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Securities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Securities          
Realized net gains (losses) from trading securities portfolio $ 2.0 $ 86.2 $ 21.8 $ 106.7  
Realized net gains (losses) from other securities     (0.1) 0.2  
Carrying amount of securities pledged 704.1   704.1   $ 712.3
Fair value of securities pledged 718.3   718.3   $ 733.8
Hilltop Broker-Dealers          
Securities          
Realized net gains (losses) from trading securities portfolio $ 17.0 $ (14.4) $ 52.1 $ 27.8