Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Commitments to Extend Credit
Commitments and Contingencies
Commitments outstanding	$ 266.8
Standby Letters of Credit
Commitments and Contingencies
Commitments outstanding	7.5
Commitments to Originate Mortgage Loans Held-for-Sale at Fixed Prices
Commitments and Contingencies
Commitments outstanding	63.3
Forward Sales Commitments
Commitments and Contingencies
Commitments outstanding	$ 88.0