utilize these alternative sources of funding. Under such circumstances, depending on the external source of funds, our interest cost would vary based on the range of interest rates we are charged. This could increase our cost of funds, impacting net interest margins and net interest spreads.
Deposit and Loan Concentrations
We have no material concentration of deposits from any single customer or group of customers. We have no significant portion of our loans concentrated within a single industry or group of related industries. Furthermore, we attempt to avoid making loans that, in an aggregate amount, exceed 10% of total loans to a multiple number of borrowers engaged in similar business activities. As of June 30, 2019, there were no aggregated loan concentrations of this type. We do not believe there are any material seasonal factors that would have a material adverse effect on us. We do not have foreign loans or deposits.
Concentration of Credit Risk
We consider concentrations of credit to exist when, pursuant to regulatory guidelines, the amounts loaned to a multiple number of borrowers engaged in similar business activities which would cause them to be similarly impacted by general economic conditions represents 25 percent of total risk-based capital, or $373.5 million at June 30, 2019. Based on these criteria, we had three such credit concentrations at June 30, 2019, including loans on hotels and motels of $554.3 million, loans to lessors of nonresidential buildings (except mini-warehouses) of $1.3 billion and loans to lessors of residential buildings (investment properties and multi-family) of $586.5 million. The risk for these loans and for all loans is managed collectively through the use of credit underwriting practices developed and updated over time. The loss estimate for these loans is determined using our standard ALLL methodology.
Banking regulators have established guidelines for the construction, land development and other land loans to total less than 100% of total risk-based capital and for total commercial real estate loans to total less than 300% of total risk-based capital. Both ratios are calculated by dividing certain types of loan balances for each of the two categories by the Bank’s total risk-based capital. At June 30, 2019 , December 31, 2018, and June 30, 2018 the Bank’s construction, land development and other land loans as a percentage of total risk-based capital were 64.7%, 69.5%, and 83.3%, respectively. Commercial real estate loans (which includes construction, land development and other land loans along with other non-owner occupied commercial real estate and multifamily loans) as a percentage of total risk-based capital were 227.4%, 216.0% and 218.5% as of June 30, 2019, December 31, 2018 and June 30, 2018, respectively. As of June 30, 2019, December 31, 2018 and June 30, 2018, the Bank was below the established regulatory guidelines. When a bank’s ratios are in excess of one or both of these commercial real estate loan ratio guidelines, banking regulators generally require an increased level of monitoring in these lending areas by bank management. Therefore, we monitor these two ratios as part of our concentration management processes.
Cautionary Note Regarding Any Forward-Looking Statements
Statements included in this report, which are not historical in nature are intended to be, and are hereby identified as, forward-looking statements for purposes of the safe harbor provided by Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward looking statements are based on, among other things, management’s beliefs, assumptions, current expectations, estimates and projections about the financial services industry, the economy and South State. Words and phrases such as “may,” “approximately,” “continue,” “should,” “expects,” “projects,” “anticipates,” “is likely,” “look ahead,” “look forward,” “believes,” “will,” “intends,” “estimates,” “strategy,” “plan,” “could,” “potential,” “possible” and variations of such words and similar expressions are intended to identify such forward-looking statements. We caution readers that forward looking statements are subject to certain risks, uncertainties and assumptions that are difficult to predict with regard to, among other things, timing, extent, likelihood and degree of occurrence, which could cause actual results to differ materially from anticipated results. Such risks, uncertainties and assumptions, include, among others, the matters described in Item 1A. Risk Factors of our Annual Report on Form 10-K for the year ended December 31, 2018, and the following:
| ● | Economic downturn risk, potentially resulting in deterioration in the credit markets, greater than expected noninterest expenses, excessive loan losses and other negative consequences, which risks could be exacerbated by potential negative economic developments resulting from federal spending cuts and/or one or more federal budget-related impasses or actions; |
| ● | Increased expenses, loss of revenues, and increased regulatory scrutiny associated with our total assets having |