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Securities - Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost and fair values of securities |  |
Due in one year or less, amortized cost | $ 96,603 |
Due in one year or less, fair value | 96,603 |
Total Fair value | 112,452 | $ 93,383
Total Amortized Cost | 112,069 | 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 | 11,431 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 11,811 |
Total Fair value | 11,811 | 12,472
Total Amortized Cost | 11,431 | 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 | 4,028 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 4,031 |
Total Fair value | 4,031 | 4,486
Total Amortized Cost | 4,028 | 4,481
SBA-guaranteed loan participation certificates [Member] |  |
Amortized cost and fair values of securities |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 7 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 7 |
Total Fair value | 7 | 10
Total Amortized Cost | $ 7 | $ 10

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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