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Allowance for Loan Losses - Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 10,729				$ 10,138	$ 10,729	$ 10,138	$ 9,916
Chargeoffs									1,273	1,618	1,721
Recoveries									276	209	343
Provision for loan losses	$ 167	$ 333	$ 500	500	$ 250	$ 750	$ 500	500	1,500	2,000	1,600
Ending balance	11,232				10,729				11,232	10,729	10,138
Ending balance specifically evaluated for impairment	2,308				1,812				2,308	1,812	974
Ending balance collectively evaluated for impairment	8,924				8,917				8,924	8,917	9,164
Loans	1,238,283				1,164,139				1,238,283	1,164,139	1,071,526
Ending balance specifically evaluated for impairment	31,751				31,392				31,751	31,392	27,583
Ending balance collectively evaluated for impairment	1,206,532				1,132,747				1,206,532	1,132,747	1,043,943
Commercial | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,872				3,988	3,872	3,988	3,120
Chargeoffs									168	587	294
Recoveries									52	0	0
Provision for loan losses									(189)	471	1,162
Ending balance	3,567				3,872				3,567	3,872	3,988
Ending balance specifically evaluated for impairment	260				224				260	224	505
Ending balance collectively evaluated for impairment	3,307				3,648				3,307	3,648	3,483
Loans	353,243				323,809				353,243	323,809	302,506
Ending balance specifically evaluated for impairment	9,760				7,790				9,760	7,790	10,021
Ending balance collectively evaluated for impairment	343,483				316,019				343,483	316,019	292,485
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				434				396	434	396	580
Chargeoffs									0	0	75
Recoveries									0	0	8
Provision for loan losses									(179)	38	(117)
Ending balance	255				434				255	434	396
Ending balance specifically evaluated for impairment	0				0				0	0	100
Ending balance collectively evaluated for impairment	255				434				255	434	296
Loans	27,304				38,056				27,304	38,056	25,406
Ending balance specifically evaluated for impairment	721				741				721	741	763
Ending balance collectively evaluated for impairment	26,583				37,315				26,583	37,315	24,643
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,358				1,780	3,358	1,780	1,452
Chargeoffs									423	212	376
Recoveries									40	49	129
Provision for loan losses									566	1,741	575
Ending balance	3,541				3,358				3,541	3,358	1,780
Ending balance specifically evaluated for impairment	1,696				1,309				1,696	1,309	39
Ending balance collectively evaluated for impairment	1,845				2,049				1,845	2,049	1,741
Loans	196,391				181,528				196,391	181,528	150,769
Ending balance specifically evaluated for impairment	9,259				9,918				9,259	9,918	1,743
Ending balance collectively evaluated for impairment	187,132				171,610				187,132	171,610	149,026
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				20				18	20	18	17
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									4	2	1
Ending balance	24				20				24	20	18
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	24				20				24	20	18
Loans	51,128				33,391				51,128	33,391	27,056
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	51,128				33,391				51,128	33,391	27,056
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				36				44	36	44	24
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(2)	(8)	20
Ending balance	34				36				34	36	44
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	34				36				34	36	44
Loans	17,743				17,868				17,743	17,868	18,303
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	17,743				17,868				17,743	17,868	18,303
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,130				1,288	1,130	1,288	1,391
Chargeoffs									213	456	379
Recoveries									64	40	93
Provision for loan losses									254	258	183
Ending balance	1,235				1,130				1,235	1,130	1,288
Ending balance specifically evaluated for impairment	335				255				335	255	304
Ending balance collectively evaluated for impairment	900				875				900	875	984
Loans	469,145				432,661				469,145	432,661	411,469
Ending balance specifically evaluated for impairment	10,904				11,748				10,904	11,748	13,669
Ending balance collectively evaluated for impairment	458,241				420,913				458,241	420,913	397,800
Home Equity LIne of Credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				692				807	692	807	893
Chargeoffs									121	28	147
Recoveries									24	11	5
Provision for loan losses									135	(98)	56
Ending balance	730				692				730	692	807
Ending balance specifically evaluated for impairment	17				24				17	24	26
Ending balance collectively evaluated for impairment	713				668				713	668	781
Loans	98,469				111,302				98,469	111,302	110,907
Ending balance specifically evaluated for impairment	1,092				1,179				1,092	1,179	1,387
Ending balance collectively evaluated for impairment	97,377				110,123				97,377	110,123	109,520
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				545				559	545	559	566
Chargeoffs									348	335	450
Recoveries									96	109	108
Provision for loan losses									337	212	335
Ending balance	630				545				630	545	559
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	630				545				630	545	559
Loans	24,860				25,524				24,860	25,524	25,110
Ending balance specifically evaluated for impairment	15				16				15	16	0
Ending balance collectively evaluated for impairment	24,845				25,508				24,845	25,508	25,110
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 642				$ 1,258	642	1,258	1,873
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									574	(616)	(615)
Ending balance	1,216				642				1,216	642	1,258
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	1,216				642				1,216	642	1,258
Loans	0				0				0	0	0
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	$ 0				$ 0				$ 0	$ 0	$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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