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Securities - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) securities	Jun. 30, 2018 USD ($) securities	Dec. 31, 2017 USD ($)
Schedule Of Equity Securities [Line Items]
Sale of equity securities	$ 0	$ 0
Equity securities, Fair Value	5,025,000	5,025,000	$ 5,006,000
Pledged debt securities, at carrying value	$ 54,226,000	$ 54,226,000	85,985,000
Number of securities which is in unrealized loss position | securities	157	157
Mutual Fund
Schedule Of Equity Securities [Line Items]
Equity securities, Fair Value	$ 5,025,000	$ 5,025,000	$ 5,006,000
Equity securities, Gross Unrealized Gains	$ 100,000	$ 25,000

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- Definition

Number of investment positions in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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- Definition

Amount of equity securities.

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- Definition

Equity securities accumulated gross unrealized gain loss before tax.

+ References

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- Definition

Proceeds from sale of securities equity.

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- Definition

Schedule of equity securities line items.

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- Definition

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

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