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Stock-Based Compensation Plans - Summary of Restricted Stock Activity (Details) (USD $) | 12 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009 | Sep. 30, 2012
Options outstanding at beginning of period | 606,025 | 633,900 | 713,790 |  |
Options outstanding at end of period | 481,210 | 606,025 | 633,900 | 713,790 |
Options outstanding weighted average exercise price at beginning of period | $ 14.96 | $ 14.00 | $ 12.23 |  | $ 17.52
Options outstanding weighted average remaining term | 3.8 | 3.5 | 4.1 | 4.5 |
Options outstanding weighted average grant date fair value at beginning of period | $ 4,216 | $ 4,206 | $ 4,246 |  | $ 3,782
Options outstanding weighted average grant date fair value forfeited | 10 | 9 | 0 |  |
Restricted stock awards |  |  |  |  |
Options outstanding at beginning of period |  |  | 7,650 |  |
Options vested |  |  | 7,530 |  |
Options forfeited |  |  | 120 |  |
Options outstanding at end of period |  |  | 0 | 7,650 |
Options outstanding weighted average exercise price at beginning of period |  |  | $ 21.23 |  |
Options outstanding weighted average exercise price vested |  |  | 21.22 |  |
Options outstanding weighted average exercise price forfeited |  |  | $ 22.03 |  |
Options outstanding weighted average remaining term |  |  |  | .3 |
Options outstanding weighted average grant date fair value at beginning of period |  |  | 163 |  |
Options outstanding weighted average grant date fair value vested |  |  | 160 |  |
Options outstanding weighted average grant date fair value forfeited |  |  | $ 3 |  |

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