In 1910, Texas instituted a unique deposit insurance program for its state chartered banks by providing a choice between two separate plans: the depositors guaranty fund, similar to insurance schemes in several other states, and the depositors bond security system, which required the procurement of a privately issued guarantee of indemnity. While, under most deposit insurance schemes, the incentive to monitor the financial condition of individual banks simply devolves from depositors to regulators, the bond security system established in Texas distinguished itself by attempting to reintroduce market discipline through the indemnity requirement. Using a probit model with heteroscedasticity, we find evidence that the choice of insurance coverage led to risk-sorting among the banks, with relatively conservative and financially secure institutions opting for the comparatively rigorous bond security system. In addition, the bank failure record indicates the risk differentials between banks in the two plans persisted over time and even possibly grew, suggesting the bond security system at least partially avoided the moral hazard incentives associated with the fixed-rate depositors guaranty plan. These findings support the general view that market discipline is effective in banking.