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Summary of Significant Accounting Policies - Other Narrative (Details) | 12 Months Ended
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Sep. 30, 2013 segments office | Sep. 30, 2012 | Sep. 30, 2011
Summary of Significant Accounting Policies [Line Items] |  |  |
Number of offices (in offices) | 182 |  |
Days past grace period to initiate contact to cure deficiency | 30 days |  |
Approximate rate reduction concession, minimum | 1.00% |  |
Approximate rate reduction concession, maximum | 2.00% |  |
Minimum days past due to stop accrual of interest | 90 days |  |
Loans returned to full accrual status | 90 days |  |
Minimum days past due to begin foreclosure proceedings | 90 days |  |
Minimum performance period before move to accrual status | 6 months |  |
Options outstanding that are not dilutive | 435,825 | 934,880 | 2,190,123
Number of reportable business segments | 1 |  |
Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Term for payment and rate reduction | 6 months |  |
Intangible, useful life | 5 years |  |
Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Term for payment and rate reduction | 24 months |  |
Intangible, useful life | 8 years |  |

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