Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 29, 2017 $ / shares shares	Dec. 31, 2017 USD ($) BranchOffice Segment shares	Dec. 31, 2016 USD ($)
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Shares purchased under employee stock ownership plan		723,751
Common stock, shares, outstanding		18,463,028
Ownership percentage		100.00%
Number of branch offices | BranchOffice		13
Minimum collection percentage of securities required to be considered as a maturity		85.00%
Period of historical loss experience to estimate allowance for loan losses		36 months
Percentage of largest amount of tax benefits likely to realize		50.00%
Liabilities recorded for uncertainty tax position | $		$ 0	$ 0
Number of reportable operating segment | Segment		1
Commercial Real Estate Portfolio Segment
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Period on which interest rate is adjusted		5 years
Minimum
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Percentage of loan to value ratio		65.00%
Minimum | Construction Loans
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Loan term		6 months
Minimum | Commercial Real Estate Portfolio Segment
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Loan amortization period		15 years
Balloon payments period of loan		10 years
Minimum | Commercial Portfolio Segment
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Loan term		5 years
Maximum
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Percentage of loan to value ratio		90.00%
Maximum | Construction Loans
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Loan term		2 years
Maximum | Commercial Real Estate Portfolio Segment
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Percentage of loan to value ratio		75.00%
Loan amortization period		30 years
Balloon payments period of loan		15 years
Maximum | Commercial Portfolio Segment
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Loan term		7 years
Common Stock
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Number of shares sold	8,308,362
Common stock price, per share | $ / shares	$ 10.00
Shares purchased under employee stock ownership plan	723,751
Common stock, shares, outstanding	18,463,028
Stock offering costs | $		$ 4,988
Common Stock | Ponce Bank Mutual Holding Company
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Number of shares sold	9,545,387	9,545,387
Common Stock | Ponce De Leon Foundation
Nature Of Business And Summary Of Significant Accounting Policies Table Of Statement [Line Items]
Number of shares sold	609,279