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Investment securities - Equity Securities Portfolio (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($)
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Investment Securities |  |
Number of equity securities portfolio consisting of stock of other financial institutions | security | 1 |
Equity investments carried at fair value | $ 110 | $ 140
Fair value of equity portfolio in excess of cost basis | 44 |
Equity Securities |  |
Investment Securities |  |
Equity investments carried at fair value | $ 100 | $ 100

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