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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING INCOME                      
Interest on interest-bearing deposits                 $ 30,403 $ 18,077 $ 7,908
OPERATING EXPENSE                      
Other                 39,887 36,136 32,857
Allocated income tax benefit                 (33,938) (49,866) (37,263)
Amortization of stock-based compensation arrangements of subsidiaries                 (1,352) (1,180) (1,636)
Net income $ 32,725 $ 32,883 $ 30,586 $ 29,620 $ 19,497 $ 21,710 $ 23,182 $ 22,050 125,814 86,439 70,674
Parent Company [Member]                      
OPERATING INCOME                      
Dividends from subsidiaries                 38,326 29,455 28,175
Interest on interest-bearing deposits                 1,151 291 160
Other                 16 3 3
Total operating income                 39,493 29,749 28,338
OPERATING EXPENSE                      
Interest                 2,172 2,122 2,096
Other                 698 770 583
Total operating expense                 2,870 2,892 2,679
Income before taxes                 36,623 26,857 25,659
Allocated income tax benefit                 3,093 3,295 1,244
Income before equity in undistributed earnings of subsidiaries                 39,716 30,152 26,903
Equity in undistributed earnings of subsidiaries                 87,404 57,429 44,172
Amortization of stock-based compensation arrangements of subsidiaries                 (1,306) (1,142) (401)
Net income                 $ 125,814 $ 86,439 $ 70,674