If I were you I would make a list of what you’re looking for and start calling the local banks/credit unions.

Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

The property manager should NEVER release the credit report to an owner. 

Quote from @Akmal Normuratov: @Chris Seveney got it thanks You could get rates in the 9-10.5% range if you have a good credit score. 

Many local banks and credit unions will do a second up to 89.99% loan to value.

After everything was fixed and they listed the unit, apparently they claimed that I was not allowed to have any understanding of who would be renting my home due to potential bias and discrimination (this is the first time I have not been able to view applicants general profile (credit score/occupation(removing any identity markers)), but fine, I let them choose the tenant and so far there hasn't been any issues.

Has anybody used, or have any experience with Credit Union Mortgage Association for financing real estate deals? 

Most new investors consider the lowest interst rate as most important.  

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

My local credit union won't do it either, they also won't do a business LOC because the business is only 1.5 years old.