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Income Taxes (Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Taxes [Abstract] |  |
Allowance for loan losses | $ 11,938 | $ 10,452
Deferred compensation | 1,357 | 972
Investment in limited partnerships | 943 | 954
SERP agreements | 682 | 767
Interest on nonaccrual loans | 453 | 615
Benefit of tax credit carryforwards |  | 502
Share-based compensation | 604 | 538
Net unrealized loss on securities available for sale | 2,326 | 420
Other | 120 | 328
Gross deferred tax assets | 18,423 | 15,548
Prepaid pension costs | 4,727 | 5,065
Intangible assets | 4,059 | 2,667
Depreciation and amortization | 1,085 | 1,004
Loan servicing assets | 415 | 479
Other | 234 |
Gross deferred tax liabilities | 10,520 | 9,215
Net deferred tax asset | $ 7,903 | $ 6,333

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