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Loans and Allowance for Credit Losses - Activity in related party loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loans and Allowance for Credit Losses    
Loans receivable-related parties, beginning $ 167,884 $ 238,236
Additions 30,153 55,657
Repayments (38,204) (126,009)
Additions due to Changes in Related Parties 9,034  
Deletions due to Changes in Related Parties (116,499)  
Loans receivable-related parties, ending $ 52,368 $ 167,884