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Armstrong Bank, History
The following are major historical events for Armstrong Bank, including mergers and acquisitions.
| 1910-03-15 | Institution established: Original name:Vian State Bank | |
| 1988-07-14 | Acquired The Security Bank (19965) in WARNER, OK | |
| 1991-07-19 | Acquired Sequoyah State Bank of Muldrow (20312) in MULDROW, OK | |
| 1994-07-01 | Acquired Lake Country Bank (12289) in WEBBERS FALLS, OK | |
| 1996-04-22 | Changed name to Armstrong Bank | |
| 1999-07-08 | Moved bank headquarters from VIAN, OK to CHECOTAH, OK | |
| 2001-03-16 | Moved bank headquarters from CHECOTAH, OK to MUSKOGEE, OK | |
| 2015-05-23 | Acquired Benefit Bank (35281) in FORT SMITH, AR | |
| 2019-11-20 | Change trust powers from TRUST POWERS NOT GRANTED to FULL TRUST POWERS GRANTED | |
| 2020-03-21 | Acquired Republic Bank & Trust (27286) in NORMAN, OK |