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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Net unrealized holding gains in available for sale securities, excluded from deferred tax assets (liabilities) calculation | $ 7,500,000 | $ 4,300,000 |
Employee benefit plan deferred tax assets, excluded from deferred tax asset calculation | 12,900,000 | 12,600,000 |
Federal tax reform remeasurement of AOCI deferred tax asset | 0 | 9,958,000 | $ 0
Deferred tax assets, valuation allowance | 0 | 0 |
Unrecognized tax benefits | $ 0 | 0 |
Re-measurement of net deferred tax asset resulting in additional income tax expense |  | $ 14,900,000 |

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- Definition The value of net unrealized holding gains in available for sale securities excluded from deferred tax liabilities calculation as of the balance sheet date. + References No definition available. + Details
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