Loans Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 14,434	$ 15,298
Charge-offs	(336)	(890)
Recoveries	80	95
Provision	458	100
Allowance for Loan Losses, Ending Balance	14,636	14,603
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	14,636	14,603	14,434
Ending Loan Balance - Individually Evaluated for Impairment	4,081	2,809	4,488
Ending Loan Balance - Collectively Evaluated for Impairment	1,306,342	1,161,950	1,261,984
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,886	2,344
Charge-offs	(123)	(773)
Recoveries	19	4
Provision	15	44
Allowance for Loan Losses, Ending Balance	1,797	1,619
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	1,797	1,619	1,886
Ending Loan Balance - Individually Evaluated for Impairment	214	37	221
Ending Loan Balance - Collectively Evaluated for Impairment	89,662	89,130	87,672
Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	417	601
Charge-offs	0	0
Recoveries	0	0
Provision	3	11
Allowance for Loan Losses, Ending Balance	420	612
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	420	612	417
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	28,026	27,380	27,815
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,545	3,050
Charge-offs	0	(11)
Recoveries	0	0
Provision	233	340
Allowance for Loan Losses, Ending Balance	3,778	3,379
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	3,778	3,379	3,545
Ending Loan Balance - Individually Evaluated for Impairment	1,810	1,505	1,785
Ending Loan Balance - Collectively Evaluated for Impairment	307,031	253,737	286,334
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	272	304
Charge-offs	(14)	(8)
Recoveries	0	0
Provision	22	12
Allowance for Loan Losses, Ending Balance	280	308
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	280	308	272
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	7,783	7,031	7,649
Automobile [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,206	4,536
Charge-offs	(183)	(98)
Recoveries	61	91
Provision	222	(235)
Allowance for Loan Losses, Ending Balance	4,306	4,294
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	4,306	4,294	4,206
Ending Loan Balance - Individually Evaluated for Impairment	144	182	173
Ending Loan Balance - Collectively Evaluated for Impairment	400,477	353,819	394,031
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,026	3,405
Charge-offs	(16)	0
Recoveries	0	0
Provision	67	(13)
Allowance for Loan Losses, Ending Balance	3,077	3,392
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	3,077	3,392	3,026
Ending Loan Balance - Individually Evaluated for Impairment	1,913	1,085	2,309
Ending Loan Balance - Collectively Evaluated for Impairment	473,363	430,853	458,483
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	1,082	1,058
Charge-offs	0	0
Recoveries	0	0
Provision	(104)	(59)
Allowance for Loan Losses, Ending Balance	978	999
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses - Loans Individually Evaluated for Impairment	0	0	0
Allowance for loan losses - Loans Collectively Evaluated for Impairment	978	999	1,082
Ending Loan Balance - Individually Evaluated for Impairment	0	0	0
Ending Loan Balance - Collectively Evaluated for Impairment	$ 0	$ 0	$ 0