Loans Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 537,959	$ 542,323	$ 511,682
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	17,831	1,518	3,582
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,136	28,849	38,894
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	807	807	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,407,293	1,373,752	1,253,388
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,011	3,727	3,259
Commercial | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	107,838	124,961	109,416
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	17,220	1,341	1,349
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,615	2,947	8,077
Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Commercial Real Estate Portfolio Segment | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	430,121	417,362	402,266
Commercial Real Estate Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	611	177	2,233
Commercial Real Estate Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	23,521	25,902	30,817
Commercial Real Estate Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	807	807	0
Consumer Loans Financing | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	626,198	602,168	551,307
Consumer Loans Financing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	441	659	656
Residential | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	781,095	771,584	702,081
Residential | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,570	$ 3,068	$ 2,603