Parent Company Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flow from operating activities
Net income	$ 311,423	$ 144,656	$ 475,507
Amortization of debt issuance costs	28,812	21,432	19,198
Increase in receivable from PennyMac Mortgage Investment Trust	(4,464)	5,666	2,776
Repricing of payable to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement	(201)		(576)
Payments to exchanged Private National Mortgage Acceptance Company, LLC unitholders under tax receivable agreement			(3,855)
(Decrease) increase in accounts payable and accrued expenses	(78,651)	121,677	(109,485)
Increase in income taxes payable	88,115	40,142	317,482
Net cash used in operating activities	(4,533,270)	(1,582,219)	6,033,235
Cash flow from investing activities
Net cash used in investing activities	(1,887,955)	(273,288)	(721,582)
Cash flow from financing activities
Issuance of unsecured senior notes	650,000	750,000
Payment of debt issuance costs	(35,922)	(33,018)	(19,606)
Issuance of common stock by exercise of stock options	20,062	17,215	2,947
Repurchase of common stock and Class A common stock		(71,491)	(406,086)
Payment of withholding taxes relating to stock-based compensation	(9,401)	(9,142)	(7,780)
Net cash provided by (used in) financing activities	5,721,336	1,465,339	(4,323,207)
Net decrease in cash and restricted cash	(699,889)	(390,168)	988,446
Non-cash financing activity:
Restricted Cash			3
PennyMac Financial Services, Inc.
Non-cash financing activity:
Repurchase of common stock paid by PNMAC on behalf of Parent company		71,491
Payment of withholdings taxes relating to stock-based compensation by PNMAC on behalf of Parent company	9,401	9,142
Issuance of common stock in settlement of directors' fees	256	180	205
PennyMac Financial Services, Inc. | Parent Company
Cash flow from operating activities
Net income	311,423	144,656	475,507
Equity in undistributed earnings of subsidiaries	(300,307)	(38,551)	(161,893)
Amortization of debt issuance costs	6,509	3,802	3,701
Increase in receivable from PennyMac Mortgage Investment Trust		27
(Increase) decrease in intercompany receivable	(698,869)	(894,204)	(31,566)
(Decrease) increase in accounts payable and accrued expenses	4,638	3,280	(1,779)
Increase in payable to subsidiaries	(187)	52	19
Increase in income taxes payable	65,374	32,383	217,771
Net cash used in operating activities	(611,419)	(748,555)	501,760
Cash flow from financing activities
Issuance of unsecured senior notes	650,000	750,000
Payment of debt issuance costs	(12,128)	(14,071)
Payment of dividend to common stock and Class A common stockholders	(52,160)	(41,446)	(54,621)
Issuance of common stock by exercise of stock options	20,062	17,215	2,947
Repurchase of common stock and Class A common stock			(406,086)
Payment of withholding taxes relating to stock-based compensation			(7,780)
Net cash provided by (used in) financing activities	605,774	711,698	(465,540)
Net decrease in cash and restricted cash	(5,645)	(36,857)	36,220
Cash at beginning of year	8,639	45,496	9,276
Cash at end of year	2,994	8,639	45,496
Non-cash financing activity:
Restricted Cash	$ 0	$ 0	$ 0