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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING INCOME                      
Interest on interest-bearing deposits                 $ 18,077 $ 7,908 $ 4,265
OPERATING EXPENSE                      
Other                 36,136 32,857 33,972
Allocated income tax benefit/(expense)                 (49,866) (37,263) (35,040)
Amortization of stock-based compensation arrangements of subsidiaries                 (1,180) (1,636) (1,717)
Net income $ 19,497 $ 21,710 $ 23,182 $ 22,050 $ 18,620 $ 17,982 $ 17,493 $ 16,579 86,439 70,674 66,170
Parent Company [Member]                      
OPERATING INCOME                      
Dividends from subsidiaries                 29,455 28,175 26,043
Interest on interest-bearing deposits                 291 160 66
Other                 3 3 2
Total operating income                 29,749 28,338 26,111
OPERATING EXPENSE                      
Interest                 2,122 2,096 1,998
Other                 770 583 628
Total operating expense                 2,892 2,679 2,626
Income before taxes                 26,857 25,659 23,485
Allocated income tax benefit/(expense)                 3,295 1,244 (796)
Income before equity in undistributed earnings of subsidiaries                 30,152 26,903 22,689
Equity in undistributed earnings of subsidiaries                 57,429 44,172 44,653
Amortization of stock-based compensation arrangements of subsidiaries                 (1,142) (401) (1,172)
Net income                 $ 86,439 $ 70,674 $ 66,170