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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Assets - Beginning balance | $ 10,023 | $ 1,761
Realized gain included in earnings | 158 | 186
Purchases of available-for-sale securities |  | 8,076
Principal redemption | (3,004) |
Assets - Ending balance | 7,177 | 10,023
Liabilities - Beginning balance | 269 | 10
Realized loss included in earnings | (40) | 259
Liabilities - Ending balance |  | 269
Investment Securities [Member] |  |
Assets - Beginning balance | 9,794 | 1,718
Purchases of available-for-sale securities |  | 8,076
Principal redemption | (3,004) |
Assets - Ending balance | 6,790 | 9,794
Mortgage Banking Derivatives [Member] |  |
Assets - Beginning balance | 229 | 43
Realized gain included in earnings | 158 | 186
Assets - Ending balance | 387 | 229
Liabilities - Beginning balance | 269 | 10
Realized loss included in earnings | (40) | 259
Liabilities - Ending balance | $ 309 | $ 269

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