The governing legislators or lawmakers—whether at the state or municipal level—would make general policy decisions about public banks (and would likely have an advisory commission to consult), but day-to-day decisions would be made by the banks themselves—governed by their charters and subject to transparency and administrative review. The Bank of North Dakota shows that a public bank can and must be run free of influence from the legislature and other high offices, in order to effectively do its job.
The Bank of North Dakota is the State of North Dakota doing business as the Bank of North Dakota. As Banking on Colorado points out, “A three-member State Industrial Commission oversees Bank of North Dakota, composed of the Governor, the Attorney General, and the Commissioner of Agriculture. The Bank has a seven-member Advisory Board appointed by the governor. The members must be knowledgeable in banking and finance. The Advisory Board reviews the Bank’s operations and makes recommendations to the Industrial Commission relating to the Bank’s management, services, policies and procedures.”
There is every reason to believe public banks will be fiscally conservative, balancing their chartered mandate to lend in the public interest with moderation and careful considerations of risk--moreso than big private banks who gamble with municipal money. Standard & Poor has consistently rated BND in the “A” range, indicating the highest levels of confidence in BND’s creditworthiness and practices. According to North Dakota Attorney General Wayne Stenehjem, “The  S&P review of the bank confirmed that it is well-managed and supports the economic needs of North Dakota . . . The report recognized BND for its conservative management strategy.”