Loans Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 511,682	$ 492,629	$ 467,928
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,582	8,367	16,092
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	38,894	35,805	25,902
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,253,388	1,212,103	1,109,080
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	3,259	4,364	3,726
Commercial | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	109,416	95,722	97,189
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,349	1,359	994
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,077	8,074	7,894
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	402,266	396,907	370,739
Commercial Real Estate Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,233	7,008	15,098
Commercial Real Estate Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	30,817	27,731	18,008
Commercial Real Estate Portfolio Segment | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Consumer Loans Financing | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	551,307	536,614	488,950
Consumer Loans Financing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	656	747	559
Residential | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	702,081	675,489	620,130
Residential | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 2,603	$ 3,617	$ 3,167