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Short-term Borrowings (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
item
Short-term borrowings      
Short-term borrowings $ 1,329,948   $ 1,424,010
Hilltop Broker-Dealers      
Short-term borrowings      
Weighted average interest rate (as a percent) 1.05%   2.52%
Federal Funds Purchased.      
Short-term borrowings      
Short-term borrowings $ 199,095   $ 81,625
Securities Sold under Agreements to Repurchase      
Short-term borrowings      
Short-term borrowings 698,433   612,125
FHLB notes      
Short-term borrowings      
Short-term borrowings 150,000   $ 600,000
Average balance during the year $ 153,736 $ 4,167  
Average interest rate during the year 1.63% 2.65%  
Average interest rate at end of year (as a percent) 0.50%   1.56%
FHLB notes | Maximum      
Short-term borrowings      
Maturity term of debt 365 days    
Short Term Bank Loans.      
Short-term borrowings      
Short-term borrowings $ 250,500   $ 111,000
Commercial paper      
Short-term borrowings      
Short-term borrowings $ 31,920   $ 19,260
Number of commercial paper programs initiated | item     2
Weighted average maturity term 35 days    
Weighted average interest rate (as a percent) 1.50%    
Debt instrument, collateral $ 36,300    
Commercial paper | Minimum      
Short-term borrowings      
Maturity term of debt     14 days
Commercial paper | Maximum      
Short-term borrowings      
Maturity term of debt     270 days
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 year $ 732,954 $ 654,117  
Average interest rate during the year 1.78% 2.63%  
Average interest rate at end of year (as a percent) 1.31%   1.97%
Securities underlying the agreements at end of period: Carrying value $ 705,544   $ 612,515
Securities underlying the agreements at end of period: Estimated fair value $ 753,129   $ 661,023