Allowance for Credit Losses (Allowance For Credit Losses And Recorded Investments In Loans Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 6,188	$ 5,267	$ 5,843	$ 5,373	$ 5,373
Charge-offs	(38)	(50)	(472)	(1,139)
Recoveries	309	2	338	75
Provisions	100	375	850	1,285
Ending balance	6,559	5,594	6,559	5,594	5,843
Ending balance: individually evaluated for impairment	341		341		157
Ending balance: collectively evaluated for impairment	6,218		6,218		5,686
Ending balance: Loans receivables	908,293		908,293		845,897
Ending Balance: individually evaluated for impairment	8,251		8,251		8,187
Ending Balance: collectively evaluated for impairment	899,521		899,521		836,767
Reserve for unfunded loan commitments included in other liabilities			386	309	348
Loans Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	521		521		943
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	207	245	221	349	349
Charge-offs			(137)
Recoveries	308		334	2
Provisions	(352)	1	(255)	(105)
Ending balance	163	246	163	246	221
Ending balance: individually evaluated for impairment	1		1		3
Ending balance: collectively evaluated for impairment	162		162		218
Ending balance: Loans receivables	103,093		103,093		93,959
Ending Balance: individually evaluated for impairment	1,647		1,647		1,908
Ending Balance: collectively evaluated for impairment	101,446		101,446		92,044
Residential Mortgage [Member] | Loans Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables					7
Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,076	2,634	2,856	2,531	2,531
Charge-offs		(36)	(184)	(519)
Recoveries				50
Provisions	213	200	617	736
Ending balance	3,289	2,798	3,289	2,798	2,856
Ending balance: individually evaluated for impairment	18		18		19
Ending balance: collectively evaluated for impairment	3,271		3,271		2,837
Ending balance: Loans receivables	524,672		524,672		484,868
Ending Balance: individually evaluated for impairment	2,528		2,528		2,828
Ending Balance: collectively evaluated for impairment	521,623		521,623		481,104
Reserve for unfunded loan commitments included in other liabilities			3	3	2
Commercial Mortgage [Member] | Loans Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	521		521		936
Commercial Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	889	625	845	709	709
Charge-offs	(15)	(14)	(79)	(610)
Recoveries		1	2	20
Provisions	113	36	219	529
Ending balance	987	648	987	648	845
Ending balance: individually evaluated for impairment	319		319		123
Ending balance: collectively evaluated for impairment	668		668		722
Ending balance: Loans receivables	140,810		140,810		129,535
Ending Balance: individually evaluated for impairment	2,624		2,624		2,080
Ending Balance: collectively evaluated for impairment	138,186		138,186		127,455
Reserve for unfunded loan commitments included in other liabilities			176	150	155
Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,355	1,208	1,128	969	969
Charge-offs
Provisions	(287)	(102)	(60)	137
Ending balance	1,068	1,106	1,068	1,106	1,128
Ending balance: collectively evaluated for impairment	1,068		1,068		1,128
Ending balance: Loans receivables	81,297		81,297		75,014
Ending Balance: individually evaluated for impairment	479		479		514
Ending Balance: collectively evaluated for impairment	80,818		80,818		74,500
Reserve for unfunded loan commitments included in other liabilities			186	139	173
Leases Financing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs
Recoveries				1
Provisions				(1)
Consumer: Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	196	189	183	196	196
Charge-offs
Provisions		(3)	13	(10)
Ending balance	196	186	196	186	183
Ending balance: collectively evaluated for impairment	196		196		183
Ending balance: Loans receivables	53,210		53,210		56,844
Ending Balance: individually evaluated for impairment	772		772		612
Ending Balance: collectively evaluated for impairment	52,438		52,438		56,232
Reserve for unfunded loan commitments included in other liabilities			21	17	18
Consumer: Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	49	84	63	61	61
Charge-offs	(23)		(72)	(10)
Recoveries	1	1	2	2
Provisions	21	(4)	55	28
Ending balance	48	81	48	81	63
Ending balance: individually evaluated for impairment	3		3		12
Ending balance: collectively evaluated for impairment	45		45		51
Ending balance: Loans receivables	5,211		5,211		5,677
Ending Balance: individually evaluated for impairment	201		201		245
Ending Balance: collectively evaluated for impairment	5,010		5,010		5,432
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	416	282	547	558	558
Charge-offs
Provisions	392	247	261	(29)
Ending balance	808	$ 529	808	$ 529	547
Ending balance: collectively evaluated for impairment	$ 808		$ 808		$ 547