In real life, almost every country has a central authority, often called a central bank, that is responsible for overseeing "economic and monetary policies and to ensure the financial system remains stable," according to Investopedia. The United States calls its central banking system the Federal Reserve. Canada's is called the Bank of Canada (which is not to be confused with the Royal Bank of Canada or the National Bank of Canada).
To continue the example in the United States, Bank of America is not a central bank that establishes financial policy. It's a regular bank that has branches, ATMs, and other tools typically associated with a bank where you can hold an account. Even more confusing, there's another such bank in the United States that's actually named Central Bank even though it's not a central bank in the sense of an institution that establishes monetary policy.
What are the names of your respective nations' central banks? Are there certain peculiarities about your NS nation's financial system?
For an example, Sarzonia's central bank's full formal name is The Central Bank of The Incorporated States. The "short formal" name is The Bank of The Incorporated States, but news outlets in Sarzonia refer to it as "the central bank" on second and subsequent references. For example, "The Bank of The Incorporated States announced an interest rate hike of 0.25 percent, increasing to 0.75 percent in an effort to slow a rapid increase in inflation. The central bank made this announcement after its quarterly meeting in Woodstock." Meanwhile, Bank of Sarzonia is merely a branch bank in the same vein that Bank of America is the same sort of bank in real life.