Catalysis of the reaction: 3-alpha,7-alpha,12-alpha-trihydroxy-5-beta-cholan-24-oylglycine + H2O = 3-alpha,7-alpha,12-alpha-trihydroxy-5-beta-cholanate + glycine.
3alpha,7alpha,12alpha-trihydroxy-5beta-cholan-24-oylglycine amidohydrolase activity