Loans Loan Categories and Past Due Loans(Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	$ 12,158	$ 13,468	$ 12,708
Current Loans	1,422,636	1,399,800	1,297,715
Loans and Leases Receivable, Gross	1,434,794	1,413,268	1,310,423
Loans 90 Days or More Past Due and Still Accruing Interest	580	537	347
Nonaccrual Loans	6,998	6,899	6,283
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	6,187	5,205	6,718
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	995	2,881	1,782
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	4,976	5,382	4,208
Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	702	623	1,205
Current Loans	99,208	98,888	88,671
Loans and Leases Receivable, Gross	99,910	99,511	89,876
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	409	473	182
Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	370	124	597
Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	48	154	579
Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	284	345	29
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	2,093	2,271	3,403
Current Loans	337,194	337,841	333,464
Loans and Leases Receivable, Gross	339,287	340,112	336,867
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	2,070	2,071	2,042
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	255	432	1,381
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	0	7	237
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,838	1,832	1,785
Consumer Loans Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	3,932	5,598	3,392
Current Loans	436,970	431,443	405,012
Loans and Leases Receivable, Gross	440,902	437,041	408,404
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	337	415	372
Consumer Loans Financing [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	3,357	4,167	2,714
Consumer Loans Financing [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	428	1,225	528
Consumer Loans Financing [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	147	206	150
Residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	5,431	4,976	4,708
Current Loans	549,264	531,628	470,568
Loans and Leases Receivable, Gross	554,695	536,604	475,276
Loans 90 Days or More Past Due and Still Accruing Interest	580	537	347
Nonaccrual Loans	4,182	3,940	3,687
Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	2,205	482	2,026
Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	519	1,495	438
Residential [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	$ 2,707	$ 2,999	$ 2,244