Wall Street's largest banks have offered a reassuring assessment of the health of the US consumer, pointing to resilient spending, rising loan balances and stable credit quality even as elevated borrowing costs and geopolitical tensions cloud the broader economic outlook, according to Reuters.Executives from major U.S. lenders said household finances remain supported by a solid labor market and wage growth, helping consumers continue spending despite persistent inflation and uncertainty surrounding the economic impact of the U.S.-Iran conflict.The upbeat commentary comes as investors remain concerned that higher oil prices triggered by the conflict could fuel inflation, keep interest rates elevated for longer and eventually squeeze household budgets by increasing the cost of essential goods.Recent inflation data has reinforced those concerns. The U.S. Consumer Price Index rose 3.5% in the 12 months through June after climbing 4.2% in May, according to the Labor Department's Bureau of Labor Statistics, although banks indicated that consumer behavior has remained resilient so far.Credit card lending remains a bright spotReuters reported that consumer loan growth across JPMorgan Chase, Bank of America and Wells Fargo was mixed, but all three lenders posted higher credit card balances, highlighting continued consumer spending.JPMorgan reported a 7.3% year-over-year increase in period-end credit card loans to $249.9 billion, while consumer balances excluding credit cards edged 1% lower.Bank of America posted a 3.2% rise in overall consumer loans, with credit card balances increasing 4.4%. Residential mortgage and home equity balances also registered modest gains, suggesting consumers continue to make long-term financial commitments.Wells Fargo reported a 5.4% increase in total consumer loan balances, driven by a sharp rise in auto lending. Credit card balances climbed nearly 5.6%, while residential mortgage balances declined modestly.According to Reuters, analysts said continued home purchases and borrowing indicate confidence in future income prospects, while overall loan growth reflects a consumer sector that remains fundamentally healthy.Credit quality remains stableAnother encouraging trend for lenders has been the stability in consumer credit quality.Reuters reported that JPMorgan said spending remained robust across income groups while delinquency rates came in below expectations. Wells Fargo also highlighted better-than-anticipated delinquency trends, suggesting borrowers are continuing to manage their debt despite higher interest rates.Although rising credit card balances can sometimes signal financial stress, they also generate significant interest income and fee revenue for banks, making credit cards one of the industry's most profitable businesses.Banks have largely attributed the resilience to healthy employment levels and relatively strong household balance sheets.While U.S. job growth slowed sharply in June, employment gains during the second quarter remained significantly stronger than the same period a year earlier, providing continued support for consumer spending.Geopolitical risks remain a concernDespite the positive outlook, banks acknowledged that risks remain.Extended U.S.-Iran conflict could push energy prices higher, potentially reigniting inflationary pressures and reducing consumers' discretionary spending power. Such a scenario could eventually weaken loan demand and lead to higher credit losses if household finances come under sustained pressure.For now, however, large U.S. lenders say the consumer remains a source of strength for the economy.Impact on bank stocksThe reassuring comments on consumer health are broadly positive for major U.S. bank stocks, as resilient spending and stable credit quality support earnings visibility.JPMorgan Chase could benefit from continued strength in its high-margin credit card business and lower-than-expected delinquencies.Bank of America stands to gain from steady consumer loan growth, improving card balances and resilient mortgage demand.Wells Fargo may see investor confidence improve as strong auto lending and stable credit performance reinforce its retail banking outlook.The positive consumer trends could also support sentiment across other consumer-focused lenders and credit card issuers, including American Express, Capital One and Discover Financial Services, as healthy repayment behavior reduces concerns over credit losses.Overall, the latest earnings updates suggest the U.S. consumer continues to underpin economic growth, providing a supportive backdrop for the banking sector even as inflation and geopolitical uncertainties remain key risks.