Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)
Balance at September 30	$ 24	$ 773
Transfers into Level 3
Transfers out of Level 3	(24)	(763)
Total realized and unrealized gains (losses):
Included in other comprehensive (loss) income		18
Purchases		620
Issuances
Sales		(648)
Settlements
Balance at June 30
Mortgage-backed securities [Member]
Schedule of Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)
Balance at September 30	15	69
Transfers into Level 3
Transfers out of Level 3	(15)	(68)
Total realized and unrealized gains (losses):
Included in other comprehensive (loss) income		(1)
Purchases		620
Issuances
Sales		(620)
Settlements
Balance at June 30
Asset-backed securities [Member]
Schedule of Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)
Balance at September 30	9
Transfers into Level 3
Transfers out of Level 3	(9)
Total realized and unrealized gains (losses):
Included in other comprehensive (loss) income
Purchases
Issuances
Sales
Settlements
Balance at June 30
U.S. Government Obligations [Member]
Schedule of Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)
Balance at September 30		704
Transfers into Level 3
Transfers out of Level 3		(695)
Total realized and unrealized gains (losses):
Included in other comprehensive (loss) income		19
Purchases
Issuances
Sales		(28)
Settlements
Balance at June 30