We study the impact of social capital, measured by corporate social responsibility (CSR) performance, on corporate borrowing. Using a sample of 120,204 bank loan applications of China's listed firms, we find that an increase in CSR performance increases the loan amounts of approved loans, although it does not alter the likelihood of loan approval. Using aggregate loans at the firm level, we show that CSR performance positively impacts firms' long-term borrowing from banks but does not affect their short-term borrowing. The economic magnitude of the positive effect is large at both the loan and firm levels. We attribute this positive relationship to reduced information asymmetry and improved risk mitigation. Surprisingly, we find that banks do not discipline their borrowers' CSR investments through the lending relationship. Specifically, when borrowers exhibit high CSR performance and borrow from banks with high CSR performance, further increases in CSR no longer correlate with larger loan amounts. Our findings suggest that China's state-led green credit policies should be more market-oriented.