PCSB Financial (PCSB) 10-Q 11 May 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Mar. 31, 2018	May 11, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	PCSB
Entity Registrant Name	PCSB Financial Corp
Entity Central Index Key	1,691,337
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		18,165,110

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
ASSETS
Cash and due from banks	$ 35,307	$ 59,115
Federal funds sold	1,198	1,371
Total cash and cash equivalents	36,505	60,486
Investment securities:
Held to maturity investment securities, at amortized cost (fair value of $357,761 and $383,588, respectively)	366,362	383,551
Available for sale securities, at fair value	107,321	111,889
Total investment securities	473,683	495,440
Loans receivable, net of allowance for loan losses of $4,624 and $5,150, respectively	886,718	809,648
Accrued interest receivable	4,458	3,693
Federal Home Loan Bank stock	4,112	3,132
Premises and equipment, net	12,522	12,959
Deferred tax asset, net	2,832	4,770
Foreclosed real estate	142	977
Bank-owned life insurance	23,609	23,179
Goodwill	6,106	6,106
Other intangible assets	463	559
Other assets	5,819	5,509
Total assets	1,456,969	1,426,458
LIABILITIES AND SHAREHOLDERS' EQUITY
Interest bearing deposits	960,666	952,109
Non-interest bearing deposits	127,319	136,352
Total deposits	1,087,985	1,088,461
Mortgage escrow funds	7,596	8,084
Advances from Federal Home Loan Bank	68,872	42,598
Other liabilities	7,856	7,469
Total liabilities	1,172,309	1,146,612
Commitments and contingencies
Preferred stock ($0.01 par value, 10,000,000 shares authorized, no shares issued or outstanding as of March 31, 2018 and June 30, 2017)
Common stock ($0.01 par value, 200,000,000 shares authorized, 18,165,110 shares issued and outstanding as of March 31, 2018 and June 30, 2017)	182	182
Additional paid in capital	178,795	177,993
Retained earnings	126,200	121,148
Unallocated common stock of Employee Stock Ownership Plan ("ESOP")	(13,324)	(14,262)
Accumulated other comprehensive loss, net of income taxes	(7,193)	(5,215)
Total shareholders' equity	284,660	279,846
Total liabilities and shareholders' equity	$ 1,456,969	$ 1,426,458

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Held to maturity investment securities, fair value	$ 357,761	$ 383,588
Allowance for loan losses	$ 4,624	$ 5,150
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares, issued	18,165,110	18,165,110
Common Stock, shares outstanding	18,165,110	18,165,110

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income
Loans receivable	$ 9,103,000	$ 8,493,000	$ 27,092,000	$ 25,256,000
Investment securities	2,368,000	1,633,000	6,882,000	4,643,000
Federal funds and other	177,000	150,000	628,000	336,000
Total interest and dividend income	11,648,000	10,276,000	34,602,000	30,235,000
Interest expense
Deposits	1,380,000	1,263,000	3,954,000	3,839,000
FHLB advances	125,000	55,000	443,000	136,000
Total interest expense	1,505,000	1,318,000	4,397,000	3,975,000
Net interest income	10,143,000	8,958,000	30,205,000	26,260,000
Provision for loan losses	54,000	235,000	389,000	823,000
Net interest income after provision for loan losses	10,089,000	8,723,000	29,816,000	25,437,000
Noninterest income
Fees and service charges	241,000	353,000	810,000	955,000
Gain on sale of securities, net		0	173,000	0
Bank-owned life insurance	136,000	146,000	430,000	474,000
Settlement on acquired loan				1,615,000
Other	135,000	127,000	505,000	393,000
Total noninterest income	512,000	626,000	1,918,000	3,437,000
Noninterest expense
Salaries and employee benefits	4,755,000	3,495,000	14,391,000	12,189,000
Occupancy and equipment	1,326,000	1,362,000	3,904,000	4,497,000
Professional fees	465,000	273,000	1,257,000	858,000
Advertising	112,000	135,000	456,000	364,000
Postage, printing, stationary and supplies	161,000	140,000	435,000	404,000
FDIC assessment	93,000	160,000	235,000	481,000
Amortization of intangible assets	32,000	36,000	97,000	109,000
Other operating expenses	889,000	979,000	3,077,000	2,670,000
Total noninterest expense	7,833,000	6,580,000	23,852,000	21,572,000
Net income before income tax expense	2,768,000	2,769,000	7,882,000	7,302,000
Income tax expense	591,000	878,000	3,947,000	2,283,000
Net income	$ 2,177,000	$ 1,891,000	$ 3,935,000	$ 5,019,000
Earnings per common share:
Basic	$ 0.13		$ 0.23
Diluted	$ 0.13		$ 0.23
Weighted average common shares outstanding - basic and diluted	16,820,726		16,789,131

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net Income	$ 2,177	$ 1,891	$ 3,935	$ 5,019
Unrealized gains (losses) on available for sale securities:
Net change in unrealized gains/losses before reclassification adjustment	(705)	319	(1,635)	(790)
Reclassification adjustment for gains realized in net income			(139)
Net change in unrealized gains/losses	(705)	319	(1,774)	(790)
Tax effect	149	(109)	512	268
Net of tax	(556)	210	(1,262)	(522)
Defined benefit pension plan and supplemental retirement plans:
Total other comprehensive (loss) income	(406)	2,622	(861)	2,302
Comprehensive income	1,771	4,513	3,074	7,321
Pension Benefits [Member]
Defined benefit pension plan and supplemental retirement plans:
Net gain (loss) arising during the period		4,357		4,357
Reclassification adjustment for amortization of prior service cost and net gain (loss) included in net periodic pension cost	182	(727)	544	(149)
Tax effect	(39)	(1,233)	(162)	(1,430)
Net of tax	143	2,397	382	2,778
SERP Benefits [Member]
Defined benefit pension plan and supplemental retirement plans:
Reclassification adjustment for amortization of prior service cost and net gain (loss) included in net periodic pension cost	10	24	26	70
Tax effect	(3)	(9)	(7)	(24)
Net of tax	$ 7	$ 15	$ 19	$ 46

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Unallocated Common Stock of ESOP [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Jun. 30, 2016		$ 109,949			$ 117,919		$ (7,970)
Net Income		5,019			5,019
Other comprehensive loss		2,302					2,302
Ending Balance at Mar. 31, 2017		117,270			122,938		(5,668)
Beginning Balance at Dec. 31, 2016							(8,290)
Net Income		1,891
Other comprehensive loss		2,622					2,622
Ending Balance at Mar. 31, 2017		117,270			122,938		(5,668)
Beginning Balance at Jun. 30, 2017		279,846	$ 182	$ 177,993	121,148	$ (14,262)	(5,215)
Beginning Balance (in shares) at Jun. 30, 2017			18,165,110
Net Income		3,935			3,935
Other comprehensive loss		(861)					(861)
Reclassification of certain tax effects on other comprehensive income	[1]				1,117		(1,117)
Issuance of common stock	[2]	(17)		(17)
ESOP shares committed to be released (93,794 shares)		1,757		819		938
Ending Balance at Mar. 31, 2018		284,660	$ 182	178,795	126,200	(13,324)	(7,193)
Ending Balance (in shares) at Mar. 31, 2018			18,165,110
Beginning Balance at Dec. 31, 2017							(5,670)
Net Income		2,177
Other comprehensive loss		(406)					(406)
Reclassification of certain tax effects on other comprehensive income							(1,117)
Ending Balance at Mar. 31, 2018		$ 284,660	$ 182	$ 178,795	$ 126,200	$ (13,324)	$ (7,193)
Ending Balance (in shares) at Mar. 31, 2018			18,165,110
[1]	The adoption of ASU 2018-02 requires the reclassification from accumulated other comprehensive income to retained earnings of certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017. Refer to Footnote 2 - Recent Accounting Pronouncements for additional information
[2]	Represents costs incurred in association with the Company's initial public offering completed in the prior period.

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	9 Months Ended
	Mar. 31, 2018shares
Statement Of Stockholders Equity [Abstract]
ESOP shares committed to be released (in shares)	93,794

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net Income	$ 3,935,000	$ 5,019,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	389,000	823,000
Depreciation and amortization	1,110,000	1,065,000
Amortization of net premiums on securities and net deferred loan origination costs	1,293,000	681,000
Net increase in accrued interest receivable	(765,000)	(103,000)
Net loss on sale of foreclosed real estate	7,000	5,000
Net gains on sales of securities	(173,000)	0
Write-downs on other real estate owned	13,000
ESOP Compensation	1,757,000	0
Earnings from cash surrender value of BOLI	(430,000)	(474,000)
Net accretion of purchase account adjustments	(464,000)	(651,000)
Other adjustments, principally net changes in other assets and liabilities	2,928,000	(3,841,000)
Net cash provided by operating activities	9,600,000	2,524,000
Purchases of investment securities:
Held to maturity	(43,055,000)	(78,589,000)
Available for sale	(23,537,000)	(18,222,000)
Sales of investment securities available for sale	6,100,000
Maturities and calls of investment securities:
Held to maturity	59,772,000	56,808,000
Available for sale	20,107,000	30,295,000
Principal repayments net of disbursement for loan originations	10,724,000	15,507,000
Purchase of loans	(88,605,000)	(12,069,000)
Net redemption of FHLB stock	(980,000)	(196,000)
Purchase of bank premises and equipment	(577,000)	(2,382,000)
Proceeds from sale of foreclosed real estate	1,160,000	939,000
Net cash used in investing activities	(58,891,000)	(7,909,000)
FINANCING ACTIVITIES
Net (decrease) increase in deposits	(459,000)	1,890,000
Net increase in short-term FHLB advances	26,364,000	20,454,000
Repayment of long-term FHLB advances	(90,000)	(16,089,000)
Net decrease in mortgage escrow funds	(488,000)	(291,000)
Issuance of common stock	(17,000)	136,252,000
Net cash provided by financing activities	25,310,000	142,216,000
Net (decrease) increase in cash and cash equivalents	(23,981,000)	136,831,000
Cash and cash equivalents:
Cash and cash equivalents at beginning of period	60,486,000	41,578,000
Cash and cash equivalents at end of period	36,505,000	178,409,000
Cash paid for:
Interest	4,354,000	3,974,000
Income taxes	2,066,000	223,000
Loans transferred to foreclosed real estate and other assets	$ 345,000	$ 1,762,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Note 1. Basis of Presentation Nature of Operations PCSB Bank is a community-oriented financial institution that provides financial services to individuals and businesses within its market area of Putnam, Southern Dutchess, Rockland and Westchester Counties in New York. The Bank is a state-chartered stock savings bank and its deposits are insured up to applicable limits by the Deposit Insurance Fund of the Federal Deposit Insurance Corporation (“FDIC”). The Bank’s primary regulators are the FDIC and the New York State Department of Financial Services. Basis of Presentation The unaudited consolidated financial statements contained herein reflect all normal recurring adjustments that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented. Such adjustments are the only adjustments reflected in the consolidated financial statements contained herein. The annualized results of operations for the period presented are not necessarily indicative of the results of operations that may be expected for the entire fiscal year. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. The accompanying unaudited financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended June 30, 2017, included in the Company's annual report on Form 10-K. Use of Estimates

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Mar. 31, 2018
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	Note 2 . Recent Accounting Pronouncements The pronouncements discussed below are not intended to be an all-inclusive list, but rather only those pronouncements that could potentially have a material impact on our financial position, results of operations or disclosures. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09 “Revenue from Contracts with Customers.”, and was later amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-12 and 2016-20. These updates provide a comprehensive framework for addressing revenue recognition issues that can be applied to all contracts with customers. The amendments also include improved disclosures to enable users of financial statements to better understand the nature, amount, timing and uncertainty of revenue that is recognized. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2018, including interim periods within that fiscal year. ASU 2014-09 is not expected to have a material impact on the Company’s consolidated financial position or results of operations. The impact on disclosures is currently being evaluated by management. While the guidance in ASU 2014-09 supersedes most existing industry-specific revenue recognition accounting guidance, much of PCSB Bank’s revenue comes from financial instruments such as debt securities and loans that are outside the scope of the guidance. The Company’s material revenue streams that will be in the scope of ASU 2014-09 are fees on deposit accounts (including interchange fees) and foreclosed real estate gains and losses. All other revenue streams are immaterial or are in the scope of other GAAP requirements which take precedence and therefore are not in the scope of ASU 2014-09. Based on the Company’s analysis, ASU 2014-09 will not materially change the recognition of revenue on service fees on deposit accounts as the contracts are day to day and recognized as the service is provided. Gains and losses on the sale of foreclosed real estate are generally accounted for under ASC 610. However, ASU 2014-09 also added a new Subtopic 610-20 which addresses the recognition of gains and losses on the transfer of nonfinancial and in-substance nonfinancial assets. Gain and loss recognition is not expected to change except for foreclosed real estate and other nonfinancial asset sales that are financed by the Company. In the case of financed sales, the Company will need to evaluate each contract to determine whether each contract criteria are met, including whether it is probable that it will collect substantially all consideration to which it is entitled. The Company will also need to evaluate whether the financing terms offered to the buyer of the nonfinancial asset are market terms when determining the transaction price. In January 2016, the FASB issued ASU 2016-01 “Financial Instruments – Overall.” The amendments in ASU 2016-01 are intended to improve the recognition, measurement, presentation and disclosure of financial assets and liabilities to provide users of financial statements with information that is more useful for decision-making purposes. Among other changes, ASU 2016-01 would require equity securities to be reclassified out of available for sale and measured at fair value with changes in fair value recognized through net income but would allow equity securities that do not have readily determinable fair values to be re-measured at fair value either upon the occurrence of an observable price change or upon identification of an impairment. The amendments would simplify the impairment assessment of such equity securities and would require enhanced disclosure about these investments. ASU 2016-01 would also require separate presentation of financial assets and liabilities by measurement category and type of instrument, such as securities or loans, on the balance sheet or in the notes, and would eliminate certain other disclosures relating to the methods and assumptions used to estimate fair value. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2018, including interim periods within that fiscal year. Early adoption is not permitted. ASU 2016-01 is not expected to have a material impact on the Company’s consolidated financial position or results of operations. The impact on disclosures is currently being evaluated by management. In March 2017, the FASB issued ASU 2017-07 “Compensation – Retirement Benefits (Topic 715): Improving the presentation of net periodic pension cost and net periodic postretirement benefit cost.” The amendments in this update require that an employer disaggregate the service cost component from the other components of net benefit cost, with the other components required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. Additionally, the amendment also allows only the service cost component to be eligible for capitalization when applicable. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2018, including interim periods within that fiscal year. ASU 2017-07 will not have a material impact on the Company’s consolidated financial position or results of operations. In February 2016, the FASB issued ASU 2016-02 “Leases.” ASU 2016-02 affects any entity that enters into a lease and is intended to increase the transparency and comparability of financial statements among organizations. The ASU requires, among other changes, a lessee to recognize on its balance sheet a lease asset and a lease liability for those leases previously classified as operating leases. The lease asset would represent the right to use the underlying asset for the lease term and the lease liability would represent the discounted value of the required lease payments to the lessor. The ASU would also require entities to disclose key information about leasing arrangements. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2019, including interim periods within that fiscal year. Early adoption is permitted. The Company currently leases eleven branches and two administrative offices. ASU 2016-02 will result in the establishment of a right to use asset and corresponding lease obligation, the materiality of which has yet to be determined by management, however the ASU is not expected to have a material impact on the Company’s consolidated results of operations or disclosures. In June 2016, the FASB issued ASU 2016-13 “Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 affects entities holding financial assets that are not accounted for at fair value through net income, including loans, debt securities, and other financial assets. The ASU requires financial assets measured at amortized cost basis to be presented at the net amount expected to be collected by recording an allowance for current expected credit losses. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2020, including interim periods within that fiscal year. Early adoption is permitted beginning after December 15, 2018, including interim periods within those fiscal years. Management is currently evaluating the impact that ASU 2016-13 will have on the Company’s consolidated financial position, results of operations and disclosures. In January 2017, the FASB issued ASU 2017-04 “Intangibles – Goodwill and Other (Topic 350).” s In March 2017, the FASB issued ASU 2017-08 "Receivables - Non-Refundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities." The ASU requires premiums on callable debt securities 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. The amendments in this update will be effective for the Company for the fiscal year beginning on July 1, 2020, including interim periods within that fiscal year. Early adoption is permitted beginning after December 15, 2018, including interim periods within those fiscal years. ASU 2017-08 will not have a material impact on the Company’s consolidated financial position, results of operations or disclosures. On February 14, 2018, the FASB issued ASU 2018-02 "Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of certain tax effects from accumulated other comprehensive income." The ASU intended to help organizations reclassify certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017. The ASU requires the reclassification of stranded tax effects within accumulated other comprehensive income to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the TAX Cuts and Job Act 2017 (or portion thereof) is recorded. The amount of the reclassification is the difference between the historical corporate income tax rate (34 percent) and the newly enacted 21 percent corporate income tax rate. The Company has elected to early adopt the ASU as of March 31, 2018, resulting in a $1.1 million reclassification between accumulated other comprehensive income and retained earnings. There is no impact to current earnings and no prior period information has been retroactively adjusted as a result of implementing the ASU. No additional reclassifications will be required in the future periods as a result of this guidance. The ASU is applied specifically to the impacts of the Tax Cuts and Jobs Act of 2017 and is not effective for other or future state or federal tax law changes.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Shareholders' Equity	Note 3. Shareholders' Equity The Company completed its initial public offering (“IPO”) on April 20, 2017, in connection with the Bank’s mutual-to-stock conversion, resulting in gross proceeds of $178.3 million, through the sale of 17,826,408 shares, including 1,453,209 shares sold to the PCSB Bank Employee Stock Ownership Plan (ESOP), at the offering price of $10.00 per share. In addition, the Company also contributed 338,702 shares of its common stock and $1.6 million in cash to the PCSB Community Foundation. Expenses related to the offering were $3.7 million, which resulted in net proceeds of $174.6 million prior to the contribution to PCSB Community Foundation. The Company lent $14.5 million to the ESOP and contributed $87.3 million to the Bank, with the remainder of the net proceeds of the offering prior to the contribution to PCSB Community Foundation being retained at the holding company. Prior to the IPO, the Company had no outstanding shares.

Investment Securities

Investment Securities	9 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Investment Securities	Note 4. Investment Securities The amortized cost, gross unrealized/unrecognized gains and losses and fair value of available for sale and held to maturity securities at March 31, 2018 and June 30, 2017 were as follows: March 31, 2018 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 62,437 $ - $ (871 ) $ 61,566 Corporate and other debt securities 8,420 - (157 ) 8,263 Mortgage-backed securities – residential 38,149 123 (812 ) 37,460 Equity securities 32 - - 32 Total available for sale $ 109,038 $ 123 $ (1,840 ) $ 107,321 Held to maturity: U.S. Government and agency obligations $ 132,050 $ - $ (2,153 ) $ 129,897 Corporate and other debt securities 4,000 - (81 ) 3,919 Mortgage-backed securities – residential 141,258 86 (4,070 ) 137,274 Mortgage-backed securities – collateralized mortgage obligations 55,814 - (1,582 ) 54,232 Mortgage-backed securities – commercial 33,240 22 (823 ) 32,439 Total held to maturity $ 366,362 $ 108 $ (8,709 ) $ 357,761 June 30, 2017 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 63,630 $ 31 $ (216 ) $ 63,445 Corporate and other debt securities 8,460 58 (36 ) 8,482 Mortgage-backed securities – residential 39,710 363 (143 ) 39,930 Equity securities 32 - - 32 Total available for sale $ 111,832 $ 452 $ (395 ) $ 111,889 Held to maturity: U.S. Government and agency obligations $ 155,559 $ 23 $ (574 ) $ 155,008 Corporate and other debt securities 999 - - 999 Mortgage-backed securities – residential 143,452 828 (497 ) 143,783 Mortgage-backed securities – collateralized mortgage obligations 59,476 146 (235 ) 59,387 Mortgage-backed securities – commercial 24,065 412 (66 ) 24,411 Total held to maturity $ 383,551 $ 1,409 $ (1,372 ) $ 383,588 During the nine months ended March 31, 2018, the Company sold securities with a carrying amount of $6.6 million, resulting in $173,000 of net realized gains. Included was the disposal of $681,000 of securities classified as held to maturity, resulting in net realized gains of $34,000. These securities were comprised of seasoned mortgage-backed securities where the Company collected a substantial portion (at least 85%) of the principal outstanding at acquisition due to prepayments or scheduled payments payable in equal installments, comprising both principal and interest, over the terms. There was no sales of or realized gains or losses on investment securities for the three or nine months ended March 31, 2017. The following table presents the fair value and carrying amount of debt securities at March 31, 2018, by contractual maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Held to maturity Available for sale Carrying Fair Amortized Fair Amount Value Cost Value (in thousands) March 31, 2018: 1 year or less $ 31,504 $ 31,382 $ 13,404 $ 13,349 1 to 5 years 100,546 98,515 55,453 54,504 5 to 10 years - - 2,000 1,976 Mortgage-backed securities and other 234,312 227,864 38,149 37,460 Total $ 366,362 $ 357,761 $ 109,006 $ 107,289 Securities pledged had carrying amounts of $129.6 million and $95.5 million at March 31, 2018 and June 30, 2017, respectively, and were pledged principally to secure FHLB advances and public deposits. The following table provides information regarding investment securities with unrealized/unrecognized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position at March 31, 2018 and June 30, 2017 March 31, 2018 Less than 12 months 12 months or greater Total Unrealized/ Unrealized/ Unrealized/ Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Loss Value Loss Value Loss (in thousands) Available for sale: U.S. Government and agency obligations $ 38,880 $ (492 ) $ 21,686 $ (379 ) $ 60,566 $ (871 ) Corporate and other debt securities 8,262 (157 ) - - 8,262 (157 ) Mortgage-backed securities – residential 22,324 (493 ) 10,101 (319 ) 32,425 (812 ) Total available for sale $ 69,466 $ (1,142 ) $ 31,787 $ (698 ) $ 101,253 $ (1,840 ) Held to maturity: U.S. Government and agency obligations $ 66,915 $ (1,117 ) $ 62,982 $ (1,036 ) 129,897 $ (2,153 ) Corporate and other debt securities 3,919 (81 ) - - 3,919 (81 ) Mortgage-backed securities – residential 110,055 (2,901 ) 25,580 (1,169 ) 135,635 (4,070 ) Mortgage-backed securities – collateralized mortgage obligations 43,000 (1,099 ) 11,232 (483 ) 54,232 (1,582 ) Mortgage-backed securities – commercial 20,038 (464 ) 8,698 (359 ) 28,736 (823 ) Total held to maturity $ 243,927 $ (5,662 ) $ 108,492 $ (3,047 ) $ 352,419 $ (8,709 ) June 30, 2017 Less than 12 months 12 months or greater Total Unrealized/ Unrealized/ Unrealized/ Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Loss Value Loss Value Loss (in thousands) Available for sale U.S. Government and agency obligations $ 41,900 $ (200 ) $ 3,993 $ (16 ) $ 45,893 $ (216 ) Corporate and other debt securities 1,964 (36 ) - - 1,964 (36 ) Mortgage-backed securities – residential 18,861 (111 ) 3,200 (32 ) 22,061 (143 ) Total available for sale $ 62,725 $ (347 ) $ 7,193 $ (48 ) $ 69,918 $ (395 ) Held to maturity U.S. Government and agency obligations $ 113,511 $ (531 ) $ 5,981 $ (43 ) $ 119,492 $ (574 ) Corporate and other debt securities 999 - - - 999 - Mortgage-backed securities – residential 39,754 (467 ) 1,626 (30 ) 41,380 (497 ) Mortgage-backed securities – collateralized mortgage obligations 26,622 (141 ) 4,444 (94 ) 31,066 (235 ) Mortgage-backed securities – commercial 9,092 (66 ) - - 9,092 (66 ) Total held to maturity $ 189,978 $ (1,205 ) $ 12,051 $ (167 ) $ 202,029 $ (1,372 ) As of March 31, 2018, the Company’s security portfolio consisted of $473.7 million in securities, of which 256 securities with a fair value of $453.7 million were in an unrealized loss position. As of June 30, 2017, the Company’s security portfolio consisted of $495.4 million in securities, of which 156 securities with a fair value of $271.9 million were in an unrealized loss There were no securities for which the Company believes it is not probable that it will collect all amounts due according to the contractual terms of the security as of March 31, 2018 and June 30, 2017. Management believes the unrealized losses are primarily a result of changes in interest rates. The Company has determined that it does not intend to sell, or it is not more likely than not that it will be required to sell, its securities that are in an unrealized loss position prior to the recovery of its amortized cost basis. Therefore, the Company did not consider any securities to be other-than-temporarily impaired as of March 31, 2018 and June 30, 2017.

Loans Receivable

Loans Receivable	9 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Loans Receivable	Note 5. Loans Receivable Loans receivable are summarized as follows (in thousands): March 31, June 30, 2018 2017 Mortgage loans: Residential $ 253,847 $ 217,778 Commercial 484,810 437,651 Construction 16,098 22,404 Net deferred loan origination costs 1,203 397 Total mortgages 755,958 678,230 Commercial and consumer loans: Commercial loans 35,897 33,297 Other loans secured 47,770 46,802 Home equity lines of credit 38,220 41,927 Consumer and installment loans 12,773 13,765 Net deferred loan origination costs 724 777 Total commercial and consumer loans 135,384 136,568 Total loans receivable 891,342 814,798 Allowance for loan losses (4,624 ) (5,150 ) Loans receivable, net $ 886,718 $ 809,648 In April 2015, the Company completed a merger with CMS Bancorp and its wholly owned subsidiary, CMS Bank. References to acquired loans in this note pertain only to those loans acquired as part of the merger. During the nine months ended March 31, 2018, the Company purchased whole loans and loan participations totaling $88.6 million, including $46.4 million of commercial mortgage loans and $42.2 million of residential mortgage loans. The following tables present the activity in the allowance for loan losses by portfolio segment for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three Months Ended March 31, 2018 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 402 $ (20 ) $ (47 ) $ - $ 335 Commercial 2,686 131 - - 2,817 Construction 400 90 - - 490 Commercial loans 322 2 - - 324 Other loans secured 389 (180 ) (13 ) 210 406 Home equity lines of credit 74 35 (60 ) 19 68 Consumer and installment loans 133 (4 ) (10 ) - 119 Acquired: Residential 65 - - - 65 Total $ 4,471 $ 54 $ (130 ) $ 229 $ 4,624 Three Months Ended March 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 238 $ 158 $ (15 ) $ - $ 381 Commercial 3,031 (621 ) - - 2,410 Construction 336 552 - - 888 Commercial loans 501 48 - - 549 Other loans secured 339 31 - - 370 Home equity lines of credit 70 3 - - 73 Consumer and installment loans 113 61 (19 ) 4 159 Acquired: Commercial loans - 3 (3 ) - - Total $ 4,628 $ 235 $ (37 ) $ 4 $ 4,830 Nine Months Ended March 31, 2018 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 360 $ 39 $ (64 ) $ - $ 335 Commercial 2,589 228 - - 2,817 Construction 1,150 337 (997 ) - 490 Commercial loans 440 (116 ) - - 324 Other loans secured 365 (156 ) (13 ) 210 406 Home equity lines of credit 76 33 (60 ) 19 68 Consumer and installment loans 144 (15 ) (10 ) - 119 Acquired: Residential 26 39 - - 65 Total $ 5,150 $ 389 $ (1,144 ) $ 229 $ 4,624 Nine Months Ended March 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 237 $ 89 $ (15 ) $ 70 $ 381 Commercial 2,149 242 - 19 2,410 Construction 269 619 - - 888 Commercial loans 604 (628 ) - 573 549 Other loans secured 397 199 (324 ) 98 370 Home equity lines of credit 73 - - - 73 Consumer and installment loans 313 259 (417 ) 4 159 Acquired: - Residential - 38 (38 ) - - Commercial loans - 2 (2 ) Consumer and installment loans - 3 (3 ) - - Total $ 4,042 $ 823 $ (799 ) $ 764 $ 4,830 The following tables present the balance in the allowance for loan losses and the recorded investment in loans, excluding net deferred fees and accrued interest, by portfolio segment, and based on impairment method as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 Loans Allowance for Loan Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Residential $ 2,879 $ 249,655 $ 1,313 $ 253,847 $ 127 $ 208 $ 65 $ 400 Commercial 2,440 480,887 1,483 484,810 - 2,817 - 2,817 Construction 2,260 13,838 - 16,098 276 214 - 490 Commercial loans 349 35,548 - 35,897 8 316 - 324 Other loans secured 3,973 43,797 - 47,770 1 405 - 406 Home equity lines of credit 416 37,633 171 38,220 5 63 - 68 Consumer and installment loans - 12,773 - 12,773 - 119 - 119 Total $ 12,317 $ 874,131 $ 2,967 $ 889,415 $ 417 $ 4,142 $ 65 $ 4,624 June 30, 2017 Loans Allowance for Loan Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Residential $ 4,471 $ 211,983 $ 1,324 $ 217,778 $ 131 $ 229 $ 26 $ 386 Commercial 2,411 433,416 1,824 437,651 - 2,589 - 2,589 Construction 3,661 18,743 - 22,404 997 153 - 1,150 Commercial loans 356 32,941 - 33,297 7 433 - 440 Other loans secured 5,813 40,989 - 46,802 2 363 - 365 Home equity lines of credit 610 41,140 177 41,927 5 71 - 76 Consumer and installment loans - 13,723 42 13,765 - 144 - 144 Total $ 17,322 $ 792,935 $ 3,367 $ 813,624 $ 1,142 $ 3,982 $ 26 $ 5,150 The following tables present information related to loans individually evaluated for impairment (excluding loans acquired with deteriorated credit quality) by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 2,698 $ 2,428 $ - Commercial 2,946 2,440 - Other loans secured 7,163 2,916 - Home equity lines of credit 471 405 - With a related allowance recorded: Residential 390 451 127 Construction 3,257 2,260 276 Commercial loans 349 349 8 Other loans secured 1,057 1,057 1 Home equity lines of credit 11 11 5 Total $ 18,342 $ 12,317 $ 417 June 30, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 4,216 $ 4,014 $ - Commercial 2,935 2,411 - Construction 404 404 - Commercial loans 276 277 - Other loans secured 9,157 4,702 - Home equity lines of credit 599 599 - With a related allowance recorded: Residential 395 457 131 Construction 3,257 3,257 997 Commercial loans 79 79 7 Other loans secured 1,111 1,111 2 Home equity lines of credit 11 11 5 Total $ 22,440 $ 17,322 $ 1,142 The table below presents the average recorded investment and interest income recognized on loans individually evaluated for impairment, by class of loans, for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three months ended Three months ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 2,776 $ 13 $ 3,048 $ - Commercial 2,440 37 2,287 32 Commercial loans - - 89 1 Other loans secured 3,027 68 4,804 53 Home equity lines of credit 452 - 599 - With a related allowance recorded: Residential 452 4 517 4 Construction 2,260 - 3,388 - Commercial loans 350 1 - - Other loans secured 1,067 13 1,129 14 Home equity lines of credit 11 - 11 - Total $ 12,835 $ 136 $ 15,872 $ 104 Nine Months Ended Nine Months Ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,360 $ 179 $ 3,078 $ - Commercial 2,447 91 2,303 95 Construction 121 17 - - Commercial loans - - 91 3 Other loans secured 3,704 228 4,846 172 Home equity lines of credit 549 20 599 (2 ) With a related allowance recorded: Residential 454 11 513 14 Construction 2,858 - 3,073 71 Commercial loans 353 5 - - Other loans secured 1,086 40 1,141 43 Home equity lines of credit 11 - 11 - Total $ 14,943 $ 591 $ 15,655 $ 396 The following table presents the recorded investment in nonaccrual loans and in loans past due over 90 days and still on accrual status, by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): Loans Past Due Over 90 Days Nonaccrual and Still Accruing March 31, June 30, March 31, June 30, 2018 2017 2018 2017 Originated: Residential $ 1,129 $ 2,581 $ - $ - Commercial 262 - - - Construction 2,260 3,661 - - Commercial loans 275 - - - Other loans secured 1,307 2,959 - - Home equity lines of credit 100 302 - - Acquired: Residential 1,299 1,776 - - Commercial 508 497 - - Home equity lines of credit 304 296 - - Total $ 7,444 $ 12,072 $ - $ - Nonperforming loans include both smaller-balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. The table above excludes nonaccrual acquired loans that are accounted for as purchased credit impaired loans totaling $1.8 million and $2.7 million as of March 31, 2018 and June 30, 2017, respectively. Such loans are excluded because the loans are in pools that are considered performing. The discounts arising from recording these loans at fair value upon acquisition were due in part to credit quality and the accretable yield is being recognized as interest income over the life of the loans based on expected cash flows. The following tables present the aging of the recorded investment in past due loans by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ - $ - $ 736 $ 736 $ 195,610 $ 196,346 Commercial 775 - 262 1,037 407,747 408,784 Construction - - 2,260 2,260 13,838 16,098 Commercial loans - - 275 275 35,033 35,308 Other loans secured - - 500 500 47,140 47,640 Home equity lines of credit - - 100 100 32,646 32,746 Consumer and installment loans - - - - 12,624 12,624 Total originated 775 - 4,133 4,908 744,638 749,546 Acquired: Residential 233 - 1,797 2,030 55,471 57,501 Commercial - - 1,087 1,087 74,939 76,026 Commercial loans - - - - 589 589 Other loans secured - - - - 130 130 Home equity lines of credit 23 - 296 319 5,155 5,474 Consumer and installment loans - - - - 149 149 Total acquired 256 - 3,180 3,436 136,433 139,869 Total $ 1,031 $ - $ 7,313 $ 8,344 $ 881,071 $ 889,415 June 30, 2017 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ 94 $ 275 $ 1,973 $ 2,342 $ 153,390 $ 155,732 Commercial - - - - 355,247 355,247 Construction - - 3,661 3,661 18,743 22,404 Commercial loans - - - - 31,613 31,613 Other loans secured - - 544 544 43,612 44,156 Home equity lines of credit - 199 103 302 35,246 35,548 Consumer and installment loans - - - - 13,435 13,435 Total originated 94 474 6,281 6,849 651,286 658,135 Acquired: Residential 237 463 1,472 2,172 59,874 62,046 Commercial - - 1,054 1,054 81,350 82,404 Commercial loans - - - - 1,684 1,684 Other loans secured - - - - 2,646 2,646 Home equity lines of credit - - 296 296 6,083 6,379 Consumer and installment loans - - - - 330 330 Total acquired 237 463 2,822 3,522 151,967 155,489 Total $ 331 $ 937 $ 9,103 $ 10,371 $ 803,253 $ 813,624 Troubled Debt Restructurings The terms of certain loans were modified as troubled debt restructurings. The modification of the terms of such loans included one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan. As of March 31, 2018 and June 30, 2017, the Company had 16 and 20 loans classified as troubled debt restructurings totaling $7.0 million and $9.9 million, respectively. The Company has allocated $141,000 and $145,000, respectively, of specific reserves to customers whose loan terms have been modified in troubled debt restructurings as of March 31, 2018 and June 30, 2017 and has not committed to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings. The Company did not modify any loans as troubled debt restructuring during the three or nine months ended March 31, 2018. The Company modified one loan as a troubled debt restructuring in the three and nine months ended March 31, 2017. The Company had two troubled debt restructurings with a total carrying amount of $1.1 million at March 31, 2018 for which there was a payment default in the nine months ended March 31, 2018 that were modified in the twelve months prior to default, resulting in a $2,000 increase to the allowance for loan loss. One default, with a carrying amount of $807,000, has been cured as of March 31, 2018. There were no such defaults during the three months ended March 31, 2018. There were two troubled debt restructurings with a total carrying amount of $929,000 for which there was a payment default in the three and nine months ended March 31, 2017. These defaults resulted in no increase to the allowance for loan losses. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. Credit Quality Indicators The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually by classifying the loans as to credit risk. This analysis includes non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed on a monthly basis. The Company utilized the same grading process for acquired loans as it does for originated loans. The Company uses the following definitions for risk ratings: Special Mention – Loans classified as special mention have a potential weakness that deserves management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution's credit position at some future date. Substandard – Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful – Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loans not meeting the criteria above that are analyzed individually as part of the above-described process and loans in groups of homogenous loans are considered to be pass rated loans. These loans are monitored based on delinquency and performance. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows (in thousands): March 31, 2018 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 194,594 $ 548 $ 1,204 $ - $ 196,346 Commercial 405,696 - 3,088 - 408,784 Construction 13,838 - 2,260 - 16,098 Commercial loans 32,647 - 2,661 - 35,308 Other loans secured 42,606 - 5,034 - 47,640 Home equity lines of credit 32,599 102 45 - 32,746 Consumer and installment loans 12,624 - - - 12,624 Total originated 734,604 650 14,292 - 749,546 Acquired: Residential 54,367 253 2,881 - 57,501 Commercial 72,565 1,470 1,991 - 76,026 Commercial loans 589 - - - 589 Other loans secured 116 14 - - 130 Home equity lines of credit 5,074 - 400 - 5,474 Consumer and installment loans 149 - - - 149 Total acquired 132,860 1,737 5,272 - 139,869 Total $ 867,464 $ 2,387 $ 19,564 $ - $ 889,415 June 30, 2017 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 153,165 $ - $ 2,567 $ - $ 155,732 Commercial 352,203 134 2,910 - 355,247 Construction 18,743 - 3,661 - 22,404 Commercial loans 28,944 - 2,669 - 31,613 Other loans secured 37,267 - 6,889 - 44,156 Home equity lines of credit 35,246 58 244 - 35,548 Consumer and installment loans 13,405 - 30 - 13,435 Total originated 638,973 192 18,970 - 658,135 Acquired: Residential 58,665 - 3,381 - 62,046 Commercial 80,082 - 2,322 - 82,404 Commercial loans 1,684 - - - 1,684 Other loans secured 2,646 - - - 2,646 Home equity lines of credit 5,906 - 473 - 6,379 Consumer and installment loans 330 - - - 330 Total acquired 149,313 - 6,176 - 155,489 Total $ 788,286 $ 192 $ 25,146 $ - $ 813,624 Purchased Credit Impaired Loans The Company has acquired loans for which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans as of March 31, 2018 and June 30, 2017 is as follows (in thousands): March 31, June 30, 2018 2017 Residential $ 1,248 $ 1,298 Commercial 1,483 1,824 Home equity lines of credit 171 177 Consumer and installment loans - 42 Carrying amount, net of allowance of $65 and $26, respectively $ 2,902 $ 3,341 The allowance for loan losses on purchased credit impaired loans was unchanged during the three months ended March 31, 2018 and increased $39,000 during the nine months ended March 31, 2018. Accretable yield, or income expected to be collected, for acquired loans is as follows (in thousands): Three Months Ended March 31, Nine Months Ended March 31, 2018 2017 2018 2017 Beginning balance $ 238 $ 486 $ 403 $ 578 New loans acquired - - - - Accretion income (7 ) (47 ) (59 ) (139 ) Reclassification from non-accretable difference - - - - Disposals - - (113 ) - Ending balance $ 231 $ 439 $ 231 $ 439

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Other Comprehensive Income (Loss)	Note 6. Other Comprehensive Income (Loss) The following is a summary of the accumulated other comprehensive income (loss) balances, net of tax (in thousands): Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at January 1, 2018 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) Other comprehensive loss before reclassifications (705 ) - - (705 ) Amounts reclassified from accumulated other comprehensive income - 182 10 192 Tax effect 149 (39 ) (3 ) 107 Net other comprehensive (loss) income (556 ) 143 7 (406 ) Reclassification of certain tax effects on other comprehensive income ( 1) (132 ) (938 ) (47 ) (1,117 ) Balance at March 31, 2018 $ (1,357 ) $ (5,558 ) $ (278 ) $ (7,193 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at January 1, 2017 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 ) Other comprehensive income before reclassifications 319 4,357 - 4,676 Amounts reclassified from accumulated other comprehensive income - (727 ) 24 (703 ) Tax effect (109 ) (1,233 ) (9 ) (1,351 ) Net other comprehensive income 210 2,397 15 2,622 Balance at March 31, 2017 $ 1 $ (4,905 ) $ (764 ) $ (5,668 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at July 1, 2017 $ 37 $ (5,002 ) $ (250 ) $ (5,215 ) Other comprehensive loss before reclassifications (1,635 ) - - (1,635 ) Amounts reclassified from accumulated other comprehensive income (139 ) 544 26 431 Tax effect 512 (162 ) (7 ) 343 Net other comprehensive (loss) income (1,262 ) 382 19 (861 ) Reclassification of certain tax effects on other comprehensive income ( 1) (132 ) (938 ) (47 ) (1,117 ) Balance at March 31, 2018 $ (1,357 ) $ (5,558 ) $ (278 ) $ (7,193 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at July 1, 2016 $ 523 $ (7,683 ) $ (810 ) $ (7,970 ) Other comprehensive (loss) income before reclassifications (790 ) 4,357 - 3,567 Amounts reclassified from accumulated other comprehensive income - (149 ) 70 (79 ) Tax effect 268 (1,430 ) (24 ) (1,186 ) Net other comprehensive (loss) income (522 ) 2,778 46 2,302 Balance at March 31, 2017 $ 1 $ (4,905 ) $ (764 ) $ (5,668 ) (1) Represents the impact of adopting ASU 2018-02 requiring the reclassification of certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act of 2017 (or portion thereof) is recorded. The amount of the reclassification is the difference between the historical corporate income tax rate (34 percent) and the newly enacted 21 percent corporate income tax rate. The reclassification is as of March 31, 2018; no prior period information has been retroactively adjusted as a result of implementing the ASU.

Post-Retirement Benefits

Post-Retirement Benefits	9 Months Ended
	Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Post-Retirement Benefits	Note 7. Post-Retirement Benefits Employee Pension Plan Supplemental Retirement Plans Net periodic benefit cost and other amounts recognized in other comprehensive income for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2017 Defined Benefit Plan Supplemental Retirement Plans Defined Benefit Plan Supplemental Retirement Plans Service cost $ - $ 149 $ 150 $ 100 Interest cost 242 26 250 32 Expected return on plan assets (505 ) - (462 ) - Amortization of prior net loss - - 300 23 Amortization of prior service cost 182 10 (48 ) - Gain on curtailment - - (919 ) - Net periodic (benefit) cost $ (81 ) $ 185 $ (729 ) $ 155 Nine Months Ended Nine Months Ended March 31, 2018 March 31, 2017 Defined Benefit Plan Supplemental Retirement Plan Defined Benefit Plan Supplemental Retirement Plan Service cost $ - $ 369 $ 519 $ 261 Interest cost 726 76 757 91 Expected return on plan assets (1,511 ) - (1,424 ) - Amortization of prior net loss - - 1,021 70 Amortization of prior service cost 544 26 (192 ) - Gain on curtailment - - (919 ) - Net periodic cost $ (241 ) $ 471 $ (238 ) $ 422 The Company made no contributions to the defined benefit plan during the three and nine months ended March 31, 2018 and expects to make no contributions to the plan for the year ending June 30, 2018. Employee Stock Ownership Plan On January 1, 2017, the Company established an Employee Stock Ownership Plan (“ESOP”) to provide eligible employees the opportunity to own Company stock. The plan is a tax-qualified retirement plan for the benefit of Company employees. The Company granted a loan to the ESOP for the purchase of 1,453,209 shares of the Company’s common stock at a price of $10.00 per share. The loan obtained by the ESOP from the Company to purchase the common stock is payable annually over 15 years at a rate per annum equal to the Prime Rate, reset annually on January 1st (4.5% at March 31, 2018). Loan payments are principally funded by cash contributions from the Bank. The loan is secured by the shares purchased, which are held in a suspense account for allocation among participants as the loan is repaid. The balance of the ESOP loan at March 31, 2018 was $13.6 million. Contributions are allocated to eligible participants on the basis of compensation, subject to federal tax limits. The number of shares committed to be released annually is 96,881 through 2032. Shares held by the ESOP include the following: March 31, 2018 June 30, 2017 Allocated 96,881 - Committed to be allocated 23,888 26,975 Unallocated 1,332,440 1,426,234 Total shares 1,453,209 1,453,209 The fair value of unallocated shares was $28.0 million at March 31, 2018. Total compensation expense recognized in connection with the ESOP for the three and nine

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 8. Fair Value of Financial Instruments Fair value is the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair values: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. A description of the valuation methodologies used for assets and liabilities measured at fair value, as well as general classification of such instruments pursuant to the valuation hierarchy, is set forth below. While management believes the Company’s valuation methodologies are appropriate and consistent with other financial institutions, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Investment Securities Impaired Loans Foreclosed Real Estate Real estate owned properties are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Appraisals for both collateral-dependent impaired loans and real estate owned are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, a member of the Credit Department, as well as a third-party specialist, where deemed appropriate, reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry-wide statistics. Once appraisals are considered appropriate, management discounts the appraised value for estimated selling costs, such as legal, broker, and property maintenance and insurance costs. The most recent analysis performed indicated discount rates ranging between 10% and 20% should be applied to properties with appraisals performed. Assets and liabilities measured at fair value are summarized below (in thousands): Fair Value Measurements Level 1 Level 2 Level 3 Total March 31, 2018 Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 61,566 $ - $ 61,566 Corporate and other debt securities - 8,263 - 8,263 Mortgage-backed securities – residential - 37,460 - 37,460 Equity securities - 32 - 32 Total assets at fair value $ - $ 107,321 $ - $ 107,321 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 399 $ 399 Construction - - 1,984 1,984 Commercial loans - - 286 286 Other loans secured - - 500 500 Home equity lines of credit - - 6 6 Foreclosed real estate - - 144 144 Total assets at fair value $ - $ - $ 3,319 $ 3,319 Fair Value Measurements Level 1 Level 2 Level 3 Total June 30, 2017 Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 63,445 $ - $ 63,445 Corporate and other debt securities - 8,482 - 8,482 Mortgage-backed securities – residential - 39,930 - 39,930 Equity securities - 32 - 32 Total assets at fair value $ - $ 111,889 $ - $ 111,889 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 1,126 $ 1,126 Construction - - 2,260 2,260 Commercial loans - - 72 72 Other loans secured - - 1,609 1,609 Home equity lines of credit - - 5 5 Foreclosed real estate - - 977 977 Total assets at fair value $ - $ - $ 6,049 $ 6,049 There were no transfers between levels within the fair value hierarchy during the three or nine months ended March 31, 2018. Impaired loans in the table above had a carrying amount of $3.4 million, and a remaining valuation allowance of $278,000 at March 31, 2018, as compared to $6.3 million and $1.1 million, respectively, as of June 30, 2017. Impaired loans measured at fair value incurred $1.1 million of net charge-offs and resulted in an additional provision for loan losses of $201,000 during the nine months ended March 31, 2018. Impaired loans measured at fair value as of March 31, 2017 incurred $38,000 of net charge-offs and resulted in an additional provision for loan losses of $824,000 during the nine months ended March 31, 2017. The following tables present quantitative information about Level 3 fair value measurements for selected financial instruments measured at fair value on a non-recurring basis at March 31, 2018 and June 30, 2017 (dollars in thousands): Valuation Unobservable Range or Fair Value Technique(s) Input(s) Rate Used March 31, 2018: Impaired loans - residential mortgages $ 399 Sales comparison Adjustments for differences in sales comparables -3.3% to 21.1% Impaired loans - construction 1,984 Sales contract Discount to sales contract 10.0% Impaired loans - commercial loans 286 Discounted cash flow Discount rate 5.3% Impaired loans - other loans secured 500 Sales contract Discount to sales contract 10.0% Impaired loans - home equity lines of credit 6 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% Foreclosed real estate 144 Sales comparison Adjustments for differences in sales comparables -40.0% to 8.8% June 30, 2017: Impaired loans - residential mortgages $ 1,126 Sales comparison Adjustments for differences in sales comparables -5.1% to 7.8% Discounted cash flow Discount rate 5.4% to 6.3% Impaired loans - construction 2,260 Cost approach Discount for distressed property 50.0% Impaired loans - commercial 72 Discounted cash flow Adjustments for differences in sales comparables 7.0% to 7.5% Impaired loans - other loans secured 1,609 Discounted cash flow Discount rate 6.0% Sales comparison Adjustments for differences in sales comparables 0.0% Impaired loans - home equity lines of credit 5 Discounted cash flow Discount rate 6.3% Foreclosed real estate 977 Sales comparison Adjustments for differences in sales comparables -23.4% to 7.2% The following is a summary of the carrying amounts and estimated fair values of the Company’s financial assets and liabilities (in thousands) (none of which are held for trading purposes): Carrying Fair Value Measurements Amount Level 1 Level 2 Level 3 Total March 31, 2018: Financial assets: Cash and cash equivalents $ 36,505 $ 36,505 $ - $ - $ 36,505 Investment securities held to maturity 366,362 - 357,648 113 357,761 Investment securities available for sale 107,321 - 107,321 - 107,321 Loans receivable, net 886,718 - - 873,570 873,570 Accrued interest receivable 4,458 - 1,580 2,878 4,458 Federal Home Loan Bank stock 4,112 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 765,560 765,560 - - 765,560 Time deposits 322,425 - 324,732 - 324,732 Mortgage escrow funds 7,596 7,596 - - 7,596 FHLB advances 68,872 - 68,681 - 68,681 June 30, 2017: Financial assets: Cash and cash equivalents $ 60,486 $ 60,486 $ - $ - $ 60,486 Investment securities held to maturity 383,551 - 383,318 270 383,588 Investment securities available for sale 111,889 - 111,889 - 111,889 Loans receivable, net 809,648 - - 817,814 817,814 Accrued interest receivable 3,693 - 1,243 2,450 3,693 Federal Home Loan Bank stock 3,132 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 793,681 793,681 - - 793,681 Time deposits 294,780 - 297,508 - 297,508 Mortgage escrow funds 8,084 8,084 - - 8,084 FHLB advances 42,598 - 45,504 - 45,504 The methods and assumptions, not previously presented, used to estimate fair values are described as follows: Cash and Cash Equivalents Loans Receivable, Net FHLB Stock Accrued Interest Receivable/Payable Deposits FHLB Advances

Regulatory Capital

Regulatory Capital	9 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Regulatory Capital	Note 9. Regulatory Capital The following is a summary of the Company’s and Bank’s actual capital amounts and ratios as of March 31, 2018 and June 30, 2017, compared to the required ratios for minimum capital adequacy and for classification as well capitalized (dollars in thousands): To Be Well Capitalized Under Prompt For Capital Adequacy Corrective Action Bank Actual Purposes Provisions Amount Ratio Amount Ratio Amount Ratio March 31, 2018: PCSB Bank Leverage (Tier 1) $ 202,158 14.0 % $ 56,557 4.0 % $ 70,696 5.0 % Risk-based: Common Tier 1 202,158 21.2 42,015 4.5 60,688 6.5 Tier 1 202,158 21.2 56,020 6.0 74,693 8.0 Total 197,534 21.7 74,693 8.0 93,366 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 285,305 20.2 % $ 56,612 4.0 % N/A N/A Risk-based: Common Tier 1 285,305 30.5 42,056 4.5 N/A N/A Tier 1 285,305 30.5 56,075 6.0 N/A N/A Total 289,929 31.0 74,766 8.0 N/A N/A June 30, 2017: PCSB Bank Leverage (Tier 1) $ 190,990 13.7 % $ 55,949 4.0 % $ 69,936 5.0 % Risk-based: Common Tier 1 190,990 21.7 39,631 4.5 57,245 6.5 Tier 1 190,990 21.7 52,841 6.0 70,455 8.0 Total 196,140 22.3 70,455 8.0 88,069 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 278,528 20.0 % $ 55,839 4.0 % N/A N/A Risk-based: Common Tier 1 278,528 31.6 39,631 4.5 N/A N/A Tier 1 278,528 31.6 52,841 6.0 N/A N/A Total 283,678 32.2 70,455 8.0 N/A N/A In addition to the ratios above, the Basel III Capital Rules established that community banking institutions must maintain a capital conservation buffer of common equity Tier 1 capital in an amount greater than 2.5% of total risk-weighted assets to avoid being subject to limitations on capital distributions and discretionary bonus payments to executive officers. The implementation of the capital conservation buffer began on January 1, 2016 at the 0.625% level and will be phased in over a four-year period (increasing by that amount on each subsequent January 1, until it reaches 2.5% on January 1, 2019). Management believes that as of March 31, 2018 and June 30, 2017, the Bank and Company met all capital adequacy requirements to which they were subject, including the capital conservation buffer of 1.875% and 1.250% as of March 31, 2018 and June 30, 2017, respectively. Further, the most recent FDIC notification categorized the Bank as a well-capitalized institution under the prompt corrective action regulations. There have been no conditions or events since that notification that management believes have changed the Bank’s capital classification.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Note 10. Earnings Per Share Basic earnings per share represents income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Unallocated ESOP shares are not deemed outstanding for earnings per share calculations. There were no potentially dilutive common stock equivalents during the nine months ended March 31, 2018. Earnings per share data is not applicable for the periods ended March 31, 2017 because the Company had not yet been formed and had no shares outstanding at a Company or Bank level. Three Months Ended March 31, 2018 Nine Months Ended March 31, 2018 (amounts in thousands, except share and per share data) Net income applicable to common stock $ 2,177 $ 3,935 Average number of common shares outstanding 18,165,110 18,165,110 Less: Average unallocated ESOP shares 1,344,384 1,375,979 Average number of common shares outstanding used to calculate basic earnings per common share 16,820,726 16,789,131 Earnings per Common share: Basic $ 0.13 $ 0.23 Diluted $ 0.13 $ 0.23

Income Taxes

Income Taxes	9 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 11. Income Taxes On December 22, 2017, as part of the Tax Cuts and Jobs Act, the federal government enacted comprehensive tax reform containing provisions with a number of impacts on corporate income taxes, the most significant of which provides a decrease in the corporate income tax rate from 34% to 21% for tax years beginning on or after January 1, 2018. The Company is required to re-measure as of the date the law is enacted, its net deferred tax assets to reflect the income tax rate expected to be effective when deferred tax positions will be realized. As a result, the Company recorded a re-measurement charge (benefit) through income tax expense of $(182,000) and $1.6 million for the three and nine months ended March 31, 2018, respectively. The Company has finalized its accounting for the impacts of the tax reform and the amounts recorded are no longer considered provisional.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations PCSB Bank is a community-oriented financial institution that provides financial services to individuals and businesses within its market area of Putnam, Southern Dutchess, Rockland and Westchester Counties in New York. The Bank is a state-chartered stock savings bank and its deposits are insured up to applicable limits by the Deposit Insurance Fund of the Federal Deposit Insurance Corporation (“FDIC”). The Bank’s primary regulators are the FDIC and the New York State Department of Financial Services.
Basis of Presentation	Basis of Presentation The unaudited consolidated financial statements contained herein reflect all normal recurring adjustments that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods presented. Such adjustments are the only adjustments reflected in the consolidated financial statements contained herein. The annualized results of operations for the period presented are not necessarily indicative of the results of operations that may be expected for the entire fiscal year. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. The accompanying unaudited financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended June 30, 2017, included in the Company's annual report on Form 10-K.
Use of Estimates	Use of Estimates

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost, Gross Unrealized/Unrecognized Gains and Losses and Fair Value of Available for Sale and Held to Maturity Securities	The amortized cost, gross unrealized/unrecognized gains and losses and fair value of available for sale and held to maturity securities at March 31, 2018 and June 30, 2017 were as follows: March 31, 2018 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 62,437 $ - $ (871 ) $ 61,566 Corporate and other debt securities 8,420 - (157 ) 8,263 Mortgage-backed securities – residential 38,149 123 (812 ) 37,460 Equity securities 32 - - 32 Total available for sale $ 109,038 $ 123 $ (1,840 ) $ 107,321 Held to maturity: U.S. Government and agency obligations $ 132,050 $ - $ (2,153 ) $ 129,897 Corporate and other debt securities 4,000 - (81 ) 3,919 Mortgage-backed securities – residential 141,258 86 (4,070 ) 137,274 Mortgage-backed securities – collateralized mortgage obligations 55,814 - (1,582 ) 54,232 Mortgage-backed securities – commercial 33,240 22 (823 ) 32,439 Total held to maturity $ 366,362 $ 108 $ (8,709 ) $ 357,761 June 30, 2017 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 63,630 $ 31 $ (216 ) $ 63,445 Corporate and other debt securities 8,460 58 (36 ) 8,482 Mortgage-backed securities – residential 39,710 363 (143 ) 39,930 Equity securities 32 - - 32 Total available for sale $ 111,832 $ 452 $ (395 ) $ 111,889 Held to maturity: U.S. Government and agency obligations $ 155,559 $ 23 $ (574 ) $ 155,008 Corporate and other debt securities 999 - - 999 Mortgage-backed securities – residential 143,452 828 (497 ) 143,783 Mortgage-backed securities – collateralized mortgage obligations 59,476 146 (235 ) 59,387 Mortgage-backed securities – commercial 24,065 412 (66 ) 24,411 Total held to maturity $ 383,551 $ 1,409 $ (1,372 ) $ 383,588
Fair Value and Carrying Amount of Debt Securities by Contractual Maturity	The following table presents the fair value and carrying amount of debt securities at March 31, 2018, by contractual maturity. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties. Held to maturity Available for sale Carrying Fair Amortized Fair Amount Value Cost Value (in thousands) March 31, 2018: 1 year or less $ 31,504 $ 31,382 $ 13,404 $ 13,349 1 to 5 years 100,546 98,515 55,453 54,504 5 to 10 years - - 2,000 1,976 Mortgage-backed securities and other 234,312 227,864 38,149 37,460 Total $ 366,362 $ 357,761 $ 109,006 $ 107,289
Investment Securities with Fair Value and Unrealized Losses	The following table provides information regarding investment securities with unrealized/unrecognized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position at March 31, 2018 and June 30, 2017 March 31, 2018 Less than 12 months 12 months or greater Total Unrealized/ Unrealized/ Unrealized/ Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Loss Value Loss Value Loss (in thousands) Available for sale: U.S. Government and agency obligations $ 38,880 $ (492 ) $ 21,686 $ (379 ) $ 60,566 $ (871 ) Corporate and other debt securities 8,262 (157 ) - - 8,262 (157 ) Mortgage-backed securities – residential 22,324 (493 ) 10,101 (319 ) 32,425 (812 ) Total available for sale $ 69,466 $ (1,142 ) $ 31,787 $ (698 ) $ 101,253 $ (1,840 ) Held to maturity: U.S. Government and agency obligations $ 66,915 $ (1,117 ) $ 62,982 $ (1,036 ) 129,897 $ (2,153 ) Corporate and other debt securities 3,919 (81 ) - - 3,919 (81 ) Mortgage-backed securities – residential 110,055 (2,901 ) 25,580 (1,169 ) 135,635 (4,070 ) Mortgage-backed securities – collateralized mortgage obligations 43,000 (1,099 ) 11,232 (483 ) 54,232 (1,582 ) Mortgage-backed securities – commercial 20,038 (464 ) 8,698 (359 ) 28,736 (823 ) Total held to maturity $ 243,927 $ (5,662 ) $ 108,492 $ (3,047 ) $ 352,419 $ (8,709 ) June 30, 2017 Less than 12 months 12 months or greater Total Unrealized/ Unrealized/ Unrealized/ Fair Unrecognized Fair Unrecognized Fair Unrecognized Value Loss Value Loss Value Loss (in thousands) Available for sale U.S. Government and agency obligations $ 41,900 $ (200 ) $ 3,993 $ (16 ) $ 45,893 $ (216 ) Corporate and other debt securities 1,964 (36 ) - - 1,964 (36 ) Mortgage-backed securities – residential 18,861 (111 ) 3,200 (32 ) 22,061 (143 ) Total available for sale $ 62,725 $ (347 ) $ 7,193 $ (48 ) $ 69,918 $ (395 ) Held to maturity U.S. Government and agency obligations $ 113,511 $ (531 ) $ 5,981 $ (43 ) $ 119,492 $ (574 ) Corporate and other debt securities 999 - - - 999 - Mortgage-backed securities – residential 39,754 (467 ) 1,626 (30 ) 41,380 (497 ) Mortgage-backed securities – collateralized mortgage obligations 26,622 (141 ) 4,444 (94 ) 31,066 (235 ) Mortgage-backed securities – commercial 9,092 (66 ) - - 9,092 (66 ) Total held to maturity $ 189,978 $ (1,205 ) $ 12,051 $ (167 ) $ 202,029 $ (1,372 )

Loans Receivable (Tables)

Loans Receivable (Tables)	9 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable are summarized as follows (in thousands): March 31, June 30, 2018 2017 Mortgage loans: Residential $ 253,847 $ 217,778 Commercial 484,810 437,651 Construction 16,098 22,404 Net deferred loan origination costs 1,203 397 Total mortgages 755,958 678,230 Commercial and consumer loans: Commercial loans 35,897 33,297 Other loans secured 47,770 46,802 Home equity lines of credit 38,220 41,927 Consumer and installment loans 12,773 13,765 Net deferred loan origination costs 724 777 Total commercial and consumer loans 135,384 136,568 Total loans receivable 891,342 814,798 Allowance for loan losses (4,624 ) (5,150 ) Loans receivable, net $ 886,718 $ 809,648
Summary of Activity in Allowance for Loan Losses by Portfolio Segment	The following tables present the activity in the allowance for loan losses by portfolio segment for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three Months Ended March 31, 2018 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 402 $ (20 ) $ (47 ) $ - $ 335 Commercial 2,686 131 - - 2,817 Construction 400 90 - - 490 Commercial loans 322 2 - - 324 Other loans secured 389 (180 ) (13 ) 210 406 Home equity lines of credit 74 35 (60 ) 19 68 Consumer and installment loans 133 (4 ) (10 ) - 119 Acquired: Residential 65 - - - 65 Total $ 4,471 $ 54 $ (130 ) $ 229 $ 4,624 Three Months Ended March 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 238 $ 158 $ (15 ) $ - $ 381 Commercial 3,031 (621 ) - - 2,410 Construction 336 552 - - 888 Commercial loans 501 48 - - 549 Other loans secured 339 31 - - 370 Home equity lines of credit 70 3 - - 73 Consumer and installment loans 113 61 (19 ) 4 159 Acquired: Commercial loans - 3 (3 ) - - Total $ 4,628 $ 235 $ (37 ) $ 4 $ 4,830
Summary of Balance in Allowance for Loan Losses and Recorded investment in Loans by Portfolio Segment, and Based on Impairment Method	The following tables present the balance in the allowance for loan losses and the recorded investment in loans, excluding net deferred fees and accrued interest, by portfolio segment, and based on impairment method as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 Loans Allowance for Loan Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Residential $ 2,879 $ 249,655 $ 1,313 $ 253,847 $ 127 $ 208 $ 65 $ 400 Commercial 2,440 480,887 1,483 484,810 - 2,817 - 2,817 Construction 2,260 13,838 - 16,098 276 214 - 490 Commercial loans 349 35,548 - 35,897 8 316 - 324 Other loans secured 3,973 43,797 - 47,770 1 405 - 406 Home equity lines of credit 416 37,633 171 38,220 5 63 - 68 Consumer and installment loans - 12,773 - 12,773 - 119 - 119 Total $ 12,317 $ 874,131 $ 2,967 $ 889,415 $ 417 $ 4,142 $ 65 $ 4,624 June 30, 2017 Loans Allowance for Loan Losses Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Acquired With Deteriorated Credit Quality Total Residential $ 4,471 $ 211,983 $ 1,324 $ 217,778 $ 131 $ 229 $ 26 $ 386 Commercial 2,411 433,416 1,824 437,651 - 2,589 - 2,589 Construction 3,661 18,743 - 22,404 997 153 - 1,150 Commercial loans 356 32,941 - 33,297 7 433 - 440 Other loans secured 5,813 40,989 - 46,802 2 363 - 365 Home equity lines of credit 610 41,140 177 41,927 5 71 - 76 Consumer and installment loans - 13,723 42 13,765 - 144 - 144 Total $ 17,322 $ 792,935 $ 3,367 $ 813,624 $ 1,142 $ 3,982 $ 26 $ 5,150
Summary of Loans Individually Evaluated for Impairment (Excluding Loans Acquired with Deteriorated Credit Quality) by Class of Loans	The following tables present information related to loans individually evaluated for impairment (excluding loans acquired with deteriorated credit quality) by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 2,698 $ 2,428 $ - Commercial 2,946 2,440 - Other loans secured 7,163 2,916 - Home equity lines of credit 471 405 - With a related allowance recorded: Residential 390 451 127 Construction 3,257 2,260 276 Commercial loans 349 349 8 Other loans secured 1,057 1,057 1 Home equity lines of credit 11 11 5 Total $ 18,342 $ 12,317 $ 417 June 30, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 4,216 $ 4,014 $ - Commercial 2,935 2,411 - Construction 404 404 - Commercial loans 276 277 - Other loans secured 9,157 4,702 - Home equity lines of credit 599 599 - With a related allowance recorded: Residential 395 457 131 Construction 3,257 3,257 997 Commercial loans 79 79 7 Other loans secured 1,111 1,111 2 Home equity lines of credit 11 11 5 Total $ 22,440 $ 17,322 $ 1,142
Summary of Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment, by Class of Loans	The table below presents the average recorded investment and interest income recognized on loans individually evaluated for impairment, by class of loans, for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three months ended Three months ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 2,776 $ 13 $ 3,048 $ - Commercial 2,440 37 2,287 32 Commercial loans - - 89 1 Other loans secured 3,027 68 4,804 53 Home equity lines of credit 452 - 599 - With a related allowance recorded: Residential 452 4 517 4 Construction 2,260 - 3,388 - Commercial loans 350 1 - - Other loans secured 1,067 13 1,129 14 Home equity lines of credit 11 - 11 - Total $ 12,835 $ 136 $ 15,872 $ 104 Nine Months Ended Nine Months Ended March 31, 2018 March 31, 2017 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,360 $ 179 $ 3,078 $ - Commercial 2,447 91 2,303 95 Construction 121 17 - - Commercial loans - - 91 3 Other loans secured 3,704 228 4,846 172 Home equity lines of credit 549 20 599 (2 ) With a related allowance recorded: Residential 454 11 513 14 Construction 2,858 - 3,073 71 Commercial loans 353 5 - - Other loans secured 1,086 40 1,141 43 Home equity lines of credit 11 - 11 - Total $ 14,943 $ 591 $ 15,655 $ 396
Nonaccrual Loans and in Loans Past Due over 90 Days Still on Accrual Status by Class of Loans	The following table presents the recorded investment in nonaccrual loans and in loans past due over 90 days and still on accrual status, by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): Loans Past Due Over 90 Days Nonaccrual and Still Accruing March 31, June 30, March 31, June 30, 2018 2017 2018 2017 Originated: Residential $ 1,129 $ 2,581 $ - $ - Commercial 262 - - - Construction 2,260 3,661 - - Commercial loans 275 - - - Other loans secured 1,307 2,959 - - Home equity lines of credit 100 302 - - Acquired: Residential 1,299 1,776 - - Commercial 508 497 - - Home equity lines of credit 304 296 - - Total $ 7,444 $ 12,072 $ - $ -
Aging of Recorded Investment in Past Due Loans by Class of Loans	The following tables present the aging of the recorded investment in past due loans by class of loans as of March 31, 2018 and June 30, 2017 (in thousands): March 31, 2018 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ - $ - $ 736 $ 736 $ 195,610 $ 196,346 Commercial 775 - 262 1,037 407,747 408,784 Construction - - 2,260 2,260 13,838 16,098 Commercial loans - - 275 275 35,033 35,308 Other loans secured - - 500 500 47,140 47,640 Home equity lines of credit - - 100 100 32,646 32,746 Consumer and installment loans - - - - 12,624 12,624 Total originated 775 - 4,133 4,908 744,638 749,546 Acquired: Residential 233 - 1,797 2,030 55,471 57,501 Commercial - - 1,087 1,087 74,939 76,026 Commercial loans - - - - 589 589 Other loans secured - - - - 130 130 Home equity lines of credit 23 - 296 319 5,155 5,474 Consumer and installment loans - - - - 149 149 Total acquired 256 - 3,180 3,436 136,433 139,869 Total $ 1,031 $ - $ 7,313 $ 8,344 $ 881,071 $ 889,415 June 30, 2017 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ 94 $ 275 $ 1,973 $ 2,342 $ 153,390 $ 155,732 Commercial - - - - 355,247 355,247 Construction - - 3,661 3,661 18,743 22,404 Commercial loans - - - - 31,613 31,613 Other loans secured - - 544 544 43,612 44,156 Home equity lines of credit - 199 103 302 35,246 35,548 Consumer and installment loans - - - - 13,435 13,435 Total originated 94 474 6,281 6,849 651,286 658,135 Acquired: Residential 237 463 1,472 2,172 59,874 62,046 Commercial - - 1,054 1,054 81,350 82,404 Commercial loans - - - - 1,684 1,684 Other loans secured - - - - 2,646 2,646 Home equity lines of credit - - 296 296 6,083 6,379 Consumer and installment loans - - - - 330 330 Total acquired 237 463 2,822 3,522 151,967 155,489 Total $ 331 $ 937 $ 9,103 $ 10,371 $ 803,253 $ 813,624
Summary of Risk Category of Loans by Class of Loans	Based on the most recent analysis performed, the risk category of loans by class of loans is as follows (in thousands): March 31, 2018 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 194,594 $ 548 $ 1,204 $ - $ 196,346 Commercial 405,696 - 3,088 - 408,784 Construction 13,838 - 2,260 - 16,098 Commercial loans 32,647 - 2,661 - 35,308 Other loans secured 42,606 - 5,034 - 47,640 Home equity lines of credit 32,599 102 45 - 32,746 Consumer and installment loans 12,624 - - - 12,624 Total originated 734,604 650 14,292 - 749,546 Acquired: Residential 54,367 253 2,881 - 57,501 Commercial 72,565 1,470 1,991 - 76,026 Commercial loans 589 - - - 589 Other loans secured 116 14 - - 130 Home equity lines of credit 5,074 - 400 - 5,474 Consumer and installment loans 149 - - - 149 Total acquired 132,860 1,737 5,272 - 139,869 Total $ 867,464 $ 2,387 $ 19,564 $ - $ 889,415 June 30, 2017 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 153,165 $ - $ 2,567 $ - $ 155,732 Commercial 352,203 134 2,910 - 355,247 Construction 18,743 - 3,661 - 22,404 Commercial loans 28,944 - 2,669 - 31,613 Other loans secured 37,267 - 6,889 - 44,156 Home equity lines of credit 35,246 58 244 - 35,548 Consumer and installment loans 13,405 - 30 - 13,435 Total originated 638,973 192 18,970 - 658,135 Acquired: Residential 58,665 - 3,381 - 62,046 Commercial 80,082 - 2,322 - 82,404 Commercial loans 1,684 - - - 1,684 Other loans secured 2,646 - - - 2,646 Home equity lines of credit 5,906 - 473 - 6,379 Consumer and installment loans 330 - - - 330 Total acquired 149,313 - 6,176 - 155,489 Total $ 788,286 $ 192 $ 25,146 $ - $ 813,624
Schedule of Carrying Amount of Purchased Credit Impaired Loans	The carrying amount of those loans as of March 31, 2018 and June 30, 2017 is as follows (in thousands): March 31, June 30, 2018 2017 Residential $ 1,248 $ 1,298 Commercial 1,483 1,824 Home equity lines of credit 171 177 Consumer and installment loans - 42 Carrying amount, net of allowance of $65 and $26, respectively $ 2,902 $ 3,341
Summary of Accretable Yield, or Income Expected to be Collected for Acquired Loans	Accretable yield, or income expected to be collected, for acquired loans is as follows (in thousands): Three Months Ended March 31, Nine Months Ended March 31, 2018 2017 2018 2017 Beginning balance $ 238 $ 486 $ 403 $ 578 New loans acquired - - - - Accretion income (7 ) (47 ) (59 ) (139 ) Reclassification from non-accretable difference - - - - Disposals - - (113 ) - Ending balance $ 231 $ 439 $ 231 $ 439

Other Comprehensive Income (L23

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Summary of Accumulated Other Comprehensive Income (Loss)	The following is a summary of the accumulated other comprehensive income (loss) balances, net of tax (in thousands): Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at January 1, 2018 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) Other comprehensive loss before reclassifications (705 ) - - (705 ) Amounts reclassified from accumulated other comprehensive income - 182 10 192 Tax effect 149 (39 ) (3 ) 107 Net other comprehensive (loss) income (556 ) 143 7 (406 ) Reclassification of certain tax effects on other comprehensive income ( 1) (132 ) (938 ) (47 ) (1,117 ) Balance at March 31, 2018 $ (1,357 ) $ (5,558 ) $ (278 ) $ (7,193 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at January 1, 2017 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 ) Other comprehensive income before reclassifications 319 4,357 - 4,676 Amounts reclassified from accumulated other comprehensive income - (727 ) 24 (703 ) Tax effect (109 ) (1,233 ) (9 ) (1,351 ) Net other comprehensive income 210 2,397 15 2,622 Balance at March 31, 2017 $ 1 $ (4,905 ) $ (764 ) $ (5,668 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at July 1, 2017 $ 37 $ (5,002 ) $ (250 ) $ (5,215 ) Other comprehensive loss before reclassifications (1,635 ) - - (1,635 ) Amounts reclassified from accumulated other comprehensive income (139 ) 544 26 431 Tax effect 512 (162 ) (7 ) 343 Net other comprehensive (loss) income (1,262 ) 382 19 (861 ) Reclassification of certain tax effects on other comprehensive income ( 1) (132 ) (938 ) (47 ) (1,117 ) Balance at March 31, 2018 $ (1,357 ) $ (5,558 ) $ (278 ) $ (7,193 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at July 1, 2016 $ 523 $ (7,683 ) $ (810 ) $ (7,970 ) Other comprehensive (loss) income before reclassifications (790 ) 4,357 - 3,567 Amounts reclassified from accumulated other comprehensive income - (149 ) 70 (79 ) Tax effect 268 (1,430 ) (24 ) (1,186 ) Net other comprehensive (loss) income (522 ) 2,778 46 2,302 Balance at March 31, 2017 $ 1 $ (4,905 ) $ (764 ) $ (5,668 ) (1) Represents the impact of adopting ASU 2018-02 requiring the reclassification of certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act of 2017 (or portion thereof) is recorded. The amount of the reclassification is the difference between the historical corporate income tax rate (34 percent) and the newly enacted 21 percent corporate income tax rate. The reclassification is as of March 31, 2018; no prior period information has been retroactively adjusted as a result of implementing the ASU.

Post-Retirement Benefits (Table

Post-Retirement Benefits (Tables)	9 Months Ended
	Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income	Net periodic benefit cost and other amounts recognized in other comprehensive income for the three and nine months ended March 31, 2018 and 2017 (in thousands): Three Months Ended Three Months Ended March 31, 2018 March 31, 2017 Defined Benefit Plan Supplemental Retirement Plans Defined Benefit Plan Supplemental Retirement Plans Service cost $ - $ 149 $ 150 $ 100 Interest cost 242 26 250 32 Expected return on plan assets (505 ) - (462 ) - Amortization of prior net loss - - 300 23 Amortization of prior service cost 182 10 (48 ) - Gain on curtailment - - (919 ) - Net periodic (benefit) cost $ (81 ) $ 185 $ (729 ) $ 155 Nine Months Ended Nine Months Ended March 31, 2018 March 31, 2017 Defined Benefit Plan Supplemental Retirement Plan Defined Benefit Plan Supplemental Retirement Plan Service cost $ - $ 369 $ 519 $ 261 Interest cost 726 76 757 91 Expected return on plan assets (1,511 ) - (1,424 ) - Amortization of prior net loss - - 1,021 70 Amortization of prior service cost 544 26 (192 ) - Gain on curtailment - - (919 ) - Net periodic cost $ (241 ) $ 471 $ (238 ) $ 422
Shares Held by ESOP	Shares held by the ESOP include the following: March 31, 2018 June 30, 2017 Allocated 96,881 - Committed to be allocated 23,888 26,975 Unallocated 1,332,440 1,426,234 Total shares 1,453,209 1,453,209

Fair Value of Financial Instr25

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Measured at Fair Value	Assets and liabilities measured at fair value are summarized below (in thousands): Fair Value Measurements Level 1 Level 2 Level 3 Total March 31, 2018 Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 61,566 $ - $ 61,566 Corporate and other debt securities - 8,263 - 8,263 Mortgage-backed securities – residential - 37,460 - 37,460 Equity securities - 32 - 32 Total assets at fair value $ - $ 107,321 $ - $ 107,321 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 399 $ 399 Construction - - 1,984 1,984 Commercial loans - - 286 286 Other loans secured - - 500 500 Home equity lines of credit - - 6 6 Foreclosed real estate - - 144 144 Total assets at fair value $ - $ - $ 3,319 $ 3,319 Fair Value Measurements Level 1 Level 2 Level 3 Total June 30, 2017 Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 63,445 $ - $ 63,445 Corporate and other debt securities - 8,482 - 8,482 Mortgage-backed securities – residential - 39,930 - 39,930 Equity securities - 32 - 32 Total assets at fair value $ - $ 111,889 $ - $ 111,889 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 1,126 $ 1,126 Construction - - 2,260 2,260 Commercial loans - - 72 72 Other loans secured - - 1,609 1,609 Home equity lines of credit - - 5 5 Foreclosed real estate - - 977 977 Total assets at fair value $ - $ - $ 6,049 $ 6,049
Summary of Quantitative Information about Level 3 Fair Value Measurements for Selected Financial Instruments Measured at Fair Value on Non-recurring Basis	The following tables present quantitative information about Level 3 fair value measurements for selected financial instruments measured at fair value on a non-recurring basis at March 31, 2018 and June 30, 2017 (dollars in thousands): Valuation Unobservable Range or Fair Value Technique(s) Input(s) Rate Used March 31, 2018: Impaired loans - residential mortgages $ 399 Sales comparison Adjustments for differences in sales comparables -3.3% to 21.1% Impaired loans - construction 1,984 Sales contract Discount to sales contract 10.0% Impaired loans - commercial loans 286 Discounted cash flow Discount rate 5.3% Impaired loans - other loans secured 500 Sales contract Discount to sales contract 10.0% Impaired loans - home equity lines of credit 6 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% Foreclosed real estate 144 Sales comparison Adjustments for differences in sales comparables -40.0% to 8.8% June 30, 2017: Impaired loans - residential mortgages $ 1,126 Sales comparison Adjustments for differences in sales comparables -5.1% to 7.8% Discounted cash flow Discount rate 5.4% to 6.3% Impaired loans - construction 2,260 Cost approach Discount for distressed property 50.0% Impaired loans - commercial 72 Discounted cash flow Adjustments for differences in sales comparables 7.0% to 7.5% Impaired loans - other loans secured 1,609 Discounted cash flow Discount rate 6.0% Sales comparison Adjustments for differences in sales comparables 0.0% Impaired loans - home equity lines of credit 5 Discounted cash flow Discount rate 6.3% Foreclosed real estate 977 Sales comparison Adjustments for differences in sales comparables -23.4% to 7.2%
Summary of Carrying Amounts and Estimated Fair Values of Bank's Financial Assets and Liabilities	The following is a summary of the carrying amounts and estimated fair values of the Company’s financial assets and liabilities (in thousands) (none of which are held for trading purposes): Carrying Fair Value Measurements Amount Level 1 Level 2 Level 3 Total March 31, 2018: Financial assets: Cash and cash equivalents $ 36,505 $ 36,505 $ - $ - $ 36,505 Investment securities held to maturity 366,362 - 357,648 113 357,761 Investment securities available for sale 107,321 - 107,321 - 107,321 Loans receivable, net 886,718 - - 873,570 873,570 Accrued interest receivable 4,458 - 1,580 2,878 4,458 Federal Home Loan Bank stock 4,112 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 765,560 765,560 - - 765,560 Time deposits 322,425 - 324,732 - 324,732 Mortgage escrow funds 7,596 7,596 - - 7,596 FHLB advances 68,872 - 68,681 - 68,681 June 30, 2017: Financial assets: Cash and cash equivalents $ 60,486 $ 60,486 $ - $ - $ 60,486 Investment securities held to maturity 383,551 - 383,318 270 383,588 Investment securities available for sale 111,889 - 111,889 - 111,889 Loans receivable, net 809,648 - - 817,814 817,814 Accrued interest receivable 3,693 - 1,243 2,450 3,693 Federal Home Loan Bank stock 3,132 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 793,681 793,681 - - 793,681 Time deposits 294,780 - 297,508 - 297,508 Mortgage escrow funds 8,084 8,084 - - 8,084 FHLB advances 42,598 - 45,504 - 45,504

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended
	Mar. 31, 2018
Banking And Thrift [Abstract]
Summary of Company's and Bank's Actual Capital Amounts and Ratios Compared to Required Ratios for Minimum Capital Adequacy and for Classification as Well Capitalized	The following is a summary of the Company’s and Bank’s actual capital amounts and ratios as of March 31, 2018 and June 30, 2017, compared to the required ratios for minimum capital adequacy and for classification as well capitalized (dollars in thousands): To Be Well Capitalized Under Prompt For Capital Adequacy Corrective Action Bank Actual Purposes Provisions Amount Ratio Amount Ratio Amount Ratio March 31, 2018: PCSB Bank Leverage (Tier 1) $ 202,158 14.0 % $ 56,557 4.0 % $ 70,696 5.0 % Risk-based: Common Tier 1 202,158 21.2 42,015 4.5 60,688 6.5 Tier 1 202,158 21.2 56,020 6.0 74,693 8.0 Total 197,534 21.7 74,693 8.0 93,366 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 285,305 20.2 % $ 56,612 4.0 % N/A N/A Risk-based: Common Tier 1 285,305 30.5 42,056 4.5 N/A N/A Tier 1 285,305 30.5 56,075 6.0 N/A N/A Total 289,929 31.0 74,766 8.0 N/A N/A June 30, 2017: PCSB Bank Leverage (Tier 1) $ 190,990 13.7 % $ 55,949 4.0 % $ 69,936 5.0 % Risk-based: Common Tier 1 190,990 21.7 39,631 4.5 57,245 6.5 Tier 1 190,990 21.7 52,841 6.0 70,455 8.0 Total 196,140 22.3 70,455 8.0 88,069 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 278,528 20.0 % $ 55,839 4.0 % N/A N/A Risk-based: Common Tier 1 278,528 31.6 39,631 4.5 N/A N/A Tier 1 278,528 31.6 52,841 6.0 N/A N/A Total 283,678 32.2 70,455 8.0 N/A N/A

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	Three Months Ended March 31, 2018 Nine Months Ended March 31, 2018 (amounts in thousands, except share and per share data) Net income applicable to common stock $ 2,177 $ 3,935 Average number of common shares outstanding 18,165,110 18,165,110 Less: Average unallocated ESOP shares 1,344,384 1,375,979 Average number of common shares outstanding used to calculate basic earnings per common share 16,820,726 16,789,131 Earnings per Common share: Basic $ 0.13 $ 0.23 Diluted $ 0.13 $ 0.23

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2018Subsidiary
Basis Of Presentation [Abstract]
Number of subsidiaries	3

Recent Accounting Pronounceme29

Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands		Dec. 22, 2017	Dec. 21, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Corporate income tax rate		21.00%	34.00%	21.00%	34.00%
Retained Earnings [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of certain tax effects on other comprehensive income	[1]					$ 1,117
Accumulated Other Comprehensive Loss [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification of certain tax effects on other comprehensive income				$ (1,117)		$ (1,117)	[1]
[1]	The adoption of ASU 2018-02 requires the reclassification from accumulated other comprehensive income to retained earnings of certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017. Refer to Footnote 2 - Recent Accounting Pronouncements for additional information

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Apr. 20, 2017	Mar. 31, 2018	Jun. 30, 2017	Apr. 19, 2017	Mar. 31, 2017
Subsidiary Sale Of Stock [Line Items]
Initial public offering in connection with banks's mutual-to-stock conversion completion date	Apr. 20, 2017
Gross proceeds from offering	$ 178.3
Sale of stock	17,826,408
Expenses related to offering	$ 3.7
Net proceeds from offering	174.6
ESOP borrowing		$ 13.6
Net proceeds from offering amount contributed to bank	$ 87.3
Common Stock, shares outstanding		18,165,110	18,165,110	0	0
PCSB Bank Employee Stock Ownership Plan [Member]
Subsidiary Sale Of Stock [Line Items]
Sale of stock	1,453,209
Stock price	$ 10
ESOP borrowing	$ 14.5
PCSB Community Foundation [Member]
Subsidiary Sale Of Stock [Line Items]
Contributions in shares	338,702
Contributions in cash	$ 1.6

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost, Gross Unrealized/Unrecognized Gains and Losses and Fair Value of Available for Sale and Held to Maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	$ 109,038	$ 111,832
Available for sale, Gross Unrealized/Unrecognized Gains	123	452
Available for sale, Gross Unrealized/Unrecognized Losses	(1,840)	(395)
Available for sale, Fair Value	107,321	111,889
Held to maturity, Amortized Cost	366,362	383,551
Held to maturity, Gross Unrealized/Unrecognized Gains	108	1,409
Held to maturity, Gross Unrealized/Unrecognized Losses	(8,709)	(1,372)
Held to maturity, Fair Value	357,761	383,588
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	62,437	63,630
Available for sale, Gross Unrealized/Unrecognized Gains		31
Available for sale, Gross Unrealized/Unrecognized Losses	(871)	(216)
Available for sale, Fair Value	61,566	63,445
Held to maturity, Amortized Cost	132,050	155,559
Held to maturity, Gross Unrealized/Unrecognized Gains		23
Held to maturity, Gross Unrealized/Unrecognized Losses	(2,153)	(574)
Held to maturity, Fair Value	129,897	155,008
Corporate and Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	8,420	8,460
Available for sale, Gross Unrealized/Unrecognized Gains		58
Available for sale, Gross Unrealized/Unrecognized Losses	(157)	(36)
Available for sale, Fair Value	8,263	8,482
Held to maturity, Amortized Cost	4,000	999
Held to maturity, Gross Unrealized/Unrecognized Losses	(81)
Held to maturity, Fair Value	3,919	999
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	38,149	39,710
Available for sale, Gross Unrealized/Unrecognized Gains	123	363
Available for sale, Gross Unrealized/Unrecognized Losses	(812)	(143)
Available for sale, Fair Value	37,460	39,930
Held to maturity, Amortized Cost	141,258	143,452
Held to maturity, Gross Unrealized/Unrecognized Gains	86	828
Held to maturity, Gross Unrealized/Unrecognized Losses	(4,070)	(497)
Held to maturity, Fair Value	137,274	143,783
Equity Securities [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	32	32
Available for sale, Fair Value	32	32
Mortgage-backed Securities - Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Held to maturity, Amortized Cost	55,814	59,476
Held to maturity, Gross Unrealized/Unrecognized Gains		146
Held to maturity, Gross Unrealized/Unrecognized Losses	(1,582)	(235)
Held to maturity, Fair Value	54,232	59,387
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Held to maturity, Amortized Cost	33,240	24,065
Held to maturity, Gross Unrealized/Unrecognized Gains	22	412
Held to maturity, Gross Unrealized/Unrecognized Losses	(823)	(66)
Held to maturity, Fair Value	$ 32,439	$ 24,411

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)	Mar. 31, 2018USD ($)Security	Mar. 31, 2017USD ($)	Jun. 30, 2017USD ($)Security
Schedule of Investments [Line Items]
Sale of investment securities		$ 6,600,000
Realized gains or losses on investment securities	$ 0	173,000	$ 0
Disposal of securities held to maturity		681,000
Realized gains from sale of securities held to maturity		34,000
Carrying amounts of securities pledged		129,600,000		$ 95,500,000
Total investment securities		$ 473,683,000		$ 495,440,000
Number of securities in unrealized loss position | Security		256		156
Fair value of securities in unrealized loss position		$ 453,700,000		$ 271,900,000
Other-than-temporarily impaired securities		$ 0		$ 0
Minimum [Member]
Schedule of Investments [Line Items]
Held to maturity substantial portion of principal outstanding percentage		85.00%

Investment Securities - Fair Va

Investment Securities - Fair Value and Carrying Amount of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]
Held to maturity, carrying amount, 1 year or less	$ 31,504
Held to maturity, carrying amount, 1 to 5 years	100,546
Held to maturity, carrying amount, Mortgage-backed securities and other	234,312
Held to maturity, Amortized Cost	366,362	$ 383,551
Held to maturity, fair value, 1 year or less	31,382
Held to maturity, fair value, 1 to 5 years	98,515
Held to maturity, fair value, Mortgage-backed securities and other	227,864
Held to maturity, fair value, Total	357,761	$ 383,588
Available for sale, amortized cost, 1 year or less	13,404
Available for sale, amortized cost, 1 to 5 years	55,453
Available for sale, amortized cost, 5 to 10 years	2,000
Available for sale, amortized cost, Mortgage-backed securities and other	38,149
Available for sale, amortized cost, Total	109,006
Available for sale, fair value, 1 year or less	13,349
Available for sale, fair value, 1 to 5 years	54,504
Available for sale, fair value, 5 to 10 years	1,976
Available for sale, fair value, Mortgage-backed securities and other	37,460
Available for sale, fair value, Total	$ 107,289

Investment Securities - Investm

Investment Securities - Investment Securities with Fair Value and Unrealized Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	$ 69,466	$ 62,725
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(1,142)	(347)
Available for sale, 12 months or greater, Fair Value	31,787	7,193
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(698)	(48)
Available for sale, Total, Fair Value	101,253	69,918
Available for sale, Total, Unrealized/Unrecognized Loss	(1,840)	(395)
Held to maturity, Less than 12 months, Fair Value	243,927	189,978
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(5,662)	(1,205)
Held to maturity, 12 months or greater, Fair Value	108,492	12,051
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(3,047)	(167)
Held to maturity, Total, Fair Value	352,419	202,029
Held to maturity, Total, Unrealized/ Unrecognized Loss	(8,709)	(1,372)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	38,880	41,900
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(492)	(200)
Available for sale, 12 months or greater, Fair Value	21,686	3,993
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(379)	(16)
Available for sale, Total, Fair Value	60,566	45,893
Available for sale, Total, Unrealized/Unrecognized Loss	(871)	(216)
Held to maturity, Less than 12 months, Fair Value	66,915	113,511
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(1,117)	(531)
Held to maturity, 12 months or greater, Fair Value	62,982	5,981
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(1,036)	(43)
Held to maturity, Total, Fair Value	129,897	119,492
Held to maturity, Total, Unrealized/ Unrecognized Loss	(2,153)	(574)
Corporate and Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	8,262	1,964
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(157)	(36)
Available for sale, Total, Fair Value	8,262	1,964
Available for sale, Total, Unrealized/Unrecognized Loss	(157)	(36)
Held to maturity, Less than 12 months, Fair Value	3,919	999
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(81)
Held to maturity, Total, Fair Value	3,919	999
Held to maturity, Total, Unrealized/ Unrecognized Loss	(81)
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	22,324	18,861
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(493)	(111)
Available for sale, 12 months or greater, Fair Value	10,101	3,200
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(319)	(32)
Available for sale, Total, Fair Value	32,425	22,061
Available for sale, Total, Unrealized/Unrecognized Loss	(812)	(143)
Held to maturity, Less than 12 months, Fair Value	110,055	39,754
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(2,901)	(467)
Held to maturity, 12 months or greater, Fair Value	25,580	1,626
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(1,169)	(30)
Held to maturity, Total, Fair Value	135,635	41,380
Held to maturity, Total, Unrealized/ Unrecognized Loss	(4,070)	(497)
Mortgage-backed Securities - Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Held to maturity, Less than 12 months, Fair Value	43,000	26,622
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(1,099)	(141)
Held to maturity, 12 months or greater, Fair Value	11,232	4,444
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(483)	(94)
Held to maturity, Total, Fair Value	54,232	31,066
Held to maturity, Total, Unrealized/ Unrecognized Loss	(1,582)	(235)
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Held to maturity, Less than 12 months, Fair Value	20,038	9,092
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(464)	(66)
Held to maturity, 12 months or greater, Fair Value	8,698
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(359)
Held to maturity, Total, Fair Value	28,736	9,092
Held to maturity, Total, Unrealized/ Unrecognized Loss	$ (823)	$ (66)

Loans Receivable - Summary of L

Loans Receivable - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	$ 889,415		$ 813,624
Loans receivable	891,342		814,798
Allowance for loan losses	(4,624)	$ (4,471)	(5,150)	$ (4,830)	$ (4,628)	$ (4,042)
Loans receivable, net	886,718		809,648
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	253,847		217,778
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	484,810		437,651
Allowance for loan losses	(2,817)		(2,589)
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	16,098		22,404
Allowance for loan losses	(490)		(1,150)
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	35,897		33,297
Allowance for loan losses	(324)		(440)
Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	47,770		46,802
Allowance for loan losses	(406)		(365)
Home Equity Lines Of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	38,220		41,927
Allowance for loan losses	(68)		(76)
Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	12,773		13,765
Allowance for loan losses	(119)		(144)
Mortgage Receivable
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan origination costs	1,203		397
Loans receivable	755,958		678,230
Commercial And Consumer Loan
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan origination costs	724		777
Loans receivable	$ 135,384		$ 136,568

Loans Receivable - Additional I

Loans Receivable - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Mar. 31, 2018USD ($)Loan	Mar. 31, 2017USD ($)Loan	Mar. 31, 2018USD ($)Loan	Mar. 31, 2017USD ($)Loan	Jun. 30, 2017USD ($)Loan
Loans and Leases Receivable Disclosure [Line Items]
Purchased whole loans and loan participations			$ 88,605,000	$ 12,069,000
Nonaccrual acquired loans accounted for as purchased credit impaired loans	$ 1,800,000		$ 1,800,000		$ 2,700,000
Number of loans classified as troubled debt restructurings | Loan	16		16		20
Value of loans classified as troubled debt restructurings	$ 7,000,000		$ 7,000,000		$ 9,900,000
Specific reserves	$ 141,000		$ 141,000		$ 145,000
Troubled debt restructurings, number of modified loans | Loan		1		1
Troubled debt restructurings for which there was a payment default | Loan	0	2	2	2
Troubled debt restructurings with carrying amount		$ 929,000	$ 1,100,000	$ 929,000
Increase allowance for loan loss		$ 0	2,000	$ 0
Troubled debt restructurings with carrying amount cured			$ 807,000
Troubled debt restructurings for which there was a payment default cured | Loan			1
Increase in allowance for loan loss on purchased credit impaired loans			$ 39,000
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Purchased whole loans and loan participations			46,400,000
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Purchased whole loans and loan participations			$ 42,200,000

Loans Receivable - Summary of A

Loans Receivable - Summary of Activity in Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	$ 4,471	$ 4,628	$ 5,150	$ 4,042
Allowance for Loan Losses, Provision (credit)	54	235	389	823
Allowance for Loan Losses, Charge-offs	(130)	(37)	(1,144)	(799)
Allowance for Loan Losses, Recoveries	229	4	229	764
Allowance for Loan Losses, Ending Allowance	4,624	4,830	4,624	4,830
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			2,589
Allowance for Loan Losses, Ending Allowance	2,817		2,817
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			1,150
Allowance for Loan Losses, Ending Allowance	490		490
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			440
Allowance for Loan Losses, Ending Allowance	324		324
Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			365
Allowance for Loan Losses, Ending Allowance	406		406
Home Equity Lines Of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			76
Allowance for Loan Losses, Ending Allowance	68		68
Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			144
Allowance for Loan Losses, Ending Allowance	119		119
Originated [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	402	238	360	237
Allowance for Loan Losses, Provision (credit)	(20)	158	39	89
Allowance for Loan Losses, Charge-offs	(47)	(15)	(64)	(15)
Allowance for Loan Losses, Recoveries				70
Allowance for Loan Losses, Ending Allowance	335	381	335	381
Originated [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	2,686	3,031	2,589	2,149
Allowance for Loan Losses, Provision (credit)	131	(621)	228	242
Allowance for Loan Losses, Recoveries				19
Allowance for Loan Losses, Ending Allowance	2,817	2,410	2,817	2,410
Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	400	336	1,150	269
Allowance for Loan Losses, Provision (credit)	90	552	337	619
Allowance for Loan Losses, Charge-offs			(997)
Allowance for Loan Losses, Ending Allowance	490	888	490	888
Originated [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	322	501	440	604
Allowance for Loan Losses, Provision (credit)	2	48	(116)	(628)
Allowance for Loan Losses, Recoveries				573
Allowance for Loan Losses, Ending Allowance	324	549	324	549
Originated [Member] | Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	389	339	365	397
Allowance for Loan Losses, Provision (credit)	(180)	31	(156)	199
Allowance for Loan Losses, Charge-offs	(13)		(13)	(324)
Allowance for Loan Losses, Recoveries	210		210	98
Allowance for Loan Losses, Ending Allowance	406	370	406	370
Originated [Member] | Home Equity Lines Of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	74	70	76	73
Allowance for Loan Losses, Provision (credit)	35	3	33
Allowance for Loan Losses, Charge-offs	(60)		(60)
Allowance for Loan Losses, Recoveries	19		19
Allowance for Loan Losses, Ending Allowance	68	73	68	73
Originated [Member] | Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	133	113	144	313
Allowance for Loan Losses, Provision (credit)	(4)	61	(15)	259
Allowance for Loan Losses, Charge-offs	(10)	(19)	(10)	(417)
Allowance for Loan Losses, Recoveries		4		4
Allowance for Loan Losses, Ending Allowance	119	159	119	159
Acquired [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	65		26
Allowance for Loan Losses, Provision (credit)			39	38
Allowance for Loan Losses, Charge-offs				(38)
Allowance for Loan Losses, Ending Allowance	$ 65		$ 65
Acquired [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Provision (credit)		3		2
Allowance for Loan Losses, Charge-offs		$ (3)		(2)
Acquired [Member] | Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Provision (credit)				3
Allowance for Loan Losses, Charge-offs				$ (3)

Loans Receivable - Summary of B

Loans Receivable - Summary of Balance in Allowance for Loan Losses and Recorded investment in Loans by Portfolio Segment, and Based on Impairment Method (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	$ 12,317		$ 17,322
Loans, Collectively Evaluated for Impairment	874,131		792,935
Total	889,415		813,624
Allowance for Loan Losses, Individually Evaluated for Impairment	417		1,142
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,142		3,982
Allowance for Loan Losses, Total	4,624	$ 4,471	5,150	$ 4,830	$ 4,628	$ 4,042
Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	2,967		3,367
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	65		26
Originated And Acquired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Total	4,624		5,150
Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	2,879		4,471
Loans, Collectively Evaluated for Impairment	249,655		211,983
Total	253,847		217,778
Allowance for Loan Losses, Individually Evaluated for Impairment	127		131
Allowance for Loan Losses, Collectively Evaluated for Impairment	208		229
Residential [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	1,313		1,324
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	65		26
Residential [Member] | Originated And Acquired Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Total	400		386
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	2,440		2,411
Loans, Collectively Evaluated for Impairment	480,887		433,416
Total	484,810		437,651
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,817		2,589
Allowance for Loan Losses, Total	2,817		2,589
Commercial [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	1,483		1,824
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	0		0
Construction [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	2,260		3,661
Loans, Collectively Evaluated for Impairment	13,838		18,743
Total	16,098		22,404
Allowance for Loan Losses, Individually Evaluated for Impairment	276		997
Allowance for Loan Losses, Collectively Evaluated for Impairment	214		153
Allowance for Loan Losses, Total	490		1,150
Construction [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	0		0
Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	349		356
Loans, Collectively Evaluated for Impairment	35,548		32,941
Total	35,897		33,297
Allowance for Loan Losses, Individually Evaluated for Impairment	8		7
Allowance for Loan Losses, Collectively Evaluated for Impairment	316		433
Allowance for Loan Losses, Total	324		440
Commercial Loans [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	0		0
Other Loans Secured [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	3,973		5,813
Loans, Collectively Evaluated for Impairment	43,797		40,989
Total	47,770		46,802
Allowance for Loan Losses, Individually Evaluated for Impairment	1		2
Allowance for Loan Losses, Collectively Evaluated for Impairment	405		363
Allowance for Loan Losses, Total	406		365
Other Loans Secured [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	0		0
Home Equity Lines Of Credit [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	416		610
Loans, Collectively Evaluated for Impairment	37,633		41,140
Total	38,220		41,927
Allowance for Loan Losses, Individually Evaluated for Impairment	5		5
Allowance for Loan Losses, Collectively Evaluated for Impairment	63		71
Allowance for Loan Losses, Total	68		76
Home Equity Lines Of Credit [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	171		177
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	0		0
Consumer And Installment Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Collectively Evaluated for Impairment	12,773		13,723
Total	12,773		13,765
Allowance for Loan Losses, Collectively Evaluated for Impairment	119		144
Allowance for Loan Losses, Total	119		144
Consumer And Installment Loans [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality			42
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	$ 0		$ 0

Loans Receivable - Summary of39

Loans Receivable - Summary of Loans Individually Evaluated for Impairment (Excluding Loans Acquired with Deteriorated Credit Quality) by Class of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financing Receivable Impaired [Line Items]
Impaired loans, unpaid principal balance	$ 18,342	$ 22,440
Impaired loans, recorded investment	12,317	17,322
Allowance for loan losses	417	1,142
Residential [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	2,698	4,216
Impaired loans with no related allowance recorded, recorded investment	2,428	4,014
Impaired loans with a related allowance recorded, unpaid principal balance	390	395
Impaired loans with a related allowance recorded, recorded investment	451	457
Impaired loans, recorded investment	2,879	4,471
Allowance for loan losses	127	131
Commercial [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	2,946	2,935
Impaired loans with no related allowance recorded, recorded investment	2,440	2,411
Impaired loans, recorded investment	2,440	2,411
Construction [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance		404
Impaired loans with no related allowance recorded, recorded investment		404
Impaired loans with a related allowance recorded, unpaid principal balance	3,257	3,257
Impaired loans with a related allowance recorded, recorded investment	2,260	3,257
Impaired loans, recorded investment	2,260	3,661
Allowance for loan losses	276	997
Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance		276
Impaired loans with no related allowance recorded, recorded investment		277
Impaired loans with a related allowance recorded, unpaid principal balance	349	79
Impaired loans with a related allowance recorded, recorded investment	349	79
Impaired loans, recorded investment	349	356
Allowance for loan losses	8	7
Other Loans Secured [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	7,163	9,157
Impaired loans with no related allowance recorded, recorded investment	2,916	4,702
Impaired loans with a related allowance recorded, unpaid principal balance	1,057	1,111
Impaired loans with a related allowance recorded, recorded investment	1,057	1,111
Impaired loans, recorded investment	3,973	5,813
Allowance for loan losses	1	2
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	471	599
Impaired loans with no related allowance recorded, recorded investment	405	599
Impaired loans with a related allowance recorded, unpaid principal balance	11	11
Impaired loans with a related allowance recorded, recorded investment	11	11
Impaired loans, recorded investment	416	610
Allowance for loan losses	$ 5	$ 5

Loans Receivable - Average Reco

Loans Receivable - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment, by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable Impaired [Line Items]
Impaired loans average recorded investment	$ 12,835	$ 15,872	$ 14,943	$ 15,655
Impaired loans interest income recognized	136	104	591	396
Residential [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	2,776	3,048	3,360	3,078
Impaired loans with no related allowance recorded, interest income recognized	13		179
Impaired loans with a related allowance recorded, average recorded investment	452	517	454	513
Impaired loans with a related allowance recorded, interest income recognized	4	4	11	14
Commercial [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	2,440	2,287	2,447	2,303
Impaired loans with no related allowance recorded, interest income recognized	37	32	91	95
Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment		89		91
Impaired loans with no related allowance recorded, interest income recognized		1		3
Impaired loans with a related allowance recorded, average recorded investment	350		353
Impaired loans with a related allowance recorded, interest income recognized	1		5
Other Loans Secured [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	3,027	4,804	3,704	4,846
Impaired loans with no related allowance recorded, interest income recognized	68	53	228	172
Impaired loans with a related allowance recorded, average recorded investment	1,067	1,129	1,086	1,141
Impaired loans with a related allowance recorded, interest income recognized	13	14	40	43
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	452	599	549	599
Impaired loans with no related allowance recorded, interest income recognized			20	(2)
Impaired loans with a related allowance recorded, average recorded investment	11	11	11	11
Construction [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment			121
Impaired loans with no related allowance recorded, interest income recognized			17
Impaired loans with a related allowance recorded, average recorded investment	$ 2,260	$ 3,388	$ 2,858	3,073
Impaired loans with a related allowance recorded, interest income recognized				$ 71

Loans Receivable - Nonaccrual L

Loans Receivable - Nonaccrual Loans and in Loans Past Due over 90 Days Still on Accrual Status by Class of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 7,444	$ 12,072
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,129	2,581
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	262
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,260	3,661
Originated [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	275
Originated [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,307	2,959
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	100	302
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,299	1,776
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	508	497
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 304	$ 296

Loans Receivable - Aging of Rec

Loans Receivable - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 8,344	$ 10,371
Current	881,071	803,253
Total	889,415	813,624
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,031	331
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		937
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,313	9,103
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	253,847	217,778
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	484,810	437,651
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	16,098	22,404
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	35,897	33,297
Other Loans Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	47,770	46,802
Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	38,220	41,927
Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	12,773	13,765
Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,908	6,849
Current	744,638	651,286
Total	749,546	658,135
Originated [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	775	94
Originated [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		474
Originated [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,133	6,281
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	736	2,342
Current	195,610	153,390
Total	196,346	155,732
Originated [Member] | Residential [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		94
Originated [Member] | Residential [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		275
Originated [Member] | Residential [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	736	1,973
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,037
Current	407,747	355,247
Total	408,784	355,247
Originated [Member] | Commercial [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	775
Originated [Member] | Commercial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	262
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,260	3,661
Current	13,838	18,743
Total	16,098	22,404
Originated [Member] | Construction [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,260	3,661
Originated [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	275
Current	35,033	31,613
Total	35,308	31,613
Originated [Member] | Commercial Loans [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	275
Originated [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	500	544
Current	47,140	43,612
Total	47,640	44,156
Originated [Member] | Other Loans Secured [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	500	544
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	100	302
Current	32,646	35,246
Total	32,746	35,548
Originated [Member] | Home Equity Lines Of Credit [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		199
Originated [Member] | Home Equity Lines Of Credit [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	100	103
Originated [Member] | Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,624	13,435
Total	12,624	13,435
Acquired [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,436	3,522
Current	136,433	151,967
Total	139,869	155,489
Acquired [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	256	237
Acquired [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		463
Acquired [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,180	2,822
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,030	2,172
Current	55,471	59,874
Total	57,501	62,046
Acquired [Member] | Residential [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	233	237
Acquired [Member] | Residential [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		463
Acquired [Member] | Residential [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,797	1,472
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,087	1,054
Current	74,939	81,350
Total	76,026	82,404
Acquired [Member] | Commercial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,087	1,054
Acquired [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	589	1,684
Total	589	1,684
Acquired [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	130	2,646
Total	130	2,646
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	319	296
Current	5,155	6,083
Total	5,474	6,379
Acquired [Member] | Home Equity Lines Of Credit [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	23
Acquired [Member] | Home Equity Lines Of Credit [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	296	296
Acquired [Member] | Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	149	330
Total	$ 149	$ 330

Loans Receivable - Summary of R

Loans Receivable - Summary of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 889,415	$ 813,624
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	867,464	788,286
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,387	192
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	19,564	25,146
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	253,847	217,778
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	484,810	437,651
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,098	22,404
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,897	33,297
Other Loans Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	47,770	46,802
Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	38,220	41,927
Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,773	13,765
Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	749,546	658,135
Originated [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	734,604	638,973
Originated [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	650	192
Originated [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,292	18,970
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	196,346	155,732
Originated [Member] | Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	194,594	153,165
Originated [Member] | Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	548
Originated [Member] | Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,204	2,567
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	408,784	355,247
Originated [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	405,696	352,203
Originated [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		134
Originated [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,088	2,910
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,098	22,404
Originated [Member] | Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,838	18,743
Originated [Member] | Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,260	3,661
Originated [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,308	31,613
Originated [Member] | Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,647	28,944
Originated [Member] | Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,661	2,669
Originated [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	47,640	44,156
Originated [Member] | Other Loans Secured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	42,606	37,267
Originated [Member] | Other Loans Secured [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,034	6,889
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,746	35,548
Originated [Member] | Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,599	35,246
Originated [Member] | Home Equity Lines Of Credit [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	102	58
Originated [Member] | Home Equity Lines Of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	45	244
Originated [Member] | Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,624	13,435
Originated [Member] | Consumer And Installment Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,624	13,405
Originated [Member] | Consumer And Installment Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans		30
Acquired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	139,869	155,489
Acquired [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	132,860	149,313
Acquired [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,737
Acquired [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,272	6,176
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,501	62,046
Acquired [Member] | Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	54,367	58,665
Acquired [Member] | Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	253
Acquired [Member] | Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,881	3,381
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	76,026	82,404
Acquired [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	72,565	80,082
Acquired [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,470
Acquired [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,991	2,322
Acquired [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	589	1,684
Acquired [Member] | Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	589	1,684
Acquired [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	130	2,646
Acquired [Member] | Other Loans Secured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	116	2,646
Acquired [Member] | Other Loans Secured [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,474	6,379
Acquired [Member] | Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,074	5,906
Acquired [Member] | Home Equity Lines Of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	400	473
Acquired [Member] | Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	149	330
Acquired [Member] | Consumer And Installment Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 149	$ 330

Loans Receivable - Schedule of

Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 886,718	$ 809,648
Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	2,902	3,341
Acquired with Deteriorated Credit Quality [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,248	1,298
Acquired with Deteriorated Credit Quality [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,483	1,824
Acquired with Deteriorated Credit Quality [Member] | Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 171	177
Acquired with Deteriorated Credit Quality [Member] | Consumer And Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans		$ 42

Loans Receivable - Schedule o45

Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans, allowance	$ 65	$ 26

Loans Receivable - Summary of46

Loans Receivable - Summary of Accretable Yield, or Income Expected to be Collected for Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract]
Beginning balance	$ 238	$ 486	$ 403	$ 578
Accretion income	(7)	(47)	(59)	(139)
Disposals			(113)
Ending balance	$ 231	$ 439	$ 231	$ 439

Other Comprehensive Income (L47

Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018		Mar. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 279,846		$ 109,949
Total other comprehensive (loss) income	$ (406)	$ 2,622	(861)		2,302
Ending Balance	284,660	117,270	284,660		117,270
Net Unrealized Gain (Loss) on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(669)	(209)	37		523
Other comprehensive (loss) income before reclassifications	(705)	319	(1,635)		(790)
Amounts reclassified from accumulated other comprehensive income			(139)
Tax effect	149	(109)	512		268
Total other comprehensive (loss) income	(556)	210	(1,262)		(522)
Reclassification of certain tax effects on other comprehensive income	(132)		(132)
Ending Balance	(1,357)	1	(1,357)		1
Unrealized Losses on Retirement Plans [Member] | Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,763)	(7,302)	(5,002)		(7,683)
Other comprehensive (loss) income before reclassifications		4,357			4,357
Amounts reclassified from accumulated other comprehensive income	182	(727)	544		(149)
Tax effect	(39)	(1,233)	(162)		(1,430)
Total other comprehensive (loss) income	143	2,397	382		2,778
Reclassification of certain tax effects on other comprehensive income	(938)		(938)
Ending Balance	(5,558)	(4,905)	(5,558)		(4,905)
Unrealized Losses on Retirement Plans [Member] | SERP Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(238)	(779)	(250)		(810)
Amounts reclassified from accumulated other comprehensive income	10	24	26		70
Tax effect	(3)	(9)	(7)		(24)
Total other comprehensive (loss) income	7	15	19		46
Reclassification of certain tax effects on other comprehensive income	(47)		(47)
Ending Balance	(278)	(764)	(278)		(764)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(5,670)	(8,290)	(5,215)		(7,970)
Other comprehensive (loss) income before reclassifications	(705)	4,676	(1,635)		3,567
Amounts reclassified from accumulated other comprehensive income	192	(703)	431		(79)
Tax effect	107	(1,351)	343		(1,186)
Total other comprehensive (loss) income	(406)	2,622	(861)		2,302
Reclassification of certain tax effects on other comprehensive income	(1,117)		(1,117)	[1]
Ending Balance	$ (7,193)	$ (5,668)	$ (7,193)		$ (5,668)
[1]	The adoption of ASU 2018-02 requires the reclassification from accumulated other comprehensive income to retained earnings of certain stranded income tax effects in accumulated other comprehensive income resulting from the Tax Cuts and Jobs Act of 2017. Refer to Footnote 2 - Recent Accounting Pronouncements for additional information

Other Comprehensive Income (L48

Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)	Dec. 22, 2017	Dec. 21, 2017	Mar. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Corporate income tax rate	21.00%	34.00%	21.00%	34.00%

Post-Retirement Benefits - Addi

Post-Retirement Benefits - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Effective date of freezing and termination of the defined benefit pension plan			May 1, 2017
Defined benefit plan, contributions by employer	$ 0		$ 0
ESOP shares	1,453,209		1,453,209			1,453,209
Stock price	$ 10		$ 10
ESOP payable term			15 years
ESOP prime rate percentage			4.50%
ESOP borrowing	$ 13,600,000		$ 13,600,000
Number of shares committed to be released per year through 2032	96,881		96,881
Fair value of unallocated shares held by ESOP	$ 28,000,000		$ 28,000,000
ESOP Compensation	$ 478,000	$ 0	$ 1,757,000	$ 0
Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, contributions by employer					$ 0

Post-Retirement Benefits - Sche

Post-Retirement Benefits - Schedule of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Employee Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 150		$ 519
Interest cost	$ 242	250	$ 726	757
Expected return on plan assets	(505)	(462)	(1,511)	(1,424)
Amortization of prior net loss		300		1,021
Amortization of prior service cost	182	(48)	544	(192)
Gain on curtailment		(919)		(919)
Net periodic (benefit) cost	(81)	(729)	(241)	(238)
Supplemental Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	149	100	369	261
Interest cost	26	32	76	91
Amortization of prior net loss		23		70
Amortization of prior service cost	10		26
Net periodic (benefit) cost	$ 185	$ 155	$ 471	$ 422

Post-Retirement Benefits - Shar

Post-Retirement Benefits - Shares Held by ESOP (Detail) - shares	Mar. 31, 2018	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Allocated	96,881
Committed to be allocated	23,888	26,975
Unallocated	1,332,440	1,426,234
Total shares	1,453,209	1,453,209

Fair Value of Financial Instr52

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value transfers between levels	$ 0		$ 0
Carrying amount of loans	886,718,000		886,718,000			$ 809,648,000
Remaining valuation allowance	4,624,000	$ 4,830,000	4,624,000	$ 4,830,000	$ 4,471,000	5,150,000	$ 4,628,000	$ 4,042,000
Net charge-offs	130,000	37,000	1,144,000	799,000
Provision for loan losses	54,000	$ 235,000	389,000	823,000
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of loans	3,400,000		3,400,000			6,300,000
Remaining valuation allowance	$ 278,000		278,000			$ 1,100,000
Net charge-offs			1,100,000	38,000
Provision for loan losses			$ 201,000	$ 824,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates			10.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates			20.00%

Fair Value of Financial Instr53

Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Measured on a Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 107,321	$ 111,889
Measured on a Recurring Basis [Member] | U.S. Government and Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	61,566	63,445
Measured on a Recurring Basis [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	8,263	8,482
Measured on a Recurring Basis [Member] | Mortgage-backed Securities - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	37,460	39,930
Measured on a Recurring Basis [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	32	32
Measured on a Recurring Basis [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	107,321	111,889
Measured on a Recurring Basis [Member] | Level 2 [Member] | U.S. Government and Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	61,566	63,445
Measured on a Recurring Basis [Member] | Level 2 [Member] | Corporate and Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	8,263	8,482
Measured on a Recurring Basis [Member] | Level 2 [Member] | Mortgage-backed Securities - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	37,460	39,930
Measured on a Recurring Basis [Member] | Level 2 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	32	32
Measured on a Non-Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	3,319	6,049
Measured on a Non-Recurring Basis [Member] | Impaired Loans [Member] | Residential Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	399	1,126
Measured on a Non-Recurring Basis [Member] | Impaired Loans [Member] | Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,984	2,260
Measured on a Non-Recurring Basis [Member] | Impaired Loans [Member] | Commercial Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	286	72
Measured on a Non-Recurring Basis [Member] | Impaired Loans [Member] | Other Loans Secured [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	500	1,609
Measured on a Non-Recurring Basis [Member] | Impaired Loans [Member] | Home Equity Lines Of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	6	5
Measured on a Non-Recurring Basis [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	144	977
Measured on a Non-Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	3,319	6,049
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Impaired Loans [Member] | Residential Mortgages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	399	1,126
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Impaired Loans [Member] | Construction [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,984	2,260
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Impaired Loans [Member] | Commercial Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	286	72
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Impaired Loans [Member] | Other Loans Secured [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	500	1,609
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Impaired Loans [Member] | Home Equity Lines Of Credit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	6	5
Measured on a Non-Recurring Basis [Member] | Level 3 [Member] | Foreclosed Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 144	$ 977

Fair Value of Financial Instr54

Fair Value of Financial Instruments - Summary of Quantitative Information about Level 3 Fair Value Measurements for Selected Financial Instruments Measured at Fair Value on Non-recurring Basis (Detail) - Measured on a Non-Recurring Basis [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 3,319	$ 6,049
Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	3,319	$ 6,049
Valuation Technique(s)		Sales comparison
Unobservable Input(s)		Adjustments for differences in sales comparables
Range or Rate Used		0.00%
Level 3 [Member] | Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used		5.40%
Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used		6.30%
Impaired Loans [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Valuation Technique(s)		Discounted cash flow
Unobservable Input(s)		Discount rate
Impaired Loans [Member] | Residential [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	399	$ 1,126
Impaired Loans [Member] | Residential [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 399	$ 1,126
Valuation Technique(s)	Sales comparison	Sales comparison
Unobservable Input(s)	Adjustments for differences in sales comparables	Adjustments for differences in sales comparables
Impaired Loans [Member] | Residential [Member] | Level 3 [Member] | Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	(3.30%)	(5.10%)
Impaired Loans [Member] | Residential [Member] | Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	21.10%	7.80%
Impaired Loans [Member] | Construction [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 1,984	$ 2,260
Impaired Loans [Member] | Construction [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 1,984	$ 2,260
Valuation Technique(s)	Sales contract	Cost approach
Unobservable Input(s)	Discount to sales contract	Discount for distressed property
Range or Rate Used	10.00%	50.00%
Impaired Loans [Member] | Commercial Loans [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 286	$ 72
Impaired Loans [Member] | Commercial Loans [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 286	$ 72
Valuation Technique(s)	Discounted cash flow	Discounted cash flow
Unobservable Input(s)	Discount rate	Adjustments for differences in sales comparables
Range or Rate Used	5.30%
Impaired Loans [Member] | Commercial Loans [Member] | Level 3 [Member] | Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used		7.00%
Impaired Loans [Member] | Commercial Loans [Member] | Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used		7.50%
Impaired Loans [Member] | Other Loans Secured [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 500	$ 1,609
Impaired Loans [Member] | Other Loans Secured [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 500	$ 1,609
Valuation Technique(s)	Sales contract	Discounted cash flow
Unobservable Input(s)	Discount to sales contract	Discount rate
Range or Rate Used	10.00%	6.00%
Impaired Loans [Member] | Home Equity Lines Of Credit [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 6	$ 5
Impaired Loans [Member] | Home Equity Lines Of Credit [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 6	$ 5
Valuation Technique(s)	Sales comparison	Discounted cash flow
Unobservable Input(s)	Adjustments for differences in sales comparables	Discount rate
Range or Rate Used		6.30%
Impaired Loans [Member] | Home Equity Lines Of Credit [Member] | Level 3 [Member] | Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	4.20%
Impaired Loans [Member] | Home Equity Lines Of Credit [Member] | Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	21.10%
Foreclosed Real Estate [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 144	$ 977
Foreclosed Real Estate [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 144	$ 977
Valuation Technique(s)	Sales comparison	Sales comparison
Unobservable Input(s)	Adjustments for differences in sales comparables	Adjustments for differences in sales comparables
Foreclosed Real Estate [Member] | Level 3 [Member] | Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	(40.00%)	(23.40%)
Foreclosed Real Estate [Member] | Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used	8.80%	7.20%

Fair Value of Financial Instr55

Fair Value of Financial Instruments - Summary of Carrying Amounts and Estimated Fair Values of Bank's Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Financial assets:
Investment securities held to maturity	$ 357,761	$ 383,588
Investment securities available for sale	107,321	111,889
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	36,505	60,486
Investment securities held to maturity	366,362	383,551
Investment securities available for sale	107,321	111,889
Loans receivable, net	886,718	809,648
Accrued interest receivable	4,458	3,693
Federal Home Loan Bank stock	4,112	3,132
Financial liabilities:
Mortgage escrow funds	7,596	8,084
FHLB advances	68,872	42,598
Carrying Amount [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	765,560	793,681
Carrying Amount [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	322,425	294,780
Total [Member]
Financial assets:
Cash and cash equivalents	36,505	60,486
Investment securities held to maturity	357,761	383,588
Investment securities available for sale	107,321	111,889
Loans receivable, net	873,570	817,814
Accrued interest receivable	4,458	3,693
Financial liabilities:
Mortgage escrow funds	7,596	8,084
FHLB advances	68,681	45,504
Total [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	765,560	793,681
Total [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	324,732	297,508
Level 1 [Member]
Financial assets:
Cash and cash equivalents	36,505	60,486
Financial liabilities:
Mortgage escrow funds	7,596	8,084
Level 1 [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	765,560	793,681
Level 2 [Member]
Financial assets:
Investment securities held to maturity	357,648	383,318
Investment securities available for sale	107,321	111,889
Accrued interest receivable	1,580	1,243
Financial liabilities:
FHLB advances	68,681	45,504
Level 2 [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	324,732	297,508
Level 3 [Member]
Financial assets:
Investment securities held to maturity	113	270
Loans receivable, net	873,570	817,814
Accrued interest receivable	$ 2,878	$ 2,450

Regulatory Capital - Summary of

Regulatory Capital - Summary of Company's and Bank's Actual Capital Amounts and Ratios Compared to Required Ratios for Minimum Capital Adequacy and for Classification as Well Capitalized (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Leverage (Tier 1), Bank Actual Amount	$ 285,305	$ 278,528
Common Tier 1, Bank Actual Amount	285,305	278,528
Tier 1, Bank Actual Amount	285,305	278,528
Total, Bank Actual Amount	$ 289,929	$ 283,678
Leverage (Tier 1), Bank Actual Ratio	20.20%	20.00%
Common Tier 1, Bank Actual Ratio	30.50%	31.60%
Tier 1, Bank Actual Ratio	30.50%	31.60%
Total, Bank Actual Ratio	31.00%	32.20%
Leverage (Tier 1), For Capital Adequacy Purposes Amount	$ 56,612	$ 55,839
Common Tier 1, For Capital Adequacy Purposes Amount	42,056	39,631
Tier 1, For Capital Adequacy Purposes Amount	56,075	52,841
Total, For Capital Adequacy Purposes Amount	$ 74,766	$ 70,455
Leverage (Tier 1), For Capital Adequacy Purposes Ratio	4.00%	4.00%
Common Tier 1, For Capital Adequacy Purposes Ratio	4.50%	4.50%
Tier 1, For Capital Adequacy Purposes Ratio	6.00%	6.00%
Total, For Captial Adequacy Purposes Ratio	8.00%	8.00%
PCSB Commercial Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Leverage (Tier 1), Bank Actual Amount	$ 202,158	$ 190,990
Common Tier 1, Bank Actual Amount	202,158	190,990
Tier 1, Bank Actual Amount	202,158	190,990
Total, Bank Actual Amount	$ 197,534	$ 196,140
Leverage (Tier 1), Bank Actual Ratio	14.00%	13.70%
Common Tier 1, Bank Actual Ratio	21.20%	21.70%
Tier 1, Bank Actual Ratio	21.20%	21.70%
Total, Bank Actual Ratio	21.70%	22.30%
Leverage (Tier 1), For Capital Adequacy Purposes Amount	$ 56,557	$ 55,949
Common Tier 1, For Capital Adequacy Purposes Amount	42,015	39,631
Tier 1, For Capital Adequacy Purposes Amount	56,020	52,841
Total, For Capital Adequacy Purposes Amount	$ 74,693	$ 70,455
Leverage (Tier 1), For Capital Adequacy Purposes Ratio	4.00%	4.00%
Common Tier 1, For Capital Adequacy Purposes Ratio	4.50%	4.50%
Tier 1, For Capital Adequacy Purposes Ratio	6.00%	6.00%
Total, For Captial Adequacy Purposes Ratio	8.00%	8.00%
Leverage (Tier 1), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 70,696	$ 69,936
Common Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	60,688	57,245
Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	74,693	70,455
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 93,366	$ 88,069
Leverage (Tier 1), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%
Common Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%

Regulatory Capital - Additional

Regulatory Capital - Additional Information (Detail)	9 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer, phase period	4 years
Capital conservation buffer percentage at beginning period	1.875%	1.25%
Minimum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer percentage required under regulatory	2.50%

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	9 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	Apr. 19, 2017	Mar. 31, 2017
Earnings Per Share [Abstract]
Number of dilutive potential common stock equivalents	0
Common Stock, shares outstanding	18,165,110	18,165,110	0	0

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net Income	$ 2,177	$ 1,891	$ 3,935	$ 5,019
Average number of common shares outstanding	18,165,110		18,165,110
Less: Average unallocated ESOP shares	1,344,384		1,375,979
Average number of common shares outstanding used to calculate basic earnings per common share	16,820,726		16,789,131
Earnings per Common share:
Basic	$ 0.13		$ 0.23
Diluted	$ 0.13		$ 0.23

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 22, 2017	Dec. 21, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Corporate income tax rate	21.00%	34.00%	21.00%	34.00%
Re-measurement charge (benefit) through income tax expense			$ (182,000)		$ 1,600,000
Effective date for change in corporate income tax rate					Jan. 1, 2018