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Loans - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
industry_concentration
Mar. 31, 2018
USD ($)
Financing Receivable, Recorded Investment [Line Items]    
Number of industry segment concentration above threshold limit | industry_concentration 1  
Concentration risk percentage 10.00%  
Loans exposure in oil and gas industry $ 106,800  
Loans with exposure in commercial real estate 3,700  
TDRs that had a payment default that were modified within the previous 12 months $ 713 $ 0
Loans and Finance Receivables | Customer Concentration Risk | Manufacturing Industry    
Financing Receivable, Recorded Investment [Line Items]    
Concentration risk percentage 12.00%