I agree with Carsten Schultz about Küchenradio.
While Freak Show by Metaebene looks like a tech podcast with up to 5 people discussing news at first, it's not a typical interview podcast and it's also not just a collection of news bits. They tend to digress a lot resulting in long episodes. If tech and length don't turn you off, you might want to give this a try.
Holger Klein's Realitätsabgleich and Wrintheit are discussions between 2 people for about 1 to 2 hours and published along with his other podcasts on wrint.de.
Previously Tim from Metaebene and Holgi published a podcast called Not Safe For Work that might also be what you are looking for and be worth listening to despite the provocative title. In some episodes they talk about videos from Kurt Razelli featuring austrian dialect where Tim expresses his admiration for this dialect.
Alternativlos is a podcast by Frank Rieger and Felix von Leitner
focused more on politics and history than on tech. At the time of writing the latest episode featured Sascha Lobo as a guest. Note while there is usually an interesting discussion between the two and available guests, the format may be changed to an interview style as in episode 24 with Mathias Döpfner. The podcast doesn't have a regular schedule.
Schall und Rauch
Alexander und Christian, zwei mittelreife Früchte der 70er, sozialisiert in den 80ern veröffentlichen ihre monatlichen Schwätzchen auf der Parkbank.