Loans - Schedule of Allowance for Loan Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 13,976	$ 14,194
Charge-offs	(826)	(129)
Recoveries	17	80
Provisions	250	0
Allowance for Loan Losses, Ending Balance	13,417	14,145
Allowance for Loan Losses, Ending Balance	13,976	14,194	$ 13,417	$ 13,976	$ 14,145
Allowance for loan losses: Ending balance: individually evaluated for impairment			517	1,229	928
Allowance for loan losses: Ending balance: collectively evaluated for impairment			12,900	12,747	13,217
Total Loans Receivable			1,237,754	1,244,170	952,476
Loans receivables: Ending balance: individually evaluated for impairment			8,456	10,337	11,431
Loans Receivable: Ending balance: collectively evaluated for impairment			1,229,298	1,233,833	941,045
Commercial and Industrial
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,219	3,055
Charge-offs	(389)	(40)
Recoveries	7	6
Provisions	137	231
Allowance for Loan Losses, Ending Balance	2,974	3,252
Allowance for Loan Losses, Ending Balance	3,219	3,055	2,974	3,219	3,252
Allowance for loan losses: Ending balance: individually evaluated for impairment			517	792	595
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,457	2,427	2,657
Total Loans Receivable			162,463	165,829	162,997
Loans receivables: Ending balance: individually evaluated for impairment			1,046	1,499	2,068
Loans Receivable: Ending balance: collectively evaluated for impairment			161,417	164,330	160,929
Commercial Real Estate
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,228	4,968
Charge-offs	(33)	0
Recoveries	0	61
Provisions	260	(68)
Allowance for Loan Losses, Ending Balance	5,455	4,961
Allowance for Loan Losses, Ending Balance	5,228	4,968	5,455	5,228	4,961
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	60	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			5,455	5,168	4,961
Total Loans Receivable			509,747	492,759	335,640
Loans receivables: Ending balance: individually evaluated for impairment			7,309	8,360	8,617
Loans Receivable: Ending balance: collectively evaluated for impairment			502,438	484,399	327,023
Commercial Real Estate Construction
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	126	147
Charge-offs	0	0
Recoveries	0	0
Provisions	9	2
Allowance for Loan Losses, Ending Balance	135	149
Allowance for Loan Losses, Ending Balance	126	147	135	126	149
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			135	126	149
Total Loans Receivable			21,073	35,560	18,311
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			21,073	35,560	18,311
Residential Mortgage
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,226	3,478
Charge-offs	(383)	(17)
Recoveries	10	10
Provisions	83	(167)
Allowance for Loan Losses, Ending Balance	2,936	3,304
Allowance for Loan Losses, Ending Balance	3,226	3,478	2,936	3,226	3,304
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	377	333
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,936	2,849	2,971
Total Loans Receivable			423,944	425,893	349,716
Loans receivables: Ending balance: individually evaluated for impairment			101	478	746
Loans Receivable: Ending balance: collectively evaluated for impairment			423,843	425,415	348,970
Home Equity Lines of Credit
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	612	648
Charge-offs	0	0
Recoveries	0	0
Provisions	(19)	(43)
Allowance for Loan Losses, Ending Balance	593	605
Allowance for Loan Losses, Ending Balance	612	648	593	612	605
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			593	612	605
Total Loans Receivable			104,492	107,792	71,336
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			104,492	107,792	71,336
Consumer
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	749	923
Charge-offs	(21)	(72)
Recoveries	0	3
Provisions	(3)	(15)
Allowance for Loan Losses, Ending Balance	725	839
Allowance for Loan Losses, Ending Balance	749	923	725	749	839
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			725	749	839
Total Loans Receivable			16,035	16,337	14,476
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			16,035	16,337	14,476
Unallocated
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	816	975
Charge-offs	0	0
Recoveries	0	0
Provisions	(217)	60
Allowance for Loan Losses, Ending Balance	599	1,035
Allowance for Loan Losses, Ending Balance	$ 816	$ 975	599	816	1,035
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			599	816	1,035
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