Loans Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 547,581	$ 542,323	$ 532,811
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,948	1,518	2,683
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	28,938	28,849	32,575
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	807	807	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	1,472,304	1,373,752	1,306,050
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,284	3,727	4,513
Commercial | Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	110,911	124,961	120,388
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	5,948	1,341	1,269
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	2,023	2,947	4,602
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	436,670	417,362	412,423
Commercial Real Estate Portfolio Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	0	177	1,414
Commercial Real Estate Portfolio Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	26,915	25,902	27,973
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	661,449	602,168	578,317
Consumer Loans Financing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	459	659	437
Residential | Performing
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	810,855	771,584	727,733
Residential | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Net	$ 1,825	$ 3,068	$ 4,076