Regulatory Capital Requirements - Summary of Actual Capital Amounts and Ratios As Compared to Regulatory Requirements (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
PDL Community Bancorp
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk-Weighted Assets, Actual Amount	$ 181,196
Tier 1 Capital to Risk-Weighted Assets, Actual Amount	172,603
Common Equity Tier 1 Capital Ratio, Actual Amount	172,603
Tier 1 Capital to Total Assets, Actual Amount	$ 172,603
Total Capital to Risk-Weighted Assets, Actual Ratio	26.57%
Tier 1 Capital to Risk-Weighted Assets, Actual Ratio	25.31%
Common Equity Tier 1 Capital Ratio, Actual Ratio	25.31%
Tier 1 Capital to Total Assets, Actual Ratio	20.02%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Amount	$ 54,557
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Amount	40,917
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Amount	30,688
Tier 1 Capital to Total Assets, For Capital Adequacy Amount	$ 34,486
Total Capital to Risk-Weighted Assets, For Capital Adequacy Ratio	8.00%
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio	6.00%
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio	4.50%
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio	4.00%
Total Capital to Risk-Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 68,196
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	54,557
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	44,327
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 43,108
Total Capital to Risk-Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%
Ponce Bank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital to Risk-Weighted Assets, Actual Amount	$ 141,120	$ 106,190
Tier 1 Capital to Risk-Weighted Assets, Actual Amount	132,577	99,240
Common Equity Tier 1 Capital Ratio, Actual Amount	132,577	99,240
Tier 1 Capital to Total Assets, Actual Amount	$ 132,577	$ 99,240
Total Capital to Risk-Weighted Assets, Actual Ratio	20.73%	19.21%
Tier 1 Capital to Risk-Weighted Assets, Actual Ratio	19.48%	17.96%
Common Equity Tier 1 Capital Ratio, Actual Ratio	19.48%	17.96%
Tier 1 Capital to Total Assets, Actual Ratio	14.67%	13.32%
Total Capital to Risk-Weighted Assets, For Capital Adequacy Amount	$ 54,447	$ 44,217
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Amount	40,835	33,163
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Amount	30,626	24,872
Tier 1 Capital to Total Assets, For Capital Adequacy Amount	$ 36,152	$ 29,805
Total Capital to Risk-Weighted Assets, For Capital Adequacy Ratio	8.00%	8.00%
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio	6.00%	6.00%
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio	4.50%	4.50%
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio	4.00%	4.00%
Total Capital to Risk-Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 68,059	$ 55,271
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	54,447	44,217
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	44,238	35,926
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 45,190	$ 37,256
Total Capital to Risk-Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 Capital to Risk-Weighted Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Common Equity Tier 1 Capital Ratio, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier 1 Capital to Total Assets, For Capital Adequacy Ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%