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Loans and Allowance for Credit Losses - Related Party Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Beginning balance on January 1 $ 4,152 $ 1,923
New loans 813 1
Transfers   2,500
Repayments (3,233) (272)
Ending balance $ 1,732 $ 4,152