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Parent Company Only Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 153,323 | $ 198,802 | $ 94,157 | $ 100,696
Total assets | 5,289,225 | 4,081,328 |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | 118,105 | 105,540 |  |
Shareholders' equity | 548,573 | 387,098 | 350,829 | 316,241
Total liabilities and shareholders' equity | 5,289,225 | 4,081,328 |  |
Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 9,977 | 52,245 | $ 12,032 | $ 14,532
Other assets | 28,741 | 22,111 |  |
Total assets | 668,703 | 493,985 |  |
Subordinated debentures and notes (net of debt issuance cost of $1,136 and $1,267, respectively) | 118,105 | 105,540 |  |
Accounts payable and other liabilities | 2,025 | 1,347 |  |
Shareholders' equity | 548,573 | 387,098 |  |
Total liabilities and shareholders' equity | 668,703 | 493,985 |  |
Enterprise Bank and Trust [Member] | Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Investments | 623,439 | 416,831 |  |
Nonbank Subsidiaries [Member] | Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Investments | $ 6,546 | $ 2,798 |  |

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