Summary of Significant Accounting Policies (Non-Interest Income Including Revenue From Contracts With Customers In Scope Of ASU 2014-09) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Total non-interest income	$ 1,269	$ 1,371	$ 1,332	$ 1,273	$ 1,419	$ 1,271	$ 1,422	$ 1,306	$ 5,245	$ 5,418
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member]
Revenue from contracts with customers									4,586	4,464
Total non-interest income									5,245	5,418
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges [Member]
Revenue from contracts with customers									1,119	1,223
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Non-sufficient Funds Charges [Member]
Revenue from contracts with customers									605	696
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Business Analysis Charges [Member]
Revenue from contracts with customers									180	175
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Cycle Charges [Member
Revenue from contracts with customers									90	92
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Lockbox Fees [Member]
Revenue from contracts with customers									57	59
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Stop Payment Fees [Member]
Revenue from contracts with customers									18	19
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Wire Transfer Fees [Member]
Revenue from contracts with customers									89	87
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Service Charges Other Service Charges [Member]
Revenue from contracts with customers									80	95
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Wealth Management [Member]
Revenue from contracts with customers									1,955	1,713
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Wealth Management DNB Investments & Insurance [Member]
Revenue from contracts with customers									545	506
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									1,410	1,207
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income [Member]
Revenue from contracts with customers									1,512	1,528
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Cardholder Interchange Fees [Member]
Revenue from contracts with customers									1,047	989
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Safe Deposit Box [Member]
Revenue from contracts with customers									97	99
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Check Printing [Member]
Revenue from contracts with customers									65	70
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Merchant Card Processing [Member]
Revenue from contracts with customers									177	189
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									74	81
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Other Fee Income Other Fee [Member]
Revenue from contracts with customers									52	100
Revenue from Contracts with Customers in Scope of ASU 2014-09 [Member] | Total Revenue Not Within the Scope of ASC 606 [Member]
Revenue from contracts with customers									$ 659	$ 954