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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning | $ 218,985 | $ 150,271 | $ 150,271
Before reclassifications | 2,475 |  | (1,858)
Reclassifications | 14 |  | 6
Balance ending | 224,018 | 148,584 | 218,985
Total [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning |  | (2,867) | (2,867)
Balance ending | (2,230) | (5,843) |
Unrealized Gains and Losses on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning |  | (2,698) | (2,698)
Before reclassifications | 2,475 |  | (1,939)
Reclassifications | 14 |  | 6
Balance ending | (2,142) |  |
Changes in Pension Plan Assets and Benefit Obligations [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning |  | (169) | (169)
Before reclassifications | 0 |  | 81
Reclassifications | 0 |  | 0
Balance ending | (88) |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning | 218,985 |  |
Balance ending |  |  | 218,985
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Total [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning | (4,719) | (2,342) | (2,342)
Balance ending | (2,230) |  | (4,719)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning | (4,631) | (2,200) | (2,200)
Balance ending |  |  | (4,631)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Balance beginning | $ (88) | (142) | (142)
Balance ending |  |  | (88)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Cumulative effect of changes in accounting principles |  |  | (525)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Total [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Cumulative effect of changes in accounting principles |  | $ (525) |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Cumulative effect of changes in accounting principles |  |  | (498)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Cumulative effect of changes in accounting principles |  |  | $ (27)

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