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Loans and Allowance for Credit Losses - Changes in the credit mark accretable yield (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loans and Allowance for Credit Losses    
Balance at January 1, $ (1,495) $ (2,459)
Accretion 520 964
Balance at December 31, $ (975) $ (1,495)