Fair Value Accounting (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Impaired loans	$ 11,909	$ 13,939
Other real estate owned	1,310	1,719
Total assets measured at fair value on a non-recurring basis	13,219	15,658
Fair Value, Inputs, Level 1 [Member]
Assets
Impaired loans
Other real estate owned
Total assets measured at fair value on a non-recurring basis
Fair Value, Inputs, Level 2 [Member]
Assets
Impaired loans	10,319	13,748
Other real estate owned	1,119	1,390
Total assets measured at fair value on a non-recurring basis	11,438	15,138
Fair Value, Inputs, Level 3 [Member]
Assets
Impaired loans	1,590	191
Other real estate owned	191	329
Total assets measured at fair value on a non-recurring basis	$ 1,781	$ 520