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Regulatory Matters - Summary of Bank's Actual Capital Amounts and Ratios Compared to Required Ratios for Minimum Capital Adequacy and for Classification as Well Capitalized (Detail) - PCSB Bank [Member] - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Leverage (Tier 1), Bank Actual Amount $ 217,068 $ 209,885
Common Tier 1, Bank Actual Amount 217,068 209,885
Tier 1, Bank Actual Amount 217,068 209,885
Total, Bank Actual Amount $ 225,414 $ 215,549
Leverage (Tier 1), Bank Actual Ratio 13.20% 13.80%
Common Tier 1, Bank Actual Ratio 16.80% 18.00%
Tier 1, Bank Actual Ratio 16.80% 18.00%
Total, Bank Actual Ratio 17.40% 18.40%
Leverage (Tier 1), For Capital Adequacy Purposes Amount $ 65,825 $ 60,774
Common Tier 1, For Capital Adequacy Purposes Amount 58,154 52,579
Tier 1, For Capital Adequacy Purposes Amount 77,539 70,105
Total, For Capital Adequacy Purposes Amount $ 103,386 $ 93,474
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 Capital Adequacy Purposes Ratio 8.00% 8.00%
Leverage (Tier 1), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 82,282 $ 75,968
Common Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 84,001 75,948
Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 103,386 93,474
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 129,232 $ 116,842
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%