Loans and Asset Quality Information (Schedule of Accruing Restructured Loans Defaulted in Period) (Details) - All Total Loans [Member] $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted	3	1	4	2
Recorded Investment - Subsequently defaulted	$ 823	$ 254	$ 1,393	$ 880
Real estate - mortgage - commercial and other [Member]
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted	2		3
Recorded Investment - Subsequently defaulted	$ 763		$ 1,333
Real estate - mortgage - residential (1-4 family) first mortgages [Member]
Accruing TDRs that subsequently defaulted
Number of Contracts - Subsequently defaulted	1	1	1	2
Recorded Investment - Subsequently defaulted	$ 60	$ 254	$ 60	$ 880