Loans Categories and Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	$ 5,879	$ 8,124
Loans Past Due 60-89 Days	4,093	1,743
Loans Past Due 90 or more Days	3,205	2,841
Total Loans Past Due	13,177	12,708
Current Loans	2,183,038	1,938,062
Total Loans	2,196,215	1,950,770
Loans 90 or More Days Past Due and Still Accruing Interest	1,225	319
Nonaccrual Loans	4,159	5,526
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	121	139
Loans Past Due 60-89 Days	49	19
Loans Past Due 90 or more Days	0	99
Total Loans Past Due	170	257
Current Loans	136,720	128,992
Total Loans	136,890	129,249
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	403	588
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	108	0
Loans Past Due 60-89 Days	0	0
Loans Past Due 90 or more Days	789	807
Total Loans Past Due	897	807
Current Loans	483,665	443,441
Total Loans	484,562	444,248
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	789	1,530
Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	5,369	5,891
Loans Past Due 60-89 Days	2,136	1,215
Loans Past Due 90 or more Days	572	513
Total Loans Past Due	8,077	7,619
Current Loans	711,433	595,208
Total Loans	719,510	602,827
Loans 90 or More Days Past Due and Still Accruing Interest	144	6
Nonaccrual Loans	658	653
Residential Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans Past Due 30-59 Days	281	2,094
Loans Past Due 60-89 Days	1,908	509
Loans Past Due 90 or more Days	1,844	1,422
Total Loans Past Due	4,033	4,025
Current Loans	851,220	770,421
Total Loans	855,253	774,446
Loans 90 or More Days Past Due and Still Accruing Interest	1,081	313
Nonaccrual Loans	$ 2,309	$ 2,755