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Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Securities Available for Sale, Due in one year or less, Amortized Cost | $ 0 |
Securities Available for Sale, Due from one year to five years, Amortized Cost | 21,555,000 |
Securities Available for Sale, Due from five years to ten years, Amortized Cost | 14,608,000 |
Securities Available for Sale, Due after ten years, Amortized Cost | 34,378,000 |
Securities Available for Sale, Debt Securities, Amortized Cost | 70,541,000 |
Amortized Cost | 177,915,000 | $ 153,566,000
Securities Available for Sale, Due in one year or less, Fair Value | 0 |
Securities Available for Sale, Due from one year to five years, Fair Value | 20,879,000 |
Securities Available for Sale, Due from five years to ten years, Fair Value | 13,817,000 |
Securities Available for Sale, Due after ten years, Fair Value | 33,825,000 |
Securities Available for Sale, Debt Securities, Fair Value | 68,521,000 |
Securities available for sale | 173,038,716 | $ 151,944,567
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities Available for Sale, Mortgage-backed securities, Amortized Cost | 107,374,000 |
Securities Available for Sale, Mortgage-backed securities, Fair Value | $ 104,518,000 |

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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) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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 sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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