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Short-term Borrowings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2025
USD ($)
item
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Short-term borrowings      
Short-term borrowings $ 705,008   $ 834,023
Federal funds purchased      
Short-term borrowings      
Short-term borrowings 289,828   407,058
Securities sold under agreements to repurchase      
Short-term borrowings      
Short-term borrowings $ 175,159   198,418
Federal Home Loan Bank      
Short-term borrowings      
Average interest rate during the period 4.65% 5.71%  
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 $ 240,021   $ 228,547
Number of commercial paper programs initiated | item 2    
Weighted average interest rate on short-term bank loan borrowings (as a percent) 5.02%    
Weighted average remaining life 65 days    
Debt instrument, collateral $ 264,200    
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      
Weighted average maturity term 129 days    
Series 2019-1 and Series 2024-1 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 $ 560,581 $ 770,705  
Average interest rate during the period 4.45% 5.50%  
Average interest rate at end of period (as a percent) 4.52%   5.06%
Securities underlying the agreements at end of period: Carrying value $ 174,508   $ 198,174
Securities underlying the agreements at end of period: Estimated fair value $ 191,323   $ 214,538
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 $ 125,000