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Subsequent Events (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 21, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Cash consideration   $ 17,566 $ 0 $ 0
Assets   3,929,090 3,144,360 $ 2,955,994
Deposits   3,072,632 $ 2,484,052  
Citizens First        
Subsequent Event [Line Items]        
Assets   476,000    
Loans   372,000    
Deposits   $ 389,000    
Subsequent Event | Scenario, Forecast | Citizens First        
Subsequent Event [Line Items]        
Shares of common stock issued for acquisition (in shares) 1,700,000.0      
Cash consideration $ 16,000      
Number of the Company's common stock for each share converted (in shares) 31.59      
Aggregate indicated value of acquisition transaction $ 68,200