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Note 3 - Securities (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Temporarily Impaired Securities 62    
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 74,662    
Continuous Unrealized Loss Position Aggregate Losses $ 503    
Number of Temporarily Impaired Securities Greater than Twelve Months 2    
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 4,695 $ 39,553  
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 5 85  
Debt Securities, Available-for-sale, Restricted 251,048 220,999  
Available-for-sale Securities, Gross Realized Gains 108 566 $ 17
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
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]      
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 558,703    
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 $ 635    
Continuous Unrealized Loss Position Aggregate Losses 3    
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 635 591  
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 3 48  
Collateralized Mortgage Backed Securities [Member]      
Number of Temporarily Impaired Securities 1    
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 4,060    
Continuous Unrealized Loss Position Aggregate Losses 2    
Securities Sold [Member]      
Available-for-sale Securities, Gross Realized Gains 43 438 1
Securities Called [Member]      
Available-for-sale Securities, Gross Realized Gains $ 65 $ 128 $ 16