Loans (Schedule of Carrying Amount of Loans with Deterioration of Credit Quality) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	$ 2,042,770	$ 2,001,415
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	468,965	458,538
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	871,970	858,030
Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	316,764	306,946
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	61,334	60,099
Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	181,886	183,770
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	9,513	11,048
Carrying Amount, Net of Allowance		9,453	10,943
Receivables Acquired with Deteriorated Credit Quality | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	1,247	1,656
Receivables Acquired with Deteriorated Credit Quality | Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	6,602	7,688
Receivables Acquired with Deteriorated Credit Quality | Agricultural Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	683	706
Receivables Acquired with Deteriorated Credit Quality | Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	53	53
Receivables Acquired with Deteriorated Credit Quality | Residential Mortgage Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred income	[1]	$ 928	$ 945

[1] Total recorded investment in loans includes $7,623 in accrued interest.