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Condensed Parent Company Financial Statements - Summary of Balance Sheet of Parent Company (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
ASSETS |  |  |
Cash | $ 280,518 | $ 222,043 |
Goodwill | 149,922 | 148,604 | $ 79,749
Total assets | 9,212,357 | 8,565,758 | 7,574,258
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |
Other liabilities | 51,864 | 49,230 |
Junior subordinated debentures | 26,804 | 26,804 |
Stockholders’ equity | 1,067,885 | 1,004,989 | $ 902,789
Total liabilities and stockholders' equity | 9,212,357 | 8,565,758 |
Parent Company [Member] |  |  |
ASSETS |  |  |
Cash | 9,081 | 5,761 |
Investments in subsidiaries | 1,003,017 | 946,311 |
Goodwill | 69,478 | 69,478 |
Core deposit premium | 8,622 | 9,617 |
Dividends receivable | 12,750 | 11,622 |
Other assets | 5,331 | 2,313 |
Total assets | 1,108,279 | 1,045,102 |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |
Other liabilities | 13,590 | 13,309 |
Junior subordinated debentures | 26,804 | 26,804 |
Stockholders’ equity | 1,067,885 | 1,004,989 |
Total liabilities and stockholders' equity | $ 1,108,279 | $ 1,045,102 |

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