Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Commercial real estate	$ 27,800	$ 33,970
Commercial operating	132,040	119,102
Home equity	25,255	24,804
Other	46,430	44,433
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Asset	231,525	222,309
Number of expected days to fund commitments	ninety days
Financial Standby Letter of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Asset	$ 3,351	$ 6,267
Period when letters of credit expire	one year or less