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Investment securities - Equity Securities Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) security	Dec. 31, 2018 USD ($)	Dec. 31, 2019 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
Proceeds from sale of equity holdings	$ 279
Gain on sale of equity holdings	29
Equity investments carried at fair value	138		$ 423
Net unrealized gains recognized in AOCI		$ 3
Fair value of equity portfolio in excess of cost basis	15
Common equity securities.
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments carried at fair value	$ 138		$ 423

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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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The amount of other than temporary impairment losses on investments in equity securities which have been recognized in earnings during the period.

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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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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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

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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).

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