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Other real estate owned - Summary of Other Real Estate Owned (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other Real Estate [Roll Forward]    
Balance at beginning of period $ 18,939 $ 12,643
Transfers from loans 365 1,106
Transfers to premises and equipment (841) 0
Proceeds from sale of other real estate owned (1,442) (716)
Gain (loss) on sale of other real estate owned 175 (7)
Loans provided for sales of other real estate owned 0 (166)
Write-downs and partial liquidations (124) (32)
Balance at end of period $ 17,072 $ 12,828