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Note 3 - Securities (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Note 3 - Securities (Details) [Line Items]    
Number of Temporarily Impaired Securities 209  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 192,125  
Continuous Unrealized Loss Position, Aggregate Losses $ 5,814  
Number of Temporarily Impaired Securities, Greater Than Twelve Months 106  
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value $ 95,447 $ 178,042
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses 3,698 5,490
Available-for-sale Securities Pledged as Collateral $ 156,721 157,951
US Government Agencies Debt Securities [Member]    
Note 3 - Securities (Details) [Line Items]    
Number of Temporarily Impaired Securities 178  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 173,214  
Continuous Unrealized Loss Position, Aggregate Losses 5,129  
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 84,959 156,149
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses $ 3,329 4,709
US States and Political Subdivisions Debt Securities [Member]    
Note 3 - Securities (Details) [Line Items]    
Number of Temporarily Impaired Securities 23  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 13,610  
Continuous Unrealized Loss Position, Aggregate Losses 330  
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 10,161 19,818
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses $ 306 692
Corporate Debt Securities [Member]    
Note 3 - Securities (Details) [Line Items]    
Number of Temporarily Impaired Securities 7  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 5,174  
Continuous Unrealized Loss Position, Aggregate Losses 293  
Continuous Unrealized Loss Position, Twelve Months Or Longer, Fair Value 200 1,948
Continuous Unrealized Loss Position, 12 Months Or Longer, Aggregate Losses $ 1 27
Other Securities [Member]    
Note 3 - Securities (Details) [Line Items]    
Number of Temporarily Impaired Securities 1  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 127  
Continuous Unrealized Loss Position, Aggregate Losses 62  
Federal Home Loan Bank of Atlanta [Member] | National Bank of Blacksburg [Member]    
Note 3 - Securities (Details) [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 440,062  
Restricted Stock [Member]    
Note 3 - Securities (Details) [Line Items]    
Restricted Investments $ 1,129 $ 1,089