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Fair Value - Significant Unobservable Inputs Used in Fair Value Measurements (Details) - Level 3
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurements, Nonrecurring | Impaired loans    
Fair value    
Assets $ 402 $ 87
Fair Value Measurements, Recurring | Visa derivative    
Fair value    
Liabilities $ (2,607) $ (5,439)
Fair Value Measurements, Recurring | Visa derivative | Discounted cash flow | Weighted Average    
Fair value    
Expected Conversion Rate 1.6298 1.6483
Expected Term 4 years 4 years
Growth Rate (as a percent) 15.00% 15.00%