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Loans - Summary of impaired loans by segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 750 $ 1,476  
Unpaid Principal Balance 750 1,476 $ 0
Average Recorded Investment 1,213    
Non-performing loans 750 1,476  
Consumer      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 750 1,476  
Unpaid Principal Balance 750 1,476  
Average Recorded Investment 1,213    
Non-performing loans 750,000 1,500  
Consumer      
Financing Receivable, Impaired [Line Items]      
Non-performing loans $ 750 $ 1,476