Loans (Schedule of Recorded Investment in Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	$ 8,428	$ 11,091
Loans Past Due 90 Days or More & Still Accruing	70	742
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	2,400	4,753
Loans Past Due 90 Days or More & Still Accruing	0	0
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	4,667	4,618
Loans Past Due 90 Days or More & Still Accruing	70	474
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	552	748
Loans Past Due 90 Days or More & Still Accruing	0	268
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	59	199
Loans Past Due 90 Days or More & Still Accruing	0	0
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	148	286
Loans Past Due 90 Days or More & Still Accruing	0	0
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	602	487
Loans Past Due 90 Days or More & Still Accruing	0	0
Loans Acquired With Deteriorated Credit Quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	609	866
Loans Past Due 90 Days or More & Still Accruing	$ 70	$ 0