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Bank Premises and Equipment (Premises and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total cost $ 26,051 $ 21,537
Less accumulated depreciation (9,883) (10,463)
Net book value of bank premises and equipment 16,168 11,074
Assets held for sale   1,894
Total bank premises and equipment 16,168 12,968
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 3,564 2,315
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 8,632 9,517
Furniture, Fixtures, and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 8,262 8,184
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 1,126 1,432
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 4,467 $ 89