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Grinnell State Bank, History
The following are major historical events for Grinnell State Bank, including mergers and acquisitions.
| 1925-10-25 | Institution established: Original name:Grinnell State Bank | |
| 1997-07-14 | Moved bank headquarters from GRINNELL, IA to MARENGO, IA | |
| 2002-08-20 | Moved bank headquarters from MARENGO, IA to GRINNELL, IA | |
| 2011-11-18 | Acquired Polk County Bank (14194) in JOHNSTON, IA as part of a government assisted transaction. |