The Mainzer Volksbank belongs to the very-Central-European institution of cooperative banks.
Germany has a number of banks governed by public law, privately-owned banks and cooperative banks, owned in effect by their customers.
Total of around 1,250 with 16 million members (= owners), 12,500 branches and around 16% of financial business in Germany.
The MVB's pretty good - excellent on-line banking and and good personal service if you need it. A bit "folksy" at times and I've had a run in (or two) with them on occasion when they get stuck in 19th C mode.
But on the whole - pretty good.
And they've got the coolest logo, with a reflection of the Johanneskirche in the background