Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,131	$ 3,062	$ 11,481	$ 7,491
Other comprehensive income (loss), net of tax:
Unrealized holding (losses) gains on available-for-sale securities arising during the period	(158)	44	158	401
Reclassification adjustment for realized gains included in net income	(1)	(2)	(230)	(109)
Other comprehensive (loss) income	(159)	42	(72)	292
Comprehensive income	$ 2,972	$ 3,104	$ 11,409	$ 7,783