Loans (Schedule of Aging of Recorded Investment in Loans) (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		$ 1,574,027	[1],[2]	$ 1,457,768	[3],[4]
Total Past Due		4,831	[2]	6,942	[4]
Loans Not Past Due		1,569,196	[2]	1,450,826	[4]
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		419,176	[1]	380,851	[3]
Total Past Due		323		776
Loans Not Past Due		418,853		380,075
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		620,163	[1]	584,426	[3]
Total Past Due		403		1,267
Loans Not Past Due		619,760		583,159
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		249,699	[1]	219,640	[3]
Total Past Due		0		100
Loans Not Past Due		249,699		219,540
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		98,167	[1]	86,570	[3]
Total Past Due		437		469
Loans Not Past Due		97,730		86,101
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		50,169	[1]	48,732	[3]
Total Past Due		231		235
Loans Not Past Due		49,938		48,497
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		136,653	[1]	137,549	[3]
Total Past Due		3,437		4,095
Loans Not Past Due		133,216		133,454
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		7,555		8,361
Total Past Due		0		648
Loans Not Past Due		7,555		7,713
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	3,159		3,532
Financing Receivables, 30 to 59 Days Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		82		628
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		136		504
Financing Receivables, 30 to 59 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		25
Financing Receivables, 30 to 59 Days Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		225		197
Financing Receivables, 30 to 59 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		101		132
Financing Receivables, 30 to 59 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,615		2,046
Financing Receivables, 30 to 59 Days Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		0
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	482		371
Financing Receivables, 60 to 89 Days Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		117		0
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		163		10
Financing Receivables, 60 to 89 Days Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		0
Financing Receivables, 60 to 89 Days Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		8		4
Financing Receivables, 60 to 89 Days Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		40		28
Financing Receivables, 60 to 89 Days Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		154		329
Financing Receivables, 60 to 89 Days Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		0
Financing Receivables, 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	1,190		3,039
Financing Receivables, 90 Days or More Past Due | Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		124		148
Financing Receivables, 90 Days or More Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		104		753
Financing Receivables, 90 Days or More Past Due | Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0		75
Financing Receivables, 90 Days or More Past Due | Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		204		268
Financing Receivables, 90 Days or More Past Due | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		90		75
Financing Receivables, 90 Days or More Past Due | Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		668		1,720
Financing Receivables, 90 Days or More Past Due | Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 0		$ 648

[1] Total recorded investment in loans includes $5,952 in accrued interest.

[2] Total recorded investment in loans includes $5,952 in accrued interest.

[3] Total recorded investment in loans includes $5,778 in accrued interest.

[4] Total recorded investment in loans includes $5,778 in accrued interest.