Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 06, 2020
Document and Entity Information
Entity Registrant Name	PennyMac Financial Services, Inc.
Entity Central Index Key	0001745916
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Entity Interactive Data Current	Yes
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		79,232,448
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1