Basis of Presentation (Non-Interest Income Including Revenue From Contracts With Customers In Scope Of ASU 2014-09) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total non-interest income	$ 1,371	$ 1,271	$ 3,976	$ 3,999
Total Revenue Not Within the Scope of ASC 606 [Member]
Revenue from contracts with customers	184	193	515	651
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member]
Revenue from contracts with customers	1,187	1,078	3,461	3,348
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges [Member]
Revenue from contracts with customers	274	282	848	936
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Non-Sufficient Funds Charges [Member]
Revenue from contracts with customers	157	173	458	538
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Business Analysis Charges [Member]
Revenue from contracts with customers	42	39	127	120
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Cycle Charges [Member
Revenue from contracts with customers	24	23	69	69
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Lockbox Fees [Member]
Revenue from contracts with customers	2	2	54	57
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Stop Payment Fees [Member]
Revenue from contracts with customers	5	4	12	14
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Wire Transfer Fees [Member]
Revenue from contracts with customers	23	20	66	64
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Other Service Charges [Member]
Revenue from contracts with customers	21	21	62	74
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Wealth Management [Member]
Revenue from contracts with customers	542	411	1,489	1,256
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Wealth Management DNB Investments & Insurance [Member]
Revenue from contracts with customers	185	115	423	361
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Wealth Management DNB First Investment Management & Trust [Member]
Revenue from contracts with customers	357	296	1,066	895
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income [Member]
Revenue from contracts with customers	371	385	1,124	1,156
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Cardholder Interchange Fees [Member]
Revenue from contracts with customers	257	245	771	733
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Safe Deposit Box [Member]
Revenue from contracts with customers	24	27	74	77
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Check Printing [Member]
Revenue from contracts with customers	14	15	49	54
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Merchant Card Processing [Member]
Revenue from contracts with customers	44	48	134	145
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income ATM Surcharges For Non-DNB Customers [Member]
Revenue from contracts with customers	19	22	56	62
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Other Fee [Member]
Revenue from contracts with customers	$ 13	$ 28	$ 40	$ 85