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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Amortized cost and fair values of securities |  |
Due in one year or less, amortized cost | $ 89,175 |
Due in one year or less, fair value | 89,175 |
Total Fair value | 103,921 | $ 93,383
Total Amortized Cost | 103,587 | 92,876
Equity mutual fund [Member] |  |
Amortized cost and fair values of securities |  |
Total Fair value | 0 | 499
Total Amortized Cost |  | 500
Mortgage - backed securities - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 10,593 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 10,925 |
Total Fair value | 10,925 | 12,472
Total Amortized Cost | 10,593 | 11,969
Collateralized mortgage obligations - residential [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 3,819 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 3,821 |
Total Fair value | 3,821 | 4,486
Total Amortized Cost | $ 3,819 | 4,481
SBA-guaranteed loan participation certificates [Member] |  |
Amortized cost and fair values of securities |  |
Total Fair value |  | 10
Total Amortized Cost |  | $ 10

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