Loans Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 14,678	$ 15,211	$ 15,298	$ 15,003
Charge-offs	(183)	(171)	(1,165)	(604)
Recoveries	89	57	251	178
Provision	0	150	200	670
Allowance for Loan Losses, Ending Balance	14,584	15,247	14,584	15,247
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	809	0	809	853
Allowance for loan losses - Loans Collectively Evaluated for Impairment	14,584	14,438	14,584	14,438	14,445
Ending Loan Balance - Individually Evaluated for Impairment	3,411	4,843	3,411	4,843	5,253
Ending Loan Balance - Collectively Evaluated for Impairment	1,239,959	1,148,108	1,239,959	1,148,108	1,167,088
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,552	2,098	2,344	1,927
Charge-offs	(62)	0	(850)	(15)
Recoveries	8	2	48	5
Provision	209	22	165	205
Allowance for Loan Losses, Ending Balance	1,707	2,122	1,707	2,122
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	809	0	809	853
Allowance for loan losses - Loans Collectively Evaluated for Impairment	1,707	1,313	1,707	1,313	1,491
Ending Loan Balance - Individually Evaluated for Impairment	25	1,553	25	1,553	1,432
Ending Loan Balance - Collectively Evaluated for Impairment	87,092	98,870	87,092	98,870	104,104
Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	646	528	601	602
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	4	19	49	(55)
Allowance for Loan Losses, Ending Balance	650	547	650	547
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	650	547	650	547	601
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	33,960	27,265	33,960	27,265	29,149
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,293	3,295	3,050	3,136
Charge-offs	0	(39)	(11)	(206)
Recoveries	0	0	0	0
Provision	15	(82)	269	244
Allowance for Loan Losses, Ending Balance	3,308	3,174	3,308	3,174
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	3,308	3,174	3,308	3,174	3,050
Ending Loan Balance - Individually Evaluated for Impairment	1,497	1,574	1,497	1,574	2,528
Ending Loan Balance - Collectively Evaluated for Impairment	261,607	233,607	261,607	233,607	242,649
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	299	355	304	350
Charge-offs	(7)	(27)	(20)	(69)
Recoveries	2	8	2	17
Provision	(29)	(11)	(21)	27
Allowance for Loan Losses, Ending Balance	265	325	265	325
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	265	325	265	325	304
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	7,570	6,857	7,570	6,857	6,684
Automobile [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,357	4,571	4,536	4,496
Charge-offs	(114)	(105)	(284)	(281)
Recoveries	79	47	201	156
Provision	(14)	119	(145)	261
Allowance for Loan Losses, Ending Balance	4,308	4,632	4,308	4,632
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	4,308	4,632	4,308	4,632	4,536
Ending Loan Balance - Individually Evaluated for Impairment	169	204	169	204	203
Ending Loan Balance - Collectively Evaluated for Impairment	392,183	343,026	392,183	343,026	348,897
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,408	3,451	3,405	3,414
Charge-offs	0	0	0	(33)
Recoveries	0	0	0	0
Provision	(159)	38	(156)	108
Allowance for Loan Losses, Ending Balance	3,249	3,489	3,249	3,489
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	3,249	3,489	3,249	3,489	3,405
Ending Loan Balance - Individually Evaluated for Impairment	1,720	1,512	1,720	1,512	1,090
Ending Loan Balance - Collectively Evaluated for Impairment	457,547	438,483	457,547	438,483	435,605
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,123	913	1,058	1,078
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision	(26)	45	39	(120)
Allowance for Loan Losses, Ending Balance	1,097	958	1,097	958
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	1,097	958	1,097	958	1,058
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	$ 0	$ 0	$ 0	$ 0	$ 0