Loans (Schedule of Recorded Investment in Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	$ 9,177	$ 3,793
Loans Past Due 90 Days or More & Still Accruing	478	2
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	2,948	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 Loans	3,836	1,408
Loans Past Due 90 Days or More & Still Accruing	478	0
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	961	792
Loans Past Due 90 Days or More & Still Accruing	0	0
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	138	73
Loans Past Due 90 Days or More & Still Accruing	0	0
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	364	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 Loans	930	1,349
Loans Past Due 90 Days or More & Still Accruing	0	0
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Accrual Loans	859	1,264
Loans Past Due 90 Days or More & Still Accruing	$ 0	$ 0