Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Allowance for Loan Losses and Credit Quality of Loans [Abstract]
Minimum balance for classified loans to be evaluated individually for impairment	$ 500,000		$ 500,000
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	31,884,000		31,884,000		31,440,000
Unpaid Principal Balance (Legal)	36,984,000		36,984,000		35,430,000
Related Allowance	2,100,000		2,100,000		715,000
Average Recorded Investment	32,027,000	20,716,000	32,339,000	21,911,000
Interest Income Recognized	151,000	36,000	284,000	193,000
Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	22,250,000	20,176,000	22,472,000	21,911,000
Interest Income Recognized	151,000	36,000	284,000	193,000
Originated Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,013,000	3,354,000	2,025,000	4,331,000
Interest Income Recognized	0	29,000	0	58,000
Originated Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	10,062,000	11,222,000	10,739,000	11,361,000
Interest Income Recognized	42,000	(51,000)	84,000	21,000
Originated Loans [Member] | Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	123,000	201,000	124,000	270,000
Interest Income Recognized	0	(3,000)	1,000	1,000
Originated Loans [Member] | Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	1,412,000	896,000	1,418,000	898,000
Interest Income Recognized	12,000	12,000	23,000	24,000
Originated Loans [Member] | Business Banking [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	548,000	78,000	429,000	79,000
Interest Income Recognized	11,000	3,000	23,000	3,000
Originated Loans [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	5,289,000	2,967,000	4,959,000	2,944,000
Interest Income Recognized	60,000	29,000	103,000	58,000
Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	2,803,000	1,998,000	2,778,000	2,028,000
Interest Income Recognized	26,000	17,000	50,000	28,000
Acquired Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	9,777,000	0	9,868,000	0
Interest Income Recognized	0	0	0	0
Acquired Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,315,000	0	6,375,000	0
Interest Income Recognized	0	0	0	0
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	3,462,000	0	3,493,000	0
Interest Income Recognized	0	0	0	0
With No Allowance Recorded [Member] | Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	19,419,000		19,419,000		16,360,000
Unpaid Principal Balance (Legal)	22,003,000		22,003,000		18,173,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	11,081,000		11,081,000		11,100,000
Unpaid Principal Balance (Legal)	12,899,000		12,899,000		12,446,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	2,000,000		2,000,000		4,721,000
Unpaid Principal Balance (Legal)	2,096,000		2,096,000		4,777,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	6,854,000		6,854,000		4,613,000
Unpaid Principal Balance (Legal)	7,823,000		7,823,000		5,164,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	119,000		119,000		125,000
Unpaid Principal Balance (Legal)	189,000		189,000		195,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Agricultural Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	1,406,000		1,406,000		1,431,000
Unpaid Principal Balance (Legal)	1,697,000		1,697,000		1,708,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Business Banking [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	702,000		702,000		210,000
Unpaid Principal Balance (Legal)	1,094,000		1,094,000		602,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	5,600,000		5,600,000		3,248,000
Unpaid Principal Balance (Legal)	6,031,000		6,031,000		3,472,000
With No Allowance Recorded [Member] | Originated Loans [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	2,738,000		2,738,000		2,012,000
Unpaid Principal Balance (Legal)	3,073,000		3,073,000		2,255,000
With No Allowance Recorded [Member] | Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	3,430,000		3,430,000		10,060,000
Unpaid Principal Balance (Legal)	3,836,000		3,836,000		10,380,000
With No Allowance Recorded [Member] | Acquired Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	0		0		6,501,000
Unpaid Principal Balance (Legal)	0		0		6,538,000
With No Allowance Recorded [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	3,430,000		3,430,000		3,559,000
Unpaid Principal Balance (Legal)	3,836,000		3,836,000		3,842,000
With An Allowance Recorded [Member] | Originated Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	2,793,000		2,793,000		5,020,000
Unpaid Principal Balance (Legal)	4,649,000		4,649,000		6,877,000
Related Allowance	600,000		600,000		715,000
With An Allowance Recorded [Member] | Acquired Loans [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment Balance (Book)	6,242,000		6,242,000		0
Unpaid Principal Balance (Legal)	6,496,000		6,496,000		0
Related Allowance	$ 1,500,000		$ 1,500,000		$ 0