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Fair Value - Assets and liabilities measured at fair value on a nonrecurring basis - (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value        
Other Real Estate $ 22,211 $ 31,378 $ 30,554 $ 42,726
Nonrecurring basis | OREO        
Fair Value        
Other Real Estate 22,211 31,378 30,554  
Nonrecurring basis | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate 4,360 12,123 13,355  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | OREO        
Fair Value        
Other Real Estate 22,211 31,378 30,554  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate $ 4,360 $ 12,123 $ 13,355  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | Discounted appraisals | Impaired loans        
Quantitative Information about Level 3 Fair Value Measurements        
Collateral discounts (as a percent) 7.00% 4.00% 6.00%  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | Discounted appraisals | OREO        
Quantitative Information about Level 3 Fair Value Measurements        
Collateral discounts and estimated costs to sell (as a percent) 24.00% 19.00% 16.00%