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Significant Accounting Policies Bank Acquired Assets (Details) (USD $)
12 Months Ended
Sep. 30, 2011
Oct. 14, 2011
branches
Jan. 08, 2010
Assets Acquired from FDIC, Loans and Foreclosed Real Estate  $ 1,190,000,000
Assets Acquired from FDIC, Loans  968,000,000
Assets Acquired from FDIC, Foreclosed Real Estate  32,000,000
Acquisition from FDIC, Liabilities Assumed  1,030,000,000
Acquisition from FDIC, Deposits Assumed  820,000,000
FDIC Loss Share Coverage, Percentage of Dollar Limit80.00%  
FDIC Loss Share Threshhold, Value536,000,000  
FDIC Loss Share, Percentage of Coverage over Thresshold95.00%  
FDIC Loss Sharing, Residential Real Estate Loans, Term10 years  
FDIC Loss Sharing, Non Residential Real Estate Loans, Term5 years  
FDIC Loss Sharing, Loss Recoveries, Term8 years  
Number of Institutions 6 
Acquisition [Member]
   
Business Combination, Deposits 254,821,000 
Business Combination, Unamortized Premium on Acquisition  1,061,000 
Albequerque Branches [Member]
   
Number of Institutions 4 
Santa Fe Branches [Member]
   
Number of Institutions 2