Fair Value Measurements and Fair Value of Financial Instruments (Additional Qualitative Information about Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range		0.00
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range		-30%
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range		(24.10%)
Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 9,749	$ 11,616
Fair Value Disclosure, Unbservable Input Range	0-30% (11.77)%
Impaired Loans [Member] | Unobservable Inputs Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques		Appraisal of collateral(1)
Fair Value Disclosure, Unbservable Input Range	Appraisal adjustments(2)	Appraisal adjustments(2)
Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques	Appraisal of collateral(1)
Foreclosed Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 1,297	$ 852
Fair Value Disclosure, Unbservable Input Range	20%	20%
Foreclosed Real Estate Owned [Member] | Unobservable Inputs Appraisal Adjustments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Disclosure, Unbservable Input Range		Liquidation Expenses(2)
Foreclosed Real Estate Owned [Member] | Unobservable Inputs - Liquidation Expenses [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques		Appraisal of collateral(1)(3)
Fair Value Disclosure, Unbservable Input Range	Liquidation Expenses(2)
Foreclosed Real Estate Owned [Member] | Significant Unobservable Inputs (Level 3) [Member] | Unobservable Inputs - Liquidation Expenses [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques	Appraisal of collateral(1)(3)