Allowance for Credit Losses (Allowance For Credit Losses And Recorded Investments In Loans Receivables) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 6,145	$ 5,418	$ 5,843	$ 5,373	$ 5,373
Charge-offs	(358)	(740)	(434)	(1,089)
Recoveries	26	4	29	73
Provisions	375	585	750	910
Ending balance	6,188	5,267	6,188	5,267	5,843
Ending balance: individually evaluated for impairment	194		194		157
Ending balance: collectively evaluated for impairment	5,994		5,994		5,686
Ending balance: Loans receivables	885,320		885,320		845,897
Ending Balance: individually evaluated for impairment	8,519		8,519		8,187
Ending Balance: collectively evaluated for impairment	876,279		876,279		836,767
Reserve for unfunded loan commitments included in other liabilities			408	340	348
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	522		522		943
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	226	247	221	349	349
Charge-offs	(103)		(137)
Recoveries	25		26	2
Provisions	59	(2)	97	(106)
Ending balance	207	245	207	245	221
Ending balance: individually evaluated for impairment	1		1		3
Ending balance: collectively evaluated for impairment	206		206		218
Ending balance: Loans receivables	98,858		98,858		93,959
Ending Balance: individually evaluated for impairment	1,996		1,996		1,908
Ending Balance: collectively evaluated for impairment	96,862		96,862		92,044
Residential Mortgage [Member] | 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	2,987	2,597	2,856	2,531	2,531
Charge-offs	(171)	(249)	(184)	(483)
Recoveries				50
Provisions	260	286	404	536
Ending balance	3,076	2,634	3,076	2,634	2,856
Ending balance: individually evaluated for impairment	19		19		19
Ending balance: collectively evaluated for impairment	3,057		3,057		2,837
Ending balance: Loans receivables	516,772		516,772		484,868
Ending Balance: individually evaluated for impairment	2,565		2,565		2,828
Ending Balance: collectively evaluated for impairment	513,685		513,685		481,104
Reserve for unfunded loan commitments included in other liabilities			3	9	2
Commercial Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	522		522		936
Commercial Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	904	774	845	709	709
Charge-offs	(47)	(491)	(64)	(596)
Recoveries		3	2	19
Provisions	32	339	106	493
Ending balance	889	625	889	625	845
Ending balance: individually evaluated for impairment	171		171		123
Ending balance: collectively evaluated for impairment	718		718		722
Ending balance: Loans receivables	130,565		130,565		129,535
Ending Balance: individually evaluated for impairment	2,583		2,583		2,080
Ending Balance: collectively evaluated for impairment	127,982		127,982		127,455
Reserve for unfunded loan commitments included in other liabilities			183	140	155
Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,219	1,059	1,128	969	969
Charge-offs
Provisions	136	149	227	239
Ending balance	1,355	1,208	1,355	1,208	1,128
Ending balance: collectively evaluated for impairment	1,355		1,355		1,128
Ending balance: Loans receivables	80,594		80,594		75,014
Ending Balance: individually evaluated for impairment	488		488		514
Ending Balance: collectively evaluated for impairment	80,106		80,106		74,500
Reserve for unfunded loan commitments included in other liabilities			201	173	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	176	196	183	196	196
Charge-offs
Provisions	20	(7)	13	(7)
Ending balance	196	189	196	189	183
Ending balance: collectively evaluated for impairment	196		196		183
Ending balance: Loans receivables	53,173		53,173		56,844
Ending Balance: individually evaluated for impairment	641		641		612
Ending Balance: collectively evaluated for impairment	52,532		52,532		56,232
Reserve for unfunded loan commitments included in other liabilities			21	18	18
Consumer: Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	55	63	63	61	61
Charge-offs	(37)		(49)	(10)
Recoveries	1	1	1	1
Provisions	30	20	34	32
Ending balance	49	84	49	84	63
Ending balance: individually evaluated for impairment	3		3		12
Ending balance: collectively evaluated for impairment	46		46		51
Ending balance: Loans receivables	5,358		5,358		5,677
Ending Balance: individually evaluated for impairment	246		246		245
Ending Balance: collectively evaluated for impairment	5,112		5,112		5,432
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	578	482	547	558	558
Charge-offs
Provisions	(162)	(200)	(131)	(276)
Ending balance	416	$ 282	416	$ 282	547
Ending balance: collectively evaluated for impairment	$ 416		$ 416		$ 547