30, 2017 and 2016 consisted of the following: (In thousands) 2017 2016 Actuarial gain (loss) on plan assets and benefit obligations $ 576 $ (744 ) Deferred tax (expense) benefit ( 233 ) 288 Net change in plan assets and benefit obligations recognized in other comprehensive income $ 343 $ (456 )
Schedule of Amounts Recognized in Financial Condition	Amounts recognized in our consolidated statements of financial condition related to our pension plan for the years ended June 30, 2017 and 2016 are as follows: (In thousands) Other liabilities: 2017 2016 Projected benefit obligation in excess of fair value of pension plan $ 809 $ 1,780 Accumulated other comprehensive loss, net of taxes: Net losses and past service liability $ (1,604 ) $ (1,947 )
Schedule of Assumptions Used	The principal actuarial assumptions used were as follows: Projected benefit obligation: 2017 2016 Discount rate 3.81 % 3.55 % Net periodic pension expense: Amortization period, in years 12 13 Discount rate 3.55 % 4.32 % Expected long-term rate of return on plan assets 5.00 % 7.00 %
Schedule of Allocation of Plan Assets	The weighted average asset allocation and fair value of our funded pension plan at June 30, 2017 and 2016 was as follows: (Dollars in thousands) 2017 2016 Money market accounts $ - - % $ 16 0.4 % Mutual funds 5,058 100.0 4,375 99.6 Total plan assets $ 5,058 100.0 % $ 4,391 100.0 %
Schedule of Expected Benefit Payments	Expected benefit payments under the pension plan over the next ten years at June 30, 2017 are as follows: (In thousands) 2018 $ 225 2019 223 2020 223 2021 222 2022 227 2023-2027 1,209

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Jun. 30, 2017
Stock-Based Compensation [Abstract]
Summary of Stock Option Activity	A summary of the Company’s stock option activity and related information for its option plans for the years ended June 30, 2017 and 2016 is as follows: 2017 2016 Options Weighted Average Exercise Price Per Share Options Weighted Average Exercise Price Per Share Outstanding at beginning of year 64,770 $ 6.25 95,670 $ 6.25 Exercised (27,000 ) $ 6.25 (30,900 ) $ 6.25 Outstanding at year end 37,770 $ 6.25 64,770 $ 6.25 Exercisable at year end 37,770 $ 6.25 64,770 $ 6.25
Schedule of Options Outstanding and Exercisable	The following table presents stock options outstanding and exercisable at June 30, 2017: Options Outstanding and Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Life Weighted Average Exercise Price $ 6.25 37,770 1.25 $ 6.25
Summary of Phantom Stock Options Activity	A summary of the Company’s phantom stock option activity and related information for its option plan for the years ended June 30, 2017 and 2016 is as follows: 2017 2016 Number of options outstanding at beginning of year 1,352,554 1,257,508 Options granted 578,200 493,760 Options forfeited - (2,000 ) Options paid in cash upon vesting (408,034 ) (396,714 ) Number of options outstanding at period end 1,522,720 1,352,554 (In thousands) 2017 2016 Cash paid out on options vested $ 845 $ 711 Compensation expense recognized 1,448 1,013

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	2017 2016 Net Income $ 11,187,000 $ 8,963,000 Weighted Average Shares – Basic 8,495,022 8,459,327 Effect of Dilutive Stock Options 18,107 16,965 Weighted Average Shares - Dilute 8,513,129 8,476,292 Earnings per share - Basic $ 1.32 $ 1.06 Earnings per share - Diluted $ 1.31 $ 1.06

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Jun. 30, 2017
Income Taxes [Abstract]
Provision for Income Taxes	The provision for income taxes consists of the following for the years ended June 30, 2017 and 2016: (In thousands) 2017 2016 Current expense: Federal $ 3,591 $ 3,137 State 409 256 Total current expense 4,000 3,393 Deferred benefit (259 ) (714 ) Total provision for income taxes $ 3,741 $ 2,679
Effective Tax Rate Reconciliation	The effective tax rate differs from the federal statutory rate as follows for the years ended June 30, 2017 and 2016: 2017 2016 Tax based on federal statutory rate 34.00 % 34.00 % State income taxes, net of federal benefit 0.89 0.75 Tax-exempt income (8.20 ) (9.05 ) Captive insurance premium income (2.28 ) (2.95 ) Other, net 0.55 0.26 Total income tax expense 24.96 % 23.01 %
Deferred Tax Assets and Liabilities	The components of the deferred tax assets and liabilities at June 30 were as follows: (In thousands) 2017 2016 Deferred tax assets: Allowance for loan losses $ 4,220 $ 3,669 Pension benefits 310 689 Other benefit plans 1,957 1,137 Total deferred tax assets 6,487 5,495 Deferred tax liabilities: Depreciation 1,392 1,346 Loan costs 1,051 894 Real estate investment trust income 3,052 2,283 Unrealized gains on securities 379 771 Other 224 225 Total deferred tax liabilities 6,098 5,519 Net deferred tax asset (liability) included in prepaid expenses and other assets (other liabilities) $ 389 $ (24 )

Commitments and Contingent Li40

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Jun. 30, 2017
Commitments and Contingent Liabilities [Abstract]
Unfunded Loan Commitments	The Bank of Greene County’s unfunded loan commitments and unused lines of credit are as follows at June 30, 2017 and 2016: (In thousands) 2017 2016 Unfunded loan commitments $ 41,082 $ 41,383 Unused lines of credit 51,440 30,636 Total commitments $ 92,522 $ 72,019

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Jun. 30, 2017
Operating Leases [Abstract]
Schedule of Non-Cancelable Lease Commitments	Minimum non-cancelable lease commitments for future years ending June 30 are as follows: (In thousands) The year ended June 30, Annual Lease Payments 2018 $ 159 2019 100 2020 81 2021 73 2022 30 Thereafter 0

Fair Value Measurements and F42

Fair Value Measurements and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Jun. 30, 2017
Fair Value Measurements and Fair Value of Financial Instruments [Abstract]
Fair Value, Assets Measured on Recurring Basis	For assets measured at fair value on a recurring basis, the fair value measurements by level within the fair value hierarchy used are as follows: Fair Value Measurements Using (In thousands) June 30, 2017 Quoted Prices For Identical Assets (Level 1) Significant Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: U.S. Government sponsored enterprises $ 4,717 $ - $ 4,717 $ - State and political subdivisions 58,112 - 58,112 - Mortgage-backed securities-residential 4,913 - 4,913 - Mortgage-backed securities-multi-family 20,765 - 20,765 - Asset-backed securities 1 1 - - Corporate debt securities 2,791 2,791 - - Equity securities 184 184 - - Securities available-for-sale $ 91,483 $ 2,976 $ 88,507 $ - Fair Value Measurements Using (In thousands) June 30, 2016 Quoted Prices For Identical Assets (Level 1) Significant Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: U.S. Government sponsored enterprises $ 4,891 $ - $ 4,891 $ - State and political subdivisions 60,499 - 60,499 - Mortgage-backed securities-residential 6,540 - 6,540 - Mortgage-backed securities-multi-family 23,879 - 23,879 - Asset-backed securities 5 5 - - Corporate debt securities 4,157 4,157 - - Equity securities 152 152 - - Securities available-for-sale $ 100,123 $ 4,314 $ 95,809 $ -
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	Estimates of fair value used for other collateral supporting commercial loans generally are based on assumptions not observable in the marketplace and therefore such valuations have been classified as Level 3. Fair Value Measurements Using (In thousands) Recorded Investment Related Allowance Fair Value (Level 1) (Level 2) (Level 3) June 30, 2017 Impaired loans $ 1,175 $ 330 $ 845 $ - $ - $ 845 Foreclosed real estate 799 - 799 - - 799 June 30, 2016 Impaired loans $ 655 $ 164 $ 491 $ - $ - $ 491 Foreclosed real estate 370 - 370 - - 370
Fair Value Inputs, Assets, Quantitative Information	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which Level 3 inputs were utilized to determine fair value: (Dollars in thousands) Fair Value Valuation Technique Unobservable Input Range Weighted Average June 30, 2017 Impaired loans $ 845 Appraisal of collateral (1) Appraisal adjustments (2) 25.00%-42.52 % 28.46 % Liquidation expenses (3) 3.45%-7.38 % 5.93 % Foreclosed real estate 799 Appraisal of collateral (1) Appraisal adjustments (2) 0.00-0.00 % 0.00 % Liquidation expenses (3) 11.64%-17.92 % 16.29 % June 30, 2016 Impaired loans $ 491 Appraisal of collateral (1) Appraisal adjustments (2) 0.00%-38.85 % 21.01 % Liquidation expenses (3) 0.00%-8.35 % 4.92 % Foreclosed real estate 370 Appraisal of collateral (1) Appraisal adjustments (2) 0.00-54.17 % 8.83 % Liquidation expenses (3) 0.42%-12.67 % 7.81 % (1) Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable. (2) Appraisals may be adjusted downwards by management for qualitative factors such as economic conditions. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received or age of the appraisal. (3) Appraisals may be adjusted downwards by management for items such as the estimated costs to liquidate the collateral.
Carrying Amounts and Estimated Fair Value	The carrying amounts and estimated fair value of financial instruments are as follows: (In thousands) June 30, 2017 Fair Value Measurements Using Carrying Amount Fair Value (Level 1) (Level 2) (Level 3) Cash and cash equivalents $ 16,277 $ 16,277 $ 16,277 $ - $ - Long term certificate of deposit 2,145 2,145 2,145 - - Securities available-for-sale 91,483 91,483 2,976 88,507 - Securities held-to-maturity 223,830 228,452 - 228,452 - Federal Home Loan Bank stock 2,131 2,131 - 2,131 - Net loans receivable 624,187 629,690 - - 629,690 Accrued interest receivable 4,033 4,033 - 4,033 - Deposits 859,535 859,715 - 859,715 - Borrowings from Federal Home Loan Bank 29,550 29,411 - 29,411 - Accrued interest payable 92 92 - 92 - (In thousands) June 30, 2016 Fair Value Measurements Using Carrying Amount Fair Value (Level 1) (Level 2) (Level 3) Cash and cash equivalents $ 15,895 $ 15,895 $ 15,895 $ - $ - Long term certificate of deposit 2,210 2,210 2,210 - - Securities available-for-sale 100,123 100,123 4,314 95,809 - Securities held-to-maturity 204,935 214,058 - 214,058 - Federal Home Loan Bank stock 2,752 2,752 - 2,752 - Net loans receivable 522,764 533,721 - - 533,721 Accrued interest receivable 3,610 3,610 - 3,610 - Deposits 738,887 739,087 - 739,087 - Borrowings from Federal Home Loan Bank 46,400 46,562 - 46,562 - Accrued interest payable 74 74 - 74 -

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Jun. 30, 2017
Regulatory Matters [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	(Dollars in thousands) Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Capital Conservation Buffer The Bank of Greene County Amount Ratio Amount Ratio Amount Ratio Actual Required As of June 30, 2017: Total risk-based capital $ 87,719 15.8 % $ 44,433 8.0 % $ 55,542 10.0 % 7.794 % 1.250 % Tier 1 risk-based capital 80,671 14.5 33,325 6.0 44,433 8.0 8.525 1.250 Common equity tier 1 capital 80,671 14.5 24.994 4.5 36,102 6.5 10.024 1.250 Tier 1 leverage ratio 80,671 8.5 38,056 4.0 47,571 5.0 4.479 1.250 As of June 30, 2016: Total risk-based capital $ 76,666 16.3 % $ 37,577 8.0 % $ 46,972 10.0 % 8.322 % 0.625 % Tier 1 risk-based capital 70,709 15.1 28,183 6.0 37,577 8.0 9.054 0.625 Common equity tier 1 capital 70,709 15.1 21,137 4.5 30,532 6.5 10.554 0.625 Tier 1 leverage ratio 70,709 8.4 33,815 4.0 42,268 5.0 4.364 0.625 Greene County Commercial Bank As of June 30, 2017: Total risk-based capital $ 30,095 40.1 % $ 6,011 8.0 % $ 7,514 10.0 % 32.053 % 1.250 % Tier 1 risk-based capital 30,095 40.1 4,508 6.0 6,011 8.0 34.053 1.250 Common equity tier 1 capital 30,095 40.1 3,381 4.5 4,884 6.5 35.550 1.250 Tier 1 leverage ratio 30,095 9.62 12,508 4.0 15,635 5.0 5.624 1.250 As of June 30, 2016: Total risk-based capital $ 23,065 40.8 % $ 4,518 8.0 % $ 5,648 10.0 % 32.840 % 0.625 % Tier 1 risk-based capital 23,065 40.8 3,389 6.0 4,518 8.0 34.840 0.625 Common equity tier 1 capital 23,065 40.8 2,541 4.5 3,671 6.5 36.340 0.625 Tier 1 leverage ratio 23,065 8.1 11,409 4.0 14,262 5.0 4.086 0.625

Condensed Financial Statement44

Condensed Financial Statements of Greene County Bancorp, Inc. (Tables)	12 Months Ended
	Jun. 30, 2017
Condensed Financial Statements of Greene County Bancorp, Inc. [Abstract]
Condensed Balance Sheet	Greene County Bancorp, Inc. Condensed Statements of Financial Condition As of June 30, 2017 and 2016 (In thousands) ASSETS 2017 2016 Cash and cash equivalents $ 2,015 $ 2,641 Investment in subsidiaries 81,540 71,723 Prepaid expenses and other assets 53 48 Total assets $ 83,608 $ 74,412 LIABILITIES AND SHAREHOLDERS’ EQUITY Total liabilities $ 87 $ 111 111 Total shareholders’ equity 83,521 74,301 Total liabilities and shareholders’ equity $ 83,608 $ 74,412
Condensed Income Statement	Greene County Bancorp, Inc. Condensed Statements of Income For the Years Ended June 30, 2017 and 2016 (In thousands) 2017 2016 INCOME: Equity in undistributed net income of subsidiaries $ 9,484 $ 5,239 Dividend distributed by subsidiary 1,904 4,004 Interest-earning deposits 6 6 Total Income 11,394 9,249 OPERATING EXPENSES: Legal fees 46 66 Other 161 220 Total operating expenses 207 286 Net income $ 11,187 $ 8,963
Condensed Comprehensive Income Statement	Greene County Bancorp, Inc. Condensed Statements of Comprehensive Income For the Years Ended June 30, 2017 and 2016 (In thousands) 2017 2016 Net income $ 11,187 $ 8,963 Other comprehensive income: Unrealized holding (losses) gains on available-for-sale securities, net of income tax (benefit) expense of ($392) and $328, respectively (612 ) 520 Accretion of unrealized loss on securities transferred to held-to-maturity, net of income taxes of $1 and $6, respectively 2 9 Pension actuarial gain (loss), net of income tax expense (benefit) of $158 and ($340) 221 (539 ) Amortization of pension actuarial losses recognized in salaries and benefits, net of income taxes of $75 and $52, respectively 122 83 Total other comprehensive (loss) income net of taxes (267 ) 73 Comprehensive income $ 10,920 $ 9,036
Condensed Cash Flow Statement	Greene County Bancorp, Inc. Condensed Statements of Cash Flows For the Years Ended June 30, 2017 and 2016 (In thousands) Cash flow from operating activities: 2017 2016 Net Income $ 11,187 $ 8,963 Adjustments to reconcile net income to cash provided by operating activities: Undistributed earnings of subsidiaries (9,484 ) (5,239 ) Tax benefit of stock based compensation (51 ) (6 ) Net increase in prepaid expenses and other assets (5 ) (27 ) Net increase in total liabilities 27 61 Net cash provided by operating activities 1,674 3,752 Cash flows from Investing Activities: Investment in subsidiary (600 ) - Net cash used by investing activities (600 ) - Cash flows from financing activities: Payment of cash dividends (1,920 ) (1,854 ) Proceeds from exercise of stock options 169 193 Excess tax benefit from share-based payment arrangements 51 6 Net cash used in financing activities (1,700 ) (1,655 ) Net (decrease) increase in cash and cash equivalents (626 ) 2,097 Cash and cash equivalents at beginning of year 2,6414 544 Cash and cash equivalents at end of year $ 2,015 $ 2,641

Summary of Significant Accoun45

Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Officeshares	Jun. 30, 2016USD ($)
Nature of Operations [Abstract]
Number of offices | Office	13
Cash and Cash Equivalents [Abstract]
Interest-bearing deposits in banks and other financial institutions	$ 6,100	$ 6,000
Income Recognition on Impaired and Nonaccrual loans [Abstract]
Threshold period of delinquency after which a loan is placed on nonaccrual status	90 days
Treasury Stock [Abstract]
Total number of shares repurchased under the plan (in shares) | shares	124,956
Federal Home Loan Bank Stock [Abstract]
Other-than-temporary impairment charge	$ 0	0
Advertising [Abstract]
Advertising expense	$ 387	$ 373
Maximum [Member]
Treasury Stock [Abstract]
Number of shares authorized for repurchase (in shares) | shares	184,692
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	39 years
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	8 years

Balances at Other Banks (Detail

Balances at Other Banks (Details) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Balances at Other Banks [Abstract]
Restricted cash and cash equivalents	$ 2.1	$ 1.7

Securities (Details)

Securities (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Category	Jun. 30, 2016USD ($)
Securities [Abstract]
Number of categories utilized under risk management approach of diversified investing | Category	3
Available-for-sale debt securities [Abstract]
Amortized cost	$ 90,429	$ 98,065
Gross unrealized gains	962	1,911
Gross unrealized losses	92	5
Estimated fair value	91,299	99,971
Available-for-sale equity securities and other [Abstract]
Amortized cost	62	62
Gross unrealized gains	122	90
Gross unrealized losses	0	0
Estimated fair value	184	152
Available-for-sale securities [Abstract]
Amortized cost	90,491	98,127
Gross unrealized gains	1,084	2,001
Gross unrealized losses	92	5
Estimated fair value	91,483	100,123
Held-to-maturity securities [Abstract]
Amortized cost	223,830	204,935
Gross unrealized gains	4,988	9,130
Gross unrealized losses	366	7
Estimated fair value	228,452	214,058
Total Securities [Abstract]
Amortized cost	314,321	303,062
Gross unrealized gains	6,072	11,131
Gross unrealized losses	458	12
Estimated fair value	319,935	314,181
U.S. Government Sponsored Enterprises [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	4,566	4,587
Gross unrealized gains	151	304
Gross unrealized losses	0	0
Estimated fair value	4,717	4,891
State and Political Subdivisions [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	57,885	60,491
Gross unrealized gains	227	8
Gross unrealized losses	0	0
Estimated fair value	58,112	60,499
Mortgage-backed Securities-Residential [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	4,868	6,360
Gross unrealized gains	72	185
Gross unrealized losses	27	5
Estimated fair value	4,913	6,540
Mortgage-backed Securities-Multi-Family [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	20,344	22,594
Gross unrealized gains	483	1,285
Gross unrealized losses	62	0
Estimated fair value	20,765	23,879
Asset-Backed Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	1	5
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	1	5
Corporate Debt Securities [Member]
Available-for-sale debt securities [Abstract]
Amortized cost	2,765	4,028
Gross unrealized gains	29	129
Gross unrealized losses	3	0
Estimated fair value	2,791	4,157
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity securities [Abstract]
Amortized cost	6,000	2,000
Gross unrealized gains	0	32
Gross unrealized losses	53	0
Estimated fair value	5,947	2,032
State and Political Subdivisions [Member]
Held-to-maturity securities [Abstract]
Amortized cost	115,805	99,040
Gross unrealized gains	3,434	5,003
Gross unrealized losses	95	3
Estimated fair value	119,144	104,040
Mortgage-backed Securities-Residential [Member]
Held-to-maturity securities [Abstract]
Amortized cost	10,798	13,543
Gross unrealized gains	274	606
Gross unrealized losses	2	0
Estimated fair value	11,070	14,149
Mortgage-backed Securities-Multi-Family [Member]
Held-to-maturity securities [Abstract]
Amortized cost	88,702	87,204
Gross unrealized gains	1,259	3,471
Gross unrealized losses	199	4
Estimated fair value	89,762	90,671
Corporate Debt Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,000	1,000
Gross unrealized gains	0	0
Gross unrealized losses	5	0
Estimated fair value	995	1,000
Other Securities [Member]
Held-to-maturity securities [Abstract]
Amortized cost	1,525	2,148
Gross unrealized gains	21	18
Gross unrealized losses	12	0
Estimated fair value	$ 1,534	$ 2,166

Securities, Securities in Conti

Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Security	Jun. 30, 2016USD ($)Security
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 8,412	$ 924
Less than 12 months, unrealized losses	$ 92	$ 5
Less than 12 months, number of securities | Security	7	1
More than 12 months, fair value	$ 0	$ 0
More than 12 months, unrealized losses	$ 0	$ 0
More than 12 months, number of securities | Security	0	0
Total, fair value	$ 8,412	$ 924
Total, unrealized losses	$ 92	$ 5
Total, number of securities | Security	7	1
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 42,072	$ 771
Less than 12 months, unrealized losses	$ 346	$ 6
Less than 12 months, number of securities | Security	84	5
More than 12 months, fair value	$ 588	$ 175
More than 12 months, unrealized losses	$ 20	$ 1
More than 12 months, number of securities | Security	7	2
Total, fair value	$ 42,660	$ 946
Total, unrealized losses	$ 366	$ 7
Total, number of securities | Security	91	7
Total Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 50,484	$ 1,695
Less than 12 months, unrealized losses	$ 438	$ 11
Less than 12 months, number of securities | Security	91	6
More than 12 months, fair value	$ 588	$ 175
More than 12 months, unrealized losses	$ 20	$ 1
More than 12 months, number of securities | Security	7	2
Total, fair value	$ 51,072	$ 1,870
Total, unrealized losses	$ 458	$ 12
Total, number of securities | Security	98	8
Available for sale securities transferred at fair value to held to maturity	$ 0	$ 0
Gross realized gains on sale of available-for-sale securities	0	0
Other-than-temporary impairment losses	0	0
Net realized gains (losses)	0	0
Mortgage-backed Securities-Residential [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	1,164	924
Less than 12 months, unrealized losses	$ 27	$ 5
Less than 12 months, number of securities | Security	1	1
More than 12 months, fair value	$ 0	$ 0
More than 12 months, unrealized losses	$ 0	$ 0
More than 12 months, number of securities | Security	0	0
Total, fair value	$ 1,164	$ 924
Total, unrealized losses	$ 27	$ 5
Total, number of securities | Security	1	1
Mortgage-backed Securities-Multi-Family [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 6,488
Less than 12 months, unrealized losses	$ 62
Less than 12 months, number of securities | Security	4
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 6,488
Total, unrealized losses	$ 62
Total, number of securities | Security	4
Corporate Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 760
Less than 12 months, unrealized losses	$ 3
Less than 12 months, number of securities | Security	2
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 760
Total, unrealized losses	$ 3
Total, number of securities | Security	2
U.S. Government Sponsored Enterprises [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 5,947
Less than 12 months, unrealized losses	$ 53
Less than 12 months, number of securities | Security	2
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 5,947
Total, unrealized losses	$ 53	$ 0
Total, number of securities | Security	2
State and Political Subdivisions [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 8,976	272
Less than 12 months, unrealized losses	$ 76	$ 2
Less than 12 months, number of securities | Security	64	1
More than 12 months, fair value	$ 514	$ 175
More than 12 months, unrealized losses	$ 19	$ 1
More than 12 months, number of securities | Security	6	2
Total, fair value	$ 9,490	$ 447
Total, unrealized losses	$ 95	$ 3
Total, number of securities | Security	70	3
Mortgage-backed Securities-Residential [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 1,864
Less than 12 months, unrealized losses	$ 2
Less than 12 months, number of securities | Security	1
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 1,864
Total, unrealized losses	$ 2	$ 0
Total, number of securities | Security	1
Mortgage-backed Securities-Multi-Family [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 23,823	499
Less than 12 months, unrealized losses	$ 199	$ 4
Less than 12 months, number of securities | Security	15	4
More than 12 months, fair value	$ 0	$ 0
More than 12 months, unrealized losses	$ 0	$ 0
More than 12 months, number of securities | Security	0	0
Total, fair value	$ 23,823	$ 499
Total, unrealized losses	$ 199	$ 4
Total, number of securities | Security	15	4
Corporate Debt Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 995
Less than 12 months, unrealized losses	$ 5
Less than 12 months, number of securities | Security	1
More than 12 months, fair value	$ 0
More than 12 months, unrealized losses	$ 0
More than 12 months, number of securities | Security	0
Total, fair value	$ 995
Total, unrealized losses	$ 5	$ 0
Total, number of securities | Security	1
Other Securities [Member]
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 467
Less than 12 months, unrealized losses	$ 11
Less than 12 months, number of securities | Security	1
More than 12 months, fair value	$ 74
More than 12 months, unrealized losses	$ 1
More than 12 months, number of securities | Security	1
Total, fair value	$ 541
Total, unrealized losses	$ 12	$ 0
Total, number of securities | Security	2

Securities, Securities by Contr

Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 60,387
After one year through five years	4,829
After five years through ten years	0
After ten years	0
Total available-for-sale debt securities	65,216
Mortgage-backed and asset-backed securities	25,213
Equity securities	62	$ 62
Amortized cost	90,491	98,127
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	60,641
After one year through five years	4,979
After five years through ten years	0
After ten years	0
Total available-for-sale debt securities	65,620
Mortgage-backed and asset-backed securities	25,679
Equity securities	184	152
Estimated fair value	91,483	100,123
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	17,403
After one year through five years	56,441
After five years through ten years	38,309
After ten years	12,177
Total held-to-maturity debt securities	124,330
Mortgage-backed	99,500
Amortized cost	223,830	204,935
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	17,642
After one year through five years	57,713
After five years through ten years	39,415
After ten years	12,850
Total held-to-maturity debt securities	127,620
Mortgage-backed securities	100,832
Estimated fair value	228,452	214,058
Total Securities [Abstract]
Amortized cost	314,321	303,062
Estimated fair value	319,935	314,181
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	305,700	291,600
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 2,800	$ 4,200

Loans, Major Loan Segments and

Loans, Major Loan Segments and Classes (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	$ 634,331	$ 531,290
Allowance for loan losses	(11,022)	(9,485)	$ (8,142)
Deferred fees and costs	878	959
Net loans receivable	624,187	522,764
Residential Real Estate [Member] | Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	245,331	234,992
Allowance for loan losses	(2,289)	(2,396)	(2,454)
Residential Real Estate [Member] | Construction and Land [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	7,160	5,575
Allowance for loan losses	(89)	(75)	(50)
Residential Real Estate [Member] | Multi-family [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	9,199	3,918
Allowance for loan losses	(43)	(22)	(40)
Commercial Real Estate [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	257,964	192,678
Allowance for loan losses	(5,589)	(4,541)	(3,699)
Commercial Real Estate [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	28,430	20,159
Allowance for loan losses	(687)	(502)	(233)
Consumer Loan [Member] | Home Equity [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	21,076	20,893
Allowance for loan losses	(234)	(309)	(314)
Consumer Loan [Member] | Consumer Installment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	4,790	4,350
Allowance for loan losses	(231)	(228)	(223)
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total gross loans	60,381	48,725
Allowance for loan losses	$ (1,680)	$ (1,412)	$ (1,129)

Loans, Loan Balances by Interna

Loans, Loan Balances by Internal Credit Quality Indicator (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Segment	Jun. 30, 2016USD ($)
Financing Receivable, Recorded Investment [Line Items]
Number of segments within loan portfolio | Segment	4
Total gross loans	$ 634,331	$ 531,290
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	626,864	524,661
Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,242	1,166
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	555	645
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 5,670	4,818
Residential Real Estate [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan-to-value ratio	89.90%
Residential Real Estate [Member] | Residential Mortgage with Private Mortgage Insurance [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan-to-value ratio	95.00%
Residential Real Estate [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 245,331	234,992
Residential Real Estate [Member] | Residential Real Estate [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	242,592	232,321
Residential Real Estate [Member] | Residential Real Estate [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	813	757
Residential Real Estate [Member] | Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	91	94
Residential Real Estate [Member] | Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	1,835	1,820
Residential Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,160	5,575
Residential Real Estate [Member] | Construction and Land [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	7,160	5,575
Residential Real Estate [Member] | Construction and Land [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Construction and Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	9,199	3,918
Residential Real Estate [Member] | Multi-family [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	9,110	3,820
Residential Real Estate [Member] | Multi-family [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Residential Real Estate [Member] | Multi-family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	89	98
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	257,964	192,678
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	255,090	190,293
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	419	52
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	404	531
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,051	1,802
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	28,430	20,159
Commercial Real Estate [Member] | Construction [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	28,254	20,159
Commercial Real Estate [Member] | Construction [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Commercial Real Estate [Member] | Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	176	0
Consumer Loan [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	21,076	20,893
Consumer Loan [Member] | Home Equity [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	20,858	20,555
Consumer Loan [Member] | Home Equity [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	321
Consumer Loan [Member] | Home Equity [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	12
Consumer Loan [Member] | Home Equity [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	218	5
Consumer Loan [Member] | Consumer Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,790	4,350
Consumer Loan [Member] | Consumer Installment [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	4,770	4,340
Consumer Loan [Member] | Consumer Installment [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10	10
Consumer Loan [Member] | Consumer Installment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	0
Consumer Loan [Member] | Consumer Installment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	10	0
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	60,381	48,725
Commercial Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	59,030	47,598
Commercial Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	0	26
Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	60	8
Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 1,291	$ 1,093

Loans, Delinquent and Nonaccrua

Loans, Delinquent and Nonaccrual Loans by Past Due Status (Details) $ in Thousands	Jun. 30, 2017USD ($)Loan	Jun. 30, 2016USD ($)Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 6,285	$ 5,765
Current	628,046	525,525
Total loans	634,331	531,290
Loans on non-accrual	3,572	3,326
Loans in the process of foreclosure	1,600	1,500
Nonaccrual loans with recent history of delinquency greater than 90 days	1,900	1,900
Nonaccrual loans making payments pursuant to forbearance agreements	179
Accruing loans delinquent more than 90 days	69	77
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,422	2,347
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,143	1,873
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 1,720	$ 1,545
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans in the process of foreclosure | Loan	12	9
Loans in the process of foreclosure	$ 967	$ 867
Residential Real Estate [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,538	3,108
Current	241,793	231,884
Total loans	245,331	234,992
Loans on non-accrual	1,240	1,207
Residential Real Estate [Member] | Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,088	1,533
Residential Real Estate [Member] | Residential Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	515	637
Residential Real Estate [Member] | Residential Real Estate [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	935	938
Residential Real Estate [Member] | Construction and Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Current	7,160	5,575
Total loans	7,160	5,575
Loans on non-accrual	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Residential Real Estate [Member] | Construction and Land [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Residential Real Estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	47
Current	9,199	3,871
Total loans	9,199	3,918
Loans on non-accrual	0	0
Residential Real Estate [Member] | Multi-family [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	47
Residential Real Estate [Member] | Multi-family [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Residential Real Estate [Member] | Multi-family [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,684	1,707
Current	256,280	190,971
Total loans	257,964	192,678
Loans on non-accrual	1,452	1,899
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	74	324
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,070	793
Commercial Real Estate [Member] | Real Estate Mortgage [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	540	590
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	176	0
Current	28,254	20,159
Total loans	28,430	20,159
Loans on non-accrual	176	0
Commercial Real Estate [Member] | Construction [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Commercial Real Estate [Member] | Construction [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	176	0
Commercial Real Estate [Member] | Construction [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
Consumer Loan [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	439	355
Current	20,637	20,538
Total loans	21,076	20,893
Loans on non-accrual	218	18
Consumer Loan [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	220	17
Consumer Loan [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	186	321
Consumer Loan [Member] | Home Equity [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	33	17
Consumer Loan [Member] | Consumer Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	42	44
Current	4,748	4,306
Total loans	4,790	4,350
Loans on non-accrual	10	0
Consumer Loan [Member] | Consumer Installment [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	22	34
Consumer Loan [Member] | Consumer Installment [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	10	10
Consumer Loan [Member] | Consumer Installment [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	10	0
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	406	504
Current	59,975	48,221
Total loans	60,381	48,725
Loans on non-accrual	476	202
Commercial Loans [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	18	392
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	186	112
Commercial Loans [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 202	$ 0

Loans, Nonaccrual Loans, Intere

Loans, Nonaccrual Loans, Interest Income Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Loans [Abstract]
Interest income that would have been recorded if loans had been performing in accordance with original terms	$ 227	$ 247
Interest income that was recorded on nonaccrual loans	$ 148	$ 142

Loans, Impaired Loans By Loan P

Loans, Impaired Loans By Loan Portfolio Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
With no related allowance recorded [Abstract]
Recorded investment	$ 1,181	$ 1,295
Unpaid principal	1,181	1,502
Average recorded investment	1,055	1,376
Interest income recognized	50	35
With an allowance recorded [Abstract]
Recorded investment	2,071	1,947
Unpaid principal	2,071	1,947
Related allowance	436	330
Average recorded investment	2,280	1,987
Interest income recognized	87	87
Total impaired [Abstract]
Recorded investment	3,252	3,242
Unpaid principal	3,252	3,449
Related allowance	436	330
Average recorded investment	3,335	3,363
Interest income recognized	137	122
Residential Real Estate [Member] | Residential Real Estate [Member]
With no related allowance recorded [Abstract]
Recorded investment	0	266
Unpaid principal	0	266
Average recorded investment	176	243
Interest income recognized	0	5
With an allowance recorded [Abstract]
Recorded investment	1,455	1,457
Unpaid principal	1,455	1,457
Related allowance	278	267
Average recorded investment	1,302	1,411
Interest income recognized	51	57
Total impaired [Abstract]
Recorded investment	1,455	1,723
Unpaid principal	1,455	1,723
Related allowance	278	267
Average recorded investment	1,478	1,654
Interest income recognized	51	62
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
With no related allowance recorded [Abstract]
Recorded investment	809	1,024
Unpaid principal	809	1,231
Average recorded investment	704	1,085
Interest income recognized	33	29
With an allowance recorded [Abstract]
Recorded investment	440	405
Unpaid principal	440	405
Related allowance	135	61
Average recorded investment	922	487
Interest income recognized	34	25
Total impaired [Abstract]
Recorded investment	1,249	1,429
Unpaid principal	1,249	1,636
Related allowance	135	61
Average recorded investment	1,626	1,572
Interest income recognized	67	54
Commercial Real Estate [Member] | Construction [Member]
With an allowance recorded [Abstract]
Recorded investment	176
Unpaid principal	176
Related allowance	23
Average recorded investment	15
Interest income recognized	0
Total impaired [Abstract]
Recorded investment	176
Unpaid principal	176
Related allowance	23
Average recorded investment	15
Interest income recognized	0
Consumer Loan [Member] | Home Equity [Member]
With no related allowance recorded [Abstract]
Recorded investment	186	5
Unpaid principal	186	5
Average recorded investment	64	48
Interest income recognized	9	1
With an allowance recorded [Abstract]
Related allowance	0	0
Total impaired [Abstract]
Recorded investment	186	5
Unpaid principal	186	5
Related allowance	0	0
Average recorded investment	64	48
Interest income recognized	9	1
Commercial Loans [Member]
With no related allowance recorded [Abstract]
Recorded investment	186
Unpaid principal	186
Average recorded investment	111
Interest income recognized	8
With an allowance recorded [Abstract]
Recorded investment	0	85
Unpaid principal	0	85
Related allowance	0	2
Average recorded investment	41	89
Interest income recognized	2	5
Total impaired [Abstract]
Recorded investment	186	85
Unpaid principal	186	85
Related allowance	0	2
Average recorded investment	152	89
Interest income recognized	$ 10	$ 5

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructurings on Financing Receivables (Details) - Contract	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
TDR loans which have subsequently defaulted during the period	0	0

Loans, Activity and Allocation

Loans, Activity and Allocation of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	$ 9,485	$ 8,142
Charge-offs	465	427
Recoveries	91	97
Provision	1,911	1,673
Balance, end of period	11,022	9,485
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	436	330
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	10,586	9,155
Loans receivable, ending balance, impairment analysis individually evaluated	3,252	3,242
Loans receivable, ending balance, impairment analysis collectively evaluated	631,079	528,048
Residential Real Estate [Member] | Residential Real Estate [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	2,396	2,454
Charge-offs	90	0
Recoveries	0	0
Provision	(17)	(58)
Balance, end of period	2,289	2,396
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	278	267
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	2,011	2,129
Loans receivable, ending balance, impairment analysis individually evaluated	1,455	1,723
Loans receivable, ending balance, impairment analysis collectively evaluated	243,876	233,269
Residential Real Estate [Member] | Construction and Land [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	75	50
Charge-offs	0	0
Recoveries	0	0
Provision	14	25
Balance, end of period	89	75
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	89	75
Loans receivable, ending balance, impairment analysis individually evaluated	0	0
Loans receivable, ending balance, impairment analysis collectively evaluated	7,160	5,575
Residential Real Estate [Member] | Multi-family [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	22	40
Charge-offs	0	0
Recoveries	0	0
Provision	21	(18)
Balance, end of period	43	22
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	43	22
Loans receivable, ending balance, impairment analysis individually evaluated	0	0
Loans receivable, ending balance, impairment analysis collectively evaluated	9,199	3,918
Commercial Real Estate [Member] | Real Estate Mortgage [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	4,541	3,699
Charge-offs	39	162
Recoveries	0	17
Provision	1,087	987
Balance, end of period	5,589	4,541
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	135	61
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	5,454	4,480
Loans receivable, ending balance, impairment analysis individually evaluated	1,249	1,429
Loans receivable, ending balance, impairment analysis collectively evaluated	256,715	191,249
Commercial Real Estate [Member] | Construction [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	502	233
Charge-offs	0	0
Recoveries	0	0
Provision	185	269
Balance, end of period	687	502
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	23	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	664	502
Loans receivable, ending balance, impairment analysis individually evaluated	176	0
Loans receivable, ending balance, impairment analysis collectively evaluated	28,254	20,159
Consumer Loan [Member] | Home Equity [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	309	314
Charge-offs	0	0
Recoveries	0	0
Provision	(75)	(5)
Balance, end of period	234	309
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	234	309
Loans receivable, ending balance, impairment analysis individually evaluated	186	5
Loans receivable, ending balance, impairment analysis collectively evaluated	20,890	20,888
Consumer Loan [Member] | Consumer Installment [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	228	223
Charge-offs	270	245
Recoveries	88	78
Provision	185	172
Balance, end of period	231	228
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	231	228
Loans receivable, ending balance, impairment analysis individually evaluated	0	0
Loans receivable, ending balance, impairment analysis collectively evaluated	4,790	4,350
Commercial Loans [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	1,412	1,129
Charge-offs	66	20
Recoveries	3	2
Provision	331	301
Balance, end of period	1,680	1,412
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0	2
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	1,680	1,410
Loans receivable, ending balance, impairment analysis individually evaluated	186	85
Loans receivable, ending balance, impairment analysis collectively evaluated	60,195	48,640
Unallocated [Member]
Activity of allowance for loan losses by loan category [Roll Forward]
Balance, beginning of period	0
Charge-offs	0
Recoveries	0
Provision	180
Balance, end of period	180	$ 0
Allocation of allowance for loan losses by loan category [Abstract]
Allowance for loan losses, ending balance, impairment analysis individually evaluated	0
Allowance for loan losses, ending balance, impairment analysis collectively evaluated	180
Loans receivable, ending balance, impairment analysis individually evaluated	0
Loans receivable, ending balance, impairment analysis collectively evaluated	$ 0

Loans, Foreclosed Real Estate (

Loans, Foreclosed Real Estate (FRE) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Real Estate Properties [Line Items]
Foreclosed real estate	$ 799	$ 370
Residential Real Estate [Member]
Real Estate Properties [Line Items]
Foreclosed real estate	0	61
Land [Member]
Real Estate Properties [Line Items]
Foreclosed real estate	0	65
Commercial Real Estate [Member]
Real Estate Properties [Line Items]
Foreclosed real estate	$ 799	$ 244

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (9,370)	$ (8,732)
Total premises and equipment	13,615	14,176
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,883	2,883
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,822	15,792
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,280	$ 4,233

Deposits, Schedule of Deposits

Deposits, Schedule of Deposits (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016
Deposits [Abstract]
Noninterest-bearing deposits	$ 95,929,000	$ 88,254,000
Certificates of deposit	53,742,000	50,666,000
Savings deposits	197,288,000	177,309,000
Money market deposits	119,806,000	112,905,000
NOW deposits	392,770,000	309,753,000
Total deposits	859,535,000	738,887,000
Advance payments by borrowers for taxes and insurance	$ 7,172,000	$ 6,590,000

Deposits, Schedule of Deposit60

Deposits, Schedule of Deposits by Time Remaining on Maturity (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2016
Contractual maturities, certificates of deposit less than $100,000 [Abstract]
3 months or less	$ 20,468,000
3 to 6 months	4,618,000
7 to 12 months	4,326,000
Over 12 months	11,499,000
Total	40,911,000
Contractual maturities, certificate of deposit $100,000 or more [Abstract]
3 months or less	2,784,000
3 to 6 months	1,368,000
7 to 12 months	1,181,000
Over 12 months	7,498,000
Total	12,831,000
Contractual maturities, total certificate of deposits [Abstract]
3 months or less	23,252,000
3 to 6 months	5,986,000
7 to 12 months	5,507,000
Over 12 months	18,997,000
Total certificates of deposit	53,742,000
Certificates of deposit $250,000 or more	2,121,000	$ 2,824,000
Brokered certificates of deposit	$ 15,000,000

Deposits, Schedule of Certifica

Deposits, Schedule of Certificates of Deposits by Year of Maturity (Details) $ in Thousands	Jun. 30, 2017USD ($)
Scheduled maturities of certificates of deposit [Abstract]
2,018	$ 34,745
2,019	7,940
2,020	7,436
2,021	2,349
2,022	1,272
Total certificates of deposit	$ 53,742

Borrowings (Details)

Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Short-term or overnight borrowings from Federal Home Loan Bank	$ 6,900	$ 26,100
Available-for-sale securities pledged as collateral	2,800	4,200
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Loans pledged as collateral	256,100
Maximum amount of funding available	206,400
Total borrowings from Federal Home Loan Bank	29,600
Short-term or overnight borrowings from Federal Home Loan Bank	$ 6,900
Interest rate	1.28%
Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member] | Weighted Average [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Interest rate	1.60%
Weighted average maturity	28 months
Federal Reserve Bank [Member] | The Bank of Greene County [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Available-for-sale securities pledged as collateral	$ 2,800
Atlantic Central Bankers' Bank [Member]
Line of credit facility [Abstract]
Maximum borrowing capacity	5,000
Amount outstanding	0	0
Atlantic Central Bankers' Bank [Member] | The Bank of Greene County [Member]
Line of credit facility [Abstract]
Maximum borrowing capacity	6,000
Amount outstanding	0	0
Other Financial Institution [Member] | The Bank of Greene County [Member]
Line of credit facility [Abstract]
Maximum borrowing capacity	5,000
Amount outstanding	0	0
Standby Letters of Credit [Member] | Federal Home Loan Bank of New York [Member] | The Bank of Greene County [Member]
Line of credit facility [Abstract]
Amount outstanding	$ 0	$ 0

Borrowings, Scheduled Maturitie

Borrowings, Scheduled Maturities of Long-term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Scheduled maturities of long-term borrowings [Abstract]
2,018	$ 4,500
2,019	5,500
2,020	6,000
2,021	1,800
2,022	4,850
Total long-term borrowings	$ 22,650	$ 20,300

Accumulated Other Comprehensi64

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Loss [Abstract]
Unrealized gains on available-for-sale securities, net of tax	$ 612	$ 1,224
Unrealized loss on securities transferred to held-to-maturity, net of tax	0	(2)
Net losses and past service liability for defined benefit plan, net of tax	(1,604)	(1,947)
Accumulated other comprehensive loss	$ (992)	$ (725)

Employee Benefit Plans, Change

Employee Benefit Plans, Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Employee Benefit Plans [Abstract]
Required age to participate in defined Benefit Plan	21 years
Benefit obligation at beginning of year	$ 6,171	$ 5,457
Interest cost	215	232
Actuarial (gain) loss	(298)	695
Benefits paid	(221)	(213)
Benefit obligation at June 30	$ 5,867	$ 6,171

Employee Benefit Plans, Chang66

Employee Benefit Plans, Change in Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Employee Benefit Plans [Abstract]
Fair value of plan assets at beginning of year	$ 4,391	$ 4,481
Actual return on plan assets	312	123
Employer contributions	576	0
Benefits paid	(221)	(213)
Fair value of plan assets at June 30	5,058	4,391
Underfunded status at June 30 included in other liabilities	$ 809	$ 1,780

Employee Benefit Plans, Compone

Employee Benefit Plans, Components of Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 215	$ 232
Accumulated benefit obligation for the pension plan	5,900	6,200
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	215	232
Expected return on plan assets	(231)	(307)
Amortization of net loss	197	135
Net periodic pension cost	$ 181	$ 60

Employee Benefit Plans, Schedul

Employee Benefit Plans, Schedule of Amounts Recognized in Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Employee Benefit Plans [Abstract]
Actuarial gain (loss) on plan assets and benefit obligations	$ 576	$ (744)
Deferred tax (expense) benefit	(233)	288
Net change in plan assets and benefit obligations recognized in other comprehensive income	$ 343	$ (456)

Employee Benefit Plans, Sched69

Employee Benefit Plans, Schedule of Amounts Recognized in Financial Condition (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Other liabilities [Abstract]
Projected benefit obligation in excess of fair value of pension plan	$ 809	$ 1,780
Accumulated other comprehensive loss, net of taxes [Abstract]
Net losses and past service liability	$ (1,604)	$ (1,947)

Employee Benefit Plans, Sched70

Employee Benefit Plans, Schedule of Assumptions Used (Details)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Projected benefit obligation [Abstract]
Discount rate	3.81%	3.55%
Net periodic pension expense [Abstract]
Amortization period	12 years	13 years
Discount rate	3.55%	4.32%
Expected long-term rate of return on plan assets	5.00%	7.00%
Compensation rate for frozen plan	0.00%

Employee Benefit Plans, Sched71

Employee Benefit Plans, Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 5,058	$ 4,391	$ 4,481
Weighted-average plan asset allocation	100.00%	100.00%
Amount expected to be amortized from accumulated other comprehensive income in next fiscal year	$ 168
Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 0	$ 16
Weighted-average plan asset allocation	0.00%	0.40%
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 5,058	$ 4,375
Weighted-average plan asset allocation	100.00%	99.60%
Mutual Funds [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Allowable variation	5.00%
Large Cap Value Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for investment in mutual funds	20.00%
Short-term and Intermediate-term Fixed Income Bond Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for investment in mutual funds	80.00%

Employee Benefit Plans, Sched72

Employee Benefit Plans, Schedule of Expected Benefit Payments (Details) $ in Thousands	Jun. 30, 2017USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,018	$ 225
2,019	223
2,020	223
2,021	222
2,022	227
2023-2027	$ 1,209

Employee Benefit Plans, Defined

Employee Benefit Plans, Defined Contribution Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Defined Contribution Plan Disclosure [Line Items]
Required service period to participate in Defined Contribution Plan	3 months
Equal matching of employer contribution dollar for dollar	3.00%
Percentage of employer contribution for next 3%	50.00%
Company contributions associated with the contribution plan	$ 255	$ 246
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of compensation allowed to be contributed by employees on pre-tax basis	50.00%

Employee Benefit Plans, Employe

Employee Benefit Plans, Employee Stock Ownership Plan ("ESOP") (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Payment authorized for purchase of additional shares for ESOP	$ 110	$ 100
ESOP expense	$ 113	$ 84
Employee Stock Ownership Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Award vesting period	3 years

Employee Benefit Plans, Supplem

Employee Benefit Plans, Supplemental Executive Retirement Plan (Details) - Supplemental Executive Retirement Plan [Member] $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Installment	Jun. 30, 2016USD ($)
Defined Benefit Plan Disclosure [Line Items]
Vesting period	10 years
Period in which lump sum benefit will be paid in the event of death, disability or termination	2 years
Number of annual installments in which benefit will be paid | Installment	10
Net periodic pension costs	$ 509	$ 398
Postemployment benefits liability	$ 2,900	$ 2,000
Deferred Base Salary [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution per employee	50.00%
Deferred Annual Bonus [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution per employee	100.00%

Stock-Based Compensation (Detai

Stock-Based Compensation (Details)	Mar. 15, 2016	Jun. 30, 2017USD ($)Plan$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares	Dec. 31, 2008$ / sharesshares
Share-based compensation arrangement by share-based payment award [Line Items]
Number of stock-based compensation plans | Plan		2
Stock split ratio	2		2
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized | $		$ 0	$ 0
Stock option activity, weighted average exercise price per share [Abstract]
Options outstanding, intrinsic value | $		791,000	649,000
Options exercisable, intrinsic value | $		791,000	649,000
Options exercised during period, total intrinsic value | $		$ 339,000	$ 339,000
Options granted (in shares)		0	0
Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)		64,770	95,670
Exercised (in shares)		(27,000)	(30,900)
Outstanding at year end (in shares)		37,770	64,770
Exercisable at year end (in shares)		37,770	64,770
Stock option activity, weighted average exercise price per share [Abstract]
Outstanding at beginning of year (in dollars per share) | $ / shares		$ 6.25	$ 6.25
Exercised (in dollars per share) | $ / shares		6.25	6.25
Outstanding at year end (in dollars per share) | $ / shares		6.25	6.25
Exercisable at year end (in dollars per share) | $ / shares		$ 6.25	$ 6.25
2008 Stock Option Plan [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Number of shares authorized under the plan (in shares)		360,000
Options, exercise price (in dollars per share) | $ / shares				$ 6.25
Options, expected term		10 years
Award vesting period		3 years
Stock option activity, weighted average exercise price per share [Abstract]
Options granted (in shares)				329,000

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Options Outstanding and Exercisable (Details) - $6.25 [Member]	12 Months Ended
	Jun. 30, 2017$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Upper Range Limit (in dollars per share)	$ 6.25
Range of exercise prices, lower range limit (in dollars per share)	$ 6.25
Number Outstanding (in shares) | shares	37,770
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 3 months
Options outstanding, weighted average exercise price (in dollars per share)	$ 6.25
Options exercisable, weighted average remaining contractual life	1 year 3 months
Options exercisable, weighted average exercise price (in dollars per share)	$ 6.25

Stock-Based Compensation, Phant

Stock-Based Compensation, Phantom Stock Option Plan and Long-term Incentive Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Stock option activity, shares [Roll Forward]
Options granted (in shares)	0	0
Phantom Stock Option [Member]
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)	64,770	95,670
Outstanding at year end (in shares)	37,770	64,770
2011 Phantom Stock Option and Long-term Incentive Plan [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Number of shares authorized under the plan (in shares)	3,600,000	3,600,000
Number of options granted to date (in shares)	2,972,982	2,394,782
Stock option activity, shares [Roll Forward]
Outstanding at beginning of year (in shares)	1,352,554	1,257,508
Options granted (in shares)	578,200	493,760
Options forfeited (in shares)	0	(2,000)
Options paid in cash upon vesting (in shares)	(408,034)	(396,714)
Outstanding at year end (in shares)	1,522,720	1,352,554
Stock option related information [Abstract]
Cash paid out on options vested	$ 845	$ 711
Compensation expense recognized	1,448	1,013
Total liability for long-term incentive plan	$ 2,000	$ 1,400
2011 Phantom Stock Option and Long-term Incentive Plan [Member] | Minimum [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Strike price of phantom stock options as percent of book value	100.00%

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Antidilutive securities or contracts outstanding (in shares)	0	0
Net Income	$ 11,187	$ 8,963
Weighted Average Shares - Basic (in shares)	8,495,022	8,459,327
Effect of Dilutive Stock Options (in shares)	18,107	16,965
Weighted Average Shares - Dilute (in shares)	8,513,129	8,476,292
Earnings per share, Basic (in dollars per share)	$ 1.32	$ 1.06
Earnings per share, Diluted (in dollars per share)	$ 1.31	$ 1.06

Income Taxes, Provision for Inc

Income Taxes, Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Current expense [Abstract]
Federal	$ 3,591	$ 3,137
State	409	256
Total current expense	4,000	3,393
Deferred benefit	(259)	(714)
Total provision for income taxes	$ 3,741	$ 2,679

Income Taxes, Effective Tax Rat

Income Taxes, Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Income Taxes [Abstract]
Tax based on federal statutory rate	34.00%	34.00%
State income taxes, net of federal benefit	0.89%	0.75%
Tax-exempt income	(8.20%)	(9.05%)
Captive insurance premium income	(2.28%)	(2.95%)
Other, net	0.55%	0.26%
Total income tax expense	24.96%	23.01%

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Deferred tax assets [Abstract]
Allowance for loan losses	$ 4,220	$ 3,669
Pension benefits	310	689
Other benefit plans	1,957	1,137
Total deferred tax assets	6,487	5,495
Deferred tax liabilities [Abstract]
Depreciation	1,392	1,346
Loan costs	1,051	894
Real estate investment trust income	3,052	2,283
Unrealized gains on securities	379	771
Other	224	225
Total deferred tax liabilities	6,098	5,519
Net deferred tax asset included in prepaid expenses and other assets	389
Net deferred tax liability included in other liabilities		(24)
Income Tax Contingency [Line Items]
Uncertain tax positions	$ 0	$ 0
Federal [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2,014
Federal [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2,016
New York State [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2,015
New York State [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year	2,016

Commitments and Contingent Li83

Commitments and Contingent Liabilities (Details) - The Bank of Greene County [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	$ 92,522	$ 72,019
Unfunded Loan Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	41,082	41,383
Unused Lines of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments	$ 51,440	$ 30,636

Operating Leases (Details)

Operating Leases (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2017USD ($)Branch	Jun. 30, 2016USD ($)
Operating Leases [Abstract]
Number of branches for non-cancelable lease commitment | Branch	4
Total lease expense	$ 156	$ 152
Non-Cancelable lease commitments [Abstract]
2,018	159
2,019	100
2,020	81
2,021	73
2,022	30
Thereafter	$ 0

Fair Value Measurements and F85

Fair Value Measurements and Fair Value of Financial Instruments, Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Assets [Abstract]
Securities available-for-sale	$ 91,483	$ 100,123
Recurring [Member]
Assets [Abstract]
Securities available-for-sale	91,483	100,123
Recurring [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	4,717	4,891
Recurring [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	58,112	60,499
Recurring [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	4,913	6,540
Recurring [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	20,765	23,879
Recurring [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale	1	5
Recurring [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	2,791	4,157
Recurring [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	184	152
Recurring [Member] | Level 1 [Member]
Assets [Abstract]
Securities available-for-sale	2,976	4,314
Recurring [Member] | Level 1 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale	1	5
Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	2,791	4,157
Recurring [Member] | Level 1 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	184	152
Recurring [Member] | Level 2 [Member]
Assets [Abstract]
Securities available-for-sale	88,507	95,809
Recurring [Member] | Level 2 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	4,717	4,891
Recurring [Member] | Level 2 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	58,112	60,499
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	4,913	6,540
Recurring [Member] | Level 2 [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	20,765	23,879
Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 2 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | U.S. Government Sponsored Enterprises [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | State and Political Subdivisions [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities-residential [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Mortgage-backed Securities-multi-family [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]
Assets [Abstract]
Securities available-for-sale	0	0
Recurring [Member] | Level 3 [Member] | Equity Securities [Member]
Assets [Abstract]
Securities available-for-sale	$ 0	$ 0

Fair Value Measurements and F86

Fair Value Measurements and Fair Value of Financial Instruments, Fair Value, Assets and Liabilities Measured on Nonrecurring Basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recorded investment	$ 1,175	$ 655
Related allowance	330	164
Fair value	845	491
Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recorded investment	799	370
Related allowance	0	0
Fair value	799	370
Level 1 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Level 1 [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Level 2 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Level 2 [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	0	0
Level 3 [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	845	491
Level 3 [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 799	$ 370

Fair Value Measurements and F87

Fair Value Measurements and Fair Value of Financial Instruments, Fair Value Inputs, Assets, Quantitative Information (Details) - Nonrecurring [Member] - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 845	$ 491
Foreclosed Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		799	370
Appraisal of Collateral [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[1]	$ 845	$ 491
Appraisal of Collateral [Member] | Impaired Loans [Member] | Minimum [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	25.00%	0.00%
Liquidation expenses	[1],[3]	3.45%	0.00%
Appraisal of Collateral [Member] | Impaired Loans [Member] | Maximum [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	42.52%	38.85%
Liquidation expenses	[1],[3]	7.38%	8.35%
Appraisal of Collateral [Member] | Impaired Loans [Member] | Weighted Average [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	28.46%	21.01%
Liquidation expenses	[1],[3]	5.93%	4.92%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	[1]	$ 799	$ 370
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Minimum [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	0.00%	0.00%
Liquidation expenses	[1],[3]	11.64%	0.42%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Maximum [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	0.00%	54.17%
Liquidation expenses	[1],[3]	17.92%	12.67%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]
Fair value inputs [Abstract]
Appraisal adjustments	[1],[2]	0.00%	8.83%
Liquidation expenses	[1],[3]	16.29%	7.81%
[1]	Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable.
[2]	Appraisals may be adjusted downwards by management for qualitative factors such as economic conditions. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received or age of the appraisal.
[3]	Appraisals may be adjusted downwards by management for items such as the estimated costs to liquidate the collateral.

Fair Value Measurements and F88

Fair Value Measurements and Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 91,483	$ 100,123
Securities held-to-maturity	228,452	214,058
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16,277	15,895
Long term certificate of deposit	2,145	2,210
Securities available-for-sale	91,483	100,123
Securities held-to-maturity	223,830	204,935
Federal Home Loan Bank stock	2,131	2,752
Net loans receivable	624,187	522,764
Accrued interest receivable	4,033	3,610
Deposits	859,535	738,887
Borrowings from Federal Home Loan Bank	29,550	46,400
Accrued interest payable	92	74
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16,277	15,895
Long term certificate of deposit	2,145	2,210
Securities available-for-sale	91,483	100,123
Securities held-to-maturity	228,452	214,058
Federal Home Loan Bank stock	2,131	2,752
Net loans receivable	629,690	533,721
Accrued interest receivable	4,033	3,610
Deposits	859,715	739,087
Borrowings from Federal Home Loan Bank	29,411	46,562
Accrued interest payable	92	74
Fair Value [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16,277	15,895
Long term certificate of deposit	2,145	2,210
Securities available-for-sale	2,976	4,314
Securities held-to-maturity	0	0
Federal Home Loan Bank stock	0	0
Net loans receivable	0	0
Accrued interest receivable	0	0
Deposits	0	0
Borrowings from Federal Home Loan Bank	0	0
Accrued interest payable	0	0
Fair Value [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Long term certificate of deposit	0	0
Securities available-for-sale	88,507	95,809
Securities held-to-maturity	228,452	214,058
Federal Home Loan Bank stock	2,131	2,752
Net loans receivable	0	0
Accrued interest receivable	4,033	3,610
Deposits	859,715	739,087
Borrowings from Federal Home Loan Bank	29,411	46,562
Accrued interest payable	92	74
Fair Value [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Long term certificate of deposit	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Federal Home Loan Bank stock	0	0
Net loans receivable	629,690	533,721
Accrued interest receivable	0	0
Deposits	0	0
Borrowings from Federal Home Loan Bank	0	0
Accrued interest payable	$ 0	$ 0

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
The Bank of Greene County [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, actual amount	$ 87,719	$ 76,666
Total risk-based capital, actual ratio	15.80%	16.30%
Total risk-based capital for capital adequacy purposes, amount	$ 44,433	$ 37,577
Total risk-based capital for capital adequacy purposes, ratio	8.00%	8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 55,542	$ 46,972
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00%	10.00%
Total risk-based capital for capital conservation buffer, actual	7.794%	8.322%
Total risk-based capital for capital conservation buffer, required	1.25%	0.625%
Tier 1 risk-based capital, actual amount	$ 80,671	$ 70,709
Tier 1 risk-based capital, actual ratio	14.50%	15.10%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 33,325	$ 28,183
Tier 1 risk-based capital for capital adequacy purposes, ratio	6.00%	6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 44,433	$ 37,577
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00%	8.00%
Tier 1 risk-based capital for capital conservation buffer, actual	8.525%	9.054%
Tier 1 risk-based capital for capital conservation buffer, required	1.25%	0.625%
Common equity tier 1 capital, actual amount	$ 80,671	$ 70,709
Common equity tier 1 capital, actual ratio	14.50%	15.10%
Common equity tier 1 capital for capital adequacy purposes, amount	$ 24,994	$ 21,137
Common equity tier 1 capital for capital adequacy purposes, ratio	4.50%	4.50%
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, amount	$ 36,102	$ 30,532
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Common equity tier 1 capital for capital conservation buffer, actual	10.024%	10.554%
Common equity tier 1 capital for capital conservation buffer, required	1.25%	0.625%
Tier 1 leverage ratio, actual amount	$ 80,671	$ 70,709
Tier 1 leverage ratio, actual ratio	8.50%	8.40%
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 38,056	$ 33,815
Tier 1 leverage ratio for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 47,571	$ 42,268
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	5.00%	5.00%
Tier 1 leverage ratio for capital conservation buffer, actual	4.479%	4.364%
Tier 1 leverage ratio for capital conservation buffer, required	1.25%	0.625%
Greene County Commercial Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, actual amount	$ 30,095	$ 23,065
Total risk-based capital, actual ratio	40.10%	40.80%
Total risk-based capital for capital adequacy purposes, amount	$ 6,011	$ 4,518
Total risk-based capital for capital adequacy purposes, ratio	8.00%	8.00%
Total risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 7,514	$ 5,648
Total risk-based capital to be well capitalized under prompt corrective action provisions, ratio	10.00%	10.00%
Total risk-based capital for capital conservation buffer, actual	32.053%	32.84%
Total risk-based capital for capital conservation buffer, required	1.25%	0.625%
Tier 1 risk-based capital, actual amount	$ 30,095	$ 23,065
Tier 1 risk-based capital, actual ratio	40.10%	40.80%
Tier 1 risk-based capital for capital adequacy purposes, amount	$ 4,508	$ 3,389
Tier 1 risk-based capital for capital adequacy purposes, ratio	6.00%	6.00%
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, amount	$ 6,011	$ 4,518
Tier 1 risk-based capital to be well capitalized under prompt corrective action provisions, ratio	8.00%	8.00%
Tier 1 risk-based capital for capital conservation buffer, actual	34.053%	34.84%
Tier 1 risk-based capital for capital conservation buffer, required	1.25%	0.625%
Common equity tier 1 capital, actual amount	$ 30,095	$ 23,065
Common equity tier 1 capital, actual ratio	40.10%	40.80%
Common equity tier 1 capital for capital adequacy purposes, amount	$ 3,381	$ 2,541
Common equity tier 1 capital for capital adequacy purposes, ratio	4.50%	4.50%
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, amount	$ 4,884	$ 3,671
Common equity tier 1 capital to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Common equity tier 1 capital for capital conservation buffer, actual	35.55%	36.34%
Common equity tier 1 capital for capital conservation buffer, required	1.25%	0.625%
Tier 1 leverage ratio, actual amount	$ 30,095	$ 23,065
Tier 1 leverage ratio, actual ratio	9.62%	8.10%
Tier 1 leverage ratio for capital adequacy purposes, amount	$ 12,508	$ 11,409
Tier 1 leverage ratio for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, amount	$ 15,635	$ 14,262
Tier 1 leverage ratio to be well capitalized under prompt corrective action provisions, ratio	5.00%	5.00%
Tier 1 leverage ratio for capital conservation buffer, actual	5.624%	4.086%
Tier 1 leverage ratio for capital conservation buffer, required	1.25%	0.625%

Condensed Financial Statement90

Condensed Financial Statements of Greene County Bancorp, Inc., Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
ASSETS [Abstract]
Total assets	$ 982,291	$ 868,781
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Total liabilities	898,770	794,480
Total shareholders' equity	83,521	74,301	$ 66,920
Total liabilities and shareholders' equity	982,291	868,781
Parent Company [Member]
ASSETS [Abstract]
Cash and cash equivalents	2,015	2,641	$ 544
Investment in subsidiaries	81,540	71,723
Prepaid expenses and other assets	53	48
Total assets	83,608	74,412
LIABILITIES AND SHAREHOLDERS' EQUITY [Abstract]
Total liabilities	87	111
Total shareholders' equity	83,521	74,301
Total liabilities and shareholders' equity	$ 83,608	$ 74,412

Condensed Financial Statement91

Condensed Financial Statements of Greene County Bancorp, Inc., Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING EXPENSES [Abstract]
Other	$ 2,038	$ 2,244
Net income	11,187	8,963
Parent Company [Member]
INCOME [Abstract]
Equity in undistributed net income of subsidiaries	9,484	5,239
Dividend distributed by subsidiary	1,904	4,004
Interest-earning deposits	6	6
Total Income	11,394	9,249
OPERATING EXPENSES [Abstract]
Legal fees	46	66
Other	161	220
Total operating expenses	207	286
Net income	$ 11,187	$ 8,963

Condensed Financial Statement92

Condensed Financial Statements of Greene County Bancorp, Inc., Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 11,187	$ 8,963
Other comprehensive income [Abstract]
Unrealized holding (losses) gains on available-for-sale securities, net of income tax (benefit) expense of ($392) and $328, respectively	(612)	520
Accretion of unrealized loss on securities transferred to held-to-maturity, net of income taxes of $1 and $6, respectively	2	9
Pension actuarial gain (loss), net of income tax expense (benefit) of $158 and ($340)	221	(539)
Amortization of pension actuarial losses recognized in salaries and benefits, net of income taxes of $75 and $52, respectively	122	83
Total other comprehensive (loss) income net of taxes	(267)	73
Comprehensive income	10,920	9,036
Unrealized holding (losses) gains on available-for-sale securities, income tax (benefit) expense	(392)	328
Accretion of unrealized loss on securities transferred to held-to-maturity, income taxes	1	6
Pension actuarial gain (loss), income tax expense (benefit)	158	(340)
Amortization of pension actuarial losses recognized in salaries and benefits, income taxes	75	52
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	11,187	8,963
Other comprehensive income [Abstract]
Unrealized holding (losses) gains on available-for-sale securities, net of income tax (benefit) expense of ($392) and $328, respectively	(612)	520
Accretion of unrealized loss on securities transferred to held-to-maturity, net of income taxes of $1 and $6, respectively	2	9
Pension actuarial gain (loss), net of income tax expense (benefit) of $158 and ($340)	221	(539)
Amortization of pension actuarial losses recognized in salaries and benefits, net of income taxes of $75 and $52, respectively	122	83
Total other comprehensive (loss) income net of taxes	(267)	73
Comprehensive income	10,920	9,036
Unrealized holding (losses) gains on available-for-sale securities, income tax (benefit) expense	(392)	328
Accretion of unrealized loss on securities transferred to held-to-maturity, income taxes	1	6
Pension actuarial gain (loss), income tax expense (benefit)	158	(340)
Amortization of pension actuarial losses recognized in salaries and benefits, income taxes	$ 75	$ 52

Condensed Financial Statement93

Condensed Financial Statements of Greene County Bancorp, Inc., Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities [Abstract]
Net Income	$ 11,187	$ 8,963
Adjustments to reconcile net income to cash provided by operating activities:
Tax benefit of stock based compensation	(51)	(6)
Net increase in prepaid expenses and other assets	158	202
Net cash provided by operating activities	14,048	13,581
Cash flows from Investing Activities [Abstract]
Net cash used in investing activities	(115,764)	(132,439)
Cash flows from financing activities [Abstract]
Payment of cash dividends	(1,920)	(1,854)
Excess tax benefit from share-based payment arrangements	51	6
Net cash provided by financing activities	102,098	119,215
Net increase in cash and cash equivalents	382	357
Parent Company [Member]
Cash flows from operating activities [Abstract]
Net Income	11,187	8,963
Adjustments to reconcile net income to cash provided by operating activities:
Undistributed earnings of subsidiaries	(9,484)	(5,239)
Tax benefit of stock based compensation	(51)	(6)
Net increase in prepaid expenses and other assets	(5)	(27)
Net increase in total liabilities	27	61
Net cash provided by operating activities	1,674	3,752
Cash flows from Investing Activities [Abstract]
Investment in subsidiary	(600)	0
Net cash used in investing activities	(600)	0
Cash flows from financing activities [Abstract]
Payment of cash dividends	(1,920)	(1,854)
Proceeds from exercise of stock options	169	193
Excess tax benefit from share-based payment arrangements	51	6
Net cash provided by financing activities	(1,700)	(1,655)
Net increase in cash and cash equivalents	(626)	2,097
Cash and cash equivalents at beginning of year	2,641	544
Cash and cash equivalents at end of year	$ 2,015	$ 2,641

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Jul. 18, 2017	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Common stock, dividends declared (in dollars per share)		$ 0.38	$ 0.37
2016 Annual Dividend [Member]
Subsequent Event [Line Items]
Common stock, dividends declared (in dollars per share)		$ 0.38
Subsequent Event [Member] | 2017 Q4 Dividend [Member]
Subsequent Event [Line Items]
Common stock, dividends declared (in dollars per share)	$ 0.0975
Percentage of increase in cash dividend rate	2.60%
Dividends payable, date of record	Aug. 15, 2017
Dividends payable, date paid	Aug. 31, 2017
Dividends payable, date declared	Jun. 30, 2017
Subsequent Event [Member] | 2017 Annual Dividend [Member]
Subsequent Event [Line Items]
Common stock, dividends declared (in dollars per share)	$ 0.39