Don't programs like IBank, the SBA, and municipal bonds already do this?

Answer

Those programs matter, but they work differently. IBank lends once from a fixed pool of state capital. SBA loans still require a private bank willing to originate and hold them. The SBA guarantees the loan, it doesn't replace the private lender's decision. Municipal bonds fund a single project and don't recycle; once spent, that money doesn't come back to lend again. A public bank is different: it holds deposits directly and re-lends that same base of capital again and again, filling gaps for borrowers — like community land trusts, employee-owned businesses, and small and mid-sized local companies — that existing programs often can't reach.