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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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+ References

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