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Loans and Allowance - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]                        
Loans held for sale $ 7,216       $ 2,929       $ 7,216 $ 2,929    
Allowance for loan losses 75,032       66,037       75,032 66,037 $ 62,453 $ 63,964
Increase in allowance for loan losses                 8,995      
Net charge offs                 148      
Increase in net charge offs                 1,925      
Provision for loan losses 1,800 $ 2,083 $ 2,875 $ 2,385 2,417 $ 1,900 $ 790 $ 550 9,143 5,657 417  
Increase in provision for loan losses                 $ 3,486      
Commercial and farmland                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Percentage of troubled debt restructured loans                 40.00%      
Residential                        
Receivables [Abstract]                        
Allowance for loan losses 13,537       11,755       $ 13,537 11,755 11,139 $ 13,152
Provision for loan losses                 2,391 1,515 $ 310  
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Mortgage loans for which formal foreclosure proceedings are in process $ 2,302       $ 1,530       $ 2,302 $ 1,530