The populism of the idea is clear, 'boo, big multinational corporate banks!,' but is it a good idea?
Well, it is hard to say. It seems to rest on the premise that worthy in-state ventures cannot get access to capital. This is not hard to believe is true to some extent at the moment, but putting aside a once-in-a-lifetime credit market collapse, is this an accurate premise in general? I am not convinced.
Which then would imply that the bank would end up being a lender that would undercut competitors essentially subsidizing Oregon businesses or lend to more risky ventures that might have a hard time accessing capital due to the risk factor (essentially a subsidy as well). Generally, this is where venture capital comes in for new or young ventures, so in some part, I suppose this bank would be filling in for a lack of or an unwillingness of venture capital to fund these projects. If this is the case, I am not sure it is the role of a quasi-governmental agency to play this role. It is easy to see how incentives can become distorted and bad risks are taken or underperforming loans are propped up by even more capital.
On the other side, the state may deposit money in out-of-state banks but the returns on those deposits come right back to the state. And if the state bank is going to underperform - which is almost certainly is be definition, undercutting or taking on more risk - then this will lower the returns on those deposits and essentially this becomes a taxpayer subsidy for business. And we could do that much more effectively through more direct measures.
So what this does, potentially, is create essentially a less efficient bank that will pay lower interest on the deposits of state agencies in order to either, one, offer lower-interests loans to Oregon projects that could get credit elsewhere, or two, fund more risky and/or less worthy projects and this would all lead to higher costs for Oregon taxpayers.
Now, it is possible that I don't understand how much of a disadvantage are in-state projects and how they cannot access funds from regular in-state and out-of-state commercial banks. Anyone want to educate me?
Because at first blush, I just don't see it.
PS, the North Dakota idea is 90 years old, from a time when credit for rural North Dakotan farmers was hard to access. The world has changed a lot since then.