Loans (Aging of Recorded Investment in Past Due Loans by Class of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	$ 1,418,589	[1]	$ 1,390,802	[2]
30-59 Days Past Due	3,536	[1]	3,589	[2]
60-89 Days Past Due	1,471	[1]	431	[2]
90 Days or More Past Due	2,806	[1]	3,565	[2]
Total Past Due	7,813	[1]	7,585	[2]
Loans Not Past Due	1,410,776	[1]	1,383,217	[2]
Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	366,919	[1]	351,903	[2]
30-59 Days Past Due	415		256
60-89 Days Past Due	46		78
90 Days or More Past Due	143		0
Total Past Due	604		334
Loans Not Past Due	366,315		351,569
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	596,114	[1]	583,604	[2]
30-59 Days Past Due	324		613
60-89 Days Past Due	30		62
90 Days or More Past Due	1,104		2,234
Total Past Due	1,458		2,909
Loans Not Past Due	594,656		580,695
Agricultural Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	190,368	[1]	195,171	[2]
30-59 Days Past Due	266		62
60-89 Days Past Due	0		0
90 Days or More Past Due	0		0
Total Past Due	266		62
Loans Not Past Due	190,102		195,109
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	83,888	[1]	81,812	[2]
30-59 Days Past Due	454		303
60-89 Days Past Due	191		33
90 Days or More Past Due	328		114
Total Past Due	973		450
Loans Not Past Due	82,915		81,362
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	46,834	[1]	49,265	[2]
30-59 Days Past Due	191		149
60-89 Days Past Due	45		66
90 Days or More Past Due	84		102
Total Past Due	320		317
Loans Not Past Due	46,514		48,948
Residential Mortgage Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	134,466	[1]	129,047	[2]
30-59 Days Past Due	1,886		2,206
60-89 Days Past Due	1,159		192
90 Days or More Past Due	1,147		1,115
Total Past Due	4,192		3,513
Loans Not Past Due	130,274		125,534
Loans Acquired With Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	11,552		14,753
30-59 Days Past Due	146		148
60-89 Days Past Due	0		0
90 Days or More Past Due	744		1,103
Total Past Due	890		1,251
Loans Not Past Due	$ 10,662		$ 13,502

[1] Total recorded investment in loans includes $5,258 in accrued interest.

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