Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Commitments to Extend Credit
Commitments and Contingencies
Commitments outstanding	$ 301.7
Standby Letters of Credit
Commitments and Contingencies
Commitments outstanding	5.8
Commitments to Originate Mortgage Loans Held-for-Sale at Fixed Prices
Commitments and Contingencies
Commitments outstanding	32.5
Forward Sales Commitments
Commitments and Contingencies
Commitments outstanding	$ 54.8