Derivatives (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 item
Purchase Contracts
Derivatives
Number of Contracts	531
Notional	$ 302,725
Fair Value	1,018
Purchase Contracts | TBA agreements
Derivatives
Number of Contracts	19
Notional	202,646
Fair Value	54
Purchase Contracts | IRLCs
Derivatives
Number of Contracts	512
Notional	100,079
Fair Value	964
Sale Contracts
Derivatives
Number of Contracts	295
Notional	976,076
Fair Value	(1,526)
Sale Contracts | TBA agreements
Derivatives
Number of Contracts	27
Notional	708,076
Fair Value	(1,511)
Sale Contracts | Eurodollar futures contracts
Derivatives
Number of Contracts	268
Notional	268,000
Fair Value	$ (15)