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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

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