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Loans and Allowance - Subsequent Default (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Financing Receivable, Impaired [Line Items]    
Number of Loans | loan 2 5
Recorded Balance | $ $ 75 $ 337
Commercial and farmland    
Financing Receivable, Impaired [Line Items]    
Number of Loans | loan   1
Recorded Balance | $   $ 14
Residential    
Financing Receivable, Impaired [Line Items]    
Number of Loans | loan 2 4
Recorded Balance | $ $ 75 $ 323