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Premises And Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 177,583 $ 172,982  
Less: accumulated depreciation (100,658) (96,017)  
Property, Plant and Equipment, Net, Total 76,925 76,965  
Depreciation 5,790 5,003 $ 5,087
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 34,185 34,185  
Buildings and improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 97,091 95,662  
Buildings and improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 30 years    
Buildings and improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 10 years    
Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 46,307 $ 43,135  
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 7 years    
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated Useful Life 3 years