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Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Ending Balance Attributable to Loans
Individually evaluated for impairment	$ 763	$ 737
Collectively evaluated for impairment	20,197	19,699
Ending Balance	20,960	20,436	$ 20,242	$ 19,909
Loans
Individually evaluated for impairment	10,455	10,516
Collectively evaluated for impairment	1,979,291	1,949,197
Total	1,991,205	1,961,208
Commercial Portfolio Segment [Member]
Ending Balance Attributable to Loans
Individually evaluated for impairment	763	737
Collectively evaluated for impairment	8,476	9,111
Ending Balance	9,239	9,848	10,152	10,281
Loans
Individually evaluated for impairment	6,203	6,101
Collectively evaluated for impairment	1,180,108	1,166,227
Total	1,187,770	1,173,823
Residential Portfolio Segment [Member]
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,492	1,313
Ending Balance	1,492	1,313	1,389	1,455
Loans
Individually evaluated for impairment	4,252	4,415
Collectively evaluated for impairment	449,510	440,497
Total	453,762	444,912
Consumer Portfolio Segment [Member]
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	7,562	7,481
Ending Balance	7,562	7,481	6,781	6,709
Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	349,673	342,473
Total	349,673	342,473
Unallocated
Ending Balance Attributable to Loans
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,667	1,794
Ending Balance	2,667	1,794	$ 1,920	$ 1,464
Financial Asset Acquired with Credit Deterioration [Member]
Ending Balance Attributable to Loans
Financing Receivable, Allowance for Credit Losses	0	0
Loans
Financing Receivable, Net	1,459	1,495
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member]
Ending Balance Attributable to Loans
Financing Receivable, Allowance for Credit Losses	0	0
Loans
Financing Receivable, Net	1,459	1,495
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member]
Ending Balance Attributable to Loans
Financing Receivable, Allowance for Credit Losses	0	0
Loans
Financing Receivable, Net	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member]
Ending Balance Attributable to Loans
Financing Receivable, Allowance for Credit Losses	0	0
Loans
Financing Receivable, Net	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated
Ending Balance Attributable to Loans
Financing Receivable, Allowance for Credit Losses	$ 0	$ 0

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