Loans - Schedule of Allowance for Loan Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 13,964	$ 13,976
Charge-offs	(132)	(826)
Recoveries	38	17
Provisions	150	250
Allowance for Loan Losses, Ending Balance	14,020	13,417
Allowance for Loan Losses, Ending Balance	13,964	13,976	$ 14,020	$ 13,964	$ 13,417
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	517
Allowance for loan losses: Ending balance: collectively evaluated for impairment			14,020	13,964	12,900
Total Loans Receivable			1,301,335	1,302,465	1,237,754
Loans receivables: Ending balance: individually evaluated for impairment			7,191	7,300	8,456
Loans Receivable: Ending balance: collectively evaluated for impairment			1,294,144	1,295,165	1,229,298
Commercial and Industrial
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,597	3,219
Charge-offs	(31)	(389)
Recoveries	14	7
Provisions	40	137
Allowance for Loan Losses, Ending Balance	2,620	2,974
Allowance for Loan Losses, Ending Balance	2,597	3,219	2,620	2,597	2,974
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	517
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,620	2,597	2,457
Total Loans Receivable			175,309	174,182	162,463
Loans receivables: Ending balance: individually evaluated for impairment			0	0	1,046
Loans Receivable: Ending balance: collectively evaluated for impairment			175,309	174,182	161,417
Commercial Real Estate
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	6,208	5,228
Charge-offs	0	(33)
Recoveries	0	0
Provisions	70	260
Allowance for Loan Losses, Ending Balance	6,278	5,455
Allowance for Loan Losses, Ending Balance	6,208	5,228	6,278	6,208	5,455
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			6,278	6,208	5,455
Total Loans Receivable			544,273	548,923	509,747
Loans receivables: Ending balance: individually evaluated for impairment			6,654	6,763	7,309
Loans Receivable: Ending balance: collectively evaluated for impairment			537,619	542,160	502,438
Commercial Real Estate Construction
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	203	126
Charge-offs	0	0
Recoveries	0	0
Provisions	38	9
Allowance for Loan Losses, Ending Balance	241	135
Allowance for Loan Losses, Ending Balance	203	126	241	203	135
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			241	203	135
Total Loans Receivable			29,726	20,298	21,073
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			29,726	20,298	21,073
Residential Mortgage
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	2,814	3,226
Charge-offs	(6)	(383)
Recoveries	1	10
Provisions	(72)	83
Allowance for Loan Losses, Ending Balance	2,737	2,936
Allowance for Loan Losses, Ending Balance	2,814	3,226	2,737	2,814	2,936
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,737	2,814	2,936
Total Loans Receivable			426,426	434,299	423,944
Loans receivables: Ending balance: individually evaluated for impairment			537	537	101
Loans Receivable: Ending balance: collectively evaluated for impairment			425,889	433,762	423,843
Home Equity Lines of Credit
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	611	612
Charge-offs	(51)	0
Recoveries	0	0
Provisions	56	(19)
Allowance for Loan Losses, Ending Balance	616	593
Allowance for Loan Losses, Ending Balance	611	612	616	611	593
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			616	611	593
Total Loans Receivable			111,333	110,363	104,492
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			111,333	110,363	104,492
Consumer
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	692	749
Charge-offs	(44)	(21)
Recoveries	23	0
Provisions	26	(3)
Allowance for Loan Losses, Ending Balance	697	725
Allowance for Loan Losses, Ending Balance	692	749	697	692	725
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			697	692	725
Total Loans Receivable			14,268	14,400	16,035
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			14,268	14,400	16,035
Unallocated
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	839	816
Charge-offs	0	0
Recoveries	0	0
Provisions	(8)	(217)
Allowance for Loan Losses, Ending Balance	831	599
Allowance for Loan Losses, Ending Balance	$ 839	$ 816	831	839	599
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			831	839	599
Total Loans Receivable			0	0	0
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			$ 0	$ 0	$ 0