Commercial real estate, commercial and industrial and construction, land acquisition and development loans tend to have larger balances than single family mortgage loans and other consumer loans. Because FNCB's loan portfolio contains a significant number of commercial and industrial loans, commercial real estate loans and construction, land acquisition and development loans with relatively large balances, the deterioration of one or a few of these loans may cause a significant increase in non-performing assets. All non-performing loans totaled $5.4 million, or 0.44% of total gross loans and leases, as of December 31, 2023, and $2.8 million, or 0.25%, of total gross loans and leases at December 31, 2022. Specifically, commercial real estate loans that were non-performing totaled $3.1 million, or 0.26%, of total gross loans and leases at December 31, 2023 and $1.5 million, or 0.14%, of total gross loans and leases at December 31, 2022. An increase in non-performing loans could result in a loss of earnings from these loans, an increase in the provision for credit losses, or an increase in loan charge-offs, which could have an adverse impact on FNCB's results of operations and financial condition.
A substantial portion of FNCB's loans are secured by real estate in the Northeastern Pennsylvania market, and substantially all of its loans are to borrowers in that area. FNCB also has a significant amount of commercial real estate, commercial and industrial, construction, land acquisition and development loans and land-related loans for residential and commercial developments. At December 31, 2023, $713.3 million, or 58.5%, were secured by real estate, primarily commercial real estate, in Northeastern Pennsylvania. Management has taken steps to mitigate commercial real estate concentration risk through diversification of the types and characteristics of real estate collateral properties, sound underwriting practices, and ongoing portfolio monitoring and market analysis. Of total outstanding loans and leases, $59.9 million, or 4.9%, were construction, land acquisition and development loans. Based on FNCB's historical records, construction, land acquisition and development loans have had the highest risk of not being collected. An additional $183.8 million, or 15.1%, of portfolio loans were commercial and industrial loans not secured by real estate. Historically, commercial and industrial loans generally have had a higher risk of default than other categories of loans, such as single-family residential mortgage loans. The repayment of these loans often depends on the successful operation of a business and are more likely to be adversely affected by adverse economic conditions. While management believes that the loan portfolio is well diversified in terms of borrowers and industries, these concentrations expose FNCB to the risk that adverse developments in the real estate market, or in the general economic conditions in its market area, could adversely affect the quality and collectability of its loans and could increase the level of non-performing loans. An increase in non-performing loans could result in loss of earnings from these loans and increases in loan charge-offs and the provision for credit losses, all of which could have a material adverse effect on FNCB's financial condition and results of operations. Additionally, if, for any reason, economic conditions in its market area deteriorate, or there is significant volatility or weakness in the economy or any significant sector of the area's economy, FNCB's ability to develop business relationships may be diminished, loan demand may be reduced and collateral values supporting loans may decline, which could also adversely affect FNCB's financial condition and results of operations.
Guidance adopted by federal banking regulators provides that banks having concentrations in construction, land development or commercial real estate loans are expected to have and maintain higher levels of risk management and, potentially, higher levels of capital, which may adversely affect shareholder returns, or require FNCB to obtain additional capital sooner than it otherwise would. Excluded from the scope of this guidance are loans secured by non-farm nonresidential properties where the primary source of repayment is the cash flow from the ongoing operations and activities conducted by the party, or affiliate of the party, who owns the property.
Outstanding loans and line of credit balances to directors, officers and their related parties totaled $79.3 million as of December 31, 2023. At December 31, 2023, there were no loans to directors, officers and their related parties that were categorized as criticized loans within the Bank's risk rating system, meaning they are not considered to present a higher risk of collection than other loans. See Note 12, "Related Party Transactions" of the notes to consolidated financial statements included in Item 8, "Financial Statements and Supplementary Data" and Item 13, "Certain Relationships and Related Transactions, and Director Independence" to this Annual Report on Form 10-K for more information regarding loans to officers and directors and/or their related parties.