Exploiting staggered interstate banking deregulation as exogenous shocks to bank geographic expansion, we examine the causal effect of geographic diversification on systemic risk. Using the gravity-deregulation approach, we find that bank geographic diversification leads to higher systemic risk measured by the change in conditional value at risk (ΔCoVaR) and financial integration (Logistic(R^2)). Furthermore, we document that geographic diversification affects systemic risk via its impact on asset similarity. The impact of geographic diversification on systemic risk is stronger in BHCs located in states comoving less with the U.S. aggregate economy.

By integrating staggered interstate banking deregulation into a gravity model following Goetz, Laeven, and Levine (2013), (2016), we construct a time-varying, bank-specific instrument for geographic diversification and investigate its causal effect on corporate innovation via the lending channel. We find that bank geographic diversification spurs corporate innovation and enhances the economic value of innovation. We identify relaxing debt covenants and alleviating borrowers’ financial constraints as the two underlying mechanisms explaining the documented effects. Moreover, by offering lenient covenants, geographically diversified banks provide greater financial and operational flexibility to borrowing firms, enabling them to engage in future mergers and acquisitions.