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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING INCOME                      
Interest on interest-bearing deposits                 $ 31,368 $ 30,403 $ 18,077
OPERATING EXPENSE                      
Other                 44,829 39,887 36,136
Allocated income tax benefit                 (34,683) (33,938) (49,866)
Amortization of stock-based compensation arrangements of subsidiaries                 (1,277) (1,352) (1,180)
Net income $ 35,507 $ 33,368 $ 34,167 $ 31,837 $ 32,725 $ 32,883 $ 30,586 $ 29,620 134,879 125,814 86,439
Parent Company [Member]                      
OPERATING INCOME                      
Dividends from subsidiaries                 77,559 38,326 29,455
Interest on interest-bearing deposits                 1,150 1,151 291
Other                 451 16 3
Total operating income                 79,160 39,493 29,749
OPERATING EXPENSE                      
Interest                 1,965 2,172 2,122
Other                 5,017 698 770
Total operating expense                 6,982 2,870 2,892
Income before taxes                 72,178 36,623 26,857
Allocated income tax benefit                 2,731 3,093 3,295
Income before equity in undistributed earnings of subsidiaries                 74,909 39,716 30,152
Equity in undistributed earnings of subsidiaries                 61,194 87,404 57,429
Amortization of stock-based compensation arrangements of subsidiaries                 (1,224) (1,306) (1,142)
Net income                 $ 134,879 $ 125,814 $ 86,439