Parent Company Only Financial Statements - Schedule of Consolidated Statements of Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements Captions [Line Items]
Interest on ESOP loan										$ 175	$ 52
Net interest income	$ 9,607	$ 9,247	$ 9,133	$ 8,677		$ 8,477	$ 8,348	$ 8,083	$ 7,298	36,666	32,206	$ 27,805
Share-based compensation expense										98
Occupancy expense										6,673	5,825	5,651
Professional fees										3,154	1,060	959
Other operating expenses										1,915	1,580	1,007
Income (loss) before income tax (benefit)	1,133	590	865	1,209		(784)	(4,852)	1,765	908	3,798	(2,963)	2,430
Income tax (benefit)	498	188	166	268		2,081	(1,643)	641	345	1,121	1,424	1,005
Net income (loss)	$ 635	$ 402	$ 699	$ 941	$ (2,864)	$ (2,865)	$ (3,209)	$ 1,124	$ 563	2,677	(4,387)	$ 1,425
Ponce Bank Mutual Holding Company
Condensed Financial Statements Captions [Line Items]
Interest on ESOP loan										175	53
Interest on Certificate of Deposit										404
Net interest income										579	53
Share-based compensation expense										98
Management fee expense										411
Occupancy expense										20
Contribution to Ponce De Leon Foundation											6,293
Professional fees										1,823
Other operating expenses										171
Income (loss) before income tax (benefit)										(1,944)	(6,240)
Income tax (benefit)										(221)	(1,287)
Equity in undistributed earnings of Ponce Bank										4,400	566
Net income (loss)										$ 2,677	$ (4,387)