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Investment securities - Equity Securities Portfolio (Details) $ in Thousands	Jun. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Number of equity securities portfolio consisting of stock of other financial institutions | security	1
Equity investments carried at fair value	$ 142	$ 138
Fair value of equity portfolio in excess of cost basis	11
Common equity securities.
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments carried at fair value	$ 142	$ 138

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The amount the fair value of the equity portfolio exceeded the cost basis.

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The number of equity securities portfolio consisting of stock of other financial institutions.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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