Fair Value Accounting and Measurement (Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Impaired Loans [Member], Fair Value, Inputs, Level 3 [Member], Market Approach Valuation Technique [Member], Fair Value, Measurements, Nonrecurring [Member])	12 Months Ended
	Dec. 31, 2012
Minimum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%
Maximum [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%
Weighted Average [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%