["Journal of Money, Credit and Banking, EarlyView. ", "\nAbstract\nI estimate a dynamic banking model to quantify the impact of the Dodd–Frank Act on small banks and bank entry in the United States. The model features a bank portfolio‐choice problem with a risk‐return trade‐off in the loan market. My counterfactual experiments uncover a novel regulatory dis‐synergy: while tighter capital requirements mitigate bank risk, higher compliance costs create a risk‐seeking incentive for banks. The interaction of the two creates a strong destabilizing effect that aggravates bank failures in the short run. Furthermore, I find that increases in regulatory burdens explain about 70% of the collapse of bank entry since 2010."]