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Note 3 - Securities (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of Temporarily Impaired Securities 291  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 318,413  
Continuous Unrealized Loss Position Aggregate Losses $ 7,067  
Number of Temporarily Impaired Securities Greater than Twelve Months 48  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 51,999 $ 4,695
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 2,145 5
Debt Securities, Available-for-sale, Restricted 287,023 251,048
Debt Securities, Available-for-sale, Realized Gain   108
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 603,827  
Restricted Stock [Member]    
Restricted Investments $ 845 1,279
US Government Agencies Debt Securities [Member]    
Number of Temporarily Impaired Securities 28  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 26,792  
Continuous Unrealized Loss Position Aggregate Losses 1,180  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 26,792 0
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 1,180 0
US States and Political Subdivisions Debt Securities [Member]    
Number of Temporarily Impaired Securities 17  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 20,542  
Continuous Unrealized Loss Position Aggregate Losses 793  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 20,542 635
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 793 3
Collateralized Mortgage Backed Securities [Member]    
Number of Temporarily Impaired Securities 3  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 4,665  
Continuous Unrealized Loss Position Aggregate Losses 172  
Securities Called [Member]    
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ 6  
Debt Securities, Available-for-sale, Realized Gain   65
Securities Sold [Member]    
Debt Securities, Available-for-sale, Realized Gain   $ 43