Dividends and Share Repurchases (Details) - $ / shares			3 Months Ended		9 Months Ended
	Jul. 24, 2017	May 19, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dividends Payable [Line Items]
Cash dividends per share (in dollars per share)		$ 0.15	$ 0.15	$ 0.14	$ 0.69	$ 0.41
Stock repurchased (in shares)			811,034
Average cost per share (in dollars per share)			$ 32.14
Warrants outstanding (in shares)			335,496		335,496
Remaining shares authorized to be repurchased (in shares)			3,245,187		3,245,187
Subsequent Event
Dividends Payable [Line Items]
Dividends declared (in dollars per share)	$ 0.15
2008 Troubled Asset Relief Program
Dividends Payable [Line Items]
Stock issued during period (in shares)			100,860