When you and your husband opened the savings account and CDs you signed an agreement with the credit union. In the fine print you both gave a "right of offset" to the credit union. That is why your account was frozen. This is a common term in credit union accounts.
It may be that the statute of limitations has run in Idaho on the original loan. An Idaho attorney can advise you on that. It may also be that the credit can not produce the paperwork to back up their allegation that your husband owes this money. Ask them to produce the loan documents or at least copies of them. If they have no evidence, then they must release the money.
The credit union's name change is not relevant. It sounds like there is some serious money at stake. It would be fairly cheap to hire an attorney to challenge the freeze and demand that they produce evidence of the debt or release the money. Good Luck.
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Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.
Credit unions do not rely on credit history as much as banks do & the reason they do this is because when any account is open, they link any debt to your deposit accounts in a process called "cross collateralization."
This means that you have put up your checking & savings account as collateral for any loan you have with them, now or in the distant past.
Sorry, I believe what they have done is consistent with the laws pertaining to credit unions.