Fair Value (Valuation Methodology and Unobservable Inputs for Level Three Assets Measured at Fair Value on Non Recurring Basis) (Parenthetical) (Details) (Impaired Loans Specifically Reserved [Member])	Dec. 31, 2012
Impaired Loans Specifically Reserved [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Percentage of collateral value	75.00%