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Investment Securities (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments [Line Items] |  |  |  |
Gross investment gains | $ 56,000 | $ 15,000 | $ 115,000 |
Gross investment loss |  | $ 163,000 |  |
Investment Securities: |  |  |  |
Consolidated investment securities portfolio modified, years |  | 48 months 6 days |  | 44 months 9 days
Proceeds from sales of investment securities — available for sale | $ 937,000 | $ 4,479,000 | $ 8,143,000 |
Book value of securities available for sale and held to maturity |  | $ 110,038,000 |  | $ 117,181,000
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions |  | 233 |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |
Investments [Line Items] |  |  |  |
Portfolio rated |  | 57.00% |  | 57.80%
Standard & Poor's, A Rating [Member] |  |  |  |
Investments [Line Items] |  |  |  |
Portfolio rated |  | 9.70% |  | 9.70%
Maximum [Member] |  |  |  |
Investment Securities: |  |  |  |
Consolidated investment securities portfolio modified, years |  | 60 months |  |
Minimum [Member] |  |  |  |
Investment Securities: |  |  |  |
Consolidated investment securities portfolio modified, years |  | 24 months |  |

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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