Employee Benefits (Details Textuals) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended				12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010 Year Person Contract	Sep. 30, 2009	Oct. 01, 1997	Sep. 30, 2011 2004 plan [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2010 Stock Options [Member]	Nov. 30, 2008 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2011 Unrestricted Commons Shares to a Retiring Director [Member]	Nov. 30, 2011 Restricted Stock Units and Restricted Stock Shares [Member]	Nov. 30, 2009 Restricted Stock Units and Restricted Stock Shares [Member]	Sep. 30, 2011 Restricted Stock Units and Restricted Stock Shares [Member]	Sep. 30, 2010 Restricted Stock Units and Restricted Stock Shares [Member]	Sep. 30, 2011 Expired Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant					3,000
Options granted	73				1,501										4,479
Granted, Shares								94			214	105
Maximum terms					ten years
Options outstanding	988	1,425											196
Stock based compensation	$ 2,614	$ 1,866	$ 1,092			$ 495	$ 908			$ 110			$ 2,009	$ 958
Stock based compensation						387			1,996
Outstanding end of period, Aggregate intrinsic value	3,039
Weighted average grant-date fair value of restricted shares and restricted share units									$ 22.83		$ 22.93	$ 22.18	$ 22.63
Aggregate Intrinsic value													$ 3,077,000
Number of restricted shares vested									18
Employee Benefits (Textuals) [Abstract]
Percentage of employers contribution as percentage of employees contribution	50.00%
A maximum percentage of employers contribution on eligible compensation	3.00%
Discretionary and matching contributions to plan	1,228	1,282	1,188
Minimum rate of payroll deduction				1.00%
Maximum rate of payroll deduction				15.00%
Additional rate of match by Meridian				5.00%
Rate of exercise price of underlying common shares	100.00%
Number of employees to which conversion impacted		50
Employees compensation expense		472
Weighted average remaining vesting period	2.32 years
Weighted average grant-date fair value of options granted	$ 4.97	$ 6.70	$ 11.05
Total income tax benefit recognized in stock-based compensation arrangements	865	665	367
Stock compensation expense to adjust estimated forfeiture rates to actual	39	17	42
Total intrinsic value of options exercised	8,038	813	2,560
Total grant-date fair value of options that vested	1594	1558	2019
Cash received from options exercised	1,721	592	1,243
Tax benefits realized and recorded to additional paid-in capital from option exercises	$ 1,256	$ 403	$ 233