Parent Company Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flow from operating activities
Net income	$ 475,507	$ 1,003,490	$ 1,646,884
Amortization of debt issuance costs	19,198	24,321	19,048
Increase in receivable from PennyMac Mortgage Investment Trust	2,776	35,243	(48,320)
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(576)		(280)
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(3,855)	(4,635)	(10,713)
(Decrease) increase in accounts payable and accrued expenses	(109,485)	34,666	135,314
Increase in income taxes payable	317,482	62,562	118,131
Net cash provided by (used in) operating activities	6,033,235	2,563,061	(6,198,938)
Cash flow from investing activities
Net cash (used in) provided by investing activities	(721,582)	(304,369)	783,034
Cash flow from financing activities
Issuance of unsecured senior notes		1,150,000	650,000
Payment of debt issuance costs	(19,606)	(37,567)	(30,112)
Issuance of common stock pursuant to exercise of stock options	2,947	7,536	9,389
Repurchase of common stock and Class A common stock	(406,086)	(958,194)	(337,479)
Payment of withholding taxes relating to stock-based compensation	(7,780)	(8,993)	(5,265)
Net cash (used in) provided by financing activities	(4,323,207)	(2,451,380)	5,760,107
Net increase (decrease) in cash and restricted cash	988,446	(192,688)	344,203
Non-cash financing activity:
Restricted Cash	3	24	65
PennyMac Financial Services, Inc.
Non-cash financing activity:
Issuance of common stock in settlement of directors' fees	205	200	194
PennyMac Financial Services, Inc. | Parent Company [Member]
Cash flow from operating activities
Net income	475,507	1,003,490	1,646,884
Equity in undistributed earnings of subsidiaries	(161,893)	(261,084)	(1,435,328)
Amortization of debt issuance costs	3,701	2,321	225
Increase in receivable from PennyMac Mortgage Investment Trust		(27)
(Increase) decrease in intercompany receivable	(31,566)	(897,063)	(574,518)
(Decrease) increase in accounts payable and accrued expenses	(1,779)	13,545	14,590
Increase in payable to subsidiaries	19	(22,289)	18,211
Increase in income taxes payable	217,771	35,839	65,406
Net cash provided by (used in) operating activities	501,760	(125,268)	(264,530)
Cash flow from financing activities
Issuance of unsecured senior notes		1,150,000	650,000
Payment of debt issuance costs		(21,922)	(4,405)
Payment of dividend to common stock and Class A common stockholders	(54,621)	(52,896)	(30,947)
Issuance of common stock pursuant to exercise of stock options	2,947	7,536	9,389
Repurchase of common stock and Class A common stock	(406,086)	(958,194)	(337,479)
Payment of withholding taxes relating to stock-based compensation	(7,780)	(8,993)	(5,265)
Net cash (used in) provided by financing activities	(465,540)	115,531	281,293
Net increase (decrease) in cash and restricted cash	36,220	(9,737)	16,763
Cash at beginning of year	9,276	19,013	2,250
Cash at end of year	45,496	9,276	19,013
Non-cash financing activity:
Restricted Cash	$ 0	$ 0	$ 0