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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