Fair Value Measurements, Quantative information (Details) (Nonrecurring [Member], Discounted Appraised Value [Member], Level III [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Impaired Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Level III financial assets fair value	$ 1,800	$ 1,178
Impaired Loans [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)	10.00%	10.00%
Impaired Loans [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)	30.00%	30.00%
Impaired Loans [Member] | Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)	21.00%	21.00%
Other real estate owned [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Level III financial assets fair value	$ 2,310
Other real estate owned [Member] | Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)		12.00%
Other real estate owned [Member] | Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)		12.00%
Other real estate owned [Member] | Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Unobservable inputs value assumptions percentage (in hundredths)		12.00%