Parent Company Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash	$ 340,069	$ 532,716	$ 188,291
Total assets	18,776,612	31,597,795
LIABILITIES AND STOCKHOLDERS' EQUITY
Unsecured senior notes	1,776,219	645,820
Accounts payable and accrued expenses	359,413	308,398
Income taxes payable	685,262	622,700
Total liabilities	15,358,287	28,208,407
Total liabilities and stockholders' equity	18,776,612	31,597,795
PennyMac Financial Services, Inc. | Parent Company [Member]
ASSETS
Cash	9,276	19,013
Investment in subsidiaries	4,217,461	3,918,583
Receivable from PennyMac Mortgage Investment Trust	27
Due from subsidiaries	1,477,332	580,069
Total assets	5,704,096	4,517,665
LIABILITIES AND STOCKHOLDERS' EQUITY
Unsecured senior notes	1,776,219	645,820
Accounts payable and accrued expenses	28,135	14,590
Payables to subsidiaries	116	22,405
Income taxes payable	481,301	445,462
Total liabilities	2,285,771	1,128,277
Stockholders' equity	3,418,325	3,389,388
Total liabilities and stockholders' equity	$ 5,704,096	$ 4,517,665