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Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 3,472,152 | $ 996,623 |  |
Loans | 12,900,897 | 14,425,704 |  |
Other assets | 289,332 | 241,578 |  |
Total assets | 22,359,752 | 21,259,143 |  | $ 15,000,000
LIABILITIES |  |  |  |
Long-term debt | 1,724,941 |  |  |
Total liabilities | 19,383,096 | 18,270,219 |  |
Stockholders’ equity: |  |  |  |
Preferred stock | 767 | 767 |  |
Common stock | 1,081 | 1,136 |  |
Surplus | 2,014,076 | 2,117,282 |  |
Accumulated other comprehensive gain (loss): | 901,006 | 848,848 |  |
Total stockholders’ equity | 2,976,656 | 2,988,924 | $ 2,246,434 | $ 2,084,564
Total liabilities and stockholders’ equity | 22,359,752 | 21,259,143 |  |
Parent Company |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 172,083 | 104,068 |  |
Investment securities | 1,648 | 743 |  |
Investments in wholly-owned subsidiaries | 3,165,791 | 3,269,224 |  |
Loans | 471 | 657 |  |
Intangible assets, net | 133 | 133 |  |
Premises and equipment | 25,606 | 27,351 |  |
Other assets | 56,257 | 31,738 |  |
Total assets | 3,421,989 | 3,433,914 |  |
LIABILITIES |  |  |  |
Long-term debt | 406,859 | 413,760 |  |
Other liabilities | 38,474 | 31,230 |  |
Total liabilities | 445,333 | 444,990 |  |
Stockholders’ equity: |  |  |  |
Preferred stock | 767 | 767 |  |
Common stock | 1,081 | 1,136 |  |
Surplus | 2,014,076 | 2,117,282 |  |
Accumulated other comprehensive gain (loss): | 901,006 | 848,848 |  |
Unrealized appreciation on available-for-sale securities, net of income taxes of $21,132 and $7,392 at December 31, 2020 and 2019 respectively | 59,726 | 20,891 |  |
Total stockholders’ equity | 2,976,656 | 2,988,924 |  |
Total liabilities and stockholders’ equity | $ 3,421,989 | $ 3,433,914 |  |

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