Fair Value Measurements Notional Amount of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Notional Disclosures [Abstract]
Best efforts contracts and related committed IRLCs	$ 3,291	$ 1,184
Uncommitted IRLCs	65,424	25,854
FMBSs related to uncommitted IRLCs	66,000	26,000
Best efforts contracts and related mortgage loans held for sale	5,709	25,441
FMBSs related to mortgage loans held for sale	47,000	44,000
Mortgage loans held for sale covered by FMBSs	$ 47,223	$ 44,524