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Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total cost $ 143,168 $ 138,443
Accumulated depreciation (50,752) (46,234)
Net premises and equipment 92,416 92,209
Land    
Property, Plant and Equipment [Line Items]    
Total cost 27,224 27,292
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total cost 86,004 83,669
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total cost $ 29,940 $ 27,482