Loans Loan Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 492,629	$ 454,261
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,367	5,971
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	35,805	27,294
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,212,103	1,082,595
Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	4,364	3,831
Commercial [Member] | Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	95,722	93,607
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,359	1,070
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	8,074	7,910
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Commercial Real Estate [Member] | Satisfactory [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	396,907	360,654
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	7,008	4,901
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	27,731	19,384
Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	0
Other Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	536,614	464,074
Other Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	747	449
Residential Portfolio Segment [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	675,489	618,521
Residential Portfolio Segment [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 3,617	$ 3,382