Loans (Details 9) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	$ 586,592	$ 571,806
Residential real estate, 1-4 family residential [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	132,072	145,088
Residential real estate, 1-4 family residential [Member] | Performing [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	129,533	140,070
Residential real estate, 1-4 family residential [Member] | Nonperforming [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	2,539	4,018
Residential real estate, Home equity lines of credit [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	24,110	21,943
Residential real estate, Home equity lines of credit [Member] | Performing [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	23,580	21,644
Residential real estate, Home equity lines of credit [Member] | Nonperforming [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	530	299
Consumer, Indirect [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	119,720	118,743
Consumer, Indirect [Member] | Performing [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	119,577	118,617
Consumer, Indirect [Member] | Nonperforming [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	143	126
Consumer, Direct [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	11,160	11,596
Consumer, Direct [Member] | Performing [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	11,141	11,583
Consumer, Direct [Member] | Nonperforming [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	19	13
Consumer, Other [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	1,767	1,520
Consumer, Other [Member] | Performing [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	1,766	1,518
Consumer, Other [Member] | Nonperforming [Member]
Investment in residential, consumer and indirect auto loans based on payment activity
Loans	$ 1	$ 2