Summary of Significant Accounting and Reporting Policies - Prior period impacts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Noninterest income:
Securities commissions and fees	$ 125,655	$ 100,532	$ 115,181
Other	$ 189,262	177,425	137,898
Other noninterest income:
Net gains from Hilltop Broker-Dealer structured product and derivative activities		$ 44,128	$ 41,318
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other	Other
Net gain from trading securities portfolio		$ 74,249	$ 43,696
As previously reported
Noninterest income:
Securities commissions and fees		121,875	139,122
Other		156,082	113,957
Other noninterest income:
Net gains from Hilltop Broker-Dealer structured product and derivative activities		42,284	37,407
Net gain from trading securities portfolio		54,750	23,666
Impact of Revision
Noninterest income:
Securities commissions and fees		(21,343)	(23,941)
Other		21,343	23,941
Other noninterest income:
Net gains from Hilltop Broker-Dealer structured product and derivative activities		1,844	3,911
Net gain from trading securities portfolio		$ 19,499	$ 20,030