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Loans, Allowance for Credit Losses and Impaired Loans - Related Party Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related party    
Commitments to loan additional funds $ 0  
Directors, Principal Officers, and Stockholders    
Related party    
Related party loans receivables 17,900 $ 5,200
Related party loan additions 17,100 120
Related party loan additions acquired in business combination 11,200  
Proceeds from related party loan repayments 3,200 $ 2,200
Retired Directors    
Related party    
Related party loans receivables $ 1,200