Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 20,718	$ 20,472
Other comprehensive income (loss), net of tax:
Changes in unrealized holding gains (losses) on AFS securities, net of deferred income taxes of $1,700 and $(471)	(2,798)	776
Comprehensive income	$ 17,920	$ 21,248