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Other Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Reverse repurchase agreements $ 5,000  
FHLBA additional credit 29,132  
Borrowed amount from FHLBA 43,600  
Unsecured Federal Funds Outstanding Amount 0 $ 0
Community Bankers Bank [Member]    
Short-term Debt [Line Items]    
Unsecured federal fund lines 13,000  
Available credit 3,151  
Zions Bank [Member]    
Short-term Debt [Line Items]    
Unsecured federal fund lines 4,000  
PNC Bank [Member]    
Short-term Debt [Line Items]    
Unsecured federal fund lines 6,000  
Suntrust Bank [Member]    
Short-term Debt [Line Items]    
Unsecured federal fund lines 3,000  
FHLBA [Member]    
Short-term Debt [Line Items]    
Available credit $ 156,641  
Maximum [Member]    
Short-term Debt [Line Items]    
Period allowed to exchange securities pledged as collateral for funds 90 days  
Minimum [Member]    
Short-term Debt [Line Items]    
Period allowed to exchange securities pledged as collateral for funds 30 days