Loans (Schedule of Recorded Investment in Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	$ 12,579	$ 11,091
Loans Past Due 90 Days or More & Still Accruing	642	742
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	2,430	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	6,833	4,618
Loans Past Due 90 Days or More & Still Accruing	368	474
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	1,449	748
Loans Past Due 90 Days or More & Still Accruing	274	268
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	88	199
Loans Past Due 90 Days or More & Still Accruing	0	0
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	162	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	1,617	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	4,162	866
Loans Past Due 90 Days or More & Still Accruing	141	0
Loans Acquired with Deteriorated Credit Quality | Branch and Bank Acquisitions
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual	4,603	0
Loans Past Due 90 Days or More & Still Accruing	$ 96	$ 0