Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Total assets	$ 14,518,590	$ 13,054,172
Subordinated debentures and notes	155,984	155,433
Shareholders' equity	1,716,068	1,522,263	$ 1,529,116	$ 1,078,975
Total liabilities and shareholders' equity	14,518,590	13,054,172
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	100,418	99,018	$ 94,760	$ 75,475
Other assets	27,701	30,312
Total assets	1,887,646	1,699,463
Subordinated debentures and notes	155,984	155,433
Notes payable	11,429	17,143
Accounts payable and other liabilities	4,165	4,624
Shareholders' equity	1,716,068	1,522,263
Total liabilities and shareholders' equity	1,887,646	1,699,463
Enterprise Bank and Trust [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	1,748,260	1,553,657
Nonbank Subsidiaries [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 11,267	$ 16,476