Available-for-Sale Securities - Summary of Maturities of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	$ 24,693	$ 29,234
Available-for-Sale Securities, Fair Value	24,177	28,897
U.S. Government and Federal Agencies
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities Three months or less, Amortized Cost	1,990
Available-for-Sale Securities After one year through five years, Amortized Cost	20,924	22,921
Available-for-Sale Securities, Amortized Cost	22,914	24,911
Available-for-Sale Securities After three months through one year, Amortized Cost		1,990
Available-for-Sale Securities Three months or less, Fair Value	1,987
Available-for-Sale Securities After one year through five years, Fair Value	20,432	22,575
Available-for-Sale Securities, Fair Value	22,419	24,552
Available-for-Sale Securities After three months through one year, Fair Value		1,977
Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-Sale Securities, Amortized Cost	1,779	4,323
Available-for-Sale Securities, Fair Value	$ 1,758	$ 4,345

Available-for-sale securities, debt maturities, after three month through one years amortized cost.

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- Definition

Available-for-sale Securities, debt maturities, after three month through one years fair value.

+ References

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- Definition

Available-for-sale securities, debt maturities three month or less amortized cost.

+ References

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Available-for-sale securities, debt maturities, three month or less fair value.

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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

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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 second through fifth 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.

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Fair value 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 second through fifth 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.

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Amount 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
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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