Derivative Financial Instruments - Schedule of Offsetting Derivative Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013
Counterparty A
Derivative [Line Items]
Derivative Asset - Gross Amount Reported on Balance Sheet	$ 0	$ 4
Derivative Asset - Netting Adjustment	0	(4)
Cash Collateral Posted	0	0
Derivative Assets - Net Exposure	0	0
Derivative Liability - Gross Amount Reported on Balance Sheet	10,037	11,025
Derivative Liability - Netting Adjustment	0	(4)
Derivative Liability - Cash Collateral Received	6,260	8,084
Derivative Liabilities - Net Exposure	3,777	2,937
Counterparty B
Derivative [Line Items]
Derivative Asset - Gross Amount Reported on Balance Sheet	0	0
Derivative Asset - Netting Adjustment	0	0
Cash Collateral Posted	0	0
Derivative Assets - Net Exposure	0	0
Derivative Liability - Gross Amount Reported on Balance Sheet	32	25
Derivative Liability - Netting Adjustment		0
Derivative Liability - Cash Collateral Received	0	0
Derivative Liabilities - Net Exposure	$ 32	$ 25