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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Rate      
Repurchase agreement $ 400,000 $ 394,900  
Carrying amount of the securities pledged to collateralize repurchase agreements 471,300 515,900  
Federal funds purchased and securities sold under repurchase agreements      
Amount      
At period-end 781,239 779,666 $ 298,741
Average for the year 877,969 553,110 282,172
Maximum month-end balance $ 898,663 $ 779,666 $ 321,833
Rate      
At period-end (as a percent) 0.12% 0.17% 0.90%
Average for the year (as a percent) 0.14% 0.35% 0.93%
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