Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Total assets	$ 13,054,172	$ 13,537,358
Subordinated debentures and notes	155,433	154,899
Shareholders' equity	1,522,263	1,529,116	$ 1,078,975	$ 867,185
Total liabilities and shareholders' equity	13,054,172	13,537,358
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	99,018	94,760	$ 75,475	$ 21,955
Other assets	30,312	33,847
Total assets	1,699,463	1,711,705
Subordinated debentures and notes	155,433	154,899
Notes payable	17,143	22,857
Accounts payable and other liabilities	4,624	4,833
Shareholders' equity	1,522,263	1,529,116
Total liabilities and shareholders' equity	1,699,463	1,711,705
Enterprise Bank and Trust [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	1,553,657	1,568,796
Nonbank Subsidiaries [Member] | Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Investments	$ 16,476	$ 14,302