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
Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques			Appraisal of collateral	[1],[2]
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 4,451		$ 3,075
Fair Value Measurements, Valuation Techniques	Appraisal of collateral	[1]	Appraisal of collateral	[1]
Significant Unobservable Inputs (Level 3) [Member] | Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 456		$ 105
Fair Value Measurements, Valuation Techniques	Appraisal of collateral	[2],[3]
Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member] | Impaired Loan [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	10.00%	[3]	10.00%	[3]
Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member] | Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	15.00%
Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range			15.00%	[3]
Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member] | Impaired Loan [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	95.00%	[3]	95.00%	[3]
Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member] | Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	40.00%
Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range			40.00%	[3]
Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member] | Impaired Loan [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	28.00%	[3]	28.00%	[3]
Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member] | Foreclosed Assets Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range	24.00%
Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member] | Foreclosed Assets Held for Sale [Member] | Unobservable Input Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range			24.00%	[3]

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally includes various level 3 inputs which are not identifiable.

[2] Includes qualitative adjustments by management and estimated liquidation expenses.

[3] 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 percent of the appraisal.