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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 26, 2017, the Company announced the signing of a definitive agreement to acquire Inter-Mountain Bancorp, Inc. and its wholly-owned subsidiary, First Security Bank, a community bank based in Bozeman, Montana (collectively, “FSB”). FSB provides banking services to individuals and businesses throughout Montana with banking offices located in Bozeman, Belgrade, Big Sky, Choteau, Fairfield, Fort Benton, Three Forks, Vaughn and West Yellowstone. As of September 30, 2017, FSB had total assets of $1,009,623,000, gross loans of $657,626,000 and total deposits of $873,572,000. Upon closing of the transaction, which is anticipated to take place in the first quarter of 2018, FSB will become a new Bank division headquartered in Bozeman. Big Sky Western Bank, the Bank’s existing Bozeman-based division will combine with the new FSB division. The agriculture-focused northern branches of FSB, located in the area known as the Golden Triangle, will combine with the Bank’s First Bank of Montana division.