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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 Limit | 80.00% |  |
FDIC Loss Share Threshhold, Value | 536,000,000 |  |
FDIC Loss Share, Percentage of Coverage over Thresshold | 95.00% |  |
FDIC Loss Sharing, Residential Real Estate Loans, Term | 10 years |  |
FDIC Loss Sharing, Non Residential Real Estate Loans, Term | 5 years |  |
FDIC Loss Sharing, Loss Recoveries, Term | 8 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 |

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