Fair Value Measurements Notional Amount of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Notional Disclosures [Abstract]
Best efforts contracts and related committed IRLCs	$ 4,417	$ 1,184
Uncommitted IRLCs	79,594	25,854
FMBSs related to uncommitted IRLCs	80,000	26,000
Best efforts contracts and related mortgage loans held for sale	3,025	25,441
FMBSs related to mortgage loans held for sale	55,000	44,000
Mortgage loans held for sale covered by FMBSs	$ 54,720	$ 44,524