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1936
People's State Bank of Parshall, ND opens it doors.
1968
The Petersen family purchased controlling interest in Lakeside State Bank and today the family remains Cornerstone Bank's largest shareholder.
1982
The Petersen family expanded into Watford City creating McKenzie County Bank.
2006
Cornerstone Holding Company, Inc. began when six Fargo based successful entrepreneurs purchased Citizens State Bank in Enderlin.
2008
The Petersen family acquired Peoples Bank in Makoti, Plaza, and Parshall, which has roots back to 1936.
2014
On December 31, 2014, Cornerstone Holding Company, Inc. and Lakeside Holding Company merged.
2016
March 2016, Cornerstone Bank expanded, into the Dickinson market with the opening of a full service bank location.
2016
June 2016, Cornerstone Bank further expanded, by purchasing the First Interstate Bank location in Sioux Falls.
2018
December 2018, the Sioux Falls team moved into their brand new bank building located at the corner of 69th and Louise.
2019
August 2019, Lakeside Insurance Agency, Inc. became Cornerstone Insurance Services, Inc. Located in Cornerstone Bank in New Town.
2022
January 2022, the Bismarck team moved into their brand new bank building.