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Premises and Equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Premises and Equipment      
Premises and equipment, gross $ 232,079 $ 225,138  
Accumulated depreciation 95,932 89,947  
Premises and equipment, net 136,147 135,191  
Depreciation expense 11,610 12,273 $ 11,879
Land and improvements      
Premises and Equipment      
Premises and equipment, gross 45,595 40,762  
Buildings and improvements      
Premises and Equipment      
Premises and equipment, gross 132,011 130,610  
Furniture and equipment      
Premises and Equipment      
Premises and equipment, gross $ 54,473 $ 53,766