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Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Rate      
Repurchase agreement $ 394,900 $ 242,200  
Carrying amount of the securities pledged to collateralize repurchase agreements 515,900 242,200  
Federal funds purchased and securities sold under repurchase agreements      
Amount      
At period-end 779,666 298,741 $ 270,649
Average for the year 553,110 282,172 312,768
Maximum month-end balance $ 779,666 $ 321,833 $ 362,047
Rate      
At period-end (as a percent) 0.17% 0.90% 1.08%
Average for the year (as a percent) 0.35% 0.93% 0.75%
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