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Accumulated Other Comprehensive Income, Reclassification of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Less provision for income taxes | $ 941 | $ 483 |
Reclassification adjustment, net of taxes | (14) |  | $ (6)
Unrealized Gains and Losses on Available-for-Sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification adjustment, net of taxes | (14) |  | $ (6)
Unrealized Gains and Losses on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Realized loss on sale of debt securities | (18) | 0 |
Less provision for income taxes | (4) | 0 |
Reclassification adjustment, net of taxes | $ (14) | $ 0 |

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