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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 |  |

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