Loans & Leases and Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014 Loan	Mar. 31, 2013 Loan	Dec. 31, 2013 Loan
Financing Receivable, Modifications [Line Items]
Specific reserves	$ 1,100,000	$ 444,000	$ 1,200,000
Troubled debt restructured loans	6,300,000	2,100,000	6,800,000
Commitments to lend additional amounts to customers with outstanding loans that are classified as troubled debt restructurings	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	3	7	12
Pre-Modification Outstanding Recorded Investment	279,000	614,000	5,736,000
Post-Modification Outstanding Recorded Investment	277,000	597,000	5,693,000
Increase in allowance for credit losses due to TDR		61,000
TDR's charge-offs	2,000	17,000	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
Payment defaults on loans modified as troubled debt restructurings			174,000
Minimum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving extension of maturity date	5 years	16 months	6 months
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving extension of maturity date	30 years	10 years	10 years
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured loans, performing	4,000,000	1,400,000	4,600,000
Residential 1st Mortgages [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	2	4	4
Pre-Modification Outstanding Recorded Investment	247,000	306,000	306,000
Post-Modification Outstanding Recorded Investment	245,000	290,000	290,000
Home Equity Lines & Loans [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans		1	4
Pre-Modification Outstanding Recorded Investment		16,000	414,000
Post-Modification Outstanding Recorded Investment		15,000	387,000
Agricultural [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	1
Pre-Modification Outstanding Recorded Investment	32,000
Post-Modification Outstanding Recorded Investment	32,000
Commercial [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans		2	4
Pre-Modification Outstanding Recorded Investment		292,000	5,016,000
Post-Modification Outstanding Recorded Investment		$ 292,000	$ 5,016,000