Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Commitments to Extend Credit
Commitments and Contingencies
Commitments outstanding	$ 268.3
Standby Letters of Credit
Commitments and Contingencies
Commitments outstanding	6.5
Commitments to Originate Mortgage Loans Held-for-Sale at Fixed Prices
Commitments and Contingencies
Commitments outstanding	58.0
Forward Sales Commitments
Commitments and Contingencies
Commitments outstanding	$ 82.9