Consolidated Statements of Comprehensive Income Parenthetical (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Statement of Comprehensive Income [Abstract]
Unrealized holding gain (loss) on securities arising during period, tax	$ (7,975)	$ 312	$ 716
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	3,823	(716)	0
Pension and Other Postretirement Benefit Plans, for Net Transition (Asset) Obligation, Before Reclassification Adjustment, Tax	(44)	(119)	0
Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	160	323	0
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Transition (Asset) Obligation, Tax	15	0	0
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	$ (13)	$ 0	$ 0