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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2019 and 2018, net of tax:
June 30, 2019 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2019 |  | $ | 2,655 |  |  | $ | (339 | ) |  | $ | 2,316 |
Other Comprehensive Income (Loss) Before Reclassification |  | 9,299 |  |  | — |  |  | 9,299 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (408 | ) |  | — |  |  | (408 | )
Net Current Period Other Comprehensive Income (Loss) |  | 8,891 |  |  | — |  |  | 8,891 |
Ending Balance at June 30, 2019 |  | $ | 11,546 |  |  | $ | (339 | ) |  | $ | 11,207 |
June 30, 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 |  | 18,835 |  |  | — |  |  | 18,835 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (530 | ) |  | — |  |  | (530 | )
Net Current Period Other Comprehensive Income (Loss) |  | 18,305 |  |  | — |  |  | 18,305 |
Ending Balance at June 30, 2019 |  | $ | 11,546 |  |  | $ | (339 | ) |  | $ | 11,207 |
June 30, 2018 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2018 |  | $ | (11,553 | ) |  | $ | (285 | ) |  | $ | (11,838 | )
Other Comprehensive Income (Loss) Before Reclassification |  | (1,443 | ) |  | — |  |  | (1,443 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (58 | ) |  | — |  |  | (58 | )
Net Current Period Other Comprehensive Income (Loss) |  | (1,501 | ) |  | — |  |  | (1,501 | )
Ending Balance at June 30, 2018 |  | $ | (13,054 | ) |  | $ | (285 | ) |  | $ | (13,339 | )
June 30, 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 |  | (10,448 | ) |  | — |  |  | (10,448 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (271 | ) |  | — |  |  | (271 | )
Net Current Period Other Comprehensive Income (Loss) |  | (10,719 | ) |  | — |  |  | (10,719 | )
Ending Balance at June 30, 2018 |  | $ | (13,054 | ) |  | $ | (285 | ) |  | $ | (13,339 | )
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 and six months ended June 30, 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 |  | $ | 516 |  |  | Net Gains on Securities
|  | (108 | ) |  | Income Tax Expense
|  | 408 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2019 |  | $ | 408 |  |  |
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 |  | $ | 671 |  |  | Net Gains on Securities
|  | (141 | ) |  | Income Tax Expense
|  | 530 |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2019 |  | $ | 530 |  |  |
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 |  | $ | 74 |  |  | Net Gains on Securities
|  | (16 | ) |  | Income Tax Expense
|  | 58 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2018 |  | $ | 58 |  |  |
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 |  | $ | 344 |  |  | Net Gains on Securities
|  | (73 | ) |  | Income Tax Expense
|  | 271 |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2018 |  | $ | 271 |  |  |

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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=118930883&loc=SL7669686-108580 + Details
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