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Non-Cash Investing and Financing Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   $ 35,972    
Transferred loans to mortgage servicing assets   3,614 $ 2,717 $ 3,581
Transfer of premises and equipment pending disposal to other assets, book value   $ 1,805   $ 1,448
Class A Common Stock        
Class of Stock        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 35,972      
Class A Common Stock | Mountain West Bank        
Class of Stock        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,378,230 1,378,230