Loans Loan Categories and Past Due Loans(Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	$ 12,139	$ 13,468	$ 11,994
Current Loans	1,524,786	1,399,800	1,369,446
Loans and Leases Receivable, Gross	1,536,925	1,413,268	1,381,440
Loans 90 Days or More Past Due and Still Accruing Interest	963	537	571
Nonaccrual Loans	7,791	6,899	7,048
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	4,732	5,205	3,460
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,960	2,881	2,887
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	5,447	5,382	5,647
Commercial [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	486	623	804
Current Loans	102,403	98,888	96,042
Loans and Leases Receivable, Gross	102,889	99,511	96,846
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	328
Nonaccrual Loans	466	473	241
Commercial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	47	124	109
Commercial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	68	154	210
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	371	345	485
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	1,817	2,271	2,064
Current Loans	371,855	337,841	338,544
Loans and Leases Receivable, Gross	373,672	340,112	340,608
Loans 90 Days or More Past Due and Still Accruing Interest	0	0	0
Nonaccrual Loans	2,752	2,071	2,073
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	0	432	0
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	232
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	1,817	1,832	1,832
Consumer Loans Financing [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	5,842	5,598	4,294
Current Loans	453,078	431,443	422,672
Loans and Leases Receivable, Gross	458,920	437,041	426,966
Loans 90 Days or More Past Due and Still Accruing Interest	1	0	0
Nonaccrual Loans	439	415	438
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	4,258	4,167	2,962
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	1,234	1,225	1,066
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	350	206	266
Residential [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	3,994	4,976	4,832
Current Loans	597,450	531,628	512,188
Loans and Leases Receivable, Gross	601,444	536,604	517,020
Loans 90 Days or More Past Due and Still Accruing Interest	962	537	243
Nonaccrual Loans	4,134	3,940	4,296
Residential [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	427	482	389
Residential [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing Receivable, Recorded Investment, Past Due	658	1,495	1,379
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	$ 2,909	$ 2,999	$ 3,064