We construct a dynamic neoclassical model of banking capital where the dynamics are governed by the process of financial capital accumulation and credit risk realizations in a structure where stylized banking characteristics are maintained. This is aimed at focusing on how the profit‐maximizing capital ratio of banks evolves and how it reacts to exogenous shocks particularly so during periods of prolonged downturn of the economy. We examine impulse responses of our model to credit risk shock, business cycle shock, and monetary policy shock. The convergence of financial capital to its optimal level is also explored.