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Income Taxes (Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Allowance for loan losses | $ 7,810 | $ 8,550
Deferred compensation | 1,095 | 1,771
Investment in limited partnerships | 1,191 | 660
SERP agreements | 418 | 417
Interest on nonaccrual loans | 191 | 106
Share-based compensation | 586 | 541
Net unrealized loss on securities available for sale |  | 2,848
Other | 224 | 138
Gross deferred tax assets | 11,515 | 15,031
Prepaid expenses | 498 | 583
Prepaid pension costs | 897 | 1,415
Intangible assets | 2,643 | 2,581
Depreciation and amortization | 1,961 | 2,096
Net unrealized gain on securities available for sale | 301 |
Loan servicing assets | 289 | 258
Other | 550 | 240
Gross deferred tax liabilities | 7,139 | 7,173
Net deferred tax asset | $ 4,376 | $ 7,858

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