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Securities - Additional Information (Details) $ in Thousands		Sep. 30, 2019 USD ($) security	Dec. 31, 2018 USD ($) security	Jan. 01, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of debt securities in unrealized loss position | security		14	65
Securities pledged for regulatory and legal requirements		$ 222,300	$ 236,000
ASU No. 2016-01
Debt Securities, Available-for-sale [Line Items]
Reclassification of net unrealized gains on equity securities	[1]			$ 0
ASU No. 2016-01 | Retained Earnings
Debt Securities, Available-for-sale [Line Items]
Reclassification of net unrealized gains on equity securities	[1]			862
ASU No. 2016-01 | AOCI Attributable to Parent
Debt Securities, Available-for-sale [Line Items]
Reclassification of net unrealized gains on equity securities	[1]			$ (862)
[1] Reclassification due to the adoption of ASU No. 2016-01.

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- Definition

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.

+ References

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- Definition

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, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ 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=118939692&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=109249958&loc=SL6224234-111729

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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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