Loans (Aging of Recorded Investment in Past Due Loans by Class of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	$ 1,442,748	[1]	$ 1,390,802	[2]
30-59 Days Past Due	2,923	[1]	3,589	[2]
60-89 Days Past Due	988	[1]	431	[2]
90 Days or More Past Due	2,994	[1]	3,565	[2]
Total Past Due	6,905	[1]	7,585	[2]
Loans Not Past Due	1,435,843	[1]	1,383,217	[2]
Commercial and Industrial Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	378,720	[1]	351,903	[2]
30-59 Days Past Due	265		256
60-89 Days Past Due	40		78
90 Days or More Past Due	307		0
Total Past Due	612		334
Loans Not Past Due	378,108		351,569
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	587,366	[1]	583,604	[2]
30-59 Days Past Due	411		613
60-89 Days Past Due	0		62
90 Days or More Past Due	889		2,234
Total Past Due	1,300		2,909
Loans Not Past Due	586,066		580,695
Agricultural Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	204,792	[1]	195,171	[2]
30-59 Days Past Due	105		62
60-89 Days Past Due	74		0
90 Days or More Past Due	13		0
Total Past Due	192		62
Loans Not Past Due	204,600		195,109
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	85,474	[1]	81,812	[2]
30-59 Days Past Due	330		303
60-89 Days Past Due	0		33
90 Days or More Past Due	308		114
Total Past Due	638		450
Loans Not Past Due	84,836		81,362
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	48,737	[1]	49,265	[2]
30-59 Days Past Due	175		149
60-89 Days Past Due	63		66
90 Days or More Past Due	66		102
Total Past Due	304		317
Loans Not Past Due	48,433		48,948
Residential Mortgage Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	137,659	[1]	129,047	[2]
30-59 Days Past Due	1,637		2,206
60-89 Days Past Due	811		192
90 Days or More Past Due	1,411		1,115
Total Past Due	3,859		3,513
Loans Not Past Due	133,800		125,534
Loans Acquired With Deteriorated Credit Quality (Included in the Total Above)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Ending Loans Balance	8,731		14,753
30-59 Days Past Due	0		148
60-89 Days Past Due	0		0
90 Days or More Past Due	645		1,103
Total Past Due	645		1,251
Loans Not Past Due	$ 8,086		$ 13,502

[1] Total recorded investment in loans includes $5,974 in accrued interest.

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