Acquisitions Finite Lived Intangible Assets Acquired as Part of a Business Combination (Details) - Core Deposits Intangibles - USD ($) $ in Thousands	Jul. 24, 2015	Jul. 31, 2014
Mountain West Bank
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 11,014
Finite-Lived Intangible Asset, Useful Life		10 years
United Bank [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 695
Finite-Lived Intangible Asset, Useful Life	10 years