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Summary of Significant Accounting Policies - Other Narrative (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 payment part segment office | Sep. 30, 2013 | Sep. 30, 2012
Summary of Significant Accounting Policies [Line Items] |  |  |
Number of offices (in offices) | 251 |  |
Days past grace period to initiate contact to cure deficiency | 30 days |  |
Minimum days past due to begin foreclosure proceedings | 90 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 performance period before move to accrual status | 6 months |  |
Number of payments required | 6 |  |
Number of parts in loss percentage factor | 2 |  |
Options outstanding that are not dilutive | 90,846 | 435,825 | 934,880
Number of reportable business segments | 1 |  |
Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Term for payment and rate reduction | 6 months |  |
Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Term for payment and rate reduction | 12 months |  |
Interest rate swap agreements |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Impact to the statement of operations | $ 0 |  |
Accounting Standards Update 2014-01 |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Tax credit from affordable housing program | 3,000,000 |  |
Net investment in affordable housing program | 42,000,000 |  |
Income tax expense from affordable housing program | 4,000,000 |  |
Contingent commitments for affordable housing program | $ 35,000,000 |  |

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