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Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]        
Cash $ 196,552 $ 153,323 $ 198,802 $ 94,157
Total assets 5,645,662 5,289,225    
Subordinated debentures and notes (net of debt issuance cost of $1,005 and $1,136, respectively) 118,156 118,105    
Notes payable 2,000 0    
Shareholders' equity 603,804 548,573 387,098 350,829
Total liabilities and shareholders' equity 5,645,662 5,289,225    
Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Cash 6,369 9,977 $ 52,245 $ 12,032
Other assets 30,287 28,741    
Total assets 725,710 668,703    
Subordinated debentures and notes (net of debt issuance cost of $1,005 and $1,136, respectively) 118,156 118,105    
Notes payable 2,000 0    
Accounts payable and other liabilities 1,750 2,025    
Shareholders' equity 603,804 548,573    
Total liabilities and shareholders' equity 725,710 668,703    
Enterprise Bank and Trust [Member] | Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Investments 681,742 623,439    
Nonbank Subsidiaries [Member] | Parent [Member]        
Condensed Financial Statements, Captions [Line Items]        
Investments $ 7,312 $ 6,546