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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]
$ in Thousands
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Leverage (Tier 1), Bank Actual Amount $ 246,410 $ 233,944
Common Tier 1, Bank Actual Amount 246,410 233,944
Tier 1, Bank Actual Amount 246,410 233,944
Total, Bank Actual Amount $ 255,121 $ 241,825
Leverage (Tier 1), Bank Actual Ratio 12.9 12.5
Common Tier 1, Bank Actual Ratio 17.2 17.9
Tier 1, Bank Actual Ratio 17.2 17.9
Total, Bank Actual Ratio 17.8 18.5
Leverage (Tier 1), For Capital Adequacy Purposes Amount $ 76,672 $ 74,988
Common Tier 1, For Capital Adequacy Purposes Amount 64,384 58,713
Tier 1, For Capital Adequacy Purposes Amount 85,845 78,283
Total, For Capital Adequacy Purposes Amount $ 114,460 $ 104,378
Leverage (Tier 1), For Capital Adequacy Purposes Ratio 4.0 4.0
Common Tier 1, For Capital Adequacy Purposes Ratio 4.50% 4.50%
Tier 1, For Capital Adequacy Purposes Ratio 6.0 6.0
Total, For Capital Adequacy Purposes Ratio 8.0 8.0
Leverage (Tier 1), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 95,840 $ 93,735
Common Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 92,999 84,807
Tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 114,460 104,378
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 143,075 $ 130,472
Leverage (Tier 1), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.0 5.0
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 8.0 8.0
Total, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.0 10.0