Loans - Schedule of Allowance for Loan Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 14,148	$ 14,636	$ 14,194	$ 14,747
Charge-offs	(102)	(165)	(272)	(460)
Recoveries	59	17	183	201
Provisions	0	0	0	0
Allowance for Loan Losses, Ending Balance	14,105	14,488	14,105	14,488
Allowance for Loan Losses, Ending Balance	14,148	14,636	14,194	14,747	$ 14,105	$ 14,194	$ 14,488
Allowance for loan losses: Ending balance: individually evaluated for impairment					1,192	932	167
Allowance for loan losses: Ending balance: collectively evaluated for impairment					12,913	13,262	14,321
Total Loans Receivable					1,236,370	907,910	872,023
Loans receivables: Ending balance: individually evaluated for impairment					10,634	11,945	10,350
Loans Receivable: Ending balance: collectively evaluated for impairment					1,225,736	895,965	861,673
Commercial and Industrial
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,246	2,557	3,055	2,508
Charge-offs	(60)	(131)	(129)	(221)
Recoveries	8	5	17	44
Provisions	73	(80)	324	20
Allowance for Loan Losses, Ending Balance	3,267	2,351	3,267	2,351
Allowance for Loan Losses, Ending Balance	3,246	2,557	3,055	2,508	3,267	3,055	2,351
Allowance for loan losses: Ending balance: individually evaluated for impairment					698	599	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					2,569	2,456	2,351
Total Loans Receivable					169,037	140,344	122,926
Loans receivables: Ending balance: individually evaluated for impairment					1,743	2,126	1,249
Loans Receivable: Ending balance: collectively evaluated for impairment					167,294	138,218	121,677
Commercial Real Estate
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	5,210	5,433	4,968	5,216
Charge-offs	0	0	0	0
Recoveries	0	0	61	0
Provisions	195	(60)	376	157
Allowance for Loan Losses, Ending Balance	5,405	5,373	5,405	5,373
Allowance for Loan Losses, Ending Balance	5,210	5,433	4,968	5,216	5,405	4,968	5,373
Allowance for loan losses: Ending balance: individually evaluated for impairment					117	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					5,288	4,968	5,373
Total Loans Receivable					483,673	318,980	309,161
Loans receivables: Ending balance: individually evaluated for impairment					8,413	8,764	8,042
Loans Receivable: Ending balance: collectively evaluated for impairment					475,260	310,216	301,119
Commercial Real Estate Construction
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	135	134	147	112
Charge-offs	0	0	0	(135)
Recoveries	40	0	40	132
Provisions	(31)	11	(43)	36
Allowance for Loan Losses, Ending Balance	144	145	144	145
Allowance for Loan Losses, Ending Balance	135	134	147	112	144	147	145
Allowance for loan losses: Ending balance: individually evaluated for impairment					0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					144	147	145
Total Loans Receivable					39,779	15,271	13,243
Loans receivables: Ending balance: individually evaluated for impairment					0	300	300
Loans Receivable: Ending balance: collectively evaluated for impairment					39,779	14,971	12,943
Residential Mortgage
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,368	3,311	3,478	3,349
Charge-offs	(15)	(6)	(32)	(45)
Recoveries	10	8	52	14
Provisions	(101)	(46)	(236)	(51)
Allowance for Loan Losses, Ending Balance	3,262	3,267	3,262	3,267
Allowance for Loan Losses, Ending Balance	3,368	3,311	3,478	3,349	3,262	3,478	3,267
Allowance for loan losses: Ending balance: individually evaluated for impairment					377	333	167
Allowance for loan losses: Ending balance: collectively evaluated for impairment					2,885	3,145	3,100
Total Loans Receivable					421,732	348,539	346,422
Loans receivables: Ending balance: individually evaluated for impairment					478	755	759
Loans Receivable: Ending balance: collectively evaluated for impairment					421,254	347,784	345,663
Home Equity Lines of Credit
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	607	607	648	619
Charge-offs	(9)	0	(9)	(9)
Recoveries	0	0	0	0
Provisions	29	2	(12)	(1)
Allowance for Loan Losses, Ending Balance	627	609	627	609
Allowance for Loan Losses, Ending Balance	607	607	648	619	627	648	609
Allowance for loan losses: Ending balance: individually evaluated for impairment					0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					627	648	609
Total Loans Receivable					105,113	70,072	65,689
Loans receivables: Ending balance: individually evaluated for impairment					0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment					105,113	70,072	65,689
Consumer
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	815	952	923	1,083
Charge-offs	(18)	(28)	(102)	(50)
Recoveries	1	4	13	11
Provisions	12	(11)	(24)	(127)
Allowance for Loan Losses, Ending Balance	810	917	810	917
Allowance for Loan Losses, Ending Balance	815	952	923	1,083	810	923	917
Allowance for loan losses: Ending balance: individually evaluated for impairment					0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					810	923	917
Total Loans Receivable					17,036	14,704	14,582
Loans receivables: Ending balance: individually evaluated for impairment					0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment					17,036	14,704	14,582
Unallocated
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	767	1,642	975	1,860
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provisions	(177)	184	(385)	(34)
Allowance for Loan Losses, Ending Balance	590	1,826	590	1,826
Allowance for Loan Losses, Ending Balance	$ 767	$ 1,642	$ 975	$ 1,860	590	975	1,826
Allowance for loan losses: Ending balance: individually evaluated for impairment					0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment					590	975	1,826
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