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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 5,267	$ 5,247	$ 5,373	$ 4,935	$ 4,935
Charge-offs	(50)	(47)	(1,139)	(277)
Recoveries	2	3	75	15
Provisions	375	100	1,285	630
Ending balance	5,594	5,303	5,594	5,303	5,373
Ending balance: individually evaluated for impairment	95		95		334
Ending balance: collectively evaluated for impairment	5,499		5,499		5,039
Ending balance: Loans receivables	819,753		819,753		817,529
Ending Balance: individually evaluated for impairment	7,624		7,624		6,919
Ending Balance: collectively evaluated for impairment	810,977		810,977		808,925
Reserve for unfunded loan commitments included in other liabilities			309	199	345
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	1,152		1,152		1,685
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	245	314	349	216	216
Charge-offs				(206)
Recoveries		2	2	10
Provisions	1	87	(105)	383
Ending balance	246	403	246	403	349
Ending balance: individually evaluated for impairment	45		45		143
Ending balance: collectively evaluated for impairment	201		201		206
Ending balance: Loans receivables	88,249		88,249		87,581
Ending Balance: individually evaluated for impairment	2,059		2,059		1,760
Ending Balance: collectively evaluated for impairment	86,179		86,179		85,810
Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	11		11		11
Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,634	2,370	2,531	2,375	2,375
Charge-offs	(36)	(39)	(519)	(39)
Recoveries			50
Provisions	200	141	736	136
Ending balance	2,798	2,472	2,798	2,472	2,531
Ending balance: individually evaluated for impairment	22		22
Ending balance: collectively evaluated for impairment	2,776		2,776		2,531
Ending balance: Loans receivables	461,012		461,012		465,486
Ending Balance: individually evaluated for impairment	2,688		2,688		2,919
Ending Balance: collectively evaluated for impairment	457,183		457,183		460,893
Reserve for unfunded loan commitments included in other liabilities			3	3	4
Commercial Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending balance: Loans receivables	1,141		1,141		1,674
Commercial Term [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	625	891	709	989	989
Charge-offs	(14)	(8)	(610)	(32)
Recoveries	1		20	1
Provisions	36	(90)	529	(165)
Ending balance	648	793	648	793	709
Ending balance: individually evaluated for impairment					97
Ending balance: collectively evaluated for impairment	648		648		612
Ending balance: Loans receivables	120,786		120,786		123,175
Ending Balance: individually evaluated for impairment	1,506		1,506		198
Ending Balance: collectively evaluated for impairment	119,280		119,280		122,977
Reserve for unfunded loan commitments included in other liabilities			150	119	135
Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,208	866	969	569	569
Charge-offs
Recoveries				1
Provisions	(102)	7	137	303
Ending balance	1,106	873	1,106	873	969
Ending balance: individually evaluated for impairment					89
Ending balance: collectively evaluated for impairment	1,106		1,106		880
Ending balance: Loans receivables	84,428		84,428		72,755
Ending Balance: individually evaluated for impairment	447		447		1,242
Ending Balance: collectively evaluated for impairment	83,981		83,981		71,513
Reserve for unfunded loan commitments included in other liabilities			139	64	190
Leases Financing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs
Recoveries		1	1	2
Provisions		(1)	(1)	(2)
Consumer: Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	189	191	196	195	195
Charge-offs
Provisions	(3)	11	(10)	7
Ending balance	186	202	186	202	196
Ending balance: collectively evaluated for impairment	186		186		196
Ending balance: Loans receivables	59,433		59,433		62,560
Ending Balance: individually evaluated for impairment	616		616		544
Ending Balance: collectively evaluated for impairment	58,817		58,817		62,016
Reserve for unfunded loan commitments included in other liabilities			17	13	16
Consumer: Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	84	64	61	64	64
Charge-offs			(10)
Recoveries	1		2	1
Provisions	(4)	(2)	28	(3)
Ending balance	81	62	81	62	61
Ending balance: individually evaluated for impairment	28		28		5
Ending balance: collectively evaluated for impairment	53		53		56
Ending balance: Loans receivables	5,845		5,845		5,972
Ending Balance: individually evaluated for impairment	308		308		256
Ending Balance: collectively evaluated for impairment	5,537		5,537		5,716
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	282	551	558	527	527
Charge-offs
Provisions	247	(53)	(29)	(29)
Ending balance	529	$ 498	529	$ 498	558
Ending balance: collectively evaluated for impairment	$ 529		$ 529		$ 558