Loans & Leases and Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014 Loan	Sep. 30, 2013 Loan	Sep. 30, 2014 Loan	Sep. 30, 2013 Loan	Dec. 31, 2013 Loan
Financing Receivable, Modifications [Line Items]
Specific reserves	$ 1,300,000	$ 364,000	$ 1,300,000	$ 364,000	$ 1,200,000
Troubled debt restructured loans	6,400,000	2,000,000	6,400,000	2,000,000	6,800,000
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings	0	0	0	0	0
Period of modifications involving a reduction of stated interest rate of the loan				5 years	5 years
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	2	0	8	8	12
Pre-Modification Outstanding Recorded Investment	299,000	0	695,000	793,000	5,736,000
Post-Modification Outstanding Recorded Investment	269,000	0	649,000	766,000	5,693,000
Increase in allowance for credit losses due to TDR	51,000	0	50,000	4,000
TDR's charge-offs	30,000	0	46,000	27,000	43,000
Charge offs on troubled debt restructurings that subsequently defaulted			0
Period after which loan is considered to be in payment default			90 days
Number of loans modified as troubled debt restructurings with subsequent payment defaults	0		0
Loans modified as troubled debt restructurings with subsequent payment defaults	0		0
Minimum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving extension of maturity date			5 years	6 months	6 months
Period of modifications involving a reduction of stated interest rate of the loan			5 years
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving extension of maturity date			30 years	10 years	10 years
Period of modifications involving a reduction of stated interest rate of the loan			30 years
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured loans, performing	4,500,000	1,500,000	4,500,000	1,500,000	4,600,000
Residential 1st Mortgages [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	1	0	4	4	4
Pre-Modification Outstanding Recorded Investment	248,000	0	565,000	306,000	306,000
Post-Modification Outstanding Recorded Investment	222,000	0	528,000	290,000	290,000
Home Equity Lines & Loans [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	1	0	3	2	4
Pre-Modification Outstanding Recorded Investment	51,000	0	98,000	195,000	414,000
Post-Modification Outstanding Recorded Investment	47,000	0	89,000	184,000	387,000
Agricultural [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	0		1
Pre-Modification Outstanding Recorded Investment	0		32,000
Post-Modification Outstanding Recorded Investment	0		32,000
Commercial [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans		0		2	4
Pre-Modification Outstanding Recorded Investment		0		292,000	5,016,000
Post-Modification Outstanding Recorded Investment		0		292,000	5,016,000
Number of loans modified as troubled debt restructurings with subsequent payment defaults				1	1
Loans modified as troubled debt restructurings with subsequent payment defaults				$ 277,000	$ 174,000