Loans Categories and Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Loans receivable, held-for-sale	$ 150	$ 215
Total Loans Past Due	13,606	13,177
Current Loans	2,372,514	2,183,038
Total Loans	2,386,120	2,196,215
Loans 90 or More Days Past Due and Still Accruing Interest	253	1,225
Nonaccrual Loans	4,005	4,159
Loans Past Due 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	5,972	5,879
Loans Past Due 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	5,035	4,093
Loans Past Due 90 or More Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,599	3,205
Commercial
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	213	170
Current Loans	150,447	136,720
Total Loans	150,660	136,890
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	81	403
Commercial | Loans Past Due 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	150	121
Commercial | Loans Past Due 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	42	49
Commercial | Loans Past Due 90 or More Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	21	0
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	592	897
Current Loans	509,949	483,665
Total Loans	510,541	484,562
Loans 90 or More Days Past Due and Still Accruing Interest	0	0
Nonaccrual Loans	326	789
Commercial Real Estate | Loans Past Due 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	108
Commercial Real Estate | Loans Past Due 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	266	0
Commercial Real Estate | Loans Past Due 90 or More Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	326	789
Other Consumer
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	8,815	8,077
Current Loans	802,383	711,433
Total Loans	811,198	719,510
Loans 90 or More Days Past Due and Still Accruing Interest	0	144
Nonaccrual Loans	663	658
Other Consumer | Loans Past Due 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	5,670	5,369
Other Consumer | Loans Past Due 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,700	2,136
Other Consumer | Loans Past Due 90 or More Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	445	572
Residential Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	3,986	4,033
Current Loans	909,735	851,220
Total Loans	913,721	855,253
Loans 90 or More Days Past Due and Still Accruing Interest	253	1,081
Nonaccrual Loans	2,935	2,309
Residential Portfolio Segment | Loans Past Due 30-59 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	152	281
Residential Portfolio Segment | Loans Past Due 60-89 Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,027	1,908
Residential Portfolio Segment | Loans Past Due 90 or More Days
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	$ 1,807	$ 1,844