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Parent Company Only Condensed Financial Information - Condensed Parent Company Only Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 234,939 | $ 134,129 | $ 114,514 | $ 105,277
Securities - held to maturity | 8,487 | 8,557 |  |
Loans | 3,581,073 | 2,792,108 |  |
Other assets | 41,948 | 32,109 |  |
Total assets | 4,559,779 | 3,499,033 |  |
LIABILITIES AND EQUITY |  |  |  |
Subordinated notes | 48,929 | 48,828 |  |
Junior subordinated debentures | 39,083 | 38,623 |  |
Total liabilities | 3,923,172 | 3,107,335 |  |
Stockholders' equity | 636,607 | 391,698 | 289,345 | 268,038
Total liabilities and stockholders' equity | 4,559,779 | 3,499,033 |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 31,706 | 47,826 | $ 10,222 | $ 21,749
Securities - held to maturity | 8,487 | 8,557 |  |
Loans | 9,912 | 11,046 |  |
Investment in bank subsidiary | 670,908 | 407,050 |  |
Investment in non-bank subsidiaries | 6,396 | 12,650 |  |
Other assets | 3,612 | 4,880 |  |
Total assets | 731,021 | 492,009 |  |
LIABILITIES AND EQUITY |  |  |  |
Subordinated notes | 48,929 | 48,828 |  |
Junior subordinated debentures | 39,083 | 38,623 |  |
Intercompany payables | 318 | 10,169 |  |
Accrued expenses and other liabilities | 6,084 | 2,691 |  |
Total liabilities | 94,414 | 100,311 |  |
Stockholders' equity | 636,607 | 391,698 |  |
Total liabilities and stockholders' equity | $ 731,021 | $ 492,009 |  |

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