Loans & Leases and Allowance for Credit Losses, Loans by Class Modified as Troubled Debt Restructured Loans (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) Loan	Jun. 30, 2014 USD ($) Loan	Jun. 30, 2015 USD ($) Loan	Jun. 30, 2014 USD ($) Loan	Dec. 31, 2014 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Specific reserves	$ 1,100,000	$ 1,100,000	$ 1,100,000	$ 1,100,000	$ 1,300,000
Troubled debt restructured loans	6,500,000	6,200,000	6,500,000	6,200,000	6,600,000
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			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 | Loan	0	3	1	6	11
Pre-Modification Outstanding Recorded Investment	$ 0	$ 116,000	$ 131,000	$ 395,000	$ 1,012,000
Post-Modification Outstanding Recorded Investment	0	102,000	119,000	379,000	950,000
Increase in allowance for credit losses due to TDR	0		114,000		28,000
TDR's charge-offs	$ 0	$ 14,000	$ 12,000	$ 17,000	$ 63,000
Number of loans modified as troubled debt restructurings with subsequent payment defaults | Loan	0	0	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				5 years	4 years
Period of modifications involving extension of maturity date				5 years	6 months
Maximum [Member]
Financing Receivable, Modifications [Line Items]
Period of modifications involving a reduction of stated interest rate of the loan				30 years	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	$ 4,800,000	$ 4,200,000	$ 4,800,000	$ 4,200,000	$ 5,000,000
Residential 1st Mortgages [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan		1		3	5
Pre-Modification Outstanding Recorded Investment		$ 69,000		$ 316,000	$ 857,000
Post-Modification Outstanding Recorded Investment		$ 60,000		$ 305,000	$ 804,000
Home Equity Lines & Loans [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan		2		3	3
Pre-Modification Outstanding Recorded Investment		$ 47,000		$ 79,000	$ 98,000
Post-Modification Outstanding Recorded Investment		$ 42,000		$ 74,000	$ 89,000
Agricultural [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan					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 | Loan	0		1		1
Pre-Modification Outstanding Recorded Investment	$ 0		$ 131,000		$ 18,000
Post-Modification Outstanding Recorded Investment	$ 0		$ 119,000		$ 18,000
Consumer & Other [Member]
Loans by class modified as troubled debt restructured loans [Abstract]
Number of Loans | Loan					1
Pre-Modification Outstanding Recorded Investment					$ 7,000
Post-Modification Outstanding Recorded Investment					$ 7,000