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Note 14 - Concentrations of Credit Risk | 12 Months Ended
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Dec. 31, 2025
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, as well as the counties of Surry and Allegheny in North Carolina. 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. Loans secured by residential real estate were $328,653, or approximately 33% of the portfolio, and $307,855, or 31% of the portfolio as of December 31, 2025 and 2024, respectively. Commercial real estate as of December 31, 2025 and 2024 represented approximately 47% and 48%, respectively, of the loan portfolio, at $467,783 and $478,078, respectively. Included in commercial real estate are loans for college housing and professional office buildings that comprised $168,609 and $191,026 as of December 31, 2025 and 2024, respectively, corresponding to approximately 17% of the loan portfolio as of December 31, 2025 and 19% of the loan portfolio as of December 31, 2024. Professional office buildings house a variety of businesses, including medical, dental, engineering, attorneys, and higher education. Many of the properties are mixed-use and include residential and retail space along with professional businesses. 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.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482836/275-10-55-3A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-2A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/275/tableOfContent + Details
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