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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 41,092 $ 39,416
Less accumulated depreciation 18,590 17,214
Premises and equipment, net 22,502 22,202
Land    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 4,639 4,742
Land improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 1,052 1,041
Buildings    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 22,254 21,601
Equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 13,147 $ 12,032