Loans (Allowance for Loan Losses by Portfolio Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 14,929	$ 14,584
Provision for Loan Losses	250	350
Recoveries	151	823
Loans Charged-off	(161)	(273)
Ending Balance	15,169	15,484
Commercial and Industrial Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4,627	3,983
Provision for Loan Losses	101	1,322
Recoveries	41	69
Loans Charged-off	(22)	0
Ending Balance	4,747	5,374
Commercial Real Estate Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7,273	8,335
Provision for Loan Losses	(52)	(1,057)
Recoveries	8	703
Loans Charged-off	0	(111)
Ending Balance	7,229	7,870
Agricultural Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	1,123	946
Provision for Loan Losses	19	(16)
Recoveries	0	0
Loans Charged-off	0	0
Ending Balance	1,142	930
Home Equity Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	246	239
Provision for Loan Losses	72	0
Recoveries	0	0
Loans Charged-off	0	(30)
Ending Balance	318	209
Consumer Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	354	188
Provision for Loan Losses	35	48
Recoveries	100	47
Loans Charged-off	(100)	(97)
Ending Balance	389	186
Residential Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	622	281
Provision for Loan Losses	88	7
Recoveries	2	4
Loans Charged-off	(39)	(35)
Ending Balance	673	257
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	684	612
Provision for Loan Losses	(13)	46
Recoveries	0	0
Loans Charged-off	0	0
Ending Balance	$ 671	$ 658