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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amount      
Federal funds purchased, At period-end $ 213,597 $ 381,195  
Securities sold under agreements to repurchase, At period-end 342,820 400,044  
Rate      
Repurchase agreement 342,800 400,000  
Carrying amount of the securities pledged to collateralize repurchase agreements 8,189,780 7,173,947  
Asset Pledged as Collateral [Member]      
Rate      
Carrying amount of the securities pledged to collateralize repurchase agreements $ 443,200 $ 471,300  
Financing Receivable, Pledging Purpose [Extensible Enumeration] Federal funds purchased, At period-end Federal funds purchased, At period-end  
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      
At period-end $ 213,597 $ 381,195 $ 384,735
Average for the year 278,251 482,471 222,742
Maximum month-end balance $ 370,876 $ 508,248 $ 384,735
Rate      
At period-end (as a percent) 4.31% 0.08% 0.00%
Average for the year (as a percent) 1.35% 0.09% 0.17%
Securities sold under agreements to repurchase      
Amount      
Securities sold under agreements to repurchase, At period-end $ 342,820 $ 400,044 $ 394,931
Average for the year 395,141 395,498 330,368
Maximum month-end balance $ 458,580 $ 435,302 $ 396,948
Rate      
At period-end (as a percent) 0.40% 0.16% 0.33%
Average for the year (as a percent) 0.19% 0.20% 0.47%