Income Taxes (Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Allowance for loan losses	$ 10,452	$ 10,666
Deferred compensation	972	938
Investment in limited partnerships	954	953
SERP agreements	767	704
Interest on nonaccrual loans	615	664
Benefit of tax credit carryforwards	502	569
Share-based compensation	538	565
Net unrealized loss on securities available for sale	420
Other than temporary impairment of investment securities		1,917
Other	328	520
Gross deferred tax assets	15,548	17,496
Prepaid pension costs	5,065	5,346
Intangible assets	2,667	2,662
Depreciation and amortization	1,004	1,249
Net unrealized gain on securities available for sale		1,039
Loan servicing assets	479	525
Gross deferred tax liabilities	9,215	10,821
Net deferred tax asset	$ 6,333	$ 6,675