Dividends - Narrative (Details) (USD $)	0 Months Ended	3 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Jul. 15, 2014	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Oct. 21, 2014 Subsequent Event [Member]	Sep. 30, 2014 Subsequent Event [Member]	Dec. 31, 2014 Mutual Holding Company [Member] Subsequent Event [Member]
Dividends [Line Items]
Dividends payable, date declared		Jul. 15, 2014				Oct. 21, 2014
Common stock, dividends, per share, declared (in dollars per share)	$ 0.18	$ 0.180		$ 0.175	$ 0.18
Annual dividend rate per share (in dollars per share)	$ 0.72		$ 0.70			$ 0.72
Dividends payable, date of record	Aug. 15, 2014					Nov. 14, 2014
Dividends payable, date to be paid	Aug. 29, 2014					Nov. 28, 2014
Dividend waiver by parent (in dollars per share)							$ 0.80