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Investment securities - Equity Securities Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) security
Investment Securities
Number of equity securities portfolio consisting of stock of other financial institutions | security		1
Proceeds from sale of equity holdings	$ 279
Gain on sale of equity holdings	29
Equity investments carried at fair value	138	$ 140
Fair value of equity portfolio in excess of cost basis		13
Equity Securities
Investment Securities
Equity investments carried at fair value	$ 138	$ 140

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- Definition

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

+ References

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- Definition

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

+ References

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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), classified as current.

+ 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=123594786&loc=SL75136599-209740

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- Definition

Amount of realized gain from sale 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

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- Definition

The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

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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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