Loans (Schedule of Recorded Investment in Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	$ 11,091	$ 3,793
Loans Past Due 90 Days or More & Still Accruing	742	2
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	4,753	86
Loans Past Due 90 Days or More & Still Accruing	0	2
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	4,618	1,408
Loans Past Due 90 Days or More & Still Accruing	474	0
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	748	792
Loans Past Due 90 Days or More & Still Accruing	268	0
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	199	73
Loans Past Due 90 Days or More & Still Accruing	0	0
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	286	85
Loans Past Due 90 Days or More & Still Accruing	0	0
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	487	1,349
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	866	1,264
Loans Past Due 90 Days or More & Still Accruing	$ 0	$ 0