Non-Cash Investing and Financing Activities (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 31, 2014
Class of Stock
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 35,972
Transferred loans to OREO	5,198	11,545	43,541
Transferred loans to mortgage servicing assets	2,717	3,581	4,563
Transfer of premises and equipment pending disposal to other assets, book value		1,448	566
Transfer from Investments		429
Transfer of preferred stock pending redemption from equity to liability			50,000
Class A Common Stock
Class of Stock
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned				35,972
Mountain West Bank | Class A Common Stock
Class of Stock
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1,378,230			1,378,230