Fair Value Measurements Notional Amount of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Notional Amount of Derivatives [Abstract]
Best efforts contracts and related committed IRLCs	$ 1	$ 1
Uncommitted IRLCs	26	26
FMBSs related to uncommitted IRLCs	26	26
Best efforts contracts and related mortgage loans held for sale	25	14
FMBSs related to mortgage loans held for sale	44	42
Mortgage loans held for sale covered by FMBSs	$ 45	$ 42

Best Effort Contracts and Related Mortgage Loans Held for Sale

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Forward Sales of Mortgage-Backed Securities Related to Mortgage Loans Held for Sale

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Forward Sales of Mortgage-Backed Securities related to Uncommitted Interest Rate Lock Commitments

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Mortgage Loans Held for Sale Covered by Forward Sales of Mortgage-Backed Securities

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Notional Amount of Best Effort Contracts and Related Committed Interest Rate Lock Commitments

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Notional Amount of Uncommitted Interest Rate Lock Commitments

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