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Prism Bank, History
The following are major historical events for Prism Bank, including mergers and acquisitions.
| 1909-01-01 | Institution established: Original name:The Oklahoma State Bank Mulhall Oklahoma | |
| 1972-01-01 | Changed name to Oklahoma State Bank | |
| 1987-06-25 | Acquired Eighty Niner Bank of Coyle (4073) in COYLE, OK | |
| 1996-11-12 | Moved bank headquarters from MULHALL, OK to GUTHRIE, OK | |
| 1999-09-20 | Moved bank headquarters from GUTHRIE, OK to OKLAHOMA CITY, OK | |
| 1999-09-20 | Reorganized. | |
| 2005-09-01 | Moved bank headquarters from OKLAHOMA CITY, OK to GUTHRIE, OK |