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Mergers and acquisitions - Additional Information (Details)
12 Months Ended
Feb. 08, 2017
USD ($)
Sep. 18, 2015
USD ($)
Dec. 31, 2016
USD ($)
BankingOffice
Branch
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]          
Assets     $ 3,276,881,000 $ 2,899,420,000 $ 2,428,189,000
Loans       5,730,000  
Deposits     2,671,562,000 2,438,474,000  
Business combination, bargain purchase gain       2,794,000  
Business combination, deferred taxes     21,956,000 2,831,000  
Merger and conversion     $ 3,268,000 3,543,000  
Clayton Banks          
Business Acquisition [Line Items]          
Business acquisition, date of acquisition agreement     Feb. 08, 2017    
Assets     $ 1,195,000,000    
Loans     1,052,000,000    
Deposits     $ 920,000,000    
Number of banking offices | BankingOffice     18    
Clayton Banks | Subsequent Event          
Business Acquisition [Line Items]          
Business acquisition, date of acquisition agreement Feb. 08, 2017        
Acquisition value $ 284,200,000        
Northwest Georgia Bank          
Business Acquisition [Line Items]          
Business acquisition, date of acquisition agreement     Apr. 27, 2015    
Business acquisition, effective date of acquisition     Sep. 18, 2015    
Number of branches operated prior to acquisition | Branch     6    
Cash purchase price   $ 1,500,000      
Business combination, bargain purchase gain   2,794,000      
Core deposit intangible asset   $ 4,931,000      
Estimated useful life of intangible assets   10 years      
Business combination, deferred taxes   $ 0      
Deferred tax liability recorded in bargain purchase gain   $ 191,000      
Number of years of deductibility for income tax of the core deposit intangible   15 years      
Merger and conversion     $ 3,268,000 $ 3,543,000