Loans (Schedule of Aging of Recorded Investment in Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 1,457,768	[1]	$ 1,390,802	[2]
30-59 Days Past Due	3,532	[1]	3,589	[2]
60-89 Days Past Due	371	[1]	431	[2]
90 Days or More Past Due	3,039	[1]	3,565	[2]
Total Past Due	6,942	[1]	7,585	[2]
Loans Not Past Due	1,450,826	[1]	1,383,217	[2]
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	380,851	[1]	351,903	[2]
30-59 Days Past Due	628		256
60-89 Days Past Due	0		78
90 Days or More Past Due	148		0
Total Past Due	776		334
Loans Not Past Due	380,075		351,569
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	584,426	[1]	583,604	[2]
30-59 Days Past Due	504		613
60-89 Days Past Due	10		62
90 Days or More Past Due	753		2,234
Total Past Due	1,267		2,909
Loans Not Past Due	583,159		580,695
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	219,640	[1]	195,171	[2]
30-59 Days Past Due	25		62
60-89 Days Past Due	0		0
90 Days or More Past Due	75		0
Total Past Due	100		62
Loans Not Past Due	219,540		195,109
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	86,570	[1]	81,812	[2]
30-59 Days Past Due	197		303
60-89 Days Past Due	4		33
90 Days or More Past Due	268		114
Total Past Due	469		450
Loans Not Past Due	86,101		81,362
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	48,732	[1]	49,265	[2]
30-59 Days Past Due	132		149
60-89 Days Past Due	28		66
90 Days or More Past Due	75		102
Total Past Due	235		317
Loans Not Past Due	48,497		48,948
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	137,549	[1]	129,047	[2]
30-59 Days Past Due	2,046		2,206
60-89 Days Past Due	329		192
90 Days or More Past Due	1,720		1,115
Total Past Due	4,095		3,513
Loans Not Past Due	133,454		125,534
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	8,361		14,753
30-59 Days Past Due	0		148
60-89 Days Past Due	0		0
90 Days or More Past Due	648		1,103
Total Past Due	648		1,251
Loans Not Past Due	$ 7,713		$ 13,502

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

[2] Total recorded investment in loans includes $5,590 in accrued interest.