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Fair Value - Significant Unobservable Inputs Used in Fair Value Measurements (Details) - Level 3
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Measurements, Nonrecurring | Impaired loans      
Significant unobservable inputs used in the fair value measurements      
Assets $ 1,368 $ 1,250 $ 1,031
Fair Value, Measurements, Recurring | Other liabilities - derivative      
Significant unobservable inputs used in the fair value measurements      
Liabilities $ (7,926)    
Fair Value, Measurements, Recurring | Other liabilities - derivative | Discounted cash flow | Weighted Average      
Significant unobservable inputs used in the fair value measurements      
Expected Conversion Factor 1.6483    
Expected Term 4 years    
Growth Rate (as a percent) 15.00%