Fair Value Measurements and Fair Value of Financial Instruments (Assets Measured at Fair Value on a Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	$ 220	$ 4,790
Other real estate owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		1,300
Significant Unobservable Inputs (Level 3) [Member] | Impaired loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	220	4,790
Significant Unobservable Inputs (Level 3) [Member] | Other real estate owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		$ 1,300