Fair Value (Activity in borrowings carried at fair value) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Short-term Debt, Fair Value [Roll Forward]  
Borrowings carried at fair value - beginning of year $ 5,242
Paydowns and maturities (5,209)
Net unrealized change in fair value (33)
Borrowings carried at fair value - December 31 0
Unpaid principal balance - December 31 $ 0