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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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Short-term Borrowings (Details) $ in Thousands	12 Months Ended
Short-term Borrowings (Details) $ in Thousands	Dec. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Short-term borrowings
Short-term borrowings	$ 834,023	$ 900,038
Federal funds purchased
Short-term borrowings
Short-term borrowings	407,058	459,658
Securities sold under agreements to repurchase
Short-term borrowings
Short-term borrowings	$ 198,418	240,050
Federal Home Loan Bank
Short-term borrowings
Average balance during the period		$ 135,274
Average interest rate during the period	5.62%	5.10%
Maximum month-end balance during the year		$ 500,000
Amount of available collateral	$ 4,300,000
Federal Home Loan Bank \| Maximum
Short-term borrowings
Maturity term of debt	365 days
Short-term bank loans
Short-term borrowings
Short-term borrowings	$ 0
Commercial Paper
Short-term borrowings
Short-term borrowings	$ 228,547	200,330
Number of commercial paper programs initiated \| item	2
Weighted average interest rate on short-term bank loan borrowings (as a percent)	5.29%
Weighted average remaining life	59 days
Debt instrument, collateral	$ 251,200
Commercial Paper \| Minimum
Short-term borrowings
Maturity term of debt	14 days
Commercial Paper \| Maximum
Short-term borrowings
Maturity term of debt	270 days
Commercial Paper \| Weighted Average
Short-term borrowings
Maturity term of debt	143 days
Series 2019-1 and Series 2024-1 CP Notes
Short-term borrowings
Maximum borrowing capacity	$ 300,000
Series 2019-1 CP Notes
Short-term borrowings
Maximum borrowing capacity	300,000
Series 2019-2 CP Notes
Short-term borrowings
Maximum borrowing capacity	200,000
Federal funds purchased and securities sold under agreements to repurchase
Short-term borrowings
Average balance during the period	$ 733,799	$ 804,515	$ 573,183
Average interest rate during the period	5.36%	5.53%	2.19%
Maximum month-end balance during the year	$ 798,149	$ 1,341,502	$ 741,499
Average interest rate at end of period (as a percent)	5.06%	5.60%
Securities underlying the agreements at end of period: Carrying value	$ 198,174	$ 239,103
Securities underlying the agreements at end of period: Estimated fair value	$ 214,538	$ 262,408
Federal funds purchased and securities sold under agreements to repurchase \| Minimum
Short-term borrowings
Maturity term of debt	1 day
Federal funds purchased and securities sold under agreements to repurchase \| Maximum
Short-term borrowings
Maturity term of debt	90 days
Line of Credit \| Hilltop Securities \| Credit Arrangements
Short-term borrowings
Number of unaffiliated banks \| item	2
Maximum borrowing capacity	$ 425,000
Line of Credit \| Hilltop Securities \| Revolving Credit Facilities
Short-term borrowings
Number of unaffiliated banks \| item	2
Maximum borrowing capacity	$ 200,000