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Note 4 - Securities (Details Textual)
$ in Thousands
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Temporarily Impaired Securities 49  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 106,975  
Continuous Unrealized Loss Position Aggregate Losses $ 852  
Number of Temporarily Impaired Securities Greater than Twelve Months 1  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 622 $ 39,553
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 17 85
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 547,272  
Restricted Stock [Member]    
Restricted Investments $ 1,279 1,220
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 $ 622  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 622 591
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 17 $ 48