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Loans - Summary of impaired loans by segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 1,076 $ 1,076  
Unpaid Principal Balance 1,076 1,076  
Average Recorded Investment 717 239  
Consumer      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,076 1,076  
Unpaid Principal Balance 1,076 1,076  
Average Recorded Investment 717 239  
Non-performing loans $ 1,100 $ 1,100 $ 0