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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]    
Premises and equipment, gross $ 115,121 $ 99,032
Less: accumulated depreciation 55,057 44,165
Premises and equipment, net 60,064 54,867
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 8,016 8,301
Premises and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 68,346 57,131
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 37,203 30,853
Construction in process    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 1,556 $ 2,747