Allowance For Loan Losses (Impaired Loans By Class) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016
Unpaid Principal Balance [Abstract]
Total:	$ 11,529	$ 11,529	$ 14,341
Recorded Investment [Abstract]
Total:	10,615	10,615	13,400
Related Allowance	268	268	385
Average Recorded Investment [Abstract]
Total:	10,700	10,770	13,719
Interest Income Recognized [Abstract]
Total:	67	216	415
Consumer Installment
Unpaid Principal Balance [Abstract]
Total:	3	3	8
Recorded Investment [Abstract]
Total:	3	3	8
Related Allowance	0	0	0
Average Recorded Investment [Abstract]
Total:		4	9
Interest Income Recognized [Abstract]
Total:		0	0
Commercial
Unpaid Principal Balance [Abstract]
Total:	714	714	594
Recorded Investment [Abstract]
Total:	477	477	582
Related Allowance	9	9	15
Average Recorded Investment [Abstract]
Total:		531	654
Interest Income Recognized [Abstract]
Total:		18	35
Commercial Real Estate
Unpaid Principal Balance [Abstract]
Total:	1,586	1,586	3,194
Recorded Investment [Abstract]
Total:	1,554	1,554	2,867
Related Allowance	58	58	102
Average Recorded Investment [Abstract]
Total:		1,571	2,954
Interest Income Recognized [Abstract]
Total:		46	75
Construction and Farmland
Unpaid Principal Balance [Abstract]
Total:	369	369	1,320
Recorded Investment [Abstract]
Total:	324	324	1,324
Related Allowance	0	0	0
Average Recorded Investment [Abstract]
Total:		334	1,358
Interest Income Recognized [Abstract]
Total:		21	75
Residential Real Estate
Unpaid Principal Balance [Abstract]
Total:	8,857	8,857	9,225
Recorded Investment [Abstract]
Total:	8,257	8,257	8,619
Related Allowance	201	201	268
Average Recorded Investment [Abstract]
Total:		8,330	8,744
Interest Income Recognized [Abstract]
Total:		131	230
All Other Loans
Unpaid Principal Balance [Abstract]
Total:	0	0	0
Recorded Investment [Abstract]
Total:	0	0	0
Related Allowance	0	0	0
Average Recorded Investment [Abstract]
Total:		0	0
Interest Income Recognized [Abstract]
Total:		0	0
With No Related Allowance [Member]
Unpaid Principal Balance [Abstract]
With no related allowance:	8,543	8,543	10,895
Recorded Investment [Abstract]
With no related allowance:	7,896	7,896	10,335
Average Recorded Investment [Abstract]
With no related allowance:		7,992	10,586
Interest Income Recognized [Abstract]
With no related allowance:		137	294
With No Related Allowance [Member] | Commercial - Non Real Estate Commercial And Industrial
Unpaid Principal Balance [Abstract]
With no related allowance:	204	204	311
Recorded Investment [Abstract]
With no related allowance:	1	1	299
Average Recorded Investment [Abstract]
With no related allowance:		16	356
Interest Income Recognized [Abstract]
With no related allowance:		9	21
With No Related Allowance [Member] | Commercial Real Estate Owner Occupied
Unpaid Principal Balance [Abstract]
With no related allowance:	333	333	869
Recorded Investment [Abstract]
With no related allowance:	333	333	772
Average Recorded Investment [Abstract]
With no related allowance:		337	778
Interest Income Recognized [Abstract]
With no related allowance:		11	15
With No Related Allowance [Member] | Commercial Real Estate Non-Owner Occupied
Unpaid Principal Balance [Abstract]
With no related allowance:	442	442	1,298
Recorded Investment [Abstract]
With no related allowance:	408	408	1,066
Average Recorded Investment [Abstract]
With no related allowance:		415	1,137
Interest Income Recognized [Abstract]
With no related allowance:		7	13
With No Related Allowance [Member] | Construction And Farmland Commercial
Unpaid Principal Balance [Abstract]
With no related allowance:	369	369	1,320
Recorded Investment [Abstract]
With no related allowance:	324	324	1,324
Average Recorded Investment [Abstract]
With no related allowance:		334	1,358
Interest Income Recognized [Abstract]
With no related allowance:		21	75
With No Related Allowance [Member] | Consumer Installment
Unpaid Principal Balance [Abstract]
With no related allowance:	3	3	8
Recorded Investment [Abstract]
With no related allowance:	3	3	8
Average Recorded Investment [Abstract]
With no related allowance:		4	9
Interest Income Recognized [Abstract]
With no related allowance:		0	0
With No Related Allowance [Member] | Residential Equity Lines
Unpaid Principal Balance [Abstract]
With no related allowance:	234	234	17
Recorded Investment [Abstract]
With no related allowance:	57	57	17
Average Recorded Investment [Abstract]
With no related allowance:		61	18
Interest Income Recognized [Abstract]
With no related allowance:		0	0
With No Related Allowance [Member] | Residential Single Family
Unpaid Principal Balance [Abstract]
With no related allowance:	6,958	6,958	7,072
Recorded Investment [Abstract]
With no related allowance:	6,770	6,770	6,849
Average Recorded Investment [Abstract]
With no related allowance:		6,825	6,930
Interest Income Recognized [Abstract]
With no related allowance:		89	170
With No Related Allowance [Member] | All Other Loans
Unpaid Principal Balance [Abstract]
With no related allowance:	0	0	0
Recorded Investment [Abstract]
With no related allowance:	0	0	0
Average Recorded Investment [Abstract]
With no related allowance:		0	0
Interest Income Recognized [Abstract]
With no related allowance:		0	0
With An Allowance Recorded [Member]
Unpaid Principal Balance [Abstract]
With an allowance recorded:	2,986	2,986	3,446
Recorded Investment [Abstract]
With an allowance recorded:	2,719	2,719	3,065
Related Allowance	268	268	385
Average Recorded Investment [Abstract]
With an allowance recorded:		2,778	3,133
Interest Income Recognized [Abstract]
With an allowance recorded:		79	121
With An Allowance Recorded [Member] | Commercial - Non Real Estate Commercial And Industrial
Unpaid Principal Balance [Abstract]
With an allowance recorded:	510	510	283
Recorded Investment [Abstract]
With an allowance recorded:	476	476	283
Related Allowance	9	9	15
Average Recorded Investment [Abstract]
With an allowance recorded:		515	298
Interest Income Recognized [Abstract]
With an allowance recorded:		9	14
With An Allowance Recorded [Member] | Commercial Real Estate Owner Occupied
Unpaid Principal Balance [Abstract]
With an allowance recorded:			203
Recorded Investment [Abstract]
With an allowance recorded:			203
Related Allowance			37
Average Recorded Investment [Abstract]
With an allowance recorded:			205
Interest Income Recognized [Abstract]
With an allowance recorded:			10
With An Allowance Recorded [Member] | Commercial Real Estate Non-Owner Occupied
Unpaid Principal Balance [Abstract]
With an allowance recorded:	811	811	824
Recorded Investment [Abstract]
With an allowance recorded:	813	813	826
Related Allowance	58	58	65
Average Recorded Investment [Abstract]
With an allowance recorded:		819	834
Interest Income Recognized [Abstract]
With an allowance recorded:		28	37
With An Allowance Recorded [Member] | Construction And Farmland Commercial
Unpaid Principal Balance [Abstract]
With an allowance recorded:	0	0	0
Recorded Investment [Abstract]
With an allowance recorded:	0	0	0
Related Allowance	0	0	0
Average Recorded Investment [Abstract]
With an allowance recorded:		0	0
Interest Income Recognized [Abstract]
With an allowance recorded:		0	0
With An Allowance Recorded [Member] | Residential Equity Lines
Unpaid Principal Balance [Abstract]
With an allowance recorded:	217	217	458
Recorded Investment [Abstract]
With an allowance recorded:	46	46	115
Related Allowance	46	46	56
Average Recorded Investment [Abstract]
With an allowance recorded:		46	120
Interest Income Recognized [Abstract]
With an allowance recorded:		0	0
With An Allowance Recorded [Member] | Residential Single Family
Unpaid Principal Balance [Abstract]
With an allowance recorded:	1,448	1,448	1,678
Recorded Investment [Abstract]
With an allowance recorded:	1,384	1,384	1,638
Related Allowance	155	155	212
Average Recorded Investment [Abstract]
With an allowance recorded:		1,398	1,676
Interest Income Recognized [Abstract]
With an allowance recorded:		42	60
With An Allowance Recorded [Member] | All Other Loans
Unpaid Principal Balance [Abstract]
With an allowance recorded:	0	0	0
Recorded Investment [Abstract]
With an allowance recorded:	0	0	0
Related Allowance	$ 0	0	0
Average Recorded Investment [Abstract]
With an allowance recorded:		0	0
Interest Income Recognized [Abstract]
With an allowance recorded:		$ 0	$ 0