Summary of Significant Accounting Policies Mortgage Servicing Rights Notional Fair Value Derivatives (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	$ 1,167	$ 8,496
Interest rate lock with customers [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	181,583	140,682
Derivative Asset, Fair Value, Gross Asset	3,888	777
Derivative Liability, Notional Amount	1,593	50,527
Derivative Liability, Fair Value, Gross Liability	(10)	(760)
Derivative, Fair Value, Net	3,878	17
Forward Commitments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	3,178	558,861
Derivative Asset, Fair Value, Gross Asset	13	8,479
Derivative Liability, Notional Amount	173,208	0
Derivative Liability, Fair Value, Gross Liability	(2,724)	0
Derivative, Fair Value, Net	$ (2,711)	$ 8,479