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Premises and Equipment (Summary of Premises and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 56,897 $ 52,484
Less accumulated depreciation 34,866 30,898
Total 22,031 21,586
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 873 873
Building [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 14,684 13,386
Leaseholds and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 2,537 2,120
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 16,332 14,801
Software [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 5,043 4,819
Internally Developed Software [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 17,428 $ 16,485