Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3,598	$ 3,131	$ 9,687	$ 11,481
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses) on available-for-sale securities arising during the period	46	(158)	62	158
Reclassification adjustment for realized gains included in net income		(1)	(84)	(230)
Other comprehensive income (loss)	46	(159)	(22)	(72)
Comprehensive income	$ 3,644	$ 2,972	$ 9,665	$ 11,409