Acquisitions Finite Lived Intangible Assets Acquired as Part of a Business Combination (Details) (Core Deposits [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
Jul. 31, 2014	Sep. 30, 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 0 months 0 days

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration