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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |
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Sep. 30, 2012 Offices segments | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 16, 2011 Western National Bank [Member] branches | Oct. 14, 2011 Charter Bank [Member] branches | Jan. 08, 2010 Horizon Bank [Member] LossShareAgreements | Sep. 30, 2012 Horizon Bank [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Maximum [Member] | Oct. 14, 2011 Albequerque Branches [Member] Charter Bank [Member] branches | Oct. 14, 2011 Santa Fe Branches [Member] Charter Bank [Member] branches
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of offices (in offices) | 166 |  |  |  |  |  |  |  |  |  |
Acquisition from FDIC |  |  |  | $ 53,000,000 |  | $ 820,000,000 |  |  |  |  |
Number of branches acquired (in branches) |  |  |  | 3 | 6 |  |  |  |  | 4 | 2
Assets acquired |  |  |  | 177,000,000 |  |  |  |  |  |  |
Loans acquired |  |  |  | 143,000,000 |  |  |  |  |  |  |
Foreclosed real estate acquired |  |  |  | 7,000,000 |  |  |  |  |  |  |
Liabilities assumed |  |  |  | 153,000,000 |  |  |  |  |  |  |
Deposits acquired |  |  |  | 136,000,000 |  |  |  |  |  |  |
Cash received from the FDIC |  |  |  | 30,000,000 |  |  |  |  |  |  |
Deposits acquired |  |  |  |  | 254,821,000 |  |  |  |  |  |
Unamortized premium on acquisition |  |  |  |  | 1,061,000 |  |  |  |  |  |
Acquisition from FDIC, liabilities assumed |  |  |  |  |  | 1,030,000,000 |  |  |  |  |
Assets acquired from FDIC, foreclosed real estate |  |  |  |  |  | 32,000,000 |  |  |  |  |
Assets acquired from FDIC, loans |  |  |  |  |  | 968,000,000 |  |  |  |  |
Assets acquired from FDIC |  |  |  |  |  | 1,190,000,000 |  |  |  |  |
Number of loss share agreements |  |  |  |  |  | 2 |  |  |  |  |
FDIC loss share threshhold value |  |  |  |  |  | $ 536,000,000 |  |  |  |  |
FDIC loss share coverage percentage of dollar limit |  |  |  |  |  |  | 80.00% |  |  |  |
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 |  |  |  |  |
Days past grace period to initiate contact to cure deficiency | 30 days |  |  |  |  |  |  |  |  |  |
Minimum days past due to begin foreclosure proceedings | 90 days |  |  |  |  |  |  |  |  |  |
Minimum days past due to stop accrual of interest | 90 days |  |  |  |  |  |  |  |  |  |
Loans returned to full accrual status | 90 days |  |  |  |  |  |  |  |  |  |
Intangible, useful life |  |  |  |  |  |  |  | 5 years | 8 years |  |
Number of reportable business segments | 1 |  |  |  |  |  |  |  |  |  |
Options outstanding that are not dilutive | 934,880 | 2,190,123 | 1,941,633 |  |  |  |  |  |  |  |

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