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, 2015 Loan	Mar. 31, 2014 Loan	Dec. 31, 2014 Loan
Financing Receivable, Modifications [Line Items]
Specific reserves	$ 1,300,000	$ 1,100,000	$ 1,300,000
Troubled debt restructured loans	6,500,000	6,300,000	6,600,000
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	10 years
Period of modifications involving extension of maturity date	10 years
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	1	3	11
Pre-Modification Outstanding Recorded Investment	131,000	279,000	1,012,000
Post-Modification Outstanding Recorded Investment	119,000	277,000	950,000
Increase in allowance for credit losses due to TDR	114,000		28,000
TDR's charge-offs	12,000	2,000	63,000
Number of loans modified as troubled debt restructurings with subsequent payment defaults	0	0	0
Period after which loan is considered to be in payment default	90 days	90 days	90 days
Minimum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving a reduction of stated interest rate of the loan			4 years
Period of modifications involving extension of maturity date		5 months	6 months
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving a reduction of stated interest rate of the loan			30 years
Period of modifications involving extension of maturity date		30 years	30 years
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructured loans	4,900,000	4,000,000	5,000,000
Residential 1st Mortgages [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans		2	5
Pre-Modification Outstanding Recorded Investment		247,000	857,000
Post-Modification Outstanding Recorded Investment		245,000	804,000
Home Equity Lines & Loans [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans			3
Pre-Modification Outstanding Recorded Investment			98,000
Post-Modification Outstanding Recorded Investment			89,000
Agricultural [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans		1	1
Pre-Modification Outstanding Recorded Investment		32,000	32,000
Post-Modification Outstanding Recorded Investment		32,000	32,000
Commercial [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans	1		1
Pre-Modification Outstanding Recorded Investment	131,000		18,000
Post-Modification Outstanding Recorded Investment	119,000		18,000
Consumer & Other [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans			1
Pre-Modification Outstanding Recorded Investment			7,000
Post-Modification Outstanding Recorded Investment			$ 7,000