Loans Categories and Past Due Loans(Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	$ 8,124	$ 8,194
Loans Past Due 60-89 Days	1,743	1,069
Loans Past Due 90 or more Days	2,841	2,636
Total Loans Past Due	12,708	11,899
Current Loans	1,938,062	1,741,369
Total Loans	1,950,770	1,753,268
Loans 90 or More Days Past Due and Still Accruing Interest	319	1,201
Nonaccrual Loans	5,526	4,193
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	139	112
Loans Past Due 60-89 Days	19	29
Loans Past Due 90 or more Days	99	148
Total Loans Past Due	257	289
Current Loans	128,992	104,866
Total Loans	129,249	105,155
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	588	155
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	0	121
Loans Past Due 60-89 Days	0	0
Loans Past Due 90 or more Days	807	0
Total Loans Past Due	807	121
Current Loans	443,441	431,525
Total Loans	444,248	431,646
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	1,530	875
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	5,891	5,593
Loans Past Due 60-89 Days	1,215	898
Loans Past Due 90 or more Days	513	513
Total Loans Past Due	7,619	7,004
Current Loans	595,208	530,357
Total Loans	602,827	537,361
Loans 90 or More Days Past Due and Still Accruing Interest	6	158
Nonaccrual Loans	653	589
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	2,094	2,368
Loans Past Due 60-89 Days	509	142
Loans Past Due 90 or more Days	1,422	1,975
Total Loans Past Due	4,025	4,485
Current Loans	770,421	674,621
Total Loans	774,446	679,106
Loans 90 or More Days Past Due and Still Accruing Interest	313	1,043
Nonaccrual Loans	$ 2,755	$ 2,574