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Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 537,703 | $ 167,256 | $ 196,552 | $ 153,323
Total assets | 9,751,571 | 7,333,791 |  |
Subordinated debentures and notes | 203,637 | 141,258 |  |
Notes payable | 30,000 | 34,286 |  |
Shareholders' equity | 1,078,975 | 867,185 | 603,804 | 548,573
Total liabilities and shareholders' equity | 9,751,571 | 7,333,791 |  |
Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 75,475 | 21,955 | $ 6,369 | $ 9,977
Other assets | 35,108 | 37,905 |  |
Total assets | 1,321,050 | 1,047,614 |  |
Subordinated debentures and notes | 203,637 | 141,258 |  |
Notes payable | 30,000 | 34,286 |  |
Accounts payable and other liabilities | 8,439 | 4,885 |  |
Shareholders' equity | 1,078,974 | 867,185 |  |
Total liabilities and shareholders' equity | 1,321,050 | 1,047,614 |  |
Enterprise Bank and Trust [Member] | Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Investments | 1,200,689 | 977,959 |  |
Nonbank Subsidiaries [Member] | Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Investments | $ 9,778 | $ 9,795 |  |

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