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Note 12 - Minimum Regulatory Capital Requirement (Details) - Minimum Capital Requirements - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
NBI Consolidated [Member]    
Total capital (to risk weighted assets)    
Total capital (to risk weighted assets), actual, amount $ 184,054 $ 172,976
Total capital (to risk weighted assets), actual, ratio 25.50% 24.90%
Total capital (to risk weighted assets), minimum capital requirement, amount $ 57,681 $ 55,615
Total capital (to risk weighted assets), minimum capital requirement, ratio 8.00% 8.00%
Total capital (to risk weighted assets), minimum to be well capitalized, amount
Total capital (to risk weighted assets), minimum to be well capitalized, ratio
Tier 1 capital (to risk weighted assets)    
Tier 1 capital (to risk weighted assets), actual, amount $ 175,757 $ 164,713
Tier 1 capital (to risk weighted assets), actual, ratio 24.40% 23.70%
Tier 1 capital (to risk weighted assets), minimum capital requirement, amount $ 43,261 $ 27,807
Tier 1 capital (to risk weighted assets), minimum capital requirement, ratio 6.00% 4.00%
Tier 1 capital (to risk weighted assets), minimum to be well capitalized, amount
Tier 1 capital (to risk weighted assets), minimum to be well capitalized, ratio
Common Equity Tier 1 capital (to risk weighted assets)    
Common equity tier 1 capital (to risk weighted assets), actual, amount $ 175,757  
Common equity tier 1 capital (to risk weighted assets), actual, ratio 24.40%  
Common equity tier 1 capital (to risk weighted assets), minimum capital requirement, amount $ 32,446  
Common equity tier 1 capital (to risk weighted assets), minimum capital requirement, ratio 4.50%  
Common equity tier 1 capital (to risk weighted assets), minimum to be well capitalized, amount  
Common equity tier 1 capital (to risk weighted assets), minimum to be well capitalized, ratio  
Tier 1 capital (to average assets)    
Tier 1 capital (to average assets), actual, amount $ 175,757 $ 164,713
Tier 1 capital (to average assets), actual, ratio 15.10% 14.60%
Tier 1 capital (to average assets), minimum capital requirement, amount $ 46,594 $ 45,122
Tier 1 capital (to average assets), minimum capital requirement, ratio 4.00% 4.00%
Tier 1 capital (to average assets), minimum to be well capitalized, amount
Tier 1 capital (to average assets), minimum to be well capitalized, ratio
National Bank of Blacksburg [Member]    
Total capital (to risk weighted assets)    
Total capital (to risk weighted assets), actual, amount $ 181,926 $ 170,665
Total capital (to risk weighted assets), actual, ratio 25.30% 24.60%
Total capital (to risk weighted assets), minimum capital requirement, amount $ 57,526 $ 55,438
Total capital (to risk weighted assets), minimum capital requirement, ratio 8.00% 8.00%
Total capital (to risk weighted assets), minimum to be well capitalized, amount $ 71,908 $ 69,298
Total capital (to risk weighted assets), minimum to be well capitalized, ratio 10.00% 10.00%
Tier 1 capital (to risk weighted assets)    
Tier 1 capital (to risk weighted assets), actual, amount $ 173,629 $ 162,402
Tier 1 capital (to risk weighted assets), actual, ratio 24.10% 23.40%
Tier 1 capital (to risk weighted assets), minimum capital requirement, amount $ 43,145 $ 27,719
Tier 1 capital (to risk weighted assets), minimum capital requirement, ratio 6.00% 4.00%
Tier 1 capital (to risk weighted assets), minimum to be well capitalized, amount $ 57,526 $ 41,579
Tier 1 capital (to risk weighted assets), minimum to be well capitalized, ratio 8.00% 6.00%
Common Equity Tier 1 capital (to risk weighted assets)    
Common equity tier 1 capital (to risk weighted assets), actual, amount $ 173,629  
Common equity tier 1 capital (to risk weighted assets), actual, ratio 24.10%  
Common equity tier 1 capital (to risk weighted assets), minimum capital requirement, amount $ 32,358  
Common equity tier 1 capital (to risk weighted assets), minimum capital requirement, ratio 4.50%  
Common equity tier 1 capital (to risk weighted assets), minimum to be well capitalized, amount $ 46,740  
Common equity tier 1 capital (to risk weighted assets), minimum to be well capitalized, ratio 6.50%  
Tier 1 capital (to average assets)    
Tier 1 capital (to average assets), actual, amount $ 173,629 $ 162,402
Tier 1 capital (to average assets), actual, ratio 14.90% 14.40%
Tier 1 capital (to average assets), minimum capital requirement, amount $ 46,648 $ 45,074
Tier 1 capital (to average assets), minimum capital requirement, ratio 4.00% 4.00%
Tier 1 capital (to average assets), minimum to be well capitalized, amount $ 58,310 $ 56,342
Tier 1 capital (to average assets), minimum to be well capitalized, ratio 5.00% 5.00%