Fair Value Measurements (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	$ 6,969		$ 2,415
Valuation Technique	Appraisal of collateral	[1]	Appraisal of collateral	[1]
Unobservable Input	Appraisal adjustments	[2]	Appraisal adjustments	[2]
Foreclosed Assets Held For Resale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	$ 2,059		$ 2,338
Valuation Technique	Appraisal of collateral	[1],[3]	Appraisal of collateral	[1],[3]
Unobservable Input	Appraisal adjustments	[2]	Appraisal adjustments	[2]
Minimum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range	10.00%		10.00%
Minimum [Member] | Foreclosed Assets Held For Resale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range	10.00%		10.00%
Maximum [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range	50.00%		50.00%
Maximum [Member] | Foreclosed Assets Held For Resale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range	50.00%		50.00%

[1] (1) Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable.

[2] (2) Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percentage of the appraisal.

[3] (3) Includes qualitative adjustments by management and estimated liquidation expenses.