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Related Party Transactions (Details) - USD ($)
12 Months Ended
Jan. 02, 2018
May 08, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transactions            
Percentage of purchase price equal to the price paid by Company’s directors and executive officers, plus expenses and a cost of funds   3.75%        
Total assets     $ 6,371,928,000 $ 3,884,163,000 $ 3,393,133,000  
Total deposits     $ 5,478,075,000 3,231,086,000    
Key loan processing vendors            
Related Party Transactions            
Ownership interest as a percentage     44.23%     30.00%
Fees paid to related party     $ 3,100,000 3,400,000 3,700,000  
Amount accrued for services received     214,000 226,000 253,000  
Law firm            
Related Party Transactions            
Fees paid to related party     3,600,000 3,700,000 3,000,000  
Company owned by Board Member            
Related Party Transactions            
Fees paid to related party     $ 641,000 $ 0 0  
Messrs. Petrie and Rogers | Purchase Agreement | FMBI            
Related Party Transactions            
Purchase price excluding cost of funds   $ 5,400,000        
Amount of cost of funds to be paid for each thirty days after June 30, 2017, proprated to the closing date   $ 16,000        
Period for which cost of fund to be raised by company   30 days        
Purchase price $ 5,500,000          
FMBI            
Related Party Transactions            
Total assets         43,000,000  
Total deposits         $ 36,900,000