Certificates of Deposits (Details) (USD $) In Millions	3 Months Ended
	Jun. 30, 2011	Mar. 31, 2011
Deposits Liabilities, Balance Sheet, Reported Amounts [Abstract]
Incentives Paid in Lieu of Future Interest to Certificate Holders		$ 0.6
Certificates of Deposits Redeemed in Connection with Incentive Offers		12.4
Payments to Redeem and Close Certificates of Deposits Prior to their Maturity Dates	172.7	85.2
Future Interest Paid on Certificates of Deposit Being Redeemd in Period	$ 6.9	$ 3.6