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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 20, 2016, the Company announced the signing of a definitive agreement to acquire Treasure State Bank, a community bank based in Missoula, Montana. Treasure State Bank provides banking services to individuals and businesses in the greater Missoula market. As of December 31, 2015, Treasure State Bank had total assets of $71,000,000, gross loans of $53,000,000 and total deposits of $58,000,000. Upon closing of the transaction, which is anticipated to take place in the third quarter of 2016, Treasure State Bank will be merged into the Bank and will become part of the First Security Bank of Missoula division.