Federal Home Loan Bank Advances (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Federal Home Loan Bank Advances [Abstract]
Collateral under borrowing agreements with FHLB	$ 683,300,000
Federal home loan bank advances	75,609,000	225,750,000
Remaining discount on Federal home loan bank advances	241,000	319,000
Scheduled Maturities [Abstract]
2013	25,000,000
2014	35,000,000
2015	0
2016	15,000,000
2017	0
Thereafter	609,000
Federal home loan bank advances, Total	75,609,000
Weighted average interest rates [Abstract]
2013 (in hundredths)	0.21%
2014 (in hundredths)	1.79%
2015 (in hundredths)	0.00%
2016 (in hundredths)	2.87%
2017 (in hundredths)	0.00%
Thereafter (in hundredths)	2.48%
Weighted average interest rate (in hundredths)	1.49%
Amount of advances of FHLB	60,000,000
Restructuring of one-time charge	2,100,000
Weighted average interest rate of advances of FHLB (in hundredths)	1.91%
Borrowing availability with FHLB, federal reserve bank discount window and other correspondent banks	$ 1,500,000,000