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Condensed Parent Company Financial Statements - Summary of Balance Sheet of Parent Company (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
ASSETS |  |  |
Cash | $ 216,104 | $ 183,921 |
Securities | 469,995 | 469,833 |
Goodwill | 54,042 | 54,042 | $ 54,042
Total assets | 7,253,156 | 7,018,952 | 6,692,829
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |
Other liabilities | 29,623 | 27,342 |
Junior subordinated debentures | 31,959 | 31,959 |
Stockholders’ equity | 775,629 | 711,094 | $ 655,510
Total liabilities and stockholders' equity | 7,253,156 | 7,018,952 |
Parent Company [Member] |  |  |
ASSETS |  |  |
Cash | 67,917 | 57,537 |
Securities | 8 | 97 |
Investments in subsidiaries | 737,205 | 681,861 |
Goodwill | 450 | 450 |
Dividends receivable | 7,788 | 6,998 |
Other assets | 1,393 | 2,610 |
Total assets | 814,761 | 749,553 |
LIABILITIES AND STOCKHOLDERS' EQUITY |  |  |
Other liabilities | 7,173 | 6,500 |
Junior subordinated debentures | 31,959 | 31,959 |
Stockholders’ equity | 775,629 | 711,094 |
Total liabilities and stockholders' equity | $ 814,761 | $ 749,553 |

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