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Acquisitions - Additional Information (Details)
 9 Months Ended
Feb. 19, 2016
USD ($)
Branch
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 29,940,000   $ 29,940,000
TFC Holding Company        
Business Acquisition [Line Items]        
Cash consideration $ 86,700,000      
Trust preferred debentures $ 3,300,000      
Number of branches operated | Branch 6      
Goodwill $ 25,900,000      
Fair value of assets acquired 469,900,000      
Cash and cash equivalents 51,600,000      
Interest bearing deposits in other financial institutions 2,300,000      
FHLB stock 2,000,000      
Loans 387,700,000      
Available for sale securities 15,800,000      
Deferred tax asset 4,900,000      
Fixed assets 225,000      
Core deposit intangible assets acquired 1,700,000      
Other assets 3,700,000      
Fair value of liabilities assumed 409,100,000      
Deposits 405,300,000      
Subordinated debentures 3,300,000      
Other liabilites 566,000      
Loans acquired for deterioration of credit quality $ 0      
Non-recurring acquisition related expenses   $ 0 $ 1,700,000  
TFC Holding Company | Maximum        
Business Acquisition [Line Items]        
Fair value adjustment period from acquisition date 1 year