Basis of Presentation	9 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Note 1. Basis of Presentation Nature of Operations: PCSB Financial Corporation (the “Holding Company” and together with its direct and indirect subsidiaries, the “Company”) is a Maryland corporation organized by PCSB Bank (the “Bank”) for the purpose of acquiring all of the capital stock of the Bank issued in the Bank's conversion to stock ownership on April 20, 2017. At March 31, 2020, the significant assets of the Holding Company were the capital stock of the Bank, cash deposited in the Bank, and a loan to the PCSB Bank Employee Stock Ownership Plan (“ESOP”). The liabilities of the Holding Company were insignificant. The Company is subject to the financial reporting requirements of the Securities Exchange Act of 1934, as amended and regulation and examination by the Board of Governors of the Federal Reserve System (the “Federal Reserve Board”) and the New York State Department of Financial Services (the “NYSDFS”). 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 commercial 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 NYSDFS. Basis of Presentation: The unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), and include the accounts of the Holding Company, the Bank and the Bank's two subsidiaries – PCSB Funding Corp. and UpCounty Realty Corp. (formerly PCSB Realty Ltd.). PCSB Funding Corp. is a real estate investment trust that holds certain mortgage assets. UpCounty Realty Corp. is a corporation that holds certain properties foreclosed upon by the Bank. All intercompany transactions and balances have been eliminated in consolidation. 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 results of operations for the current period presented are not necessarily indicative of the results of operations that may be expected for the entire current fiscal year. Certain information and note disclosures normally included in 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 consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended June 30, 2019, included in the Company's Annual Report on Form 10-K. Certain prior period amounts have been reclassified to conform to the current presentation. Reclassifications had no effect on prior period net income or equity. Risks and Uncertainties: The COVID-19 pandemic has created extensive disruptions to the global and U.S. economies and to the lives of individuals throughout the world. The New York City Metropolitan area and environs have the highest incidence of COVID-19 in the nation, and the neighboring Tri-State area of New Jersey and Connecticut also has been particularly affected by COVID-19. Governments, businesses, and the public are taking unprecedented actions to contain the spread of COVID-19 and to mitigate its effects, including quarantines, travel bans, shelter-in-place orders, closures of businesses and schools, fiscal and monetary stimulus, and legislation designed to deliver financial aid and other relief. While the scope, duration, and full effects of COVID-19 are rapidly evolving and not fully known, the pandemic and the efforts to contain it have disrupted global economic activity, adversely affected the functioning of financial markets, impacted market interest rates, increased economic and market uncertainty, and disrupted trade and supply chains. The potential financial impact is unknown at this time. However, if these actions are sustained, it may adversely impact several industries within our geographic footprint and impair the ability of the Company’s customers to fulfill their contractual obligations to the Company. This could cause the Company to experience a material adverse effect on our business operations, asset valuations, financial condition, and results of operations. Material adverse impacts may include all or a combination of valuation impairments the Company’s intangible assets, investments, loans, or deferred tax assets. As it relates to the allowance for loan losses, the current quarter provision for loan losses includes a $1.7 million increase in qualitative reserves as the Company assessed the economic impacts the COVID-19 pandemic has had on our local economy and loan portfolio. The Company has taken actions to identify, assess and address its COVID-19 related credit exposure. Many factors are unknown, including the length of the resulting economic shutdown imposed by New York State and other neighboring states, the impacts of the government’s fiscal and monetary relief measures, including payment deferral programs, as well as the long-term impacts COVID-19 may have on our consumer and commercial borrowers. It is reasonably possible that the Company’s allowance for loan loss estimate as of March 31, 2020 will change in the near term and could result in a material change to the Company’s provision for loan losses, earnings and capital. Use of Estimates: To prepare financial statements in conformity with GAAP management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ.

Basis of Presentation

9 Months Ended

Mar. 31, 2020

Note 1. Basis of Presentation

Nature of Operations: PCSB Financial Corporation (the “Holding Company” and together with its direct and indirect subsidiaries, the “Company”) is a Maryland corporation organized by PCSB Bank (the “Bank”) for the purpose of acquiring all of the capital stock of the Bank issued in the Bank's conversion to stock ownership on April 20, 2017. At March 31, 2020, the significant assets of the Holding Company were the capital stock of the Bank, cash deposited in the Bank, and a loan to the PCSB Bank Employee Stock Ownership Plan (“ESOP”). The liabilities of the Holding Company were insignificant. The Company is subject to the financial reporting requirements of the Securities Exchange Act of 1934, as amended and regulation and examination by the Board of Governors of the Federal Reserve System (the “Federal Reserve Board”) and the New York State Department of Financial Services (the “NYSDFS”).

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 commercial 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 NYSDFS.

Basis of Presentation: The unaudited consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”), and include the accounts of the Holding Company, the Bank and the Bank's two subsidiaries – PCSB Funding Corp. and UpCounty Realty Corp. (formerly PCSB Realty Ltd.). PCSB Funding Corp. is a real estate investment trust that holds certain mortgage assets. UpCounty Realty Corp. is a corporation that holds certain properties foreclosed upon by the Bank. All intercompany transactions and balances have been eliminated in consolidation.

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 results of operations for the current period presented are not necessarily indicative of the results of operations that may be expected for the entire current fiscal year. Certain information and note disclosures normally included in 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 consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended June 30, 2019, included in the Company's Annual Report on Form 10-K.

Certain prior period amounts have been reclassified to conform to the current presentation. Reclassifications had no effect on prior period net income or equity.

Risks and Uncertainties:

The COVID-19 pandemic has created extensive disruptions to the global and U.S. economies and to the lives of individuals throughout the world. The New York City Metropolitan area and environs have the highest incidence of COVID-19 in the nation, and the neighboring Tri-State area of New Jersey and Connecticut also has been particularly affected by COVID-19. Governments, businesses, and the public are taking unprecedented actions to contain the spread of COVID-19 and to mitigate its effects, including quarantines, travel bans, shelter-in-place orders, closures of businesses and schools, fiscal and monetary stimulus, and legislation designed to deliver financial aid and other relief. While the scope, duration, and full effects of COVID-19 are rapidly evolving and not fully known, the pandemic and the efforts to contain it have disrupted global economic activity, adversely affected the functioning of financial markets, impacted market interest rates, increased economic and market uncertainty, and disrupted trade and supply chains.

The potential financial impact is unknown at this time. However, if these actions are sustained, it may adversely impact several industries within our geographic footprint and impair the ability of the Company’s customers to fulfill their contractual obligations to the Company. This could cause the Company to experience a material adverse effect on our business operations, asset valuations, financial condition, and results of operations. Material adverse impacts may include all or a combination of valuation impairments the Company’s intangible assets, investments, loans, or deferred tax assets.

As it relates to the allowance for loan losses, the current quarter provision for loan losses includes a $1.7 million increase in qualitative reserves as the Company assessed the economic impacts the COVID-19 pandemic has had on our local economy and loan portfolio. The Company has taken actions to identify, assess and address its COVID-19 related credit exposure. Many factors are unknown, including the length of the resulting economic shutdown imposed by New York State and other neighboring states, the impacts of the government’s fiscal and monetary relief measures, including payment deferral programs, as well as the long-term impacts COVID-19 may have on our consumer and commercial borrowers. It is reasonably possible that the Company’s allowance for loan loss estimate as of March 31, 2020 will change in the near term and could result in a material change to the Company’s provision for loan losses, earnings and capital.

Use of Estimates: To prepare financial statements in conformity with GAAP management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ.