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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The tables below summarize the changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2019 and 2018, net of tax:
March 31, 2019 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2019 |  | $ | (6,759 | ) |  | $ | (339 | ) |  | $ | (7,098 | )
Other Comprehensive Income (Loss) Before Reclassification |  | 9,536 |  |  | — |  |  | 9,536 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (122 | ) |  | — |  |  | (122 | )
Net Current Period Other Comprehensive Income (Loss) |  | 9,414 |  |  | — |  |  | 9,414 |
Ending Balance at March 31, 2019 |  | $ | 2,655 |  |  | $ | (339 | ) |  | $ | 2,316 |
March 31, 2018 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2018 |  | $ | (2,335 | ) |  | $ | (285 | ) |  | $ | (2,620 | )
Other Comprehensive Income (Loss) Before Reclassification |  | (9,005 | ) |  | — |  |  | (9,005 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (213 | ) |  | — |  |  | (213 | )
Net Current Period Other Comprehensive Income (Loss) |  | (9,218 | ) |  | — |  |  | (9,218 | )
Ending Balance at March 31, 2018 |  | $ | (11,553 | ) |  | $ | (285 | ) |  | $ | (11,838 | )
Schedule of Classifications Out of Accumulated Other Comprehensive Income (Loss) | The tables below summarize the classifications out of accumulated other comprehensive income (loss) by component for the three months ended March 31, 2019 and 2018:
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | 155 |  |  | Net Gains on Securities
|  | (33 | ) |  | Income Tax Expense
|  | 122 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2019 |  | $ | 122 |  |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | 270 |  |  | Net Gains on Securities
|  | (57 | ) |  | Income Tax Expense
|  | 213 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2018 |  | $ | 213 |  |  |

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- Definition Tabular disclosure of the components of accumulated 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 + Details
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