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Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]        
Cash $ 2,021,689 $ 537,703 $ 167,256 $ 196,552
Total assets 13,537,358 9,751,571    
Subordinated debentures and notes 154,899 203,637    
Shareholders' equity 1,529,116 1,078,975 867,185 603,804
Total liabilities and shareholders' equity 13,537,358 9,751,571    
Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Cash 94,760 75,475 $ 21,955 $ 6,369
Other assets 33,847 35,108    
Total assets 1,711,705 1,321,050    
Subordinated debentures and notes 154,899 203,637    
Notes payable 22,857 30,000    
Accounts payable and other liabilities 4,833 8,439    
Shareholders' equity 1,529,116 1,078,974    
Total liabilities and shareholders' equity 1,711,705 1,321,050    
Enterprise Bank and Trust [Member] | Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Investments 1,568,796 1,200,689    
Nonbank Subsidiaries [Member] | Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Investments $ 14,302 $ 9,778