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Premises and Equipment (Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 79,873 $ 76,092
Accumulated depreciation and amortization (37,378) (34,201)
Premises and equipment, net 42,495 41,891
Land and land improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,069 2,985
Buildings and leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 39,594 37,054
Furniture, fixtures and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 37,210 $ 36,053