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Stock-Based Compensation Plans - Summary of Stock Activity (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Options outstanding at beginning of period | 481,210 | 606,025 | 633,900 |
Options granted | 46,180 | 31,690 | 29,160 |
Options exercised | 112,800 | 153,505 | 54,035 |
Options forfeited | 0 | 3,000 | 3,000 |
Options outstanding at end of period | 414,590 | 481,210 | 606,025 | 633,900
Options outstanding weighted average exercise price at beginning of period | $ 17.52 | $ 14.96 | $ 14.00 |
Options outstanding weighted average exercise price - Granted | $ 26.20 | $ 22.25 | $ 25.60 |
Options outstanding weighted average exercise price - Exercised | $ 10.52 | $ 8.62 | $ 9.95 |
Options outstanding weighted average exercise price - forfeited | $ 0 | $ 5.78 | $ 5.84 |
Options outstanding weighted average exercise price at end of period | $ 20.40 | $ 17.52 | $ 14.96 | $ 14.00
Options outstanding weighted average remaining term | 4.2 | 3.8 | 3.5 | 4.1
Options outstanding weighted average grant date fair value at beginning of period | $ 3,782 | $ 4,216 | $ 4,206 |
Options outstanding weighted average grant date fair value | 489 | 281 | 293 |
Options exercised weighted average grant date fair value | 603 | 705 | 274 |
Options forfeited weighted average grant date fair value | 0 | 10 | 9 |
Options outstanding weighted average grant date fair value at end of period | 3,668 | 3,782 | 4,216 | 4,206
Options exercisable at September 30, 2013 | 330,878 |  |  |
Options exercisable weighted average exercise price | $ 19.05 |  |  |
Options exercisable weighted average remaining term | 3.2 |  |  |
Options exercisable weighted average grant date fair value | 2,759 |  |  |
Options vested during twelve months ended September 30, 2013 | 32,912 |  |  |
Options vested weighted average grant date fair value | $ 326 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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