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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Amount    
Securities sold under agreements to repurchase, At period-end $ 254,721 $ 241,023
Rate    
Repurchase agreement 254,700 241,000
Carrying amount of the securities pledged to collateralize repurchase agreements 6,798,876 7,463,871
Asset Pledged as Collateral    
Rate    
Carrying amount of the securities pledged to collateralize repurchase agreements $ 370,400 $ 410,400
Financing Receivable, Pledging Purpose [Extensible Enumeration] Federal Funds Purchased Federal Funds Purchased
Federal funds purchased and securities sold under repurchase agreements | Minimum    
Information concerning federal funds purchased and securities sold under repurchase agreements    
Maturity period from the transaction date 1 day  
Federal funds purchased and securities sold under repurchase agreements | Maximum    
Information concerning federal funds purchased and securities sold under repurchase agreements    
Maturity period from the transaction date 3 days  
Maturity period as per policies 9 months  
Federal funds purchased    
Amount    
Federal funds purchased, At period-end $ 260,191 $ 248,162
Average for the year 281,031 225,642
Maximum month-end balance $ 340,276 $ 268,346
Rate    
At period-end (as a percent) 4.32% 5.32%
Average for the year (as a percent) 5.21% 5.08%
Securities sold under agreements to repurchase    
Amount    
Securities sold under agreements to repurchase, At period-end $ 254,721 $ 241,022
Average for the year 267,713 317,879
Maximum month-end balance $ 289,795 $ 386,627
Rate    
At period-end (as a percent) 2.11% 2.10%
Average for the year (as a percent) 2.10% 1.30%