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Fair Value - Significant Unobservable Inputs Used in Fair Value Measurements (Details) - Fair Value Measurements, Nonrecurring - Level 3
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Weighted Average    
Fair value    
Expected Term 4 years 4 years
Growth Rate (as a percent) 15.00% 15.00%
Impaired loans    
Fair value    
Assets $ 357 $ 402
Impaired loans | Appraisal Value    
Fair value    
Assets 357 402
Visa derivative | Discounted cash flow    
Fair value    
Liabilities $ (1,839) $ (2,607)
Visa derivative | Discounted cash flow | Weighted Average    
Fair value    
Expected Conversion Rate 1.6298 1.6298