Fair Value (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, principal balance	$ 27,197		$ 29,225
Impaired loans allowance	1,356		1,852
Collateral Dependent Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, principal balance	11,325		12,535
Impaired loans allowance	1,243		1,738
Impaired loans, additional provisions	$ 201	$ 401