This is absolutely not a "typical postdoctoral salary", and hasn't been for more than two decades. Most major research institutions follow NIH guidelines for postdoc salaries:
https://www.training.nih.gov/postdoctoral_irta_stipend_range...
https://www.training.nih.gov/postdoctoral_irta_stipend_range...
NIH minimum in 2009 was >$37K. If you were getting offers in the $27K-$30K range coming out of a comp bio/bioinformatics PhD program, you were unfortunately getting seriously low-balled.