Note 14 - Concentrations of Credit Risk	12 Months Ended
Dec. 31, 2022
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	*Note 14:* Concentrations of Credit Risk** The Company does a general banking business, serving the commercial and personal banking needs of its customers. NBB’s primary service area is defined as the Virginia counties of Albemarle, Augusta, Bedford, Bland, Botetourt, Buchanan, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Montgomery, Pulaski, Roanoke, Rockbridge, Rockingham, Russell, Tazewell, Smyth, Washington, Wythe, and the cities of Bristol, Buena Vista, Charlottesville, Galax, Harrisonburg, Lexington, Lynchburg, Radford, Roanoke, Salem, Staunton, and Waynesboro. The service area also includes the West Virginia counties of Mercer, Monroe and McDowell and the Tennessee city of Bristol and counties of Sullivan and Washington. Substantially all of NBB’s loans are made in its primary service area. Additionally, the Company occasionally participates in loans in nearby higher growth metropolitan areas. Real estate mortgage loans secured by property outside NBB’s primary service area are not considered an out of market exception when the customer is located within the primary service area. All other loans that are out of the primary service area and do not also have collateral within the primary service area require policy exception approval. The ultimate collectability of NBB’s loan portfolio and the ability to realize the value of any underlying collateral, if needed, is influenced by the economic conditions of the market area. The Company’s operating results are therefore closely correlated with the economic trends within this area. Commercial real estate as of December 31, 2022 and 2021 represented approximately 51% and 50%, respectively, of the loan portfolio, at $437,888 and $405,722, respectively. Included in commercial real estate are loans for college housing and professional office buildings that comprised $196,398 and $201,858 as of December 31, 2022 and 2021, respectively, corresponding to approximately 23% of the loan portfolio as of December 31, 2022 and 25% of the loan portfolio as of December 31, 2021. Loans secured by residential real estate were $221,052, or approximately 26% of the portfolio, and $208,977, or 26% of the portfolio as of December 31, 2022 and 2021, respectively. The Company has established operating policies relating to the credit process and collateral in loan originations. Loans to purchase real and personal property are generally collateralized by the related property and with loan amounts established based on certain percentage limitations of the property’s total stated or appraised value. Credit approval is primarily a function of cash flow, collateral and the evaluation of the creditworthiness of the individual borrower or project based on available financial information. Management considers the concentration of credit risk to be minimal.

Note 14 - Concentrations of Credit Risk

12 Months Ended

Dec. 31, 2022

Concentration Risk Disclosure [Text Block]

Note 14: Concentrations of Credit Risk

The Company does a general banking business, serving the commercial and personal banking needs of its customers. NBB’s primary service area is defined as the Virginia counties of Albemarle, Augusta, Bedford, Bland, Botetourt, Buchanan, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Montgomery, Pulaski, Roanoke, Rockbridge, Rockingham, Russell, Tazewell, Smyth, Washington, Wythe, and the cities of Bristol, Buena Vista, Charlottesville, Galax, Harrisonburg, Lexington, Lynchburg, Radford, Roanoke, Salem, Staunton, and Waynesboro. The service area also includes the West Virginia counties of Mercer, Monroe and McDowell and the Tennessee city of Bristol and counties of Sullivan and Washington. Substantially all of NBB’s loans are made in its primary service area. Additionally, the Company occasionally participates in loans in nearby higher growth metropolitan areas. Real estate mortgage loans secured by property outside NBB’s primary service area are not considered an out of market exception when the customer is located within the primary service area. All other loans that are out of the primary service area and do not also have collateral within the primary service area require policy exception approval. The ultimate collectability of NBB’s loan portfolio and the ability to realize the value of any underlying collateral, if needed, is influenced by the economic conditions of the market area. The Company’s operating results are therefore closely correlated with the economic trends within this area.

Commercial real estate as of December 31, 2022 and 2021 represented approximately 51% and 50%, respectively, of the loan portfolio, at $437,888 and $405,722, respectively. Included in commercial real estate are loans for college housing and professional office buildings that comprised $196,398 and $201,858 as of December 31, 2022 and 2021, respectively, corresponding to approximately 23% of the loan portfolio as of December 31, 2022 and 25% of the loan portfolio as of December 31, 2021. Loans secured by residential real estate were $221,052, or approximately 26% of the portfolio, and $208,977, or 26% of the portfolio as of December 31, 2022 and 2021, respectively.

The Company has established operating policies relating to the credit process and collateral in loan originations. Loans to purchase real and personal property are generally collateralized by the related property and with loan amounts established based on certain percentage limitations of the property’s total stated or appraised value. Credit approval is primarily a function of cash flow, collateral and the evaluation of the creditworthiness of the individual borrower or project based on available financial information. Management considers the concentration of credit risk to be minimal.