In the teller system, you can configure exactly how check holds should be calculated, including default hold days as well as calculated hold days by check R&T or amount. 
In both teller posting and ATM processing, CU*BASE also allows an Electronic Hold configuration that can be used in conjunction with a "Member in Good Standing" configuration. Different levels of hold times can be configured based on the 'Member in Good Standing' and also within the Tiered Scoring feature.
Using these CU*BASE tools the credit union can implement their desired Funds Availability disclosure