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Business Segment and Revenues Information - Business Segment and Revenues Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information                      
Net income attributable to Piper Sandler Companies $ 113,968 $ 60,266 $ 42,182 $ 64,915 $ 69,059 $ 34,789 $ 34,773 $ 42,493 $ 281,331 $ 181,114 $ 85,491
Total assets 2,592,646       2,255,936       2,592,646 2,255,936  
Total investment banking                 1,400,866 1,105,135 923,812
Total institutional brokerage                 433,198 401,442 377,539
Total revenues from contracts with customers                 1,834,064 1,506,577 1,301,351
Interest income                 36,904 32,908 26,723
Investment income/(loss)                 33,249 (7,890) 30,039
Total revenues 666,992 480,094 398,577 358,554 485,384 360,928 340,844 344,439 1,904,217 1,531,595 1,358,113
Interest expense 942 818 1,799 1,282 1,277 1,356 1,665 1,383 4,841 5,681 10,146
Net revenues $ 666,050 $ 479,276 $ 396,778 $ 357,272 $ 484,107 $ 359,572 $ 339,179 $ 343,056 1,899,376 1,525,914 1,347,967
Advisory services                      
Segment Reporting Information                      
Total investment banking                 1,037,959 808,746 709,316
Corporate financing                      
Segment Reporting Information                      
Total investment banking                 217,156 173,876 131,077
Municipal financing                      
Segment Reporting Information                      
Total investment banking                 145,751 122,513 83,419
Equity brokerage                      
Segment Reporting Information                      
Total institutional brokerage                 230,273 215,275 209,512
Fixed income services                      
Segment Reporting Information                      
Total institutional brokerage                 $ 202,925 $ 186,167 $ 168,027