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Investment securities - Unrealized and realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investment securities        
Net gains recognized during the period on equity securities $ 14 $ 14 $ 6 $ 14
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 14 $ 14 $ 6 $ 14