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Fair Value - Significant Unobservable Inputs Used in Fair Value Measurements (Details) - Level 3
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurements, Nonrecurring | Impaired loans    
Significant unobservable inputs used in the fair value measurements    
Assets   $ 87
Fair Value Measurements, Recurring | Other liabilities - derivative    
Significant unobservable inputs used in the fair value measurements    
Liabilities $ (4,114) $ (5,439)
Fair Value Measurements, Recurring | Other liabilities - derivative | Discounted cash flow | Weighted Average    
Significant unobservable inputs used in the fair value measurements    
Expected Conversion Rate 1.6298 1.6483
Expected Term 4 years 4 years
Growth Rate (as a percent) 15.00% 15.00%