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Fair Value - Assets and liabilities measured at fair value on a nonrecurring basis - (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Fair Value        
Other Real Estate $ 20,007 $ 25,953 $ 18,316 $ 30,554
Nonrecurring basis | OREO        
Fair Value        
Other Real Estate 20,007 25,953 18,316  
Nonrecurring basis | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate 2,290 2,173 6,611  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | OREO        
Fair Value        
Other Real Estate 20,007 25,953 18,316  
Nonrecurring basis | Significant Unobservable Inputs (Level 3) | Non-acquired Credit Impaired loans        
Fair Value        
Other Real Estate $ 2,290 $ 2,173 $ 6,611  
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% 5.00% 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) 20.00% 20.00% 18.00%