Loans Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 532,811	$ 492,629	$ 473,742
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,683	8,367	11,719
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	32,575	35,805	38,802
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,306,050	1,212,103	1,144,765
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,513	4,364	3,462
Commercial | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	120,388	95,722	96,703
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,269	1,359	1,290
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,602	8,074	8,658
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	412,423	396,907	377,039
Commercial Real Estate Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,414	7,008	10,429
Commercial Real Estate Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	27,973	27,731	30,144
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	578,317	536,614	508,014
Consumer Loans Financing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	437	747	524
Residential | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	727,733	675,489	636,751
Residential | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 4,076	$ 3,617	$ 2,938