PCSB Financial (PCSB) 10-Q 9 Feb 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2017	Feb. 09, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
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	Dec. 31, 2017	Jun. 30, 2017
ASSETS
Cash and due from banks	$ 75,778	$ 59,115
Federal funds sold	1,328	1,371
Total cash and cash equivalents	77,106	60,486
Investment Securities:
Held to maturity investment securities, at amortized cost (fair value of $363,457 and $383,588, respectively)	367,646	383,551
Available for sale securities, at fair value	102,714	111,889
Total investment securities	470,360	495,440
Loans receivable, net of allowance for loan losses of $4,471 and $5,150, respectively	838,120	809,648
Accrued interest receivable	4,001	3,693
Federal Home Loan Bank stock	2,395	3,132
Premises and equipment, net	12,625	12,959
Deferred tax asset, net	2,832	4,770
Foreclosed real estate		977
Bank-owned life insurance	23,473	23,179
Goodwill	6,106	6,106
Other intangible assets	495	559
Other assets	5,755	5,509
Total assets	1,443,268	1,426,458
LIABILITIES AND SHAREHOLDERS' EQUITY
Interest bearing deposits	963,495	952,109
Non-interest bearing deposits	150,834	136,352
Total deposits	1,114,329	1,088,461
Mortgage escrow funds	8,229	8,084
Advances from Federal Home Loan Bank	30,720	42,598
Other liabilities	7,579	7,469
Total liabilities	1,160,857	1,146,612
Commitments and contingencies
Preferred stock ($0.01 par value, 10,000,000 shares authorized, no shares issued or outstanding as of December 31, 2017 and June 30, 2017)
Common stock ($0.01 par value, 200,000,000 shares authorized, 18,165,110 shares issued and outstanding as of December 31, 2017 and June 30, 2017)	182	182
Additional paid in capital	178,556	177,993
Retained earnings	122,906	121,148
Unallocated common stock of Employee Stock Ownership Plan ("ESOP")	(13,563)	(14,262)
Accumulated other comprehensive loss, net of income taxes	(5,670)	(5,215)
Total shareholders' equity	282,411	279,846
Total liabilities and shareholders' equity	$ 1,443,268	$ 1,426,458

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Held to maturity investment securities, fair value	$ 363,457	$ 383,588
Allowance for loan losses	$ 4,471	$ 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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income
Loans receivable	$ 9,171,000	$ 8,238,000	$ 17,989,000	$ 16,763,000
Investment securities	2,269,000	1,530,000	4,514,000	3,010,000
Federal funds and other	217,000	82,000	451,000	186,000
Total interest and dividend income	11,657,000	9,850,000	22,954,000	19,959,000
Interest expense
Deposits	1,307,000	1,292,000	2,574,000	2,576,000
FHLB advances	164,000	31,000	318,000	81,000
Total interest expense	1,471,000	1,323,000	2,892,000	2,657,000
Net interest income	10,186,000	8,527,000	20,062,000	17,302,000
Provision for loan losses	200,000	562,000	335,000	588,000
Net interest income after provision for loan losses	9,986,000	7,965,000	19,727,000	16,714,000
Noninterest income
Fees and service charges	293,000	360,000	569,000	602,000
Gain on sale of securities, net			173,000	0
Bank-owned life insurance	145,000	160,000	294,000	328,000
Settlement on acquired loan		1,615,000		1,615,000
Other	254,000	124,000	370,000	266,000
Total noninterest income	692,000	2,259,000	1,406,000	2,811,000
Noninterest expense
Salaries and employee benefits	4,823,000	4,444,000	9,636,000	8,694,000
Occupancy and equipment	1,296,000	1,844,000	2,578,000	3,135,000
Professional fees	379,000	276,000	792,000	585,000
Advertising	179,000	90,000	344,000	229,000
Postage, printing, stationary and supplies	142,000	131,000	274,000	264,000
FDIC assessment	64,000	106,000	142,000	321,000
Amortization of intangible assets	33,000	37,000	65,000	73,000
Other operating expenses	1,209,000	866,000	2,188,000	1,691,000
Total noninterest expense	8,125,000	7,794,000	16,019,000	14,992,000
Net income before income tax expense	2,553,000	2,430,000	5,114,000	4,533,000
Income tax expense	2,551,000	758,000	3,356,000	1,405,000
Net income	$ 2,000	$ 1,672,000	$ 1,758,000	$ 3,128,000
Earnings per common share:
Basic	$ 0		$ 0.10
Diluted	$ 0		$ 0.10
Weighted average common shares outstanding - basic and diluted	16,791,305		16,773,883

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Net Income	$ 2	$ 1,672	$ 1,758	$ 3,128
Unrealized gains (losses) on available for sale securities:
Net change in unrealized gains/losses before reclassification adjustment	(717)	(1,262)	(930)	(1,109)
Reclassification adjustment for gains realized in net income			(139)
Net change in unrealized gains/losses	(717)	(1,262)	(1,069)	(1,109)
Tax effect	243	429	363	377
Net of tax	(474)	(833)	(706)	(732)
Defined benefit pension plan and supplemental retirement plans:
Total other comprehensive (loss)	(348)	(421)	(455)	(320)
Comprehensive (loss) income	(346)	1,251	1,303	2,808
Pension Benefits [Member]
Defined benefit pension plan and supplemental retirement plans:
Reclassification adjustment for amortization of prior service cost and net gain included in net periodic pension cost	181	577	362	577
Tax effect	(61)	(196)	(123)	(196)
Net of tax	120	381	239	381
SERP Benefits [Member]
Defined benefit pension plan and supplemental retirement plans:
Reclassification adjustment for amortization of prior service cost and net gain included in net periodic pension cost	8	47	16	47
Tax effect	(2)	(16)	(4)	(16)
Net of tax	$ 6	$ 31	$ 12	$ 31

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		3,128			3,128
Other comprehensive loss		(320)					(320)
Ending Balance at Dec. 31, 2016		112,757			121,047		(8,290)
Beginning Balance at Sep. 30, 2016							(7,869)
Net Income		1,672
Other comprehensive loss		(421)					(421)
Ending Balance at Dec. 31, 2016		112,757			121,047		(8,290)
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		1,758			1,758
Other comprehensive loss		(455)					(455)
Issuance of common stock	[1]	(17)		(17)
ESOP shares committed to be released (69,906 shares)		1,279		580		699
Ending Balance at Dec. 31, 2017		282,411	$ 182	178,556	122,906	(13,563)	(5,670)
Ending Balance (in shares) at Dec. 31, 2017			18,165,110
Beginning Balance at Sep. 30, 2017							(5,322)
Net Income		2
Other comprehensive loss		(348)					(348)
Ending Balance at Dec. 31, 2017		$ 282,411	$ 182	$ 178,556	$ 122,906	$ (13,563)	$ (5,670)
Ending Balance (in shares) at Dec. 31, 2017			18,165,110
[1]	Represents costs incurred in connection with the Company's initial public offering completed in the prior period.

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)	6 Months Ended
	Dec. 31, 2017shares
Statement Of Stockholders Equity [Abstract]
ESOP shares committed to be released (in shares)	69,906

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Net Income	$ 1,758,000	$ 3,128,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	335,000	588,000
Depreciation and amortization	760,000	705,000
Amortization of net premiums on securities and net deferred loan origination costs	941,000	607,000
Net (increase) decrease in accrued interest receivable	(308,000)	65,000
Net loss (gain) on sale of foreclosed real estate	21,000	(30,000)
Net gains on sales of securities	(173,000)	0
ESOP Compensation	1,279,000	0
Earnings from cash surrender value of BOLI	(294,000)	(328,000)
Net accretion of purchase account adjustments	(361,000)	(438,000)
Other adjustments, principally net changes in other assets and liabilities	2,416,000	(3,106,000)
Net cash provided by operating activities	6,374,000	1,191,000
Purchases of investment securities:
Held to maturity	(27,463,000)	(52,229,000)
Available for sale	(15,651,000)	(9,073,000)
Sales of investment securities available for sale	6,100,000
Maturities and calls of investment securities:
Held to maturity	43,060,000	50,043,000
Available for sale	17,603,000	24,816,000
Principal repayments net of disbursement for loan originations	17,792,000	19,715,000
Purchase of loans	(46,657,000)	(6,041,000)
Net redemption of FHLB stock	737,000	723,000
Purchase of bank premises and equipment	(362,000)	(1,431,000)
Proceeds from sale of foreclosed real estate	956,000	254,000
Net cash (used in) provided by investing activities	(3,885,000)	26,777,000
FINANCING ACTIVITIES
Net increase (decrease) in deposits	25,881,000	(4,874,000)
Net decrease in short-term FHLB advances	(11,818,000)
Repayment of long-term FHLB advances	(60,000)	(16,059,000)
Net increase (decrease) in mortgage escrow funds	145,000	(286,000)
Issuance of common stock	(17,000)
Net cash provided by (used in) financing activities	14,131,000	(21,219,000)
Net increase in cash and cash equivalents	16,620,000	6,749,000
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	77,106,000	48,327,000
Cash paid for:
Interest	2,844,000	2,671,000
Income taxes	$ 2,010,000	134,000
Loans transferred to foreclosed real estate and other assets		$ 1,533,000

Basis of Presentation

Basis of Presentation	6 Months Ended
	Dec. 31, 2017
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	6 Months Ended
	Dec. 31, 2017
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.” The amendments in ASU 2014-09 provide a comprehensive framework for addressing revenue recognition issues that can be applied to all contracts with customers. The amendments in ASU 2014-09 also include improved disclosures to enable users of financial statements to better understand the nature, amount, timing and uncertainty of revenue that is recognized. For public entities, ASU 2014-09, as amended, is effective for interim and annual reporting periods beginning after December 15, 2017. 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. 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. 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 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. For public entities, the amendments in ASU 2016-01 are effective for interim and annual reporting periods beginning after December 15, 2017. 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 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. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. 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. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. 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. ASU 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2019. 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.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Dec. 31, 2017
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	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and June 30, 2017 were as follows: December 31, 2017 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 55,569 $ - $ (545 ) $ 55,024 Corporate and other debt securities 8,433 6 (77 ) 8,362 Mortgage-backed securities – residential 39,692 134 (530 ) 39,296 Equity securities 32 - - 32 Total available for sale $ 103,726 $ 140 $ (1,152 ) $ 102,714 Held to maturity: U.S. Government and agency obligations $ 136,060 $ - $ (1,377 ) $ 134,683 Corporate and other debt securities 4,000 - (129 ) 3,871 Mortgage-backed securities – residential 140,411 141 (1,771 ) 138,781 Mortgage-backed securities – collateralized mortgage obligations 55,829 4 (892 ) 54,941 Mortgage-backed securities – commercial 31,346 166 (331 ) 31,181 Total held to maturity $ 367,646 $ 311 $ (4,500 ) $ 363,457 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 six months ended December 31, 2017, 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 six months ended December 31, 2016. The following table presents the fair value and carrying amount of debt securities at December 31, 2017, 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) December 31, 2017: 1 year or less $ 37,492 $ 37,402 $ 11,018 $ 10,981 1 to 5 years 98,568 97,280 50,984 50,444 5 to 10 years - - 2,000 1,961 Mortgage-backed securities and other 231,586 228,775 39,692 39,296 Total $ 367,646 $ 363,457 $ 103,694 $ 102,682 Securities pledged had carrying amounts of $78.2 million and $95.5 million at December 31, 2017 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 December 31, 2017 and June 30, 2017 December 31, 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 $ 34,231 $ (267 ) $ 20,793 $ (278 ) $ 55,024 $ (545 ) Corporate and other debt securities 6,336 (77 ) - - 6,336 (77 ) Mortgage-backed securities – residential 20,847 (300 ) 10,604 (230 ) 31,451 (530 ) Total available for sale $ 61,414 $ (644 ) $ 31,397 $ (508 ) $ 92,811 $ (1,152 ) Held to maturity: U.S. Government and agency obligations $ 60,450 $ (587 ) $ 67,232 $ (790 ) $ 127,682 $ (1,377 ) Corporate and other debt securities 3,871 (129 ) - - 3,871 (129 ) Mortgage-backed securities – residential 95,903 (993 ) 27,052 (778 ) 122,955 (1,771 ) Mortgage-backed securities – collateralized mortgage obligations 41,965 (561 ) 11,973 (331 ) 53,938 (892 ) Mortgage-backed securities – commercial 11,089 (126 ) 8,887 (205 ) 19,976 (331 ) Total held to maturity $ 213,278 $ (2,396 ) $ 115,144 $ (2,104 ) $ 328,422 $ (4,500 ) 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 December 31, 2017, the Company’s security portfolio consisted of $470.4 million in securities, of which 227 securities with a fair value of $421.2 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 December 31, 2017 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 December 31, 2017 and June 30, 2017.

Loans Receivable

Loans Receivable	6 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans Receivable	Note 5. Loans Receivable Loans receivable are summarized as follows (in thousands): December 31, June 30, 2017 2017 Mortgage loans: Residential $ 213,716 $ 217,778 Commercial 481,169 437,651 Construction 16,379 22,404 Net deferred loan origination costs 210 397 Total mortgages 711,474 678,230 Commercial and consumer loans: Commercial loans 31,276 33,297 Other loans secured 46,056 46,802 Home equity lines of credit 40,158 41,927 Consumer and installment loans 12,860 13,765 Net deferred loan origination costs 767 777 Total commercial and consumer loans 131,117 136,568 Total loans receivable 842,591 814,798 Allowance for loan losses (4,471 ) (5,150 ) Loans receivable, net $ 838,120 $ 809,648 In 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. The following tables present the activity in the allowance for loan losses by portfolio segment for the three and six months ended December 31, 2017 and 2016 (in thousands): Three Months Ended December 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 407 $ (5 ) $ - $ - $ 402 Commercial 2,709 (23 ) - - 2,686 Construction 1,160 237 (997 ) - 400 Commercial loans 345 (23 ) - - 322 Other loans secured 404 (15 ) - - 389 Home equity lines of credit 77 (3 ) - - 74 Consumer and installment loans 140 (7 ) - - 133 Acquired: Residential 26 39 - - 65 Total $ 5,268 $ 200 $ (997 ) $ - $ 4,471 Three Months Ended December 31, 2016 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 238 $ - $ - $ - $ 238 Commercial 2,121 909 - 1 3,031 Construction 302 34 - - 336 Commercial loans 559 (458 ) - 400 501 Other loans secured 361 (22 ) - - 339 Home equity lines of credit 70 - - - 70 Consumer and installment loans 414 97 (398 ) - 113 Acquired: Commercial loans - 2 (2 ) - - Total $ 4,065 $ 562 $ (400 ) $ 401 $ 4,628 Six Months Ended December 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 360 $ 59 $ (17 ) $ - $ 402 Commercial 2,589 97 - - 2,686 Construction 1,150 247 (997 ) - 400 Commercial loans 440 (118 ) - - 322 Other loans secured 365 24 - - 389 Home equity lines of credit 76 (2 ) - - 74 Consumer and installment loans 144 (11 ) - - 133 Acquired: Residential 26 39 - - 65 Total $ 5,150 $ 335 $ (1,014 ) $ - $ 4,471 Six Months Ended December 31, 2016 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 237 $ (69 ) $ - $ 70 $ 238 Commercial 2,149 863 - 19 3,031 Construction 269 67 - - 336 Commercial loans 604 (676 ) - 573 501 Other loans secured 397 168 (324 ) 98 339 Home equity lines of credit 73 (3 ) - - 70 Consumer and installment loans 313 198 (398 ) - 113 Acquired: - Residential - 38 (38 ) - - Commercial loans - 2 (2 ) - - Total $ 4,042 $ 588 $ (762 ) $ 760 $ 4,628 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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 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 $ 3,499 $ 208,900 $ 1,317 $ 213,716 $ 190 $ 212 $ 65 $ 467 Commercial 2,438 477,238 1,493 481,169 - 2,686 - 2,686 Construction 2,260 14,119 - 16,379 276 124 - 400 Commercial loans 351 30,925 - 31,276 75 247 - 322 Other loans secured 4,165 41,891 - 46,056 2 387 - 389 Home equity lines of credit 480 39,505 173 40,158 5 69 - 74 Consumer and installment loans - 12,840 20 12,860 - 133 - 133 Total $ 13,193 $ 825,418 $ 3,003 $ 841,614 $ 548 $ 3,858 $ 65 $ 4,471 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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 2,940 $ 2,721 $ - Commercial 2,948 2,438 - Other loans secured 7,558 3,088 - Home equity lines of credit 473 469 - With a related allowance recorded: Residential 747 778 190 Construction 3,257 2,260 276 Commercial loans 351 351 75 Other loans secured 1,077 1,077 2 Home equity lines of credit 11 11 5 Total $ 19,362 $ 13,193 $ 548 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 six months ended December 31, 2017 and 2016 (in thousands): Three months ended Three months ended December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,027 $ 124 $ 3,725 $ 3 Commercial 2,454 27 2,303 31 Commercial loans - - 91 1 Other loans secured 3,488 77 5,489 66 Home equity lines of credit 571 20 551 - With a related allowance recorded: Residential 778 3 - - Commercial - - 3,132 25 Construction 3,008 - 131 - Commercial loans 352 - - - Other loans secured 1,087 13 - - Home equity lines of credit 11 - - - Total $ 14,776 $ 264 $ 15,422 $ 126 Six Months Ended Six Months Ended December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,431 $ 166 $ 3,753 $ 6 Commercial 2,447 54 2,311 63 Construction 173 17 - - Commercial loans - - 92 2 Other loans secured 4,002 160 5,513 134 Home equity lines of credit 593 20 551 (2 ) With a related allowance recorded: Residential 686 7 - - Commercial - - 3,141 52 Construction 3,115 - 131 - Commercial loans 353 4 - - Other loans secured 1,095 27 - - Home equity lines of credit 11 - - - Total $ 15,906 $ 455 $ 15,492 $ 255 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 December 31, 2017 and June 30, 2017 (in thousands): Loans Past Due Over 90 Days Nonaccrual and Still Accruing December 31, June 30, December 31, June 30, 2017 2017 2017 2017 Originated: Residential $ 1,772 $ 2,581 $ - $ - Commercial 258 - - - Construction 2,260 3,661 - - Commercial loans 275 - - - Other loans secured 1,368 2,959 - - Home equity lines of credit 100 302 - - Acquired: Residential 1,281 1,776 - - Commercial 508 497 - - Home equity lines of credit 369 296 - - Total $ 8,191 $ 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 December 31, 2017 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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 2017 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ - $ - $ 1,632 $ 1,632 $ 153,476 $ 155,108 Commercial - - 258 258 404,223 404,481 Construction - - 2,260 2,260 14,119 16,379 Commercial loans - - 275 275 30,412 30,687 Other loans secured - - 544 544 45,344 45,888 Home equity lines of credit - - 100 100 34,306 34,406 Consumer and installment loans 10 - - 10 12,661 12,671 Total originated 10 - 5,069 5,079 694,541 699,620 Acquired: Residential - - 1,778 1,778 56,830 58,608 Commercial - - 1,087 1,087 75,601 76,688 Commercial loans - - - - 589 589 Other loans secured - - - - 168 168 Home equity lines of credit 46 - 296 342 5,410 5,752 Consumer and installment loans - - - - 189 189 Total acquired 46 - 3,161 3,207 138,787 141,994 Total $ 56 $ - $ 8,230 $ 8,286 $ 833,328 $ 841,614 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 December 31, 2017 and June 30, 2017, the Company had 17 and 20 loans classified as troubled debt restructurings totaling $7.1 million and $9.9 million, respectively. The Company has allocated $211,000 and $145,000, respectively, of specific reserves to customers whose loan terms have been modified in troubled debt restructurings as of December 31, 2017 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 six months ended December 31, 2017 or 2016. The Company had two troubled debt restructurings with a total carrying amount of $1.1 million at December 31, 2017 for which there was a payment default in the six months ended December 31, 2017 that were modified in the twelve months prior to default, resulting in a $66,000 increase to the allowance for loan loss. One default, with a carrying amount of $0.8 million, has been cured as of December 31, 2017. There were no such defaults during the three months ended December 31, 2017 or the three or six months ended December 31, 2016. 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): December 31, 2017 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 152,995 $ 271 $ 1,842 $ - $ 155,108 Commercial 401,371 - 3,110 - 404,481 Construction 14,119 - 2,260 - 16,379 Commercial loans 28,024 - 2,663 - 30,687 Other loans secured 40,657 - 5,231 - 45,888 Home equity lines of credit 34,306 55 45 - 34,406 Consumer and installment loans 12,661 10 - - 12,671 Total originated 684,133 336 15,151 - 699,620 Acquired: Residential 57,864 109 635 - 58,608 Commercial 74,687 - 2,001 - 76,688 Commercial loans 589 - - - 589 Other loans secured 168 - - - 168 Home equity lines of credit 5,286 - 466 - 5,752 Consumer and installment loans 189 - - - 189 Total acquired 138,783 109 3,102 - 141,994 Total $ 822,916 $ 445 $ 18,253 $ - $ 841,614 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 December 31, 2017 and June 30, 2017 is as follows (in thousands): December 31, June 30, 2017 2017 Residential $ 1,252 $ 1,298 Commercial 1,493 1,824 Home equity lines of credit 173 177 Consumer and installment loans 20 42 Carrying amount, net of allowance of $65 and $26, respectively $ 2,938 $ 3,341 The allowance for loan loss on purchased credit impaired loans increased $39,000 during the three and six months ended December 31, 2017. Accretable yield, or income expected to be collected, for acquired loans is as follows (in thousands): Three Months Ended December 31, Six Months Ended December 31, 2017 2016 2017 2016 Beginning balance $ 375 $ 532 $ 403 $ 578 New loans acquired - - - - Accretion income (24 ) (46 ) (52 ) (92 ) Reclassification from non-accretable difference - - - - Disposals (113 ) - (113 ) - Ending balance $ 238 $ 486 $ 238 $ 486

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Dec. 31, 2017
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 October 1, 2017 $ (195 ) $ (4,883 ) $ (244 ) $ (5,322 ) Other comprehensive loss before reclassifications (717 ) - - (717 ) Amounts reclassified from accumulated other comprehensive income - 181 8 189 Tax effect 243 (61 ) (2 ) 180 Net other comprehensive (loss) income (474 ) 120 6 (348 ) Balance at December 31, 2017 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at October 1, 2016 $ 624 $ (7,683 ) $ (810 ) $ (7,869 ) Other comprehensive loss before reclassifications (1,262 ) - - (1,262 ) Amounts reclassified from accumulated other comprehensive income - 577 47 624 Tax effect 429 (196 ) (16 ) 217 Net other comprehensive (loss) income (833 ) 381 31 (421 ) Balance at December 31, 2016 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 ) 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 (930 ) - - (930 ) Amounts reclassified from accumulated other comprehensive (loss) income (139 ) 362 16 239 Tax effect 363 (123 ) (4 ) 236 Net other comprehensive (loss) income (706 ) 239 12 (455 ) Balance at December 31, 2017 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) 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 before reclassifications (1,109 ) - - (1,109 ) Amounts reclassified from accumulated other comprehensive income - 577 47 624 Tax effect 377 (196 ) (16 ) 165 Net other comprehensive (loss) income (732 ) 381 31 (320 ) Balance at December 31, 2016 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 )

Post-Retirement Benefits

Post-Retirement Benefits	6 Months Ended
	Dec. 31, 2017
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 six months ended December 31, 2017 and 2016 (in thousands): Three Months Ended Three Months Ended December 31, 2017 December 31, 2016 Defined Benefit Plan Supplemental Retirement Plans Defined Benefit Plan Supplemental Retirement Plans Service cost $ - $ 107 $ 184 $ 81 Interest cost 242 25 253 29 Expected return on plan assets (503 ) - (464 ) - Amortization of prior net loss - - 361 23 Amortization of prior service cost 181 8 (72 ) - Net periodic (benefit) cost $ (80 ) $ 140 $ 262 $ 133 Six Months Ended Six Months Ended December 31, 2017 December 31, 2016 Defined Benefit Plan Supplemental Retirement Plan Defined Benefit Plan Supplemental Retirement Plan Service cost $ - $ 220 $ 369 $ 161 Interest cost 484 50 507 58 Expected return on plan assets (1,006 ) - (962 ) - Amortization of prior net loss - - 721 47 Amortization of prior service cost 362 16 (144 ) - Net periodic cost $ (160 ) $ 66 $ 491 $ 266 The Company made no contributions to the defined benefit plan during the three and six months ended December 31, 2017 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 (4.00% at December 31, 2017). 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 December 31, 2017 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: December 31, 2017 June 30, 2017 Allocated 96,881 - Committed to be allocated - 26,975 Unallocated 1,356,328 1,426,234 Total shares 1,453,209 1,453,209 The fair value of unallocated shares was $25.8 million at December 31, 2017. Total compensation expense recognized in connection with the ESOP for the three and six

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017: Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 55,024 $ - $ 55,024 Corporate and other debt securities - 8,362 - 8,362 Mortgage-backed securities – residential - 39,296 - 39,296 Equity securities - 32 - 32 Total assets at fair value $ - $ 102,714 $ - $ 102,714 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 265 $ 265 Construction - - 1,984 1,984 Commercial loans - - 206 206 Other loans secured - - 500 500 Home equity lines of credit - - 72 72 Total assets at fair value $ - $ - $ 3,027 $ 3,027 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 six months ended December 31, 2017. Impaired loans in the table above had a carrying amount of $3.4 million, and a remaining valuation allowance of $405,000 at December 31, 2017, as compared to $6.3 million and $1.1 million, respectively, as of June 30, 2017. Impaired loans measured at fair value incurred $997,000 of net charge-offs and resulted in an additional provision for loan losses of $405,000 during the six months ended December 31, 2017. Impaired loans measured at fair value as of December 31, 2016 incurred $38,000 of net charge-offs and resulted in an additional provision for loan losses of $814,000 during the three months ended December 31, 2016. 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 December 31, 2017 and June 30, 2017 (dollars in thousands): Valuation Unobservable Range or Fair Value Technique(s) Input(s) Rate Used December 31, 2017: Impaired loans - residential mortgages $ 265 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% Impaired loans - construction 1,984 Sales contract n/a n/a Impaired loans - commercial loans 206 Discounted cash flow Discount rate 6.0% Impaired loans - other loans secured 500 Sales contract n/a n/a Impaired loans - home equity lines of credit 72 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% 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 December 31, 2017: Financial assets: Cash and cash equivalents $ 77,106 $ 77,106 $ - $ - $ 77,106 Investment securities held to maturity 367,646 - 363,253 204 363,457 Investment securities available for sale 102,714 - 102,714 - 102,714 Loans receivable, net 838,120 - - 834,729 834,729 Accrued interest receivable 4,001 - 1,291 2,710 4,001 Federal Home Loan Bank stock 2,395 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 802,782 802,782 - - 802,782 Time deposits 311,547 - 314,386 - 314,386 Mortgage escrow funds 8,229 8,229 - - 8,229 FHLB advances 30,720 - 30,633 - 30,633 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	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017 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 December 31, 2017: PCSB Bank Leverage (Tier 1) $ 195,169 13.8 % $ 56,400 4.0 % $ 70,500 5.0 % Risk-based: Common Tier 1 195,169 21.6 40,591 4.5 58,632 6.5 Tier 1 195,169 21.6 54,122 6.0 72,162 8.0 Total 199,640 22.1 72,162 8.0 90,203 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 282,716 19.9 % $ 56,713 4.0 % N/A N/A Risk-based: Common Tier 1 282,716 31.3 40,632 4.5 N/A N/A Tier 1 282,716 31.3 54,176 6.0 N/A N/A Total 287,187 31.8 72,234 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 December 31, 2017 and June 30, 2017, the Bank and Company met all capital adequacy requirements to which they were subject, including the capital conservation buffer of 1.250% as of both December 31, 2017 and June 30, 2017. 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	6 Months Ended
	Dec. 31, 2017
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 six months ended December 31, 2017. Earnings per share data is not applicable for the periods ended December 31, 2016 because the Company had not yet been formed and had no shares outstanding at a Company or Bank level. Three months ended December 31, 2017 Six months ended December 31, 2017 (amounts in thousands, except share and per share data) Net income applicable to common stock $ 2 $ 1,758 Average number of common shares outstanding 18,165,110 18,165,110 Less: Average unallocated ESOP shares 1,373,805 1,391,227 Average number of common shares outstanding used to calculate basic earnings per common share 16,791,305 16,773,883 Earnings per Common share: Basic $ 0.00 $ 0.10 Diluted $ 0.00 $ 0.10

Income Taxes

Income Taxes	6 Months Ended
	Dec. 31, 2017
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 through income tax expense of $1.8 million for the three and six months ended December 31, 2017. Although management does not expect the $1.8 million re-measurement charge to change materially, the charge is provisional as the Company continues to finalize its analysis of the Company’s deferred tax inventory, as well as other facts and circumstances that existed as of the law’s enactment date that is needed in order to complete the accounting requirements under ASC Topic 740 Income Taxes;

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Dec. 31, 2017
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)	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017 and June 30, 2017 were as follows: December 31, 2017 Amortized Gross Unrealized/Unrecognized Fair Cost Gains Losses Value (in thousands) Available for sale: U.S. Government and agency obligations $ 55,569 $ - $ (545 ) $ 55,024 Corporate and other debt securities 8,433 6 (77 ) 8,362 Mortgage-backed securities – residential 39,692 134 (530 ) 39,296 Equity securities 32 - - 32 Total available for sale $ 103,726 $ 140 $ (1,152 ) $ 102,714 Held to maturity: U.S. Government and agency obligations $ 136,060 $ - $ (1,377 ) $ 134,683 Corporate and other debt securities 4,000 - (129 ) 3,871 Mortgage-backed securities – residential 140,411 141 (1,771 ) 138,781 Mortgage-backed securities – collateralized mortgage obligations 55,829 4 (892 ) 54,941 Mortgage-backed securities – commercial 31,346 166 (331 ) 31,181 Total held to maturity $ 367,646 $ 311 $ (4,500 ) $ 363,457 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 December 31, 2017, 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) December 31, 2017: 1 year or less $ 37,492 $ 37,402 $ 11,018 $ 10,981 1 to 5 years 98,568 97,280 50,984 50,444 5 to 10 years - - 2,000 1,961 Mortgage-backed securities and other 231,586 228,775 39,692 39,296 Total $ 367,646 $ 363,457 $ 103,694 $ 102,682
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 December 31, 2017 and June 30, 2017 December 31, 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 $ 34,231 $ (267 ) $ 20,793 $ (278 ) $ 55,024 $ (545 ) Corporate and other debt securities 6,336 (77 ) - - 6,336 (77 ) Mortgage-backed securities – residential 20,847 (300 ) 10,604 (230 ) 31,451 (530 ) Total available for sale $ 61,414 $ (644 ) $ 31,397 $ (508 ) $ 92,811 $ (1,152 ) Held to maturity: U.S. Government and agency obligations $ 60,450 $ (587 ) $ 67,232 $ (790 ) $ 127,682 $ (1,377 ) Corporate and other debt securities 3,871 (129 ) - - 3,871 (129 ) Mortgage-backed securities – residential 95,903 (993 ) 27,052 (778 ) 122,955 (1,771 ) Mortgage-backed securities – collateralized mortgage obligations 41,965 (561 ) 11,973 (331 ) 53,938 (892 ) Mortgage-backed securities – commercial 11,089 (126 ) 8,887 (205 ) 19,976 (331 ) Total held to maturity $ 213,278 $ (2,396 ) $ 115,144 $ (2,104 ) $ 328,422 $ (4,500 ) 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)	6 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Summary of Loans Receivable	Loans receivable are summarized as follows (in thousands): December 31, June 30, 2017 2017 Mortgage loans: Residential $ 213,716 $ 217,778 Commercial 481,169 437,651 Construction 16,379 22,404 Net deferred loan origination costs 210 397 Total mortgages 711,474 678,230 Commercial and consumer loans: Commercial loans 31,276 33,297 Other loans secured 46,056 46,802 Home equity lines of credit 40,158 41,927 Consumer and installment loans 12,860 13,765 Net deferred loan origination costs 767 777 Total commercial and consumer loans 131,117 136,568 Total loans receivable 842,591 814,798 Allowance for loan losses (4,471 ) (5,150 ) Loans receivable, net $ 838,120 $ 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 six months ended December 31, 2017 and 2016 (in thousands): Three Months Ended December 31, 2017 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 407 $ (5 ) $ - $ - $ 402 Commercial 2,709 (23 ) - - 2,686 Construction 1,160 237 (997 ) - 400 Commercial loans 345 (23 ) - - 322 Other loans secured 404 (15 ) - - 389 Home equity lines of credit 77 (3 ) - - 74 Consumer and installment loans 140 (7 ) - - 133 Acquired: Residential 26 39 - - 65 Total $ 5,268 $ 200 $ (997 ) $ - $ 4,471 Three Months Ended December 31, 2016 Beginning Allowance Provision (credit) Charge-offs Recoveries Ending Allowance Originated: Residential $ 238 $ - $ - $ - $ 238 Commercial 2,121 909 - 1 3,031 Construction 302 34 - - 336 Commercial loans 559 (458 ) - 400 501 Other loans secured 361 (22 ) - - 339 Home equity lines of credit 70 - - - 70 Consumer and installment loans 414 97 (398 ) - 113 Acquired: Commercial loans - 2 (2 ) - - Total $ 4,065 $ 562 $ (400 ) $ 401 $ 4,628
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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 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 $ 3,499 $ 208,900 $ 1,317 $ 213,716 $ 190 $ 212 $ 65 $ 467 Commercial 2,438 477,238 1,493 481,169 - 2,686 - 2,686 Construction 2,260 14,119 - 16,379 276 124 - 400 Commercial loans 351 30,925 - 31,276 75 247 - 322 Other loans secured 4,165 41,891 - 46,056 2 387 - 389 Home equity lines of credit 480 39,505 173 40,158 5 69 - 74 Consumer and installment loans - 12,840 20 12,860 - 133 - 133 Total $ 13,193 $ 825,418 $ 3,003 $ 841,614 $ 548 $ 3,858 $ 65 $ 4,471 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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 2017 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses With no related allowance recorded: Residential $ 2,940 $ 2,721 $ - Commercial 2,948 2,438 - Other loans secured 7,558 3,088 - Home equity lines of credit 473 469 - With a related allowance recorded: Residential 747 778 190 Construction 3,257 2,260 276 Commercial loans 351 351 75 Other loans secured 1,077 1,077 2 Home equity lines of credit 11 11 5 Total $ 19,362 $ 13,193 $ 548 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 six months ended December 31, 2017 and 2016 (in thousands): Three months ended Three months ended December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,027 $ 124 $ 3,725 $ 3 Commercial 2,454 27 2,303 31 Commercial loans - - 91 1 Other loans secured 3,488 77 5,489 66 Home equity lines of credit 571 20 551 - With a related allowance recorded: Residential 778 3 - - Commercial - - 3,132 25 Construction 3,008 - 131 - Commercial loans 352 - - - Other loans secured 1,087 13 - - Home equity lines of credit 11 - - - Total $ 14,776 $ 264 $ 15,422 $ 126 Six Months Ended Six Months Ended December 31, 2017 December 31, 2016 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related allowance recorded: Residential $ 3,431 $ 166 $ 3,753 $ 6 Commercial 2,447 54 2,311 63 Construction 173 17 - - Commercial loans - - 92 2 Other loans secured 4,002 160 5,513 134 Home equity lines of credit 593 20 551 (2 ) With a related allowance recorded: Residential 686 7 - - Commercial - - 3,141 52 Construction 3,115 - 131 - Commercial loans 353 4 - - Other loans secured 1,095 27 - - Home equity lines of credit 11 - - - Total $ 15,906 $ 455 $ 15,492 $ 255
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 December 31, 2017 and June 30, 2017 (in thousands): Loans Past Due Over 90 Days Nonaccrual and Still Accruing December 31, June 30, December 31, June 30, 2017 2017 2017 2017 Originated: Residential $ 1,772 $ 2,581 $ - $ - Commercial 258 - - - Construction 2,260 3,661 - - Commercial loans 275 - - - Other loans secured 1,368 2,959 - - Home equity lines of credit 100 302 - - Acquired: Residential 1,281 1,776 - - Commercial 508 497 - - Home equity lines of credit 369 296 - - Total $ 8,191 $ 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 December 31, 2017 and June 30, 2017 (in thousands): December 31, 2017 30-59 60-89 90 Days or Days Past Days Past More Past Total Past Due Due Due Due Current Total Originated: Residential $ - $ - $ 1,632 $ 1,632 $ 153,476 $ 155,108 Commercial - - 258 258 404,223 404,481 Construction - - 2,260 2,260 14,119 16,379 Commercial loans - - 275 275 30,412 30,687 Other loans secured - - 544 544 45,344 45,888 Home equity lines of credit - - 100 100 34,306 34,406 Consumer and installment loans 10 - - 10 12,661 12,671 Total originated 10 - 5,069 5,079 694,541 699,620 Acquired: Residential - - 1,778 1,778 56,830 58,608 Commercial - - 1,087 1,087 75,601 76,688 Commercial loans - - - - 589 589 Other loans secured - - - - 168 168 Home equity lines of credit 46 - 296 342 5,410 5,752 Consumer and installment loans - - - - 189 189 Total acquired 46 - 3,161 3,207 138,787 141,994 Total $ 56 $ - $ 8,230 $ 8,286 $ 833,328 $ 841,614 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): December 31, 2017 Pass Special Mention Substandard Doubtful Total Originated: Residential $ 152,995 $ 271 $ 1,842 $ - $ 155,108 Commercial 401,371 - 3,110 - 404,481 Construction 14,119 - 2,260 - 16,379 Commercial loans 28,024 - 2,663 - 30,687 Other loans secured 40,657 - 5,231 - 45,888 Home equity lines of credit 34,306 55 45 - 34,406 Consumer and installment loans 12,661 10 - - 12,671 Total originated 684,133 336 15,151 - 699,620 Acquired: Residential 57,864 109 635 - 58,608 Commercial 74,687 - 2,001 - 76,688 Commercial loans 589 - - - 589 Other loans secured 168 - - - 168 Home equity lines of credit 5,286 - 466 - 5,752 Consumer and installment loans 189 - - - 189 Total acquired 138,783 109 3,102 - 141,994 Total $ 822,916 $ 445 $ 18,253 $ - $ 841,614 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 December 31, 2017 and June 30, 2017 is as follows (in thousands): December 31, June 30, 2017 2017 Residential $ 1,252 $ 1,298 Commercial 1,493 1,824 Home equity lines of credit 173 177 Consumer and installment loans 20 42 Carrying amount, net of allowance of $65 and $26, respectively $ 2,938 $ 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 December 31, Six Months Ended December 31, 2017 2016 2017 2016 Beginning balance $ 375 $ 532 $ 403 $ 578 New loans acquired - - - - Accretion income (24 ) (46 ) (52 ) (92 ) Reclassification from non-accretable difference - - - - Disposals (113 ) - (113 ) - Ending balance $ 238 $ 486 $ 238 $ 486

Other Comprehensive Income (L23

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Dec. 31, 2017
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 October 1, 2017 $ (195 ) $ (4,883 ) $ (244 ) $ (5,322 ) Other comprehensive loss before reclassifications (717 ) - - (717 ) Amounts reclassified from accumulated other comprehensive income - 181 8 189 Tax effect 243 (61 ) (2 ) 180 Net other comprehensive (loss) income (474 ) 120 6 (348 ) Balance at December 31, 2017 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) Net unrealized gain (loss) on available for sale securities Unrealized loss on pension benefits Unrealized loss on SERP benefits Total Balance at October 1, 2016 $ 624 $ (7,683 ) $ (810 ) $ (7,869 ) Other comprehensive loss before reclassifications (1,262 ) - - (1,262 ) Amounts reclassified from accumulated other comprehensive income - 577 47 624 Tax effect 429 (196 ) (16 ) 217 Net other comprehensive (loss) income (833 ) 381 31 (421 ) Balance at December 31, 2016 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 ) 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 (930 ) - - (930 ) Amounts reclassified from accumulated other comprehensive (loss) income (139 ) 362 16 239 Tax effect 363 (123 ) (4 ) 236 Net other comprehensive (loss) income (706 ) 239 12 (455 ) Balance at December 31, 2017 $ (669 ) $ (4,763 ) $ (238 ) $ (5,670 ) 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 before reclassifications (1,109 ) - - (1,109 ) Amounts reclassified from accumulated other comprehensive income - 577 47 624 Tax effect 377 (196 ) (16 ) 165 Net other comprehensive (loss) income (732 ) 381 31 (320 ) Balance at December 31, 2016 $ (209 ) $ (7,302 ) $ (779 ) $ (8,290 )

Post-Retirement Benefits (Table

Post-Retirement Benefits (Tables)	6 Months Ended
	Dec. 31, 2017
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 six months ended December 31, 2017 and 2016 (in thousands): Three Months Ended Three Months Ended December 31, 2017 December 31, 2016 Defined Benefit Plan Supplemental Retirement Plans Defined Benefit Plan Supplemental Retirement Plans Service cost $ - $ 107 $ 184 $ 81 Interest cost 242 25 253 29 Expected return on plan assets (503 ) - (464 ) - Amortization of prior net loss - - 361 23 Amortization of prior service cost 181 8 (72 ) - Net periodic (benefit) cost $ (80 ) $ 140 $ 262 $ 133 Six Months Ended Six Months Ended December 31, 2017 December 31, 2016 Defined Benefit Plan Supplemental Retirement Plan Defined Benefit Plan Supplemental Retirement Plan Service cost $ - $ 220 $ 369 $ 161 Interest cost 484 50 507 58 Expected return on plan assets (1,006 ) - (962 ) - Amortization of prior net loss - - 721 47 Amortization of prior service cost 362 16 (144 ) - Net periodic cost $ (160 ) $ 66 $ 491 $ 266
Shares Held by ESOP	Shares held by the ESOP include the following: December 31, 2017 June 30, 2017 Allocated 96,881 - Committed to be allocated - 26,975 Unallocated 1,356,328 1,426,234 Total shares 1,453,209 1,453,209

Fair Value of Financial Instr25

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017: Measured on a recurring basis: Available for sale securities: U.S. Government and agency obligations $ - $ 55,024 $ - $ 55,024 Corporate and other debt securities - 8,362 - 8,362 Mortgage-backed securities – residential - 39,296 - 39,296 Equity securities - 32 - 32 Total assets at fair value $ - $ 102,714 $ - $ 102,714 Measured on a non-recurring basis: Impaired loans: Residential mortgages $ - $ - $ 265 $ 265 Construction - - 1,984 1,984 Commercial loans - - 206 206 Other loans secured - - 500 500 Home equity lines of credit - - 72 72 Total assets at fair value $ - $ - $ 3,027 $ 3,027 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 December 31, 2017 and June 30, 2017 (dollars in thousands): Valuation Unobservable Range or Fair Value Technique(s) Input(s) Rate Used December 31, 2017: Impaired loans - residential mortgages $ 265 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% Impaired loans - construction 1,984 Sales contract n/a n/a Impaired loans - commercial loans 206 Discounted cash flow Discount rate 6.0% Impaired loans - other loans secured 500 Sales contract n/a n/a Impaired loans - home equity lines of credit 72 Sales comparison Adjustments for differences in sales comparables 4.2% to 21.1% 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 December 31, 2017: Financial assets: Cash and cash equivalents $ 77,106 $ 77,106 $ - $ - $ 77,106 Investment securities held to maturity 367,646 - 363,253 204 363,457 Investment securities available for sale 102,714 - 102,714 - 102,714 Loans receivable, net 838,120 - - 834,729 834,729 Accrued interest receivable 4,001 - 1,291 2,710 4,001 Federal Home Loan Bank stock 2,395 N/A N/A N/A N/A Financial liabilities: Demand, NOW, money market deposits and savings accounts 802,782 802,782 - - 802,782 Time deposits 311,547 - 314,386 - 314,386 Mortgage escrow funds 8,229 8,229 - - 8,229 FHLB advances 30,720 - 30,633 - 30,633 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)	6 Months Ended
	Dec. 31, 2017
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 December 31, 2017 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 December 31, 2017: PCSB Bank Leverage (Tier 1) $ 195,169 13.8 % $ 56,400 4.0 % $ 70,500 5.0 % Risk-based: Common Tier 1 195,169 21.6 40,591 4.5 58,632 6.5 Tier 1 195,169 21.6 54,122 6.0 72,162 8.0 Total 199,640 22.1 72,162 8.0 90,203 10.0 PCSB Financial Corporation Leverage (Tier 1) $ 282,716 19.9 % $ 56,713 4.0 % N/A N/A Risk-based: Common Tier 1 282,716 31.3 40,632 4.5 N/A N/A Tier 1 282,716 31.3 54,176 6.0 N/A N/A Total 287,187 31.8 72,234 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

Schedule of Earnings Per Share

Schedule of Earnings Per Share (Tables)	6 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	Three months ended December 31, 2017 Six months ended December 31, 2017 (amounts in thousands, except share and per share data) Net income applicable to common stock $ 2 $ 1,758 Average number of common shares outstanding 18,165,110 18,165,110 Less: Average unallocated ESOP shares 1,373,805 1,391,227 Average number of common shares outstanding used to calculate basic earnings per common share 16,791,305 16,773,883 Earnings per Common share: Basic $ 0.00 $ 0.10 Diluted $ 0.00 $ 0.10

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Dec. 31, 2017Subsidiary
Basis Of Presentation [Abstract]
Number of subsidiaries	3

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Apr. 20, 2017	Dec. 31, 2017	Jun. 30, 2017	Apr. 19, 2017	Dec. 31, 2016
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	Dec. 31, 2017	Jun. 30, 2017
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	$ 103,726	$ 111,832
Available for sale, Gross Unrealized/Unrecognized Gains	140	452
Available for sale, Gross Unrealized/Unrecognized Losses	(1,152)	(395)
Available for sale, Fair Value	102,714	111,889
Held to maturity, Amortized Cost	367,646	383,551
Held to maturity, Gross Unrealized/Unrecognized Gains	311	1,409
Held to maturity, Gross Unrealized/Unrecognized Losses	(4,500)	(1,372)
Held to maturity, Fair Value	363,457	383,588
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	55,569	63,630
Available for sale, Gross Unrealized/Unrecognized Gains		31
Available for sale, Gross Unrealized/Unrecognized Losses	(545)	(216)
Available for sale, Fair Value	55,024	63,445
Held to maturity, Amortized Cost	136,060	155,559
Held to maturity, Gross Unrealized/Unrecognized Gains		23
Held to maturity, Gross Unrealized/Unrecognized Losses	(1,377)	(574)
Held to maturity, Fair Value	134,683	155,008
Corporate and Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	8,433	8,460
Available for sale, Gross Unrealized/Unrecognized Gains	6	58
Available for sale, Gross Unrealized/Unrecognized Losses	(77)	(36)
Available for sale, Fair Value	8,362	8,482
Held to maturity, Amortized Cost	4,000	999
Held to maturity, Gross Unrealized/Unrecognized Losses	(129)
Held to maturity, Fair Value	3,871	999
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale, Amortized Cost	39,692	39,710
Available for sale, Gross Unrealized/Unrecognized Gains	134	363
Available for sale, Gross Unrealized/Unrecognized Losses	(530)	(143)
Available for sale, Fair Value	39,296	39,930
Held to maturity, Amortized Cost	140,411	143,452
Held to maturity, Gross Unrealized/Unrecognized Gains	141	828
Held to maturity, Gross Unrealized/Unrecognized Losses	(1,771)	(497)
Held to maturity, Fair Value	138,781	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	55,829	59,476
Held to maturity, Gross Unrealized/Unrecognized Gains	4	146
Held to maturity, Gross Unrealized/Unrecognized Losses	(892)	(235)
Held to maturity, Fair Value	54,941	59,387
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Held to maturity, Amortized Cost	31,346	24,065
Held to maturity, Gross Unrealized/Unrecognized Gains	166	412
Held to maturity, Gross Unrealized/Unrecognized Losses	(331)	(66)
Held to maturity, Fair Value	$ 31,181	$ 24,411

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended	6 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)	Dec. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)	Jun. 30, 2017USD ($)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		78,200,000		$ 95,500,000
Total investment securities		$ 470,360,000		$ 495,440,000
Number of securities in unrealized loss position | Security		227		156
Fair value of securities in unrealized loss position		$ 421,200,000		$ 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	Dec. 31, 2017	Jun. 30, 2017
Investments Debt And Equity Securities [Abstract]
1 year or less	$ 37,492
1 to 5 years	98,568
Mortgage-backed securities and other	231,586
Held to maturity, Amortized Cost	367,646	$ 383,551
1 year or less	37,402
1 to 5 years	97,280
Mortgage-backed securities and other	228,775
Total	363,457	$ 383,588
1 year or less	11,018
1 to 5 years	50,984
5 to 10 years	2,000
Mortgage-backed securities and other	39,692
Total	103,694
1 year or less	10,981
1 to 5 years	50,444
5 to 10 years	1,961
Mortgage-backed securities and other	39,296
Total	$ 102,682

Investment Securities - Investm

Investment Securities - Investment Securities with Fair Value and Unrealized Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	$ 61,414	$ 62,725
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(644)	(347)
Available for sale, 12 months or greater, Fair Value	31,397	7,193
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(508)	(48)
Available for sale, Total, Fair Value	92,811	69,918
Available for sale, Total, Unrealized/Unrecognized Loss	(1,152)	(395)
Held to maturity, Less than 12 months, Fair Value	213,278	189,978
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(2,396)	(1,205)
Held to maturity, 12 months or greater, Fair Value	115,144	12,051
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(2,104)	(167)
Held to maturity, Total, Fair Value	328,422	202,029
Held to maturity, Total, Unrealized/ Unrecognized Loss	(4,500)	(1,372)
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	34,231	41,900
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(267)	(200)
Available for sale, 12 months or greater, Fair Value	20,793	3,993
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(278)	(16)
Available for sale, Total, Fair Value	55,024	45,893
Available for sale, Total, Unrealized/Unrecognized Loss	(545)	(216)
Held to maturity, Less than 12 months, Fair Value	60,450	113,511
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(587)	(531)
Held to maturity, 12 months or greater, Fair Value	67,232	5,981
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(790)	(43)
Held to maturity, Total, Fair Value	127,682	119,492
Held to maturity, Total, Unrealized/ Unrecognized Loss	(1,377)	(574)
Corporate and Other Debt Securities [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	6,336	1,964
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(77)	(36)
Available for sale, Total, Fair Value	6,336	1,964
Available for sale, Total, Unrealized/Unrecognized Loss	(77)	(36)
Held to maturity, Less than 12 months, Fair Value	3,871	999
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(129)
Held to maturity, Total, Fair Value	3,871	999
Held to maturity, Total, Unrealized/ Unrecognized Loss	(129)
Mortgage-backed Securities - Residential [Member]
Schedule of Investments [Line Items]
Available for sale, Less than 12 months, Fair Value	20,847	18,861
Available for sale, Less than 12 months, Unrealized/Unrecognized Loss	(300)	(111)
Available for sale, 12 months or greater, Fair Value	10,604	3,200
Available for sale, 12 months or greater, Unrealized/Unrecognized Loss	(230)	(32)
Available for sale, Total, Fair Value	31,451	22,061
Available for sale, Total, Unrealized/Unrecognized Loss	(530)	(143)
Held to maturity, Less than 12 months, Fair Value	95,903	39,754
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(993)	(467)
Held to maturity, 12 months or greater, Fair Value	27,052	1,626
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(778)	(30)
Held to maturity, Total, Fair Value	122,955	41,380
Held to maturity, Total, Unrealized/ Unrecognized Loss	(1,771)	(497)
Mortgage-backed Securities - Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Held to maturity, Less than 12 months, Fair Value	41,965	26,622
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(561)	(141)
Held to maturity, 12 months or greater, Fair Value	11,973	4,444
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(331)	(94)
Held to maturity, Total, Fair Value	53,938	31,066
Held to maturity, Total, Unrealized/ Unrecognized Loss	(892)	(235)
Mortgage-backed Securities - Commercial [Member]
Schedule of Investments [Line Items]
Held to maturity, Less than 12 months, Fair Value	11,089	9,092
Held to maturity, Less than 12 months, Unrealized/ Unrecognized Loss	(126)	(66)
Held to maturity, 12 months or greater, Fair Value	8,887
Held to maturity, 12 months or greater, Unrealized/ Unrecognized Loss	(205)
Held to maturity, Total, Fair Value	19,976	9,092
Held to maturity, Total, Unrealized/ Unrecognized Loss	$ (331)	$ (66)

Loans Receivable - Summary of L

Loans Receivable - Summary of Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	$ 841,614		$ 813,624
Loans receivable	842,591		814,798
Allowance for loan losses	(4,471)	$ (5,268)	(5,150)	$ (4,628)	$ (4,065)	$ (4,042)
Loans receivable, net	838,120		809,648
Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	213,716		217,778
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	481,169		437,651
Allowance for loan losses	(2,686)		(2,589)
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	16,379		22,404
Allowance for loan losses	(400)		(1,150)
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	31,276		33,297
Allowance for loan losses	(322)		(440)
Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	46,056		46,802
Allowance for loan losses	(389)		(365)
Home Equity Lines Of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	40,158		41,927
Allowance for loan losses	(74)		(76)
Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans receivable, before fees	12,860		13,765
Allowance for loan losses	(133)		(144)
Mortgage Receivable
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan origination costs	210		397
Loans receivable	711,474		678,230
Commercial And Consumer Loan
Loans and Leases Receivable Disclosure [Line Items]
Net deferred loan origination costs	767		777
Loans receivable	$ 131,117		$ 136,568

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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	$ 5,268	$ 4,065	$ 5,150	$ 4,042
Allowance for Loan Losses, Provision (credit)	200	562	335	588
Allowance for Loan Losses, Charge-offs	(997)	(400)	(1,014)	(762)
Allowance for Loan Losses, Recoveries		401		760
Allowance for Loan Losses, Ending Allowance	4,471	4,628	4,471	4,628
Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			2,589
Allowance for Loan Losses, Ending Allowance	2,686		2,686
Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			1,150
Allowance for Loan Losses, Ending Allowance	400		400
Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			440
Allowance for Loan Losses, Ending Allowance	322		322
Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance			365
Allowance for Loan Losses, Ending Allowance	389		389
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	74		74
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	133		133
Originated [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	407	238	360	237
Allowance for Loan Losses, Provision (credit)	(5)		59	(69)
Allowance for Loan Losses, Charge-offs			(17)
Allowance for Loan Losses, Recoveries				70
Allowance for Loan Losses, Ending Allowance	402	238	402	238
Originated [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	2,709	2,121	2,589	2,149
Allowance for Loan Losses, Provision (credit)	(23)	909	97	863
Allowance for Loan Losses, Recoveries		1		19
Allowance for Loan Losses, Ending Allowance	2,686	3,031	2,686	3,031
Originated [Member] | Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	1,160	302	1,150	269
Allowance for Loan Losses, Provision (credit)	237	34	247	67
Allowance for Loan Losses, Charge-offs	(997)		(997)
Allowance for Loan Losses, Ending Allowance	400	336	400	336
Originated [Member] | Commercial Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	345	559	440	604
Allowance for Loan Losses, Provision (credit)	(23)	(458)	(118)	(676)
Allowance for Loan Losses, Recoveries		400		573
Allowance for Loan Losses, Ending Allowance	322	501	322	501
Originated [Member] | Other Loans Secured [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	404	361	365	397
Allowance for Loan Losses, Provision (credit)	(15)	(22)	24	168
Allowance for Loan Losses, Charge-offs				(324)
Allowance for Loan Losses, Recoveries				98
Allowance for Loan Losses, Ending Allowance	389	339	389	339
Originated [Member] | Home Equity Lines Of Credit [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	77	70	76	73
Allowance for Loan Losses, Provision (credit)	(3)		(2)	(3)
Allowance for Loan Losses, Ending Allowance	74	70	74	70
Originated [Member] | Consumer And Installment Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	140	414	144	313
Allowance for Loan Losses, Provision (credit)	(7)	97	(11)	198
Allowance for Loan Losses, Charge-offs		(398)		(398)
Allowance for Loan Losses, Ending Allowance	133	113	133	113
Acquired [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Allowance for Loan Losses, Beginning Allowance	26		26
Allowance for Loan Losses, Provision (credit)	39		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)		2		2
Allowance for Loan Losses, Charge-offs		$ (2)		$ (2)

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	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	$ 13,193		$ 17,322
Loans, Collectively Evaluated for Impairment	825,418		792,935
Total	841,614		813,624
Allowance for Loan Losses, Individually Evaluated for Impairment	548		1,142
Allowance for Loan Losses, Collectively Evaluated for Impairment	3,858		3,982
Allowance for Loan Losses, Total	4,471	$ 5,268	5,150	$ 4,628	$ 4,065	$ 4,042
Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	3,003		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	4,471		5,150
Residential [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	3,499		4,471
Loans, Collectively Evaluated for Impairment	208,900		211,983
Total	213,716		217,778
Allowance for Loan Losses, Individually Evaluated for Impairment	190		131
Allowance for Loan Losses, Collectively Evaluated for Impairment	212		229
Residential [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	1,317		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	467		386
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Individually Evaluated for Impairment	2,438		2,411
Loans, Collectively Evaluated for Impairment	477,238		433,416
Total	481,169		437,651
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,686		2,589
Allowance for Loan Losses, Total	2,686		2,589
Commercial [Member] | Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, Acquired With Deteriorated Credit Quality	1,493		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	14,119		18,743
Total	16,379		22,404
Allowance for Loan Losses, Individually Evaluated for Impairment	276		997
Allowance for Loan Losses, Collectively Evaluated for Impairment	124		153
Allowance for Loan Losses, Total	400		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	351		356
Loans, Collectively Evaluated for Impairment	30,925		32,941
Total	31,276		33,297
Allowance for Loan Losses, Individually Evaluated for Impairment	75		7
Allowance for Loan Losses, Collectively Evaluated for Impairment	247		433
Allowance for Loan Losses, Total	322		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	4,165		5,813
Loans, Collectively Evaluated for Impairment	41,891		40,989
Total	46,056		46,802
Allowance for Loan Losses, Individually Evaluated for Impairment	2		2
Allowance for Loan Losses, Collectively Evaluated for Impairment	387		363
Allowance for Loan Losses, Total	389		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	480		610
Loans, Collectively Evaluated for Impairment	39,505		41,140
Total	40,158		41,927
Allowance for Loan Losses, Individually Evaluated for Impairment	5		5
Allowance for Loan Losses, Collectively Evaluated for Impairment	69		71
Allowance for Loan Losses, Total	74		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	173		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	12,840		13,723
Total	12,860		13,765
Allowance for Loan Losses, Collectively Evaluated for Impairment	133		144
Allowance for Loan Losses, Total	133		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	20		42
Allowance for Loan Losses, Acquired With Deteriorated Credit Quality	$ 0		$ 0

Loans Receivable - Summary of37

Loans Receivable - Summary of Loans Individually Evaluated for Impairment (Excluding Loans Acquired with Deteriorated Credit Quality) by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable Impaired [Line Items]
Impaired loans, unpaid principal balance	$ 19,362	$ 22,440
Impaired loans, recorded investment	13,193	17,322
Allowance for loan losses	548	1,142
Residential [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	2,940	4,216
Impaired loans with no related allowance recorded, recorded investment	2,721	4,014
Impaired loans with a related allowance recorded, unpaid principal balance	747	395
Impaired loans with a related allowance recorded, recorded investment	778	457
Impaired loans, recorded investment	3,499	4,471
Allowance for loan losses	190	131
Commercial [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	2,948	2,935
Impaired loans with no related allowance recorded, recorded investment	2,438	2,411
Impaired loans, recorded investment	2,438	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	351	79
Impaired loans with a related allowance recorded, recorded investment	351	79
Impaired loans, recorded investment	351	356
Allowance for loan losses	75	7
Other Loans Secured [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	7,558	9,157
Impaired loans with no related allowance recorded, recorded investment	3,088	4,702
Impaired loans with a related allowance recorded, unpaid principal balance	1,077	1,111
Impaired loans with a related allowance recorded, recorded investment	1,077	1,111
Impaired loans, recorded investment	4,165	5,813
Allowance for loan losses	2	2
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, unpaid principal balance	473	599
Impaired loans with no related allowance recorded, recorded investment	469	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	480	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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Impaired [Line Items]
Impaired loans average recorded investment	$ 14,776	$ 15,422	$ 15,906	$ 15,492
Impaired loans interest income recognized	264	126	455	255
Residential [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	3,027	3,725	3,431	3,753
Impaired loans with no related allowance recorded, interest income recognized	124	3	166	6
Impaired loans with a related allowance recorded, average recorded investment	778		686
Impaired loans with a related allowance recorded, interest income recognized	3		7
Commercial [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	2,454	2,303	2,447	2,311
Impaired loans with no related allowance recorded, interest income recognized	27	31	54	63
Impaired loans with a related allowance recorded, average recorded investment		3,132		3,141
Impaired loans with a related allowance recorded, interest income recognized		25		52
Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment		91		92
Impaired loans with no related allowance recorded, interest income recognized		1		2
Impaired loans with a related allowance recorded, average recorded investment	352		353
Impaired loans with a related allowance recorded, interest income recognized			4
Other Loans Secured [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	3,488	5,489	4,002	5,513
Impaired loans with no related allowance recorded, interest income recognized	77	66	160	134
Impaired loans with a related allowance recorded, average recorded investment	1,087		1,095
Impaired loans with a related allowance recorded, interest income recognized	13		27
Home Equity Lines Of Credit [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment	571	551	593	551
Impaired loans with no related allowance recorded, interest income recognized	20		20	(2)
Impaired loans with a related allowance recorded, average recorded investment	11		11
Construction [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, average recorded investment			173
Impaired loans with no related allowance recorded, interest income recognized			17
Impaired loans with a related allowance recorded, average recorded investment	$ 3,008	$ 131	$ 3,115	$ 131

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	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 8,191	$ 12,072
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,772	2,581
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	258
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	1,368	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	1,281	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	$ 369	$ 296

Loans Receivable - Additional I

Loans Receivable - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Dec. 31, 2017USD ($)Loan	Dec. 31, 2016Loan	Dec. 31, 2017USD ($)Loan	Dec. 31, 2016Loan	Jun. 30, 2017USD ($)Loan
Loans And Leases Receivable Disclosure [Abstract]
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	17		17		20
Value of loans classified as troubled debt restructurings	$ 7,100,000		$ 7,100,000		$ 9,900,000
Specific reserves	$ 211,000		$ 211,000		$ 145,000
Troubled debt restructurings for which there was a payment default | Loan	0	0	2	0
Troubled debt restructurings with carrying amount			$ 1,100,000
Increase allowance for loan loss			66,000
Troubled debt restructurings with carrying amount cured			$ 800,000
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		$ 39,000

Loans Receivable - Aging of Rec

Loans Receivable - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 8,286	$ 10,371
Current	833,328	803,253
Total	841,614	813,624
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	56	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	8,230	9,103
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	213,716	217,778
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	481,169	437,651
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	16,379	22,404
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	31,276	33,297
Other Loans Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	46,056	46,802
Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	40,158	41,927
Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	12,860	13,765
Originated [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,079	6,849
Current	694,541	651,286
Total	699,620	658,135
Originated [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10	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	5,069	6,281
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,632	2,342
Current	153,476	153,390
Total	155,108	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	1,632	1,973
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	258
Current	404,223	355,247
Total	404,481	355,247
Originated [Member] | Commercial [Member] | 90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	258
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,260	3,661
Current	14,119	18,743
Total	16,379	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	30,412	31,613
Total	30,687	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	544	544
Current	45,344	43,612
Total	45,888	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	544	544
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	100	302
Current	34,306	35,246
Total	34,406	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]
Total Past Due	10
Current	12,661	13,435
Total	12,671	13,435
Originated [Member] | Consumer And Installment Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10
Acquired [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,207	3,522
Current	138,787	151,967
Total	141,994	155,489
Acquired [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	46	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	3,161	2,822
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,778	2,172
Current	56,830	59,874
Total	58,608	62,046
Acquired [Member] | Residential [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		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	1,778	1,472
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,087	1,054
Current	75,601	81,350
Total	76,688	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	168	2,646
Total	168	2,646
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	342	296
Current	5,410	6,083
Total	5,752	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	46
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	189	330
Total	$ 189	$ 330

Loans Receivable - Summary of R

Loans Receivable - Summary of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 841,614	$ 813,624
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	822,916	788,286
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	445	192
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,253	25,146
Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	213,716	217,778
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	481,169	437,651
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,379	22,404
Commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	31,276	33,297
Other Loans Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	46,056	46,802
Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,158	41,927
Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,860	13,765
Originated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	699,620	658,135
Originated [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	684,133	638,973
Originated [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	336	192
Originated [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,151	18,970
Originated [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	155,108	155,732
Originated [Member] | Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	152,995	153,165
Originated [Member] | Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	271
Originated [Member] | Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,842	2,567
Originated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	404,481	355,247
Originated [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	401,371	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	3,110	2,910
Originated [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,379	22,404
Originated [Member] | Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,119	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	30,687	31,613
Originated [Member] | Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,024	28,944
Originated [Member] | Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,663	2,669
Originated [Member] | Other Loans Secured [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	45,888	44,156
Originated [Member] | Other Loans Secured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,657	37,267
Originated [Member] | Other Loans Secured [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,231	6,889
Originated [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	34,406	35,548
Originated [Member] | Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	34,306	35,246
Originated [Member] | Home Equity Lines Of Credit [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	55	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	12,671	13,435
Originated [Member] | Consumer And Installment Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,661	13,405
Originated [Member] | Consumer And Installment Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10
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	141,994	155,489
Acquired [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	138,783	149,313
Acquired [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	109
Acquired [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,102	6,176
Acquired [Member] | Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	58,608	62,046
Acquired [Member] | Residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,864	58,665
Acquired [Member] | Residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	109
Acquired [Member] | Residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	635	3,381
Acquired [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	76,688	82,404
Acquired [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	74,687	80,082
Acquired [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,001	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	168	2,646
Acquired [Member] | Other Loans Secured [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	168	2,646
Acquired [Member] | Home Equity Lines Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,752	6,379
Acquired [Member] | Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,286	5,906
Acquired [Member] | Home Equity Lines Of Credit [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	466	473
Acquired [Member] | Consumer And Installment Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	189	330
Acquired [Member] | Consumer And Installment Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 189	$ 330

Loans Receivable - Schedule of

Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 838,120	$ 809,648
Acquired with Deteriorated Credit Quality [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	2,938	3,341
Acquired with Deteriorated Credit Quality [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,252	1,298
Acquired with Deteriorated Credit Quality [Member] | Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	1,493	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	173	177
Acquired with Deteriorated Credit Quality [Member] | Consumer And Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loans	$ 20	$ 42

Loans Receivable - Schedule o44

Loans Receivable - Schedule of Carrying Amount of Purchased Credit Impaired Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	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 of45

Loans Receivable - Summary of Accretable Yield, or Income Expected to be Collected for Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract]
Beginning balance	$ 375	$ 532	$ 403	$ 578
Accretion income	(24)	(46)	(52)	(92)
Disposals	(113)		(113)
Ending balance	$ 238	$ 486	$ 238	$ 486

Other Comprehensive Income (L46

Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 279,846	$ 109,949
Total other comprehensive (loss)	$ (348)	$ (421)	(455)	(320)
Ending Balance	282,411	112,757	282,411	112,757
Net Unrealized Gain (Loss) on Available for Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(195)	624	37	523
Other comprehensive loss before reclassifications	(717)	(1,262)	(930)	(1,109)
Amounts reclassified from accumulated other comprehensive income			(139)
Tax effect	243	429	363	377
Total other comprehensive (loss)	(474)	(833)	(706)	(732)
Ending Balance	(669)	(209)	(669)	(209)
Unrealized Losses on Retirement Plans [Member] | Pension Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,883)	(7,683)	(5,002)	(7,683)
Amounts reclassified from accumulated other comprehensive income	181	577	362	577
Tax effect	(61)	(196)	(123)	(196)
Total other comprehensive (loss)	120	381	239	381
Ending Balance	(4,763)	(7,302)	(4,763)	(7,302)
Unrealized Losses on Retirement Plans [Member] | SERP Benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(244)	(810)	(250)	(810)
Amounts reclassified from accumulated other comprehensive income	8	47	16	47
Tax effect	(2)	(16)	(4)	(16)
Total other comprehensive (loss)	6	31	12	31
Ending Balance	(238)	(779)	(238)	(779)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(5,322)	(7,869)	(5,215)	(7,970)
Other comprehensive loss before reclassifications	(717)	(1,262)	(930)	(1,109)
Amounts reclassified from accumulated other comprehensive income	189	624	239	624
Tax effect	180	217	236	165
Total other comprehensive (loss)	(348)	(421)	(455)	(320)
Ending Balance	$ (5,670)	$ (8,290)	$ (5,670)	$ (8,290)

Post-Retirement Benefits - Addi

Post-Retirement Benefits - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	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			4.00%
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	$ 25,800,000		$ 25,800,000
ESOP Compensation	$ 672,000	$ 0	$ 1,279,000	$ 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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Employee Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 184		$ 369
Interest cost	$ 242	253	$ 484	507
Expected return on plan assets	(503)	(464)	(1,006)	(962)
Amortization of prior net loss		361		721
Amortization of prior service cost	181	(72)	362	(144)
Net periodic (benefit) cost	(80)	262	(160)	491
Supplemental Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	107	81	220	161
Interest cost	25	29	50	58
Amortization of prior net loss		23		47
Amortization of prior service cost	8		16
Net periodic (benefit) cost	$ 140	$ 133	$ 66	$ 266

Post-Retirement Benefits - Shar

Post-Retirement Benefits - Shares Held by ESOP (Detail) - shares	Dec. 31, 2017	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Allocated	96,881
Committed to be allocated		26,975
Unallocated	1,356,328	1,426,234
Total shares	1,453,209	1,453,209

Fair Value of Financial Instr50

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 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	838,120,000		838,120,000			$ 809,648,000
Remaining valuation allowance	4,471,000	$ 4,628,000	4,471,000	$ 4,628,000	$ 5,268,000	5,150,000	$ 4,065,000	$ 4,042,000
Net charge-offs	997,000	400,000	1,014,000	762,000
Provision for loan losses	200,000	562,000	335,000	$ 588,000
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	$ 405,000		405,000			$ 1,100,000
Net charge-offs		38,000	997,000
Provision for loan losses		$ 814,000	$ 405,000
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 Instr51

Fair Value of Financial Instruments - Summary of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	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	$ 102,714	$ 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	55,024	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	8,362	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	39,296	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	102,714	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	55,024	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	8,362	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	39,296	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	3,027	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	265	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	206	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	72	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		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	3,027	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	265	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	206	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	$ 72	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		$ 977

Fair Value of Financial Instr52

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	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 3,027	$ 6,049
Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	3,027	$ 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	265	$ 1,126
Impaired Loans [Member] | Residential [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 265	$ 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	4.20%	(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)	n/a	Discount for distressed property
Range or Rate Used		50.00%
Impaired Loans [Member] | Commercial Loans [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 206	$ 72
Impaired Loans [Member] | Commercial Loans [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 206	$ 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	6.00%
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)	n/a	Discount rate
Range or Rate Used		6.00%
Impaired Loans [Member] | Home Equity Lines Of Credit [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 72	$ 5
Impaired Loans [Member] | Home Equity Lines Of Credit [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value	$ 72	$ 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		$ 977
Foreclosed Real Estate [Member] | Level 3 [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair Value		$ 977
Valuation Technique(s)		Sales comparison
Unobservable Input(s)		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		(23.40%)
Foreclosed Real Estate [Member] | Level 3 [Member] | Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Range or Rate Used		7.20%

Fair Value of Financial Instr53

Fair Value of Financial Instruments - Summary of Carrying Amounts and Estimated Fair Values of Bank's Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Financial assets:
Investment securities held to maturity	$ 363,457	$ 383,588
Investment securities available for sale	102,714	111,889
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	77,106	60,486
Investment securities held to maturity	367,646	383,551
Investment securities available for sale	102,714	111,889
Loans receivable, net	838,120	809,648
Accrued interest receivable	4,001	3,693
Federal Home Loan Bank stock	2,395	3,132
Financial liabilities:
Mortgage escrow funds	8,229	8,084
FHLB advances	30,720	42,598
Carrying Amount [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	802,782	793,681
Carrying Amount [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	311,547	294,780
Total [Member]
Financial assets:
Cash and cash equivalents	77,106	60,486
Investment securities held to maturity	363,457	383,588
Investment securities available for sale	102,714	111,889
Loans receivable, net	834,729	817,814
Accrued interest receivable	4,001	3,693
Financial liabilities:
Mortgage escrow funds	8,229	8,084
FHLB advances	30,633	45,504
Total [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	802,782	793,681
Total [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	314,386	297,508
Level 1 [Member]
Financial assets:
Cash and cash equivalents	77,106	60,486
Financial liabilities:
Mortgage escrow funds	8,229	8,084
Level 1 [Member] | Demand, NOW, Money Market Deposits and Savings Accounts [Member]
Financial liabilities:
Time deposits	802,782	793,681
Level 2 [Member]
Financial assets:
Investment securities held to maturity	363,253	383,318
Investment securities available for sale	102,714	111,889
Accrued interest receivable	1,291	1,243
Financial liabilities:
FHLB advances	30,633	45,504
Level 2 [Member] | Time Deposits [Member]
Financial liabilities:
Time deposits	314,386	297,508
Level 3 [Member]
Financial assets:
Investment securities held to maturity	204	270
Loans receivable, net	834,729	817,814
Accrued interest receivable	$ 2,710	$ 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	Dec. 31, 2017	Jun. 30, 2017
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Leverage (Tier 1), Bank Actual Amount	$ 282,716	$ 278,528
Common Tier 1, Bank Actual Amount	282,716	278,528
Tier 1, Bank Actual Amount	282,716	278,528
Total, Bank Actual Amount	$ 287,187	$ 283,678
Leverage (Tier 1), Bank Actual Ratio	19.90%	20.00%
Common Tier 1, Bank Actual Ratio	31.30%	31.60%
Tier 1, Bank Actual Ratio	31.30%	31.60%
Total, Bank Actual Ratio	31.80%	32.20%
Leverage (Tier 1), For Capital Adequacy Purposes Amount	$ 56,713	$ 55,839
Common Tier 1, For Capital Adequacy Purposes Amount	40,632	39,631
Tier 1, For Capital Adequacy Purposes Amount	54,176	52,841
Total, For Capital Adequacy Purposes Amount	$ 72,234	$ 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	$ 195,169	$ 190,990
Common Tier 1, Bank Actual Amount	195,169	190,990
Tier 1, Bank Actual Amount	195,169	190,990
Total, Bank Actual Amount	$ 199,640	$ 196,140
Leverage (Tier 1), Bank Actual Ratio	13.80%	13.70%
Common Tier 1, Bank Actual Ratio	21.60%	21.70%
Tier 1, Bank Actual Ratio	21.60%	21.70%
Total, Bank Actual Ratio	22.10%	22.30%
Leverage (Tier 1), For Capital Adequacy Purposes Amount	$ 56,400	$ 55,949
Common Tier 1, For Capital Adequacy Purposes Amount	40,591	39,631
Tier 1, For Capital Adequacy Purposes Amount	54,122	52,841
Total, For Capital Adequacy Purposes Amount	$ 72,162	$ 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	$ 70,500	$ 69,936
Common Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	58,632	57,245
Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	72,162	70,455
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 90,203	$ 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)	6 Months Ended
	Dec. 31, 2017	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	1.25%	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	6 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Apr. 19, 2017	Dec. 31, 2016
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		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income	$ 2	$ 1,672	$ 1,758	$ 3,128
Average number of common shares outstanding	18,165,110		18,165,110
Less: Average unallocated ESOP shares	1,373,805		1,391,227
Average number of common shares outstanding used to calculate basic earnings per common share	16,791,305		16,773,883
Earnings per Common share:
Basic	$ 0		$ 0.10
Diluted	$ 0		$ 0.10

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Corporate income tax rate	21.00%	34.00%
Re-measurement charge through income tax expense			$ 1.8	$ 1.8
Effective date for change in corporate income tax rate				Jan. 1, 2018
Maximum [Member]
Income Taxes [Line Items]
Measurement revision period				1 year