Derivative Instruments - Schedule of settlement of fair value hedges (Details) (Fair value hedges, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Notes payable and debt
Derivative [Line Items]
Cumulative reduction to interest expense	$ 17,879	$ 13,973
Remaining balance	3,744	7,651
Weighted average years remaining to maturity	1 year 0 months 0 days	2 years 0 months 0 days
Deposit liabilities
Derivative [Line Items]
Cumulative reduction to interest expense	33,379	17,060
Remaining balance	$ 199,816	$ 216,135
Weighted average years remaining to maturity	23 years 10 months 24 days	25 years 10 months 24 days