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Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance at January 1 | $ 15,945 |  |
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1 | (13,627) |  |
Other comprehensive loss before reclassifications | (1,462) | $ 4,968 | $ 758
Amounts reclassified from accumulated other comprehensive income | 93 | (784) | (480)
Net current-period other comprehensive loss | (1,369) | 4,184 | 278
Ending balance | 949 | 15,945 |
Unrealized Gains and Losses On Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance at January 1 | 16,003 | 11,871 | 11,598
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1 | (13,616) |  |
Other comprehensive loss before reclassifications | (1,499) | 4,922 | 758
Amounts reclassified from accumulated other comprehensive income | 93 | (790) | (485)
Net current-period other comprehensive loss | (1,406) | 4,132 | 273
Ending balance | 981 | 16,003 | 11,871
Postretirement Benefits Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance at January 1 | (58) | (110) | (115)
CumulativeEffectOnAccumulatedOtherComprehensiveIncomeNetOfTax1 | (11) |  |
Other comprehensive loss before reclassifications | 37 | 46 | 0
Amounts reclassified from accumulated other comprehensive income | 0 | 6 | 5
Net current-period other comprehensive loss | 37 | 52 | 5
Ending balance | (32) | (58) | (110)
Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance at January 1 | 15,945 | 11,761 | 11,483
Ending balance | $ 949 | $ 15,945 | $ 11,761

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- Definition Accumulated Other Comprehensive Income (Loss) [Roll Forward] + References No definition available. + Details
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- Definition Amount of the cumulative effect on other comprehensive income net of related income tax effect. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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