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Securities - Additional Information (Details) $ in Thousands	Jun. 30, 2018 USD ($) security	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of debt securities in unrealized loss position | security	73		51
Securities pledged for regulatory and legal requirements	$ 231,000		$ 249,000
ASU No. 2016-01 | AOCI
Debt Securities, Available-for-sale [Line Items]
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings		$ (900)	(862)	[1]
ASU No. 2016-01 | Retained Earnings
Debt Securities, Available-for-sale [Line Items]
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings		$ 900	$ 862	[1]
[1] Reclassification due to the adoption of ASU No. 2016-01.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for FHLB debt obligations, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 50
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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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