Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016	Dec. 31, 2016		Jun. 30, 2017	Dec. 31, 2016
Allowance for Loan Losses
Balance, beginning of period			$ 12,801	[1]	$ 12,601	$ 12,601
Provision for loan losses	$ 350	$ 50	650		100	250
Charge-offs			(134)		(158)	(326)
Recoveries			315		131	276
Balance, end of period	13,632	12,674	13,632		12,674	12,801	[1]
Reserve for Unfunded Lending Commitments
Balance, beginning of period			203		184	184
Provision for unfunded commitments			4		12	19
Charge-offs			0		0	0
Balance, end of period	207	196	207		196	203
Allowance for Loan Losses
Individually evaluated for impairment								$ 15	$ 23
Collectively evaluated for impairment								13,212	12,429
Total	13,632	$ 12,674	12,801	[1]	12,601	12,601		13,632	12,801	[1]
Loans
Individually evaluated for impairment								3,300	4,844
Collectively evaluated for impairment								1,258,353	1,131,308
Total Loans								1,288,693	1,164,821	[1]
Purchased impaired loans
Allowance for Loan Losses
Balance, beginning of period			349
Balance, end of period	405		405			349
Allowance for Loan Losses
Total	405		349			349		405	349
Loans
Total Loans								27,040	28,669
Commercial
Allowance for Loan Losses
Balance, beginning of period			2,095		2,065	2,065
Provision for loan losses			77			30
Charge-offs			(23)			(40)
Recoveries			212			40
Balance, end of period	2,361		2,361			2,095
Allowance for Loan Losses
Individually evaluated for impairment								5	0
Collectively evaluated for impairment								2,295	2,087
Total	2,361		2,095		2,065	2,065		2,361	2,095
Loans
Individually evaluated for impairment								96	43
Collectively evaluated for impairment								235,899	208,258
Total Loans								236,418	208,717
Commercial | Purchased impaired loans
Allowance for Loan Losses
Balance, beginning of period			8
Balance, end of period	61		61			8
Allowance for Loan Losses
Total	61		8			8		61	8
Loans
Total Loans								423	416
Commercial Real Estate
Allowance for Loan Losses
Balance, beginning of period			7,355		6,930	6,930
Provision for loan losses			754			403
Charge-offs			(1)			(10)
Recoveries			15			32
Balance, end of period	8,123		8,123			7,355
Allowance for Loan Losses
Individually evaluated for impairment								0	0
Collectively evaluated for impairment								8,035	7,248
Total	8,123		7,355		6,930	6,930		8,123	7,355
Loans
Individually evaluated for impairment								1,294	2,186
Collectively evaluated for impairment								707,480	610,462
Total Loans								722,415	625,218
Commercial Real Estate | Purchased impaired loans
Allowance for Loan Losses
Balance, beginning of period			107
Balance, end of period	88		88			107
Allowance for Loan Losses
Total	88		107			107		88	107
Loans
Total Loans								13,641	12,570
Residential Real Estate
Allowance for Loan Losses
Balance, beginning of period			3,303		3,546	3,546
Provision for loan losses			(203)			(224)
Charge-offs			(24)			(87)
Recoveries			22			68
Balance, end of period	3,098		3,098			3,303
Allowance for Loan Losses
Individually evaluated for impairment								10	23
Collectively evaluated for impairment								2,832	3,046
Total	3,098		3,303		3,546	3,546		3,098	3,303
Loans
Individually evaluated for impairment								1,896	2,588
Collectively evaluated for impairment								310,028	307,600
Total Loans								324,885	325,855
Residential Real Estate | Purchased impaired loans
Allowance for Loan Losses
Balance, beginning of period			234
Balance, end of period	256		256			234
Allowance for Loan Losses
Total	256		234			234		256	234
Loans
Total Loans								12,961	15,667
Consumer
Allowance for Loan Losses
Balance, beginning of period			48		60	60
Provision for loan losses			22			41
Charge-offs			(86)			(189)
Recoveries			66			136
Balance, end of period	50		50			48
Allowance for Loan Losses
Individually evaluated for impairment								0	0
Collectively evaluated for impairment								50	48
Total	50		48		$ 60	60		50	48
Loans
Individually evaluated for impairment								14	27
Collectively evaluated for impairment								4,946	4,988
Total Loans								4,975	5,031
Consumer | Purchased impaired loans
Allowance for Loan Losses
Balance, beginning of period			0
Balance, end of period	0		0			0
Allowance for Loan Losses
Total	$ 0		$ 0			$ 0		0	0
Loans
Total Loans								$ 15	$ 16

[1] Derived from audited consolidated financial statements.