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Basis of Accounting and Consolidation (AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |
Total accumulated other comprehensive income, net of tax | $ 1,155 | $ (6,473)
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |
Net unrealized gains on securities available-for-sale | 1,764 | (8,951)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 138 | 166
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities | 0 | 0
Unrealized gain (loss) on available-for-sale securities, tax benefit | (471) | 2,644
Total unrealized gain (loss) on available for sale securities, net of tax | 1,155 | (6,473)
Securities with other-than-temporary impairment losses, tax benefit | 0 | 0
Total securities with other-than-temporary impairment losses, net of tax | 0 | 0
Accumulated other comprehensive income, tax | (471) | 2,644
Total accumulated other comprehensive income, net of tax | $ 1,155 | $ (6,473)

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