Fair Value Measurements Notional Amount of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Notional Amount of Derivatives, [Abstract]
Best efforts contracts and related committed IRLCs	$ 1,080	$ 1,088
Uncommitted IRLCs	39,073	25,912
FMBSs related to uncommitted IRLCs	32,000	26,000
Best efforts contracts and related mortgage loans held for sale	11,791	14,058
FMBSs related to mortgage loans held for sale	43,000	42,000
Mortgage loans held for sale covered by FMBSs	$ 43,191	$ 42,227