Securities - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013 Security	Sep. 30, 2012	Jun. 30, 2013
Schedule of Investments [Line Items]
Securities in Unrealized Loss Positions For Twelve Months Or More, Qualitative Disclosure, Number of Positions	5
Securities in Unrealized Loss Positions For Less Than Twelve Months, Qualitative Disclosure, Number of Positions	124
Proceeds from Sale of Available-for-sale Securities, Debt	$ 0	$ 0
Gross realized gains on sale of available-for-sale securities	0	0
Other than temporary impairment of available-for-sale security	0	0
Securities Pledged as Collateral for Deposits in Excess of FDIC Insurance Limits, Fair Value	193.2		200.9
Securities Pledged as Collateral for Potential Borrowings at the Federal Reserve Bank Discount Window	5.2		5.2
Federal Home Loan Bank Stock [Member]
Schedule of Investments [Line Items]
Other than temporary impairment of available-for-sale security	$ 0	$ 0