What is a "Confessional" Church?

I recently found a website for a Reformed church that listed it as a "Confessional" one, and I honestly wasn't sure what this meant, so I did a little research.  Initially, I thought that "confessional" merely referred to a church that followed the teaching of the Westminster Divines, but it's actually more than that.  A confessional church is one that adheres to the divines (with larger and shorter catechisms), but also to the Three Forms of Unity as well, which is composed of the Heidelberg Catechism, the Belgic Confession, the Canons of Dordrecht and the Ecumenical Creeds (Apostles and Nicene creeds, etc.).  All good and sound doctrines - in fact we've been using the Heidelberg catechism as part of our family worship, and, notwithstanding the errors about infant baptism, it's a solid overview of the tenants of the Christian faith.)