Loans (Loans Individually Evaluated for Impairment by Class of Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 11,631	[1]		$ 11,631	[1]		$ 15,052	[1]
Recorded Investment	9,705			9,705			12,663
Allowance for Loan Losses Allocated	3,690			3,690			5,411
Average Recorded Investment	10,809		13,420	12,294		15,168
Interest Income Recognized	61		23	250		46
Cash Basis Recognized	55		21	251		42
Impaired Financing Receivables with No Related Allowance [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,143	[1]		2,143	[1]		108	[1]
Recorded Investment	2,161			2,161			87
Allowance for Loan Losses Allocated	0			0			0
Average Recorded Investment	2,223		139	818		298
Interest Income Recognized	33		1	33		3
Cash Basis Recognized	32		1	33		3
Impaired Financing Receivables with No Related Allowance [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,694	[1]		3,694	[1]		4,312	[1]
Recorded Investment	1,907			1,907			2,154
Allowance for Loan Losses Allocated	0			0			0
Average Recorded Investment	1,956		3,353	2,196		5,023
Interest Income Recognized	1		12	1		17
Cash Basis Recognized	2		12	2		17
Impaired Financing Receivables with No Related Allowance [Member] | Agricultural Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	675	[1]		675	[1]		2,126	[1]
Recorded Investment	688			688			2,137
Allowance for Loan Losses Allocated	0			0			0
Average Recorded Investment	751		0	1,738		49
Interest Income Recognized	21		0	196		2
Cash Basis Recognized	16		0	200		2
Impaired Financing Receivables with No Related Allowance [Member] | Subtotal [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	6,512	[1]		6,512	[1]		6,546	[1]
Recorded Investment	4,756			4,756			4,378
Allowance for Loan Losses Allocated	0			0			0
Average Recorded Investment	4,930		3,492	4,752		5,370
Interest Income Recognized	55		13	230		22
Cash Basis Recognized	50		13	235		22
Impaired Financing Receivables with Related Allowance [Member] | Commercial and Industrial Loans and Leases [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	511	[1]		511	[1]		2,642	[1]
Recorded Investment	461			461			2,581
Allowance for Loan Losses Allocated	461			461			1,347
Average Recorded Investment	464		2,749	1,797		2,795
Interest Income Recognized	1		4	3		7
Cash Basis Recognized	1		3	3		6
Impaired Financing Receivables with Related Allowance [Member] | Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,608	[1]		4,608	[1]		5,579	[1]
Recorded Investment	4,488			4,488			5,418
Allowance for Loan Losses Allocated	3,229			3,229			3,914
Average Recorded Investment	5,415		7,179	5,745		7,003
Interest Income Recognized	5		6	17		17
Cash Basis Recognized	4		5	13		14
Impaired Financing Receivables with Related Allowance [Member] | Agricultural Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	[1]		0	[1]		285	[1]
Recorded Investment	0			0			286
Allowance for Loan Losses Allocated	0			0			150
Average Recorded Investment	0		0	0		0
Interest Income Recognized	0		0	0		0
Cash Basis Recognized	0		0	0		0
Impaired Financing Receivables with Related Allowance [Member] | Subtotal [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,119	[1]		5,119	[1]		8,506	[1]
Recorded Investment	4,949			4,949			8,285
Allowance for Loan Losses Allocated	3,690			3,690			5,411
Average Recorded Investment	5,879		9,928	7,542		9,798
Interest Income Recognized	6		10	20		24
Cash Basis Recognized	5		8	16		20
Loans Acquired With Deteriorated Credit Quality With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	125	[1]		125	[1]		45	[1]
Recorded Investment	119			119			25
Allowance for Loan Losses Allocated	0			0			0
Average Recorded Investment	119		471	39		169
Interest Income Recognized	0		1	0		1
Cash Basis Recognized	0		1	0		1
Loans Acquired With Deteriorated Credit Quality With Additional Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	34	[1]		34	[1]		155	[1]
Recorded Investment	9			9			118
Allowance for Loan Losses Allocated	9			9			88
Average Recorded Investment	214		134	182		93
Interest Income Recognized	1		3	2		3
Cash Basis Recognized	$ 1		$ 3	$ 2		$ 3

[1] Unpaid Principal Balance is the remaining contractual payments inclusive of partial charge-offs.