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Note 3 - Securities (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Securities, Held-to-maturity, Fair Value, Total $ 119,790      
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 118,662      
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax $ 1,128 $ 1,128
Number of Temporarily Impaired Securities   166    
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value   $ 310,010    
Continuous Unrealized Loss Position Aggregate Losses   $ 2,854    
Number of Temporarily Impaired Securities Greater than Twelve Months   40    
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value   $ 39,553 281,626  
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses   85 7,365  
Debt Securities, Available-for-sale, Restricted   220,299 196,062  
Available-for-sale Securities, Gross Realized Gains   566 17  
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged   533,963    
Restricted Stock [Member]        
Restricted Investments   $ 1,220 1,220  
US Government Agencies Debt Securities [Member]        
Number of Temporarily Impaired Securities   39    
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value   $ 38,962    
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value   38,962 259,992  
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses   $ 37 6,450  
US States and Political Subdivisions Debt Securities [Member]        
Number of Temporarily Impaired Securities   1    
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value   $ 591    
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value   591 20,758  
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses   48 814  
Securities Sold [Member]        
Available-for-sale Securities, Gross Realized Gains   438 16  
Securities Called [Member]        
Available-for-sale Securities, Gross Realized Gains   $ 128 $ 1  
Other Securities [Member]        
Available-for-sale Securities, Gross Realized Gains       4
Available-for-sale Securities Sold, Book Value       $ 189