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Subsequent Event (Details) (USD $)
 0 Months Ended
Sep. 30, 2012
Offices
Sep. 30, 2011
Oct. 31, 2012
Subsequent Event [Member]
WesternStates
Offices
Oct. 31, 2012
Subsequent Event [Member]
South Valley Bank [Member]
Subsequent Event [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares       1,995,936
Business Acquisition, Cost of Acquired Entity, Cash Paid       $ 10,400,000
Business Acquisition, Cost of Acquired Entity, Purchase Price       44,000,000
Number of offices (in offices) 166   190  
Number of States in which Entity Operates     8  
Assets 12,472,944,000 13,440,749,000 13,300,000,000  
Deposits     $ 9,300,000,000