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Fair Value - Assets and liabilities measured at fair value on a nonrecurring basis - (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Fair Value        
Other Real Estate $ 22,427 $ 35,042 $ 30,554 $ 42,726
Nonrecurring basis | OREO        
Fair Value        
Other Real Estate 22,427 35,042 30,554  
Nonrecurring basis | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate 3,515 10,079 13,355  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | OREO        
Fair Value        
Other Real Estate 22,427 35,042 30,554  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate $ 3,515 $ 10,079 $ 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) 6.00% 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) 17.00% 18.00% 16.00%